In situ monitoring of crevice corrosion morphology of Type 316L stainless steel and repassivation behavior induced by sulfate ions

•Repassivation of crevice corrosion on Type 316L was observed when the solution was changed from 1M NaCl to 0.88M Na2SO4 or to 1M NaCl-0.88M Na2SO4.•The active dissolution of Type 316L stainless steel in 1M NaCl at pH 0.4 was slightly suppressed by SO42− ions in anodic polarization measurements.•The...

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Bibliographic Details
Published in:Corrosion science 2017-10, Vol.127, p.131-140
Main Authors: Aoyama, Takahito, Sugawara, Yu, Muto, Izumi, Hara, Nobuyoshi
Format: Article
Language:English
Subjects:
Anodic polarization
Austenitic stainless steels
Corrosion
Corrosion mechanisms
Crevice corrosion
Monitoring
Potentiostatic
Repassivation
Stainless steel
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Summary:•Repassivation of crevice corrosion on Type 316L was observed when the solution was changed from 1M NaCl to 0.88M Na2SO4 or to 1M NaCl-0.88M Na2SO4.•The active dissolution of Type 316L stainless steel in 1M NaCl at pH 0.4 was slightly suppressed by SO42− ions in anodic polarization measurements.•The accumulation of SO42− ions toward the crevice brought about the repassivation. To analyze the repassivation mechanism induced by SO42− ions, in situ monitoring of the crevice corrosion morphology on Type 316L stainless steel was performed. The repassivation of the crevice corrosion was observed when the solution was changed from 1M NaCl to 0.88M Na2SO4 or to 1M NaCl-0.88M Na2SO4. The active dissolution of Type 316L stainless steel was suppressed by SO42− ions at pH 0.4 in anodic polarization measurements. The transition from active to passive states inside the crevice was likely promoted by SO42− ions.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2017.08.005