07095 Dissolution and Repassivation Kinetics of a 12.3-2.6Mo-6.6Ni Super Martensitic Stainless Steel: A Study of the Effect of H2S

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Product Number: 51300-07095-SG

ISBN: 07095 2007 CP

Author: Jakob Enerhaug, Unni Steinsmo, and Oystein Grong

Publication Date: 2007

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The specific effects of H2S on the localized corrosion behavior of a Fe-12.3Cr-6.5Ni-2.6Mo super martensitic stainless Steel (SMSS) alloy have been examined by means of the “artificial pit technique”. Addition of a critical amount of H2S is found to hinder repassivation and accelerate active dissolution in the SMSS pit within the stability domain of the adsorbed sulfur. Above the redox potential of H2S/S, the effect of H2S is found to cease, whereby the dissolution and repassivation kinetics become similar to that observed in H2S-free solutions. Activated pits show no signs of repassivation, not even at low surface concentration of dissolved species. It is concluded that the resistance to localized corrosion depends both on the potential and the H2S concentration, but the effect of H2S is most significant at low potentials.