Seeking help in understanding pitting corrosion on stainless steel surfaces?
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In high-temperature and high-humidity environments, martensitic stainless steel products exhibit pitting in the areas that have come into contact with tools made of high-carbon alloy tool steel. It is likely that residues from the tooling remain in the areas that have come into contact with the tooling fixtures, and then oxidation and corrosion occur under high temperature and humidity conditions. Is it the high content of carbon, which is a residual component, that disrupts the chemical equilibrium of stainless steel, leading to the formation of chromium-deficient areas, the destruction of the passivation layer, and ultimately the intrusion of oxygen atoms that cause corrosion? If not, what could be the reason? Thank you for helping to answer!
This post was last edited by Wang Genrong on 2019-11-24 08:18. This is likely corrosion caused by the damage to the passivation film and iron contamination. Carrying out pickling and passivation after processing can solve such problems.
Thank you! Could you please tell me how the passivation film is damaged? How does iron cause corrosion?