Dr Igor Chaves

Dr Igor Chaves

Research Academic

School of Engineering (Civil Engineering)

Engineered for building ideas

Civil Engineer Dr Igor Chaves has a precise focus for his research goals. He wants to build ideas.

As a youth, Igor was engrossed in programs on the Discovery Channel focussed on building large structures which sparked his desire to make his mark on the world and to be a part of something that built things for the community. When it came time for tertiary study, Igor’s exemplary school results left the doors pretty wide open to study anything he desired. “I went to the Federal University of Vicosa (Brazil) to check out what was on offer for an undergraduate degree. I looked at Maths, Physics, Law, Economics and nothing was quite right. So I went over to Architecture because I wanted to design, I wanted to create things, and by chance, a lecturer saw me and said “Before you make the decision, let me put you in touch with a consulting Civil Engineer as he’ll be happy for you to hang around the office and see what they do.”

This chance meeting led to Igor working as a volunteer Construction Engineer for two and a half years while he studied Bachelor of Engineering (Civil). “I went to Uni in the morning, and worked in the afternoon.” For most people, that would be a full schedule: but not Igor. “I was also an indoor rock climbing instructor in the evenings and used to play classical guitar at weddings and theatres over the weekends to help give me a little bit of pocket money,” he grins.

“Studying a Bachelor of Civil Engineering, and being exposed to the construction management as well as the rock climbing made me realise that I don’t actually have to build ‘things’ – I can build ideas and these ideas can be applied by lots of people.”

Before graduating, Igor was head-hunted to work as an industrial researcher for two and a half years whilst being offered the top scholarship in the country to complete a Master of Structural Engineering in Brazil. Then Australia came calling, well, Newcastle in particular. “In 2009 I got a phone call from a guy called Rob Melchers from Australia. He said he’d heard good things about me and had an offer for me. I took up his offer and here I am,” Igor says.

A PhD at the University of Newcastle under Professor Melchers has led to a career as a research academic at UON. Although Igor’s career seems like a series of fortuitous events he’s quick to add that it’s all part of his plan: “It’s all mapped out,” he says with a smile. “Ever since I got into University and I had that click: ‘I’m going to build ideas’ I just drew a career path and followed it. I was very fortunate, because I had mentors that I wished to learn from that I’ve met along the way.”

Rusted on Research

A life-long learner, Igor’s career path has led him to explore rust and corrosion in his current research, and it seems a natural progression. “When I was doing Construction Management I observed that the most complex thing to handle was not the design, but the implementation and operation of that design. Making sure that during that process you guarantee longevity so that when you operate what you built you don’t have deterioration.”

“When I moved into building ideas, the same philosophy applied. We had to come up with formulas for people to use so that when they use it, the risk of that formula giving you a bad result was minimised”.

“I did my masters of Structural Engineering on minimising risk where I undertook prototypes testing with new products and computer analysis. I got a handful of results which took two years to obtain, but then those results were going to be the basis of the standardised design equations that went into the Brazilian construction codes (specifically the Brazilian Standard for Structural Steel Design – NBR 08800 2009). This made me think, ‘how can we generalise this scenario from a handful of results? Can I quantify the risks somehow?’”

“So I started teaching myself about structural reliability analysis which is the same methodology applied by Prof. Melchers’ group here in Newcastle. In fact Rob Melchers wrote the book that I was studying at the time!”

“When Rob called me he said, ‘What do you know about corrosion?’ and I said ‘Squat, I have no clue, I’m a Civil Engineer’ so he said that was good as he wanted someone with practical experience. The science is already established, we don’t reinvent the science. As a civil engineer I don’t care about what caused the corrosion – we’re concerned about what happens to structures over time. We need to quantify the risks of the structure becoming unsafe and killing people.”

Global collaboration

Igor and his team rely on published information from experts, and where that’s not available, they collaborate with world-leaders to get the information they need. “There are a number of colleagues across the globe we’re working with,” he says.

“We’re working alongside scientists and relying on published material – or collaborating with chemists and computer scientists, microbiologists if we don’t have the data or expertise. The key thing is understanding the phenomological side of each of those variables, where it comes from, and finding the experts to collaborate with.”

During his PhD long-term corrosion of steel immersed in marine environments Igor noticed an interesting pattern with welds. “I noticed that steel on welds corrodes faster than non-welds,” Igor explains. “This can lead to catastrophies like massive oil spills, even from a very small hole in one area.”

