Accelerated Corrosion of Steel by Suspended Iron Sulfides in Brine

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Abstract
In predominantly anaerobic sulfide-containing systems—such as often found in the petroleum industry — iron sulfide solids are frequently associated with accelerated corrosion of steel equipment, especially when traces of air contaminate the corrodent. Laboratory studies reported here focus on the mechanism of this phenomenon. Other metal sulfides show similar acceleration but the bulk of experiments here concern iron sulfides. Corrosion acceleration by suspended iron sulfides is due to cathodic depolarization, apparently by stimulation of hydrogen ion reduction. The action of a limited amount of oxidizing agent, e.g., oxygen from air, is to produce a sulfide capable of even greater acceleration of cathodic kinetics, also likely due to facilitation of hydrogen ion reduction.

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