09:00-10:00, Monday, October 14, 2019
Chair: Joo-Youl Huh (Korea University, Korea)
 
 
Corrosion has been one of the big issues in the steel industry. Therefore, steel suppliers have developed various corrosion-resistant materials to prevent and to reduce the corrosion damage, satisfying the requirements from the customers. POSCO as a world top steel maker, has supplied the excellent corrosion-resistant and environmental-friendly steel products in global steel industry. Those steel products can be categorized into three groups of the surface treated steels, corrosion-resistant structural steels, and stainless steels. Surface treated steels with the protective coating layer such as galvanizing or post organic-resin coating have been developed in the various process and technology to enhance high corrosion resistance and useful performance. Corrosion engineering has been also applied to carbon steel structural steels for shipbuilding applications, sour-resistant linepipe steels, weathering steels, and those steels for oil sand slurry pipes. New stainless steel which can not be easily corroded has been developed to be useful in the specific environment with the effective cost to meet the customer needs. Steel makers are continuosly developing new technologies and products to find the solution against the corrosion for the future industry.
 



Se Don Choo
Executive Vice President, POSCO, Korea
 
ACADEMIC BACKGROUND
• 1992: KAIST, Mat Sci. & Eng (Ph. D)
• 1986: KAIST, Mat Sci. & Eng (MS)
• 1984: Seoul National University, Metallurgy (BS)
 
EXPERIENCE
• 2019.1~ : Head of Steel Solution Research Lab.
• 2018.1~2019.1: Head of Steel Solution Marketing Office, POSCO
• 2016.9~2018.1: Head of Steel Business Division Energy and Shipbuilding Materials Marketing Office.
• 2016.2~2016.9: Head of Pohang Research Lab, POSCO
• 2015.3~2016.2: Head of Gwangyang Research Lab (S.V. P)
• 2011.3~2015.3: Gr. Leader, Gwangyang Research Lab
• 2009.3~2011.3: Gr. Leader, Technical Planning Dep.
• 2003.3~2009.3: Leader, Plate Design Team, Marketing Div.
• 1993.12~2003.3: Researcher, POSLAB
 
AWARDS
• 2014: Technical Award, the Korean Institute of Metals and Materials
• 2013: Technical Innovation Award, POSCO
• 2012: Technical Creative Award, POSCO
• 2007: Prize awarded by Minister, Korean Government
 
 
09:00-10:00, Tuesday, October 15, 2019
Chair: Seung Ho Ahn (Hyundai Motor Company, Korea)
 
 



Homero Castaneda-Lopez
Professor, Texas A&M University, USA
 
ABOUT
Castaneda-Lopez received his Ph.D. in materials science and engineering from Penn State University. He is the director of the National Corrosion and Reliability Center of Texas A&M.
 
EDUCATION
• Ph.D. Materials Science and Eng., Penn State University, University Park, PA (1997-2001)
• M.S. Materials Science (Honors), National Autonomous University of Mexico, UNAM (1995-1997)
• B.S. Chemical Metallurgical Engineering (Honors), National Autonomous University of Mexico, UNAM (1990-1994)
 
RESEARCH INTEREST
• Cathodic Protection
• Protective Coatings
• Corrosion Mechanisms
• Batteries
 
 
09:30-10:30, Wednesday, October 16, 2019
Chair: Young Geun Kim (KOGAS, Korea)
 
 
Carbon steels are the earliest, the largest amount and the most widely used basic material in modern industry. The proportion of carbon steel in the total steel output is about 80%. It is widely used in construction, bridge, railway, vehicle, ship, petroleum chemical industry, marine development and various mechanical manufacturing industries. While increasing the production of low alloy high strength steel and alloy steel, the industrial countries in the world pay great attention to improving the quality of carbon steel, expanding the variety and application range. Among them, improving the corrosion resistance of carbon steel is one of the important research contents in improving the quality of carbon steel. Ferrite + pearlite phases is the most common microstructure of carbon steel, in which pearlite with a typical lamellar structure consisting of alternating layers of ferrite and cementite (Fe3C) plays an important role in the mechanical properties of steel. However, the electrical contact between Fe3C phase as the cathode and ferrite phase as the anode in electrolyte solution can cause the galvanic corrosion, which will promote the deterioration of the corrosion resistance of ferrite-pearlite steel. It is believed that the corrosion resistance of ferrite-pearlite steel can be effectively improved by adjusting its microstructure and micro-alloying. The current study focused on improving the corrosion resistance of ferrite-pearlite steels in an acid solution simulating the COT bottom plate environmental by means of cementite spheroidization and alloying with Cu, Sn and Mo to reduce the galvanic effect between cementite and ferrite phases. Two processes of cyclic spheroidizing annealing and quench + high temperature tempering were adopted to realize cementite spheroidization. Immersion test, X-ray diffraction, micro morphology observation, potentio-dynamic polarization, open circuit potential monitoring and electrochemical impedance spectroscopy was utilized. The results show that: 1, with extending the immersion time, the preferential dissolution of the exposed ferrite resulted in a lot of lamellar cementite accumulation on the unspheroidized carbon steel surface, which enhanced the galvanic effect and hence accelerated the corrosion. The promoted anodic dissolution of ferrite phases was controlled by charge transfer process, while the hydrogen evolution reduction occurred on cementite was controlled by the diffusion process. 2, spheroidization and dispersion of cementite can effectively reduce the corrosion acceleration caused by the galvanic effect between ferrite and cementite phases. This can be attributed to the looseness and separation of the spheroidized cementite with the dissolution of the surrounding ferrite, which prevents the increase of the area fraction of cathode to anode. 3, alloying with Cu, Sn and Sn-Mo in the ferrite-pearlite steel can also effectively reduce the corrosion acceleration caused by the galvanic effect between ferrite and cementite phases. Cu precipitates as the nano-sized particles on the steel surface after immersion test, which reduces the galvanic effect between the ferrite and cementite phases. Besides, Sn and Mo should exist as the elementary substance and were uniformly distributed on the steel surface, which can also retard the galvanic corrosion between the ferrite and cementite phases. 4, the spherical dispersion treatment of cementite combining with Cu alloying can further reduce the corrosion acceleration caused by the galvanic effect between ferrite and cementite.
   



