Growth characteristics of stress corrosion cracking in high-strength 7075 aluminum alloy in sodium chloride solutions

Stress corrosion cracking occurs in alloys subjected to tension in specific corrosive environments. Corrosion products that affect crack growth can be formed. This study aims to clarify their influence on the crack growth of 7075-T651 aluminum alloy in NaCl solution and proposes a method to obtain the crack growth property. Crack growth tests reveal that corrosion products create crack bridging which hinders crack opening, and as a result, the crack growth is decelerated. Hence, to obtain the crack growth property in 7075-T651 in NaCl solution, it is effective to use additives that prevent the formation of corrosion products.