Corrosion performance of low alloy steels in sub-Arctic natural seawater

• Main Authors: Chernov, B. B., Chaves, I. A., Nugmanov, A. M., Melchers, R. E.
• Other Authors: The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
• Format: Article in Journal/Newspaper
• Language: English
• Published: NACL International 2018
• Subjects: arctic; long-term; marine; mass loss; modeling studies; steel; Arctic; Pacific
• Online Access: http://hdl.handle.net/1959.13/1404959

Corrosion mass loss trends for low alloy and for high-strength structural steels of grades A, B, D, AH, and DH exposed for up to 5 years in sub-Arctic seawater near Vladivostok are compared with trends in temperate Pacific Ocean waters at Taylors Beach. All corrosion losses show bi-modal trending. The losses at Vladivostok are initially some 25% of those at Taylors Beach but later are some 60%, a change attributed to the change in corrosion rate controlling mechanisms consistent with the bi-modal trending pattern. At both test sites pollution is low and microbiological corrosion unlikely to be a significant influence. The high-strength steels show slightly lower corrosion losses after about 1 year exposures. The results show that characterization of corrosion trends based on short-term (e.g., 1 year) exposures can be highly misleading for estimating longer-term corrosion losses.