“Assuming you have the best welder, the best material and the best practice, you will still have microstructural variations in the material itself. You don’t change the chemistry, but you can still change the shape of the crystals and how they pack up. There will be a very small area where there’s different shapes and sizes and that causes the corrosion to accelerate. We’re working on joining without welding, but even with bolting there’s a crevice which can lead to even more problematic scenarios. If you’re going to weld you need to do pre- and post-heat treatment of the welds very well to minimise that problem. Your choices are to minimise the problem or protect the area with mitigation mechanisms.”

“If you consider that risk is the probability of something happening, times the consequence of something happening, the sheer magnitude of such consequences of these failures hugely exacerbates the risk you can consider,” Igor concludes.

Taking academia to industry

Igor often attends International Conferences where major oil companies sent representatives to try and learn from academia in order to forge strong industrial ties. “With their infrastructure, such as North Sea Oil Platforms, it’s a major cost to them if they need to stop work to make repairs. The standard method was to identify a problem, then cut it out to repair – but this leaves the problem in that there are now two welds – susceptible to corrosion. I try to counter-argue in that it’s a short-term solution and that we can help prolong the time between repairs.”

There are three main components you should look at when trying to predict at corrosion: variables in the environment, the material itself and the corrosion mechanism. That’s where Igor’s research focus is honed.

Igor works to convince industries to invest a little in his research – to make massive gains in their bottom line. “Even if they just invest one percent of the cost of a project it can make a high impact in the long-term. Instead of trying to replicate situations in the lab, we focus going out into the real world and getting the empirical evidence for each of the variables and then bringing it into the lab.”

A 2016 Early Career and Innovation Excellence award from the Faculty of Engineering and Built Environment is the latest in a string of awards and accolades this early career researcher is gathering. “I just believe that working hard will attract just rewards,” he shrugs and smiles.

Having been nurtured under a series of mentors, the next leg of Igor’s journey is to inspire Research Higher Degree candidates with three PhD scholarship opportunities at UON. “We’re now even working with the defence industry to find the solutions to their problems. It’s an exciting time to be researching at the University of Newcastle.”

Engineered for building ideas

Civil Engineer Dr Igor Chaves has a precise focus for his research goals. He wants to build ideas.

Read more

Career Summary

Biography

In a general form interest in science, particularly technological and scientific research, was always the main goal in my professional carrier plan. Allied to the need of specialized learning, I understand that academic research can provide a level of knowledge to face the professional challenges of the present world.

I am currently a research academic at the University of Newcastle - Australia, where I have been awarded a PhD for studies in corrosion analysis and prediction. I initiated my studies on steel structures as a research trainee in 2004 at the Federal University of Vicosa - Brazil, where I graduated as a civil engineer in 2007. My interest for engineering scientific research lead me to the EESC University of Sao Paulo, Brazil, and as result of completing a master’s degree in structural engineering in 2008, design guidelines for cold-formed composite steel and concrete beams were added to the Brazilian Standard of Steel Design. Research interests include structural reliability and assessment of infrastructure.

Research Expertise

  • Corrosion and Deterioration Modelling
    Defined as the destruction of a material due to its reaction with the environment, corrosion poses a serious threat to new and existing infrastructure. Understanding such phenomena is detrimental when considering long term prediction of structural service  life.
  • Structural Reliability and Assessment of Structures
    Detecting the role of existent uncertainties in structural projects in terms of risk and structural failure has been proven to be a major step in modern engineering design, assisting adequate allocation of resources and decision making.
  • Numerical and Computational Methods Applied to Structural Engineering
    Once real life applications adopt differential equations for elements of scientific nature, engineering computational methods is a powerful tool for approximating accurate solutions for such complex engineering problems.
  • Experimental Methods and Material Analysis of Structures
    Understanding modern engineering experimentation including design, system calibration, data acquisition, analysis and presentation is a key skill for any academic engineer.
  • Structural Stability and Evaluation of Steel Elements and Composite Systems - Theory and Design
    The key to efficient structural design is the optimization of the mechanics, properties and behaviours behind the materials and shapes of structural elements. Understanding your structure in accordance with the applicable codes of practice a more reliable, efficient and durable structure can be built.

