Comparison of Mo–N and W–N synergism during passivation of stainless steel through x-ray photoelectron spectroscopy and electrochemical analysis

钝化 X射线光电子能谱 腐蚀 渗氮 材料科学 溶解 氮化物 氮气 合金 表层 被动性 磷化物 电化学 电解质 极化(电化学) 图层(电子) 冶金 金属 化学工程 化学 电极 复合材料 物理化学 有机化学 工程类 电气工程
作者
Gary P. Halada,C.R. Clayton
出处
期刊:Journal of vacuum science & technology [American Institute of Physics]
卷期号:11 (4): 2342-2347 被引量:72
标识
DOI:10.1116/1.578373
摘要

In high nitrogen stainless steels and nitrogen surface-doped Mo-containing alloys, nitrogen has been shown to enhance passivity. The mechanism of this apparent Mo–N synergism appeared to be twofold. First, the formation of stable surface nitrides affects a reduction in active dissolution, and, second, reactions between the surface nitride and the electrolyte lead to an increase in interfacial pH, a condition favorable to the formation of an enhanced bipolar passive film. In this study, we compare and contrast the effect of surface nitriding of a Fe–19Cr–9Ni–2W on passivity to the effects previously reported for analogous systems alloyed with Mo. Electrochemical potentiodynamic polarization in deaerated 0.1 M HCl is used to examine the general effects on corrosion inhibition. Qualitative and quantitative analysis of the surface of each alloy following doping with nitrogen and passivation was conducted with variable angle x-ray photoelectron spectroscopy to provide depth-dependent information on the types and amounts of chemical species present. The synergism between W and N is found to be similar to that of Mo and N in enhancing the bipolar nature of the passive film by increasing the amount of tungstate incorporated into the outer layer of the passive film. The primary differences between the structures of the passive films in the two cases result from the passive nature in acidic media of the trioxide of tungsten as opposed to that of molybdenum.
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