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

该提案要求资金允许明尼苏达大学腐蚀研究中心教授兼主任Richard a . Oriani博士与韩国科学技术院（KAIST）材料科学与工程系Su-Il Pyun博士进行为期24个月的合作研究项目，研究氢对铁和镍钝化膜的影响。研究将集中在三个具体任务上，即(1)测定氢在钝化氧化膜中的迁移率，(2)氢对钝化膜离子和电子性能的影响，以及(3)氢对钝化膜点蚀特性的影响。铁和镍物体的表面通常由表面的钝化氧化膜层保护以防止腐蚀。在目前的项目中，合作者将研究金属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。每当在酸性介质中发生自由腐蚀时，似乎都涉及到氢在钝化层上的传输，因为氢既存在于金属内部，也存在于水相中。本项目将主要研究氢在酸性介质中自由腐蚀和应力腐蚀开裂中的输运动力学和机制，但研究将有助于理解金属的应力腐蚀开裂和腐蚀疲劳。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，有着成功的合作记录。该项目与美韩合作科学项目的目标相关，该项目旨在通过科学信息、思想、技能和技术的交流以及在互利问题上的合作，提高美韩科学家和工程师之间的合作水平。这个项目将为奥里亚尼博士的研究增加一个国际合作的维度。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.