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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Passivity of Martensite-Based Stainless Steel Oil Country Tubular Goods in Sour Environment
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Passivity of Martensite-Based Stainless Steel Oil Country Tubular Goods in Sour Environment

机译：Passivity of Martensite-Based Stainless Steel Oil Country Tubular Goods in Sour Environment

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摘要

Passivity of the martensite-based stainless steels for oil country tubular goods, 15Cr (15Cr-6Ni-2Mo-1Cu) and 17Cr (17Cr-4Ni-2.5Mo-1Cu-1W), in an H2S environment were investigated. The depassivation pH of the 15Cr was around 3.2 to 3.5, and that of the 17Cr was around 3.0 in a 10 H2S environment. The difference in the depassivation pH between the 15Cr and the 17Cr corresponded to the difference in the applicable pH limits of the 15Cr and the 17Cr for sulfide stress cracking (SSC). It was suggested that depassivation is one of the dominant factors that determine the applicable limit for SSC. Analyses of the passivation film were also conducted to investigate the mechanism of the depassivation. Direct observation and analysis of the passivation film were successfully performed with a high-resolution transmission electron microscope. It was revealed that sulfur, which had originated from H2S in the environment, had penetrated into the passivation film. This led to the assumption that the penetration of sulfur into the passivation film relates to the deterioration of the passivation film, which would lead to the initiation of SSC. The resistance of the passivation film to the effect of sulfur could be a crucial factor in decreasing the SSC susceptibility in terms of passivity. The phase dependence of the passivity in the 17Cr was also discussed with regard to electrochemistry.

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