Effect of dry/wet ratio and pH on the stress corrosion cracking behavior of rusted X100 steel in an alternating dry/wet environment. (10th November 2020)

• Record Type: Journal Article
• Authors: Gong, Ke; Wu, Ming; Xie, Fei; Liu, Guangxin; Sun, Dongxu
• Is Part Of: Construction & building materials. Volume 260(2020)
• Publication Date: 2020-11-10
• Subjects: Pipeline steel -- Dry/wet ratio -- pH -- Rust layer; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.120478
• Languages: English
• ISSNs: 0950-0618

Abstract

Graphical abstract: Highlights: Alternating dry/wet environment were simulated with different pH and D/W ratio. SCC of rusted X100 steel were investigated in alternating dry/wet environment. X100 is highly sensitive to stress corrosion at pH is 4 and D/W ratio is 3:1. The SCC mechanism of X100 steel in alternating dry/wet environment was clarified. Abstract: The stress corrosion cracking (SCC) behavior of X100 steel under alternating dry/wet conditions was investigated through electrochemical experiments and slow strain-rate testing. The results show that the corrosion morphology transforms from general corrosion to pitting with increasing dry/wet ratio (D/W). The corrosion product layer becomes less protective with decreasing pH, which leads to pitting and shows that anodic dissolution is promoted. In addition, local acidification under the corrosion product layer promotes the hydrogen evolution reaction. We conclude that the SCC mechanism of X100 steel under alternating dry/wet conditions at low pH and a high D/W ratio involves anodic dissolution and hydrogen evolution.