U.S.-Korea Cooperative Research on the Effects of Hydrogen Upon the Passivating Films on Iron and Nickel

这项建议要求允许明尼苏达大学腐蚀研究中心教授兼主任Richard A.Oriani博士与韩国高等科学技术学院(KAIST)材料科学与工程系Su-Il Pyun博士开展为期24个月的合作研究计划，研究氢对铁和镍表面钝化膜的影响。这项研究将集中在三个具体的任务上，即(1)测定钝化氧化膜中氢的迁移率，(2)氢对钝化膜的离子和电子性质的影响，(3)氢对钝化膜点蚀特性的影响。铁和镍物体的表面通常由钝化氧化膜的表面层保护，使其免受腐蚀。在本项目中，合作者将研究金属上钝化氧化层中的氢是如何表现的，以及它是如何改变它们的性质的。当在酸性介质中发生自由腐蚀时，似乎涉及到氢在钝化层中的传输，因为氢既存在于金属中，也存在于水相中。本项目将主要研究在酸性介质中氢在自由腐蚀和应力腐蚀破裂中的迁移动力学和机理，但该研究将有助于对金属的应力腐蚀破裂和腐蚀疲劳的理解。因此，这项研究可能在许多环境中有重要的应用，包括裂变和聚变核反应堆的热交换器的腐蚀。美国和韩国的合作者都是备受尊敬的科学家，他们有成功合作的记录。该项目与美韩合作科学计划的目标相关，该计划旨在通过交流科学信息、想法、技能和技术以及通过在互利问题上的合作来提高美国和韩国科学家和工程师之间的合作水平。该项目将为奥里亚尼博士在美国国家科学基金会资助下的研究增加一个国际合作层面。DMR-8714547。

This proposal requests funds to permit Dr. Richard A. Oriani, Professor and Director, Corrosion Research Center, University of Minnesota, to pursue with Dr. Su-Il Pyun, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), for a period of 24 months, a program of cooperative research on the effects of hydrogen on passivating films on iron and nickel. The research will focus on three specific tasks, namely, (1) the determination of mobility of hydrogen in passivating oxide films, (2) the effects of hydrogen on the ionic and electronic properties of passivating films, and (3) the effect of hydrogen on the pitting characteristics of passivating films. The surface of iron and nickel objects often is protected from corrosion by surface layers of passivating oxide films. In the present project, the collaborators will study how hydrogen within passivating oxide layers on metals behaves and how it modifies their properties. The transport of hydrogen across a passivating layer appears to be involved whenever free corrosion takes place in an acid medium because hydrogen is found both within the metal and in the aqueous phase. This project will deal primarily with the kinetics and mechanism of hydrogen transport in free corrosion and stress corrosion cracking in acid media, but the research will contribute to an understanding of stress corrosion cracking and corrosion fatigue of metals. Thus, the research may have important applications in many settings, including corrosion in heat exchangers for fission and fusion nuclear reactors. The U.S. and Korean collaborators are highly respected scientists who have a record of successful collaboration. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperation between U.S. and Korean scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. This project will add an international cooperative dimension to Dr. Oriani's research under NSF Grant No. DMR-8714547.