Teaching Expertise
Teaching is a special calling and for the strong hearted, encompassing many values such as: achievement, compassion, creativity, duty, excellence, growth, knowledge, leadership, perseverance, courage and vision. To teach is to reflect to the younger generation such values so that high standard professionals can have a solid moral base in which to conduct their responsibilities towards society. Subjects of Expertise Include:

  • Statics and Engineering Mechanics
    Introduces basic principles of engineering mechanics, emphasising upon the gaining of real understanding of the laws and principles of mechanics and the ability to analyse and solve problems in mechanics.
  • Engineering Computations and Probability
    Understanding and implementing algorithms for a variety of problems where approximate solutions are obtained, the subject introduces the principles of engineering computations and probabilistic statistics, providing solid foundation for later year courses in water, structural and geotechnical engineering.
  • Theory of Structures
    Covers advanced methods of analysis for structural systems, emphasising principles of structural analysis of isostatic and hyperstatic elements, plastic design theory and bounding problems. Providing solid theoretical understanding and capability to solve a vast range of structural design challenges.
  • Steel Design
    Capacitate students with in-depth skills of assimilation of data, determination of load combinations and design of steel structures and elements by applying knowledge from previous courses, developing necessary professional judgement to produce articulate and concise documents which convey evidence-based understanding of structural steel design concepts.
  • Reinforced Concrete Design
    State of the art in-depth training of structural design skills for reinforced concrete and pre-stressed concrete members. Topics include efficient structural design optimisation of the mechanics, properties and behaviour behind the reinforced concrete material and shapes of structural elements in accordance with the applicable codes of practice.

Administrative Expertise
The combination of theory with practical knowledge makes a firm ground for the practice of engineering over a range of problems. The application of planning, designing, constructing, maintaining and operating infrastructure while protecting the public and environmental health were some of my responsibilities during the period of two years in which I was employed by a construction execution and consulting firm. Responsible for managing and coordinating several local and interstate sites, administrative skills were essential to ensure efficient, effective, secure and professional execution of the company's infrastructure projects.

Duties involved: Technical supervision of all structure construction; Operative oversight of standard of quality required by the Standards and Norms in regards to quality control; Operative oversight of standard of quality for all aggregates and reinforcement steel purchases; Quality control of all sites temporary installments and supervision of working force; Operative supervision of all exterior finishing work, including insulation, cladding and roofing; Maintain daily records of each construction site and report back to office; Gather periodic photographic records of each construction stage and report to office; Development of several small town urban development plans; Assist in overall project legal aspects, design, budgeting, drawing and execution.

Collaborations

  • Structural Engineering Department - Federal University of Vicosa, Brazil
  • SET School of Engineering - University of Sao Paulo, Brazil
  • StellTech BR - High Performance Light Structures, Brazil
  • A&R Engineering Consulting Ltd, Brazil
  • AMOG Consulting, Australia
  • Barker Harle Consulting, Australia
  • Vinsi Partners Consulting, Australia
  • Lindsay Dynan Consulting, Australia
  • Pacific Testing Pty Ltd, Australia
  • China Shipbuilding Industry Corporation, China
  • Luoyang Ship Material Research Institute, China

Qualifications

  • PhD (Civil Surveying & Environmental Engineering), University of Newcastle
  • Bachelor of Engineering (Civil), Federal University of Vicosa - Brazil
  • Master of Engineering (Structural), University of Sao Paulo

Keywords

  • Civil Engineering
  • Corrosion Engineering
  • Engineering Computations
  • Probabilistic Modelling
  • Reliability and Risk Assessment
  • Structural Engineering

Languages

  • English (Fluent)
  • Portuguese (Fluent)
  • Spanish (Fluent)

Fields of Research

Code Description Percentage
090506 Structural Engineering 75
091207 Metals and Alloy Materials 15
091507 Risk Engineering (excl. Earthquake Engineering) 10

Professional Experience

UON Appointment

Title Organisation / Department
Research Academic University of Newcastle
School of Engineering
Australia

Academic appointment

Dates Title Organisation / Department
1/11/2013 -  Councillor Australasian Corrosion Association
Australia
1/04/2013 - 31/12/2013 Research Associate The University of Newcastle
School of Engineering
Australia
3/10/2012 - 31/03/2013 Research Assistant The University of Newcastle
School of Engineering
Australia
13/07/2009 - 13/07/2012 Casual Academic The University of Newcastle
School of Engineering
Australia
10/01/2005 - 15/12/2006 Academic Trainee Program University of Vicosa
Brazil
10/01/2005 - 15/12/2006 Academic Trainee Program University of Vicosa
Brazil
10/01/2005 - 15/12/2005 Academic Trainee Program University of Vicosa
Brazil

Membership

Dates Title Organisation / Department
1/01/2012 - 31/12/2013 Membership - Australasian Corrosion Association - Welding, Joining & Corrosion Technical Group Australasian Corrosion Association - Welding, Joining & Corrosion Technical Group
Australia
1/01/2010 -  Membership - The International Society of Offshore and Polar Engineering The International Society of Offshore and Polar Engineering
Australia
1/01/2009 -  Membership - Australasian Corrosion Association - Newcastle Branch Australasian Corrosion Association - Newcastle Branch
Australia

