Corrosion of iron and of three commercial steels in H2-H2S and in H2-H2S-CO2 gas mixtures at 400-700°C

被引：0

作者：

Gesmundo, F. ^{[1
]}

Viani, E. ^{[1
]}

Znamirowskil, W. ^{[1
]}

Godlewski, K. ^{[1
]}

Bregani, F. ^{[1
]}

机构：

[1] Univ di Genova, Genoa, Italy

来源：

Werkstoffe und Korrosion | 1992年 / 43卷 / 03期

关键词：

Calorimetry - Iron - Kinetic theory;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The corrosion behavior of three commercial steels including a carbon, a low-chromium (2.25Cr-1Mo) and a medium-chromium (9Cr-1Mo) steel in H2-H2S and in H2-H2S-CO2 mixtures has been investigated at 400-700°C under two sulfur pressures at each temperature. The ternary mixtures had the same sulfur pressure as the binary gases, but also a small partial pressure of oxygen. The corrosion of pure iron in the same H2-H2S mixtures was also studied for comparison. The scales formed on the steels were always composed of sulfides only: they showed a typical duplex structure as well as a strong tendency to crack and spall off during cooling. The corrosion kinetics of the steels were generally irregular, presenting an initial period of decreasing rate and a second approximately linear stage. On the other hand, the scales formed on iron were compact and well adherent to the metal, while the corrosion kinetics appeared to be generally controlled by a surface reaction step, leading to a transition from linear to parabolic behavior. The kinetics and mechanisms of scale growth for both iron and the steels are examined and discussed.

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页码：83 / 95