Electrochemical behavior of supermartensitic stainless steel was discussed in order to evaluate the susceptibility to intergranular stress corrosion cracking (IGSCC) of supermartensitic stainless steel (SMSS) subjected to girth welding. Electrochemical potentiokinetic reactivation (EPR) tests were carried out in various compositions of electrolytes for a rich grade SMSS containing Mo and a lean grade SMSS containing no Mo. The aqueous solution of H2SO4 and KSCN mixture is too aggressive for the rich grade SMSS to detect its intergranular corrosion for the grade of steel. For the lean grade SMSS, a rise in current density suggesting intergranular corrosion was observed in the EPR test under a weaker solution in a potential range of –50 to –200 mV vs SCE.

Subject
Steel surfaces, Intergranular stress corrosion cracking, Thermal cycle, Welding, Current densities, Steel, Sensitization, Passivation, Ferrite, Grain boundary, Intergranular corrosion, Austenite, Martensite
Keywords:
supermartensitic stainless steel, intergranular stress corrosion cracking, electrochemical potentiokinetic reactivation test, sensitization, post welding heat treatment
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2011
Association for Materials Protection and Performance (AMPP)
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