Influence of Alloying on the Nature of Passive Films and Their Breakdown

合金化对钝化膜性质及其破坏的影响

• 批准号: 9108368
• 负责人: Jerome Kruger
• 金额: $ 26万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1995-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9108368&HistoricalAwards=false
• 关键词: Influence; Alloying; Nature; Passive; Films

This research examines factors leading to breakdown of protective passive films on metals. Sophisticated experimental methods are used to follow the effects of hydrogen and chloride anions in film deterioration. Neutron reflectivity studies are carried out on mirror-smooth alloy surfaces of iron and iron-chromium alloys to determine how hydrogen is distributed in the passive films and the manner of breakdown of passivity in the films. EXAFS (Extended X- ray Absorption Fine Structure) analysis in conjunction with a photocathode proportional counter detector is used to determine the presence of damaging anions in the passive film surface. The effect of chromium content in iron alloys on passive film properties relevant to film breakdown is studied by anodic polarization in buffered borate solutions. These data are incorporated into a model of the passive film breakdown process. %%% The passivity of non-noble metals and their alloys is the basis for the successful application of metallic materials in technologies where they are exposed to aqueous environments. The special film that forms on the surfaces of metals, the passive film, enables them to resist corrosion failure. Detailed knowledge is needed on how alloying constituents affect the structure, composition, and electronic properties of passive films to improve the corrosion resistance of metal alloys.

本研究探讨了导致保护性心肌细胞破坏的因素， 金属上的钝化膜 先进的实验方法 用于跟踪胶片中氢和氯阴离子的影响 恶化 中子反射率的研究进行了 镜面光滑的铁和铁铬合金表面， 确定氢是如何分布在钝化膜和 膜中钝化的破坏方式。 EXAFS（Extended X- 射线吸收精细结构）分析， 光电阴极正比计数器检测器用于确定 在钝化膜表面存在破坏性阴离子。 的 铁合金中铬含量对钝化膜的影响 用阳极极化法研究了与膜击穿有关的性质 在缓冲硼酸盐溶液中的极化。 这些数据 将其并入被动膜击穿过程的模型中。 %%% 非贵金属及其合金的钝化性是 金属材料在技术上的成功应用 在那里它们暴露于水性环境。 专题片 在金属表面形成的钝化膜， 以防止腐蚀失效。 需要详细了解 合金成分如何影响结构、成分和 钝化膜的电子性能，以改善腐蚀 金属合金的电阻。