Professional appointment

Dates Title Organisation / Department
10/07/2008 - 10/07/2009 Industrial Researcher ALUSTEEL Engineering Solutions and Consulting Ltd.
United States
1/01/2007 - 1/01/2009 PG - Scholarship University of Sao Paulo
Structural Engineering Department
Brazil
1/03/2005 - 1/07/2005 Structural Engineer Trainee University of Vicosa
Civil Engineering Department
Brazil
1/07/2004 - 1/08/2004 Civil Construction Trainee University of Vicosa
Civil Engineering Department
Brazil
1/04/2004 - 1/12/2004 Structural Engineer Trainee University of Vicosa
Civil Engineering Department
Brazil

Awards

Research Award

Year Award
2016 Early Career Research & Innovation Excellence Award
Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
2016 Brian Cherry International Travel Award
Australasian Corrosion Association
2012 Marshall Fordham Research Paper Award
Australasian Corrosion Association
2011 Young Corrosion Professional Award
Australasian Corrosion Association
2011 3 Minute Thesis Faculty Competition - Winner
Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Teaching Award

Year Award
2015 Excellence in Teaching and Learning
Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Invitations

Distinguished Visitor

Year Title / Rationale
2015 International Research Collaboration on Corrosion Testing and Evaluation
China Shipbuilding Industry Corporation has approved funding for both collaborative research and PhD programs with internationally recognised academic research groups such as CIPAR - The University of Newcastle. Dr Chaves was personally invited as part of their headhunting program. All expenses paid.
2015 UON c50 Parliament House Celebration
PVC Nominated as one of the 5 Faculty’s representatives to interact with the Minister for Education and Training, the Hon. Simon Birmingham and Shadow Minister for Higher Education, the Hon. Kim Carr and senior alumni based in Canberra, and to demonstrate the University’s academic strengths.

Panel Participant

Year Title / Rationale
2013 3 Minute Thesis - Faculty of Engineering and Built Environment
Organisation: University of Newcastle Description: Judge Research Higher Degree student's ability to explain their research to an intelligent but non-specialist audience in three minutes.

Speaker

Year Title / Rationale
2015 FEBE Awards for Excellence in Teaching and Learning Showcase
The showcase features presentations from the 2015 winners of the Faculty's Awards for Excellence in Teaching and Learning, sharing some of their innovative teaching practices and their strategies for engaging and inspiring students.
2013 Science and Engineering Challenge – Central Coast, NSW
Organisation: The University of Newcastle Description: Provide a broad overview of the University of Newcastle research output along with specific overview of field of expertise, engaging technical and non-technical specialist audience, encouraging rural communities to tackle science and engineering challenges.
2012 Corrosion and Risk Management – ACA 2012 Newcastle Road Show Seminars
Provide a broad overview of corrosion related issues in which Industry must deal with on a daily basis. Where content is not highly technical and suitable for a technical level audience. Focus of presentation was in long term risk management of localized corrosion in marine pipelines.

Teaching

Code Course Role Duration
CIVL3160 Reinforced Concrete Design
Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
Covers the structural design of reinforced concrete and prestressed concrete members. Topics include the structural design of reinforced concrete slabs (including two way slabs and flat plates), beams, columns and footings; prestressed concrete beam.
Course Coordinator 28/07/2014 - 4/11/2016
CIVL2240 Civil Engineering Materials
University of Newcastle - Faculty of Engineering & Built Environment
Introduces the important physical and chemical properties of materials that are commonly used in civil engineering.
Course Coordinator 1/01/2016 - 4/11/2016
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Journal article (11 outputs)

Year Citation Altmetrics Link
2016 Chaves IA, 'Long-Term Quantification of Structural Weld Capacity Loss Due to Localised Corrosion', Innovations in Corrosion and Materials Science, 6 40-48 (2016) [C1]
DOI 10.2174/2352094905666151030210521
2016 Melchers RE, Chaves IA, Jeffrey R, 'A conceptual model for the interaction between carbon content and manganese sulphide inclusions in the short-term seawater corrosion of low carbon steel', Metals, 6 (2016) [C1]

© 2016 by the authors; licensee MDPI, Basel, Switzerland.The critical role of manganese sulphide (MnS) inclusions for the initiation of the short-term growth of pitting or locali... [more]