Junhua Dong
Professor, Institute of Metal Research, Chinese Academy of Sciences, China
 
Prof. Junhua Dong is currently working in Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS). He is the vice president of the Chinese Society for Corrosion and Protection, and he is also the member of the Standing Committee of the Corrosion Branch (AHD#45) of Transport Research Board (TRB) of the United States. In addition, he is the editorial board member of the “Journal of Corrosion and Protection of China” and “Corrosion Science and Protection Technology” and Materials Protection. He has his expertise in electrochemical corrosion principle of metals in studying and teaching. His primary research aim is to solve various industrial and natural environmental corrosion problems. His research interests has been focused on: study on the evaluation of atmospheric corrosion evolution of low alloy steels; study on developing cost effective weathering steel and marine corrosion resistant steel; the material design of high level nuclear waste containers for the underground geological disposal in China; study on monitoring the marine corrosion of tidal zone and deep sea; the evaluation of concrete corrosion; study on magnesium corrosion and protection by alloying and coating technique; the evaluation of corrosion inhibitors; electrochemical corrosion monitoring for various corrosion environments. He has published more than 120 papers and taught the course of electrochemical corrosion principle of metals to the graduate students for 16 years in his organization.
 
 
11:00-12:00, Wednesday, October 16, 2019
Chair: Young Geun Kim (KOGAS, Korea)
 
 
In future, many countries will face a crisis of water scarcity. According to the report of the Organization for Economic Cooperation & the Development (OECD), nearly half of the worlds’ population will inhabit in areas with severe water stress by 2030. Thus, from a viewpoint of saving fresh water, it is important to conduct research on utilization of seawater in various fields including concrete industry. Actually, in japan, based on the experience of 2011 Great Earthquake, many researches were carried out in order to evaluate utilization of seawater in concrete production and saving fresh water for drinking or for life keeping. JCI (Japan Concrete Institute) are doing research activity from 2013. Some research results are introduced in this presentation. From world-wide literature surveys carried out in this JCI activity, it is concluded that many positive opinions are obtained for concrete performance mixed with seawater with mineral admixture, for example, GGBFS or FA. However, relatively negative opinions are concentrated on OPC used concrete without mineral admixtures. As anticipated, the survey shows that a very large number of standards, papers and opinions are absolutely opposed against the use of seawater. While some standards allow the use of seawater for plain concrete, no standards allow the use of seawater for RC. Further, serious degradation has been confirmed to occur as the result of inappropriate mix proportions, fabrication, construction and seawater use. In this presentation, I hope to discuss with many participants on sea water utilization in concrete production based on the experience in Japanese concrete and corrosion engineering. The overnight approval of seawater use in concrete engineering will not be in the world. Some concrete and corrosion engineer only hopes that the use of seawater will be one of the ways to save freshwater resources particularly in countries with freshwater shortages in near future.
 



Hidenori Hamada
Professor, Kyushu University, Japan
 
Hidenori Hamada is Professor of Department of Civil and Structural Engineering, Faculty of Engineering, Kyushu University. His BS is from Kyushu University in 1984, his MS from Kyushu University in 1986 and his Doctor of Engineering is from Kyushu University in 1998. He spent 20 years (1886-2005) in Governmental Research Institute, as Research Engineer, Senior Research Engineer, Chief of Materials Laboratory, Head of Materials Division in Port and Airport Research Institute (PARI), Independent Administrative Institution, Japan. During this career, he spent one year (1992-1993) in The University of Sheffield, England, U.K. as a Visiting Researcher under Prof. R. N. Swamy. He started his academic career in Kyushu University, as Associate Professor in 2006, and Professor in 2009. His main research area has been corrosion and corrosion prevention of RC and PC structures. Recently, he is studying sea water utilization in concrete production, as mixing water and curing water. He is fellow of JSCE (Japan Society of Civil Engineer), JCI (Japan Concrete Institute), and member of JSMS (Japanese Society of Materials Science) and JSCE (Japan Society of Corrosion Engineering).