Effects of heat treatments on the microstructure and localized corrosion behaviors of AA7075 aluminum alloy

• DOI: 10.1016/j.corsci.2023.111361
• Publication Date: 2023-06-25T08:07:11Z
• Authors: Yida Xiong; Joseph D. Robson; Yichao Yao; Xiangli Zhong; Francesco Guarracino; Artenis Bendo; Zelong Jin; Teruo Hashimoto; Xuzhao Liu; Michele Curioni
• Keywords: Alonizing

Five different heat treatments were applied to AA7075 aluminum alloy, resulting in distinct localized corrosion behaviors 5 wt% NaCl solution. Some exhibited higher intergranular (IGC) susceptibility due the anodic nature of grain boundaries (GBs) caused by Cu depletion precipitate free zones (PFZs) along GBs. Cu-enrichment and an increase intervals between η-phase boundary precipitates (GBPs) did not improve IGC resistance. The open circuit (OCP) galvanostatic (GL) tests could distinguish differences behaviors, suggesting potential use GL testing as a faster method for predicting behaviors.