© 2016 by the authors; licensee MDPI, Basel, Switzerland.The critical role of manganese sulphide (MnS) inclusions for the initiation of the short-term growth of pitting or localized corrosion of low carbon steels has long been recognized. Classical results show that pitting probability and pitting severity increases with increased sulphide concentration for low carbon steels as a result of magnesium sulphides acting as local cathodes for initiating pitting corrosion. However, the iron carbides (cementite) in steels can also act as local cathodes for initiation of pitting corrosion. Herein it is proposed that there is competition between pits for cathodic area and that this will determine the severity of pitting and general corrosion observed in extended exposures. Preliminary experimental data for immersion exposures of up to 56 days in natural seawater of three low carbon steels show, contrary to conventional wisdom, greater pit depths for the steels with lower S content. However, the pit depth results are consistent with lower C/S ratios. This is considered to support the concept of cathodic competition between C and S. It is proposed that this offers explanations for a number of other phenomena, including the thus far unexplained apparently higher reactivity of some MnS inclusions.

DOI 10.3390/met6060132
Co-authors Rob Melchers, Robert Jeffrey
2016 Chaves IA, Melchers RE, Peng L, Stewart MG, 'Probabilistic remaining life estimation for deteriorating steel marine infrastructure under global warming and nutrient pollution', Ocean Engineering, 126 129-137 (2016) [C1]

© 2016 Elsevier LtdThe longer-term serviceability and structural safety of steel infrastructure exposed to seawater conditions may be affected by global warming and by seawater n... [more]

© 2016 Elsevier LtdThe longer-term serviceability and structural safety of steel infrastructure exposed to seawater conditions may be affected by global warming and by seawater nutrient pollution. These may affect abiotic and biotic (microbial) corrosion. A model for long-term corrosion is developed from data obtained from steel piling exposed for 33 years in a seawater harbour. The effects on corrosion losses on the structural reliability of steel sheet piling as used in harbours world-wide were investigated as a function of seawater temperature rise from global warming and of seawater nutrient pollution. The results show that structural reliability is more sensitive to likely nutrient pollution than to predicted increases in seawater temperature, noting also that global warming also could increase nutrient pollution from anthropological sources.

DOI 10.1016/j.oceaneng.2016.09.013
Co-authors Mark Stewart, Rob Melchers
2016 Melchers RE, Chaves IA, 'A comparative study of chlorides and longer-term reinforcement corrosion', Materials and Corrosion, (2016)

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.High concentrations of chlorides in reinforced concretes usually are held responsible for reinforcement corrosion. However, this... [more]

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.High concentrations of chlorides in reinforced concretes usually are held responsible for reinforcement corrosion. However, this conflicts with many practical examples of actual concrete structures that show little reinforcement corrosion even with very high chloride concentrations. Herein a series of tests is described for reinforced concrete specimens made with fresh water, seawater, and with seawater with additional sodium chloride and exposed for 10years in a moisture-rich environment. All concretes retained concrete pH values well above 9, and particularly for dense high strength concretes, pH around 12. The overall amount of reinforcement corrosion was zero or almost negligible, irrespective of concrete mix proportions or concrete chloride content. These results are in strong contrast with significant corrosion reported in 1959 after only 2-3years exposure in a parallel experiment. The difference is attributed to poor compaction of those concretes inhibiting their inability to maintain sufficiently alkaline conditions and thus protection of the reinforcing bars. Overall the present controlled experiments support practical experience that reinforced concrete structures, properly made, can survive for long periods of time in chloride-rich environments without the occurrence of serious reinforcement corrosion.

DOI 10.1002/maco.201609310
Co-authors Rob Melchers
2015 Chaves IA, Jeffrey R, Melchers RE, 'Technical note: Rust removal from steel coupons after short-term marine immersion', Corrosion, 71 811-818 (2015) [C1]

© 2015, NACE International.The quantification of mass loss, surface topography, depth of pitting, and localized corrosion for steels subject to marine corrosion requires the remo... [more]

© 2015, NACE International.The quantification of mass loss, surface topography, depth of pitting, and localized corrosion for steels subject to marine corrosion requires the removal of rusts, preferably without causing additional mass loss, pitting, or other damage. Conventional procedures using inhibited hydrochloric acid or Clarke's solution are shown to remove short-term marine rusts but also to cause new corrosion including pitting and related rust products. Both increase with longer exposure to the cleaning solutions. Water washing with soft water left calcareous materials on the metal surface. Ultrasonic removal did not cause additional corrosion but was effective only for very light rusts. Although relatively slow, electrolytic cleaning (electrolysis) produced clean surfaces without new corrosion.

