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11101 Understanding of the Mechanism of Intergranular Stress Ccorrosion Cracking for Supermartensitic Stainless Steel from Electrochemical Point of View

Picture for 11101 Understanding the Mechanism of Intergranular Stress Corrosion Cracking for Supermartensitic SS
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Product Number: 51300-11101-SG
ISBN: 11101 2011 CP
Author: Yukio Miyata and Mitsuo Kimura
Publication Date: 2011
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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.

Keywords: supermartensitic stainless steel, intergranular stress corrosion cracking, electrochemical potentiokinetic reactivation test, sensitization, post welding heat treatment
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.

Keywords: supermartensitic stainless steel, intergranular stress corrosion cracking, electrochemical potentiokinetic reactivation test, sensitization, post welding heat treatment
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