2005 Volume 54 Issue 4 Pages 152-157
The effect of iron sulfide on the cathodic reactions was studied in anaerobic conditions for the purpose of analyzing the corrosion mechanism in the seawater containing hydrogen sulfide. The iron sulfide was formed under both natural corrosion conditions and anodic polarizations. In the case of natural corrosion, the existence of iron sulfide film increased the cathodic current to a certain extent. The anodically formed iron sulfide enhanced the cathodic reaction considerably. Cathodic current at a constant potential was strongly dependent on anodic potential at which iron sulfide was formed. The open circuit corrosion potentials of steel covered with iron sulfide were also a function of anodic potential for iron sulfide formation.