DOI 10.5006/1649
Citations Scopus - 2Web of Science - 1
Co-authors Rob Melchers, Robert Jeffrey
2014 Chaves IA, Melchers RE, 'Extreme value analysis for assessing structural reliability of welded offshore steel structures', Structural Safety, 50 9-15 (2014) [C1]

Natural deterioration of mild steel exposed to marine environment compromises the long-term integrity, serviceability and safety of new and existing infrastructure and increases t... [more]

Natural deterioration of mild steel exposed to marine environment compromises the long-term integrity, serviceability and safety of new and existing infrastructure and increases the risk of structural failure. Welded structures are known to be prone to even higher risks as a result of adverse effects of pitting corrosion in weld-heated areas. A bi-modal model has been shown recently to be a better description for the long-term development of the maximum depth of pits. Also, the statistics of pit depth have been shown to be better represented, for long term exposures, by the Frechet extreme value distribution. Both new developments present challenges for structural reliability analysis. Herein a linearization is used to represent long-term development of pit depth. It is shown that data for maximum pit depths can be separated into those with Gumbel statistics and those for which a Frechet distribution is more appropriate. An example is given for the reliability analysis of a welded pipeline subjected to localized corrosion. The effect of random variable uncertainty is assessed using a sensitivity study. Results show the considerable influence on the probability of failure of pit diameter and the parameters describing the pitting corrosion model. © 2014 Elsevier Ltd.

DOI 10.1016/j.strusafe.2014.03.007
Citations Scopus - 7Web of Science - 3
Co-authors Rob Melchers
2014 Chaves IA, Melchers RE, 'External Corrosion of Carbon Steel Pipeline Weld Zones', INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING, 24 68-74 (2014) [C1]
Citations Web of Science - 1
Co-authors Rob Melchers
2013 Chaves IA, Melchers RE, 'Long term localised corrosion of marine steel piling welds', Corrosion Engineering Science and Technology, 48 469-474 (2013) [C1]

Localised or pitting corrosion can be detrimental for steel pipes and containment structures, since wall perforation may cause system failure. Herein maximum pit depth quantificat... [more]

Localised or pitting corrosion can be detrimental for steel pipes and containment structures, since wall perforation may cause system failure. Herein maximum pit depth quantification and its development with time are considered for samples taken from longitudinal welds on 33-year-old tubulars exposed in Newcastle Harbour. Relationships between pit depth and material metallurgy and corrosion properties were investigated by means of standard macro-etching, rest potential and zero resistance ammetry techniques. It is considered that the observed results are the result of the lack of homogeneity at the corrosion interface caused by differences in grain size, grain structure and the potential for pitting to occur preferentially along boundaries. The results are compared to measurements for longitudinal welds obtained previously on samples of API X56 Spec 5L pipe exposed in similar waters for up to 3?5 years, showing a reasonable degree of consistency between the two sets of data. The reasons for this are discussed. © 2013 Institute of Materials, Minerals and Mining.

DOI 10.1179/1743278212Y.0000000073
Citations Scopus - 6Web of Science - 4
Co-authors Rob Melchers
2011 Chaves IA, Melchers RE, 'Pitting corrosion in pipeline steel weld zones', Corrosion Science, 53 4026-4032 (2011) [C1]
DOI 10.1016/j.corsci.2011.08.005
Citations Scopus - 47Web of Science - 29
Co-authors Rob Melchers
2010 Chaves IA, 'Reliability Based Evaluation of Design Guidelines for Cold-Formed Steel-Concrete Composite Beams', Journal of the Brazilian Society of Mec. Sci. Eng., 32 442-449 (2010) [C1]
2010 Chaves IA, 'Composite Steel and Concrete Beam Constituted of Filled Cold-Formed Section', Caderno de Engenharia de Estruturas, 12 79-96 (2010) [C1]
Show 8 more journal articles

Conference (15 outputs)

Year Citation Altmetrics Link
2016 Melchers R, Chaves IA, Lotfollahi Yaghin A, 'Studies of Iter-link Cyclic Wear of Axially Loaded Mooring Chains', Proceedings of the Twelfth (2016) Pacific-Asia Offshore Mechanics Symposium (2016) [E1]
Co-authors Rob Melchers
2016 Chaves IA, Melchers RE, 'Predicting Long Term Mild-Steel Weld Capacity Loss due to Climate Change Influenced Marine Corrosion', IIW 2016 Proceedings (2016) [E1]
Co-authors Rob Melchers
2015 Pearce D, Chaves IA, 'Weld corrosion - An overview', Australasian Corrosion Association Annual Conference: Corrosion and Prevention 2015, ACA 2015 (2015) [E1]

Severe localized corrosion has long been considered the main cause for containment loss of steel assets such as pipes and tanks, particularly as caused by pitting corrosion on or ... [more]

