In the present work, the influence of stress and notch orientation on stress corrosion cracking (SCC) susceptibility of aluminum Alloy AA(1) 5052 (Al-2.5 wt% Mg) was investigated. The experiments were performed by measuring the time-to-failure (TTF) of Al Alloy AA 5052 specimens under conditions of applied anodic current. The applied stresses (σ) were in the region where SCC is observed (threshold stress < σ < yield point) in the 3.5% NaCI solution, which was used for the corrosive medium.
The oriented growth of γ1-Al203 cells and the orientation of the stress axis of the specimen both simultaneously influence the TTF during SCC tests of Al Alloy AA 5052 specimens. For unnotched specimens, the primary determining factor is the oriented growth of γ1-Al203 cells; longer TTFs were observed when the stress axis of the specimen was horizontal. For notched specimens, the orientation of stress axis of the specimen was the main determining factor; longer TTFs were observed when the stress axis of the specimen was vertical (horizontal notch).
