Altering Oxidation and Corrosion via Ion Implanted Amorphous Surfaces

这项研究项目考察了离子注入可以用来改善表面性能的两个领域，镍铬合金的氧化和不锈钢的腐蚀。人们相信，注入会在这些合金上形成一层1000埃的无定形薄膜。在镍铬合金中注入Y离子可提高其抗氧化性，其机理尚在研究中。磷离子注入不锈钢可在很小的剂量范围内形成非晶层。耐腐蚀性的提高在多大程度上取决于非晶相的均匀性和形成的少量第二相，目前正在研究中。在这两种情况下都使用了透射电子显微镜来检查注入层的结构、再结晶倾向、化学成分和缺陷结构。%离子注入可以用来创造其他方法无法获得的微结构和化学分布。该项目将阐明表面离子注入改善金属合金抗氧化性和耐腐蚀性的机理。

This research project examines two areas where ion implantation can be employed to improve surface properties, oxidation of nickel- chromium alloys and corrosion of stainless steels. It is believed that the implantation creates a one-thousand Angstrom layer that is amorphous on these alloys. Implanting yttrium ions into nickel- chromium alloys improves the resistance to oxidation, and the mechanisms of this improvement are under investigation. Phosphorous ion implantation of stainless steel produces an amorphous layer over a very narrow range of fluences. The extent to which the improved corrosion resistance depends on homogeneity of the amorphous phase and on small amounts of second phases that form is under study. Transmission electron microscopy is used in both instances to examine the structure of the implanted layers, recrystallization tendencies, chemistry, and defect structures. %%% Ion implantation can be used to create microstructures and chemical distributions not attainable by other means. This project should clarify the mechanisms by which surface ion implantation can be employed to improve oxidation and corrosion resistance of metal alloys.