Severe localized corrosion has long been considered the main cause for containment loss of steel assets such as pipes and tanks, particularly as caused by pitting corrosion on or around weld zones. The weld and heat affected zones for welds in steel structures are known for their higher rate of localized corrosion but there is still some controversy about the specific mechanics causing this phenomenon. This paper overviews the weld corrosion literature that has considered the possible mechanisms involved and the associated material and environmental conditions. Experimental observations are then presented on the metallographic analysis of five separate grades of low-carbon steel. The possibility is examined whether there is a likelihood of greater pit depths being associated with the weld and heat affected zones and whether they can be considered the result of the presence and influence of macro-galvanic cells within the steel matrix. Also, the possibility of localized corrosion being the result of thermal microstructural gradients produced during the welding process is discussed.

2015 Chaves IA, Wilson LJ, Melchers RE, 'Influence of climate change on long-term marine corrosion prediction', Australasian Corrosion Association Annual Conference: Corrosion and Prevention 2015, ACA 2015 (2015) [E1]

Increasingly climate change, including the possible rise of seawater surface temperatures is causing some concern regarding the integrity of commercial and industrial structures i... [more]

Increasingly climate change, including the possible rise of seawater surface temperatures is causing some concern regarding the integrity of commercial and industrial structures in marine exposed environments. Structural integrity (serviceability and safety) may be compromised by the increased rates of corrosion reactions caused by increased average temperatures. Immersed structural systems also may be prone to microbiologically influenced corrosion. In this paper, three different extrapolation techniques are used to model expected corrosion loss. They are based on the same set of short-term empirical mass loss data for 1 year exposures. The results are compared with mass loss data obtained from steel piling exposed for 33 years. It is shown that the extrapolations from short term data can be very significantly in error compared with actual observations and with better modelling approaches. The effects of temperature increase and of increased microbiological influences are considered as part of the investigation.

Co-authors Rob Melchers
2015 Chaves IA, Melchers RE, 'Variability in Long-Term Corrosion of Mild Steel Tubular Sheet Piling', Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference (2015) [E1]
Co-authors Rob Melchers
2014 Melchers RE, Chaves IA, 'New results for the corrosion of reinforcement in marine environments', Annual Conference of the Australasian Corrosion Association 2014: Corrosion and Prevention 2014 (2014) [E1]

The apparently premature corrosion of steel reinforcement in reinforced concrete structures exposed to marine environments continues to be a matter of concern in practice despite ... [more]

The apparently premature corrosion of steel reinforcement in reinforced concrete structures exposed to marine environments continues to be a matter of concern in practice despite decades of research effort and much research funding expenditure and despite much practical experience. Herein results are reported of a long-term (10 year) study of the influence of alkalis on the corrosion initiation and progression of 6mm diam. reinforcing bars centrally embedded in 40x40x160mm concrete specimens. These were made with seawater as mixing water and with a variety of mix proportions including some with added alkalis. All were equally well compacted by vibration. After 10 years continuous exposure in a fog-room only a limited amount of corrosion initiation was observed. These results are in stark contrast with those reported in the famous paper by Shalon & Raphael (1959) who found serious corrosion of reinforcement after only 1-2 years exposure for all mixes. It is shown herein that the corrosion loss trends in those tests are similar to those of steel exposed directly to seawater. This indicates that in the 1959 tests the concrete provided little protection against reinforcement corrosion. The reasons for this are considered herein and the practical implications discussed.

Co-authors Rob Melchers
2014 Chaves IA, Jeffrey R, Melchers RE, 'The effect of cleaning procedures on corrosion coupon surface topography', Australasian Corrosion Association (2014) [E1]
Co-authors Rob Melchers, Robert Jeffrey
2014 Melchers RE, Pape TM, Chaves IA, 'The long-term durability of reinforced concrete structures exposed to aggressive marine environments', Proceedings of the First International Conference on Infrastructure Failures and Consequences (2014) [E1]
Co-authors Rob Melchers
2013 Chaves IA, Melchers RE, 'Reliability Based Evaluation Of Commonly Applied Corrosion Mitigation Techniques', Corrosion and Prevention 2013 Proceedings (2013) [E1]
Co-authors Rob Melchers
2013 Chaves IA, Melchers RE, 'Probabilistic pitting corrosion risk assessment of welded offshore steel pipelines', Proceedings of the Twenty-third International Offshore and Polar Engineering Conference (2013) [E1]
Co-authors Rob Melchers
2013 Chaves IA, Melchers RE, 'Reliability analysis of steel pipeline welds subjected to long-term seawater exposure', From Materials to Structures: Advancement through Innovation (2013) [E1]
Co-authors Rob Melchers
2012 Chaves IA, Melchers RE, 'Reliability analysis of long term pitting corrosion of welded marine steel pipelines', Corrosion Management for a Sustainable World: Transport, Energy, Mining, Life Extension and Modelling (2012) [E1]
Co-authors Rob Melchers
2012 Chaves IA, Melchers RE, 'External corrosion of carbon steel pipeline weld zones', Proceedings of the 22nd International Ocean and Polar Engineering Conference (2012) [E1]
Co-authors Rob Melchers
2011 Chaves IA, Melchers RE, 'Long-term marine corrosion of welds on steel piling', 18th International Corrosion Congress 2011 (2011) [E1]
Co-authors Rob Melchers
2010 Chaves IA, Melchers RE, Fontaine E, 'A field investigation of pitting corrosion of welded pipeline steels', Proceedings of the ACA Conference: Corrosion and Prevention 2010 (2010) [E1]
Co-authors Rob Melchers
Show 12 more conferences

