Abstract
The corrosion products and electrochemical corrosion behavior of X80 pipeline steel in saline solution with saturated H2S at 50°C were evaluated. The results showed that mackinawite and cubic FeS were the primary and secondary crystalline phases observed and that a series of changes in the size, shape, thickness, and chemical composition occurred as the immersion stages developed. Electrochemical results showed that the sulfide film hindered pitting and enhanced the corrosion resistance definitely. Zero-resistance ammeter measurements showed that the sulfide film repaired itself when local failure occurred.
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