Study of Passive Films on Iron-base Alloy in High-Temperature-High -Pressure Aqueous Solution

Fe-26 Cr合金在高温Boric Borate解决方案中的腐蚀行为已在自动实验室和远热中进行了电化学研究，并将合金的表面特征化进行了性能分析，并以同样的方式使用Auger电子光谱学和argon-ion sputter-etching。合金的铬成分在哪一个潜在区域中稳定了被动电影狭窄的溶液温度（22 ° C-250 ° C）。在200 ° C时，合金物质在200 ° C时被氧化化90分钟的溶液在自然吸收潜力中具有最大值，然后通过增加anodic潜力的退化;被动膜的深度组成概况揭示了氧化物膜/基底界面中的一个内部氧化过程。这是预期的，氧化物离子通过外氧化物薄膜的反应与底层合金形成内部氧化物层。

The corrosion behavior of Fe-26Cr alloy in a high-temperature-boric borate solution was electrochemically investigated in a autoclave and furthermore, the surface characterization of the alloy was performed with simultaneous use of Auger electron spectroscopy and argon-ion sputter-etching. The potential region in which chromium component of the alloy stabilizes the passive film narrows with increasing solution temperature (22゜C-250゜C). The surface enrichment of chromium component for the alloy specimen anodically oxidized for 90 min at 200゜C in the solution has a maximum at the potential of natural immersion and then decreases with increasing the anodic potential.The depth-composition profile of the passive film has revealed that an inner oxidation proceeds in the oxide film/substrate interface. It is expected that oxygen ions duffusing inwards through the outer oxide film react with the substrate alloy to form the inner oxide layer.