Abstract
The effects of chloride on the electrochemical process and susceptibility to stress corrosion cracking (SCC) of SA516Gr70N steel in alkaline NaCl/Na2S solution were investigated by using electrochemical techniques (impedance spectroscopy and polarization curve measurement) and slow strain rate tensile (SSRT) tests. SA516Gr70N steel exhibited SCC susceptibility to a certain extent in alkaline NaCl/Na2S solution. The susceptibility to SCC decreased with increasing chloride concentrations in solutions with pH values of 9 and 11, while susceptibility was not apparent in higher pH solutions. Electrochemical analysis showed that the corrosion potential became more negative, and the anodic corrosion rate decreased with increasing chloride concentration due to the competitive adsorption of HS− and Cl−. The mechanism of SCC is mainly controlled by anodic dissolution with the addition of chloride.
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