The electrochemical corrosion process of hydrogen sulfide

2025-12-23View Original

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Anodic process in the electrochemical corrosion of hydrogen sulfide: Fe – 2e → Fe2+. Cathodic process: 2H+ + 2e → H2. The hydrogen atoms then diffuse into the steel. Here, Had refers to hydrogen atoms adsorbed on the steel surface, while it represents hydrogen that diffuses within the steel. Product of the anodic reaction: Fe2+ + S2– → FeS ↓ Note: When steel is corroded by hydrogen sulfide, the final product at the anode is ferrous sulfide. This substance typically has a defective structure; it has poor adhesion to the steel surface, tends to flake off easily, is prone to oxidation, and has a positive potential. As a result, it acts as a cathode together with the steel matrix, forming an active microcell that continues to corrode the steel matrix.

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The electrochemical corrosion process of hydrogen sulfide

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