Abstract
We investigate the corrosion-electrochemical properties of 17G1SU steel in chloride-acetate solutions for different concentrations of hydrogen sulfide. It is shown that, if this concentration increases, then the corrosion potential of steel shifts to the side of more negative values and the corrosion rate increases almost linearly. The presence of hydrogen sulfide does not affect the values of Tafel constants of the cathodic and anodic reactions. It is shown that the rate of cathodic reactions may become higher as a result of the direct reduction of hydrogen from H2S molecules. For hydrogen-sulfide concentrations > 1500 mg/dm3, the rate of cathodic processes decreases due to the complications of diffusion, which may be caused by the adsorption of hydrogen-sulfide molecules and a decrease in the rate of catalytic recombination of adsorbed hydrogen atoms. Hydrogen-induced cracking of stress-free steel is revealed for hydrogen-sulfide concentrations ≥ 500 mg/dm3.
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