Study on the roles of bisulfite in the stress corrosion cracking of 7050-T7451 aluminum alloy in the thin electrolyte layer environment. (1st May 2023)

• Record Type: Journal Article
• Authors: Wang, Mingtao; Wang, Liwei; Yang, Wendi; Liu, Yuxi; Terryn, Herman; Cui, Zhongyu
• Is Part Of: Corrosion science. Volume 215(2023)
• Publication Date: 2023-05-01
• Subjects: A: aluminum -- B: SEM -- C: stress corrosion -- C: atmospheric corrosion -- C: hydrogen absorption; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2023.111030
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Effect of bisulfite (HSO3 - ) on the stress corrosion cracking (SCC) behavior of 7050-T7451 aluminum alloy in the thin electrolyte layer environment in the presence of Cl - is investigated. Addition of HSO3 - inhibits the corrosion initiation but promotes the corrosion propagation and hydrogen uptake. With a quantitative calculation, the HSO3 - is demonstrated to significantly facilitate the synergistic effect between stress, corrosion, and hydrogen during the in-situ tensile test, resulting in the change of the SCC controlling step from corrosion-induced hydrogen to mechanical-electrochemical-hydrogen interactions. The buffer effect of HSO3 - plays a dominant role in the HSO3 - -induced acceleration of the SCC degradation. Highlights: Effect of HSO3 - on the SCC behavior of 7050 alloy in TEL environment containing Cl - is studied. HSO3 - inhibits corrosion initiation but promotes corrosion propagation and hydrogen uptake. Addition of HSO3 - changes the SCC controlling step of 7050 alloy in TEL environment. The buffer effect of the HSO3 - dominates the HSO3 - -accelerated SCC deterioration.