Consistent Variation of Stress Corrosion Cracking Susceptibility and Passive Film-induced Stress for 7050 Aluminum Alloy with

Abstract:

The film-induced stress and susceptibility to stress corrosion cracking (SCC) of 7050 aluminum alloy in the chloride solution at various potentials have been studied in this paper. The results showed that a large tensile stress was generated by the passive film during original corrosion. The passive film induced tensile stress increased obviously with an increase in potential under an anodic potential; however, it decreased with an increase in potential when the potential E≥-1100 mVSCE while it increased when E＜-1100 mVSCE under a cathodic potential. The variation of film-induced stress with potential was consistent with that of the susceptibility to SCC with potential.

Key words:7050 aluminum alloy, stress corrosion cracking, passive film-induced stress, polarization potential