Crevice corrosion behavior of X70 steel in NaCl solution with different pH

•Crevice corrosion could be initiated in pH = 2 and pH = 12 solution.•Crevice corrosion could not occur in pH = 6.8 solution.•The rise of pH and Cl− inside crevice lead to crevice corrosion in pH = 2 solution.•The rise of H+ and Cl− inside crevice lead to crevice corrosion in pH = 12 solution.•The d...

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Bibliographic Details
Published in:Corrosion science 2021-04, Vol.182, p.109310, Article 109310
Main Authors: Mu, J., Li, Y.Z., Wang, X.
Format: Article
Language:English
Subjects:
A. Steel
B. EIS
B. SEM
C. Crevice corrosion
Corrosion
Crevice corrosion
Galvanic corrosion
High strength low alloy steels
Sodium chloride
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Summary:•Crevice corrosion could be initiated in pH = 2 and pH = 12 solution.•Crevice corrosion could not occur in pH = 6.8 solution.•The rise of pH and Cl− inside crevice lead to crevice corrosion in pH = 2 solution.•The rise of H+ and Cl− inside crevice lead to crevice corrosion in pH = 12 solution.•The decrease of OCP outside crevice erases galvanic corrosion in pH = 6.8 solution. The crevice corrosion of X70 steel in 0.34 mol/L NaCl solution with different pH was investigated. The crevice corrosion could be initiated in pH = 2 and pH = 12 solution and it could not occur in pH = 6.8 solution. The increase of pH and Cl− inside crevice are responsible to crevice corrosion in pH = 2 solution. However, the decrease of pH and increase of Cl− inside crevice contribute to crevice corrosion in pH = 12 solution. The negative shift of OCP of steel outside crevice results in the disappearance of galvanic corrosion and then crevice corrosion could not occur in pH = 6.8 solution.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109310