Effect of solution pH on electrochemical and stress corrosion cracking behaviour of a 7150 Al–Zn–Mg–Cu alloy

Some effects of alloy composition on stress corrosion cracking in Al–Zn–Mg–Cu alloys

“…Intergranular stress corrosion cracking (SCC) of aluminium alloys continues to be a significant issue with 7xxx series Al-Zn-Mg-Cu alloys [1,2], especially observed for short-transverse (S-L and S-T) crack orientations in plate and forgings. SCC depends on numerous variables, such as alloy composition, ageing condition, and environment (e.g.…”

Influence of Contaminated NH3 on Stress Corrosion Behavior of 7075 High Strength Aluminum Alloy in Marine Atmosphere Environment

“…Burleigh [14] reviewed the earlier research on aluminum alloy SCC and believed that anodic dissolution type SCC mainly occurs in Al-Cu-Mg alloy, while hydrogen induced cracking type SCC exists in Al-Zn-Mg-Cu alloy. In contrast, a great number of later researches argued that the synergy mechanism of the two types can better explain the essence of high strength Aluminum Alloy SCC [8][9][10]. In this paper, the addition of significantly promoted the stress corrosion behavior of the two kinds of high strength aluminum alloy.…”

“…We believe that this is because the natural environment corrosion test generally needs a long time, but the completed test is mainly concerned with the weight loss and morphology change for the corrosion. It is difficult to carry out in-depth study of its stress corrosion behavior.Recently, researchers usually use the tensile test in the solution for the study of stress corrosion of aluminum alloy [8][9][10]. But in the marine atmosphere, the essence of aluminum alloy corrosion is the electricity chemical process in unsteady thin electrolytes layer whose thickness, shape and distribution will be of cyclical changes due to temperature, humidity, light, rainfall and other factors with alternating effects.…”

Correlations between stress corrosion cracking, grain boundary precipitates and Zn content of Al–Mg–Zn alloys

“…An aspect ratio of 1 corresponds to uniform corrosion, and a ratio about 1000 is generally observed for a growing stress corrosion crack [34]. For Al alloys, the crack propagation is much more difficult from a pit with a such high aspect ratio [35]. In the current study, the cracks have originated from the edge of the specimen and also the intergranular regions for Alloy 1.…”