Selective corrosion behavior of X80 steel heat affected zone by SRB in coastal saline soil. (June 2023)

• Record Type: Journal Article
• Authors: Yu, Youjun; Xu, Jin; Liu, Baixing; Chai, Tingxi; Sun, Cheng
• Is Part Of: International journal of pressure vessels and piping. Volume 203(2023)
• Publication Date: 2023-06
• Subjects: X80 steel -- Welded joint -- Coastal saline soil -- MIC -- SRB; Pressure vessels -- Periodicals; Pipe -- Periodicals; Récipients sous pression -- Périodiques; Tuyaux -- Périodiques; Pipe; Pressure vessels; Periodicals; 681.76041
• DOI: 10.1016/j.ijpvp.2023.104924
• Languages: English
• ISSNs: 0308-0161

Abstract

Abstract: The corrosion behavior of heat affected zone of X80 pipeline steel was investigated in coastal saline soil with or without sulfate-reducing bacteria (SRB). In the sterile soil environment, the diameter, depth, and density of corrosion pits detected in the coarse grain zone (CGZ) were larger than those in the fine-grained zone (FGZ) and fusion zone (FZ). In the soil environment inoculated with SRB, the microbes enhance the corrosion of FGZ, CGZ, and FZ. The corrosion susceptibility of CGZ coupons is stronger in the presence of SRB than those of FGZ and FZ coupons. Highlights: The hightest corrosion rate and deepest pitting depth of CGZ in sterile and inoculated coastal saline soil. The local corrosion sensitivity of CGZ is greatly increased under the combined action of Cl − and SRB in the coastal saline soil. In the coastal saline soil, Cl − and SRB are more likely to corrode CGZ with rich crystal defects, especially to increase pitting under the corrosion product.