Synergistic effect of stress and crevice on the corrosion of N80 carbon steel in the CO2-saturated NaCl solution containing acetic acid

• Published in: Corrosion science 2017-07, Vol.123, p.228-242
• Main Authors: Li, Y.Z., Guo, X.P., Zhang, G.A.
• Format: Article
• Language: English
• Subjects: A. Carbon steel; Acetic acid; B. Crevice corrosion; B. EIS; C. SEM; C. Stress corrosion; Carbon dioxide; Carbon steels; Corrosion effects; Crevice corrosion; Sodium chloride; Stress analysis; Stress concentration; Stress corrosion cracking; Studies; Synergistic effect
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2017.05.005

•Corrosion behavior of steel in the coexistence of stress and crevice was studied.•The potential of steel shifts negatively and the corrosion is promoted under stress.•A deep groove formed at crevice mouth results in obvious stress concentration.•Stress concentration results in larger driving force for crevice corrosion.•There is synergistic effect of crevice and stress on the corrosion of steel. The corrosion behaviour of N80 carbon steel under the coexistence of stress and crevice in the CO2-saturated NaCl solution containing acetic acid (HAc) was studied by electrochemical measurements, surface analysis, and stress analysis. It is demonstrated that the corrosion potential of steel shifts negatively and corrosion activity is enhanced with increasing stress. A deep corrosion groove is formed at crevice mouth, which causes stress concentration, increasing the susceptibility to stress corrosion cracking (SCC). The stress concentration also results in larger driving force for crevice corrosion. Therefore, there is a synergistic effect of stress and crevice on the corrosion of steel.