Stress Corrosion Cracking Behavior of 2024 and 7075 High-Strength Aluminum Alloys in a Simulated Marine Atmosphere Contaminated with SO2

摘要

The stress corrosion cracking (SCC) of high-strength 2024-T351 and 7075-T651 aluminum alloys in simulated marine atmospheric medium containing HSO3? was investigated. The results showed that the presence of HSO3? could significantly accelerate the corrosion process of 2024-T351 and 7075-T651 high-strength aluminum alloy. This process was attributed to the enhanced anodic dissolution and hydrogen embrittlement caused by the HSO3?. The SCC susceptibility showed an increasing trend in both of aluminum alloys with increasing HSO3? concentration. Meanwhile, the hydrogen generated by HSO3? was shown to change the failure mode of these two aluminum alloys.