Thesis / Dissertation (2 outputs)

Year Citation Altmetrics Link
2013 Chaves IA, Development of Behaviour Models for Pitting Corrosion of Mild Steel Pipeline Welds in Marine Environment, The University of Newcastle (2013)
2009 Chaves IA, Composite Steel and Concrete Beam Constituted by filled Cold-Formed Steel Section, The University of Sao Paulo - EESC (2009)
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Grants and Funding

Summary

Number of grants 6
Total funding $462,752

Click on a grant title below to expand the full details for that specific grant.


20172 grants / $431,500

Microbiological and abiotic marine corrosion of steel in particulate media$423,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Professor Robert Melchers, Doctor Igor Chaves, Associate Professor Bobby Kannan Mathan
Scheme Discovery Projects
Role Investigator
Funding Start 2017
Funding Finish 2019
GNo G1600293
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Brian Cherry International Travel Award$8,500

Funding body: Australasian Corrosion Association

Funding body Australasian Corrosion Association
Project Team

Dr. Igor Chaves

Scheme Brian Cherry International Travel Grant
Role Lead
Funding Start 2017
Funding Finish 2017
GNo
Type Of Funding International - Competitive
Category 3IFA
UON N

20163 grants / $29,752

Accelerated Corrosion Trials of Metal Foams$18,460

Funding body: Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Funding body Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
Project Team

Dr. Igor Chaves, Ass. Prof. Thomas Fiedler

Scheme FEBE Strategic Pilot Grant
Role Lead
Funding Start 2016
Funding Finish 2016
GNo
Type Of Funding Internal
Category INTE
UON N

Improved FEBE Optical Bright Light Microscopy Research Capability$9,792

Funding body: Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Funding body Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
Project Team

Dr. Igor Chaves, Dr. Michele Spadani, Prof. Robert Melchers

Scheme FEBE Equipment Grant
Role Lead
Funding Start 2016
Funding Finish 2016
GNo
Type Of Funding Internal
Category INTE
UON N

The 69th IIW Annual Assembly and International Conference, Melbourne AUS, 10-15 July 2016$1,500

Funding body: Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Funding body Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
Project Team

Dr Igor Chaves

Scheme Faculty Conference Travel Grant
Role Lead
Funding Start 2016
Funding Finish 2016
GNo
Type Of Funding Internal
Category INTE
UON N

20151 grants / $1,500

The 25th International Offshore and Polar Engineering Conference, Hawaii USA, 21-26 June 2015$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Igor Chaves
Scheme Travel Grant
Role Lead
Funding Start 2015
Funding Finish 2015
GNo G1500527
Type Of Funding Internal
Category INTE
UON Y
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Research Supervision

Number of supervisions

Completed0
Current1

Total current UON EFTSL

PhD0.2

Current Supervision

Commenced Level of Study Research Title / Program / Supervisor Type
2015 PhD Long-term Corrosion of Steel Structures in Marine Environment
PhD (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle
Co-Supervisor
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News

PhD scholarship - Life and Safety of New and Existing Defence Force Assets

November 22, 2016

A PhD scholarship is available for a student to investigate life and safety of new and existing Defence Force assets under the supervision of Dr Igor Chaves.

Dr Igor Chaves

Position

Research Academic
Centre for Infrastructure Performance and Reliability
School of Engineering
Faculty of Engineering and Built Environment

Focus area

Civil Engineering

Contact Details

Email igor.chaves@newcastle.edu.au
Phone (02) 4921 2006
Fax (02) 4921 6991

Office

Room ES 314
Building Engineering Science - ES
Location University Drive Callaghan, NSW 2308 Australia
University Drive
Callaghan, NSW 2308
Australia
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