Abstract: The effect of different grain structures on corrosion performance of 7150 alloy was studied by four-point bending test, exfoliation corrosion immersion, optical microscope (OM), electron back scattered diffraction (EBSD), and scanning transmission electron microscope (STEM). The results show that the coarse grain on surface has higher stress corrosion sensitivity. The fracture time of samples with coarse grain and fiber grain are about 16 h and 124 h, respectively. The anti-exfoliation corrosion of coarse grain is superior to the fiber grain. The exfoliation corrosion grade of coarse grain is P, while the exfoliation corrosion grades of fiber grain are EC/D. Coarse grain boundaries are high-angle grain boundaries with higher surface energy, and have wider precipitate-free zone (PFZ), which decreases the boundary strength. So, the stress corrosion cracks are easy to propagate along the high-angle grain boundaries. Poor exfoliation corrosion of fiber grain is related to the low content of Cu in grain boundary precipitates (GBPs) leading to the dissolution of precipitates. And the continuous distribution of grain boundary precipitates in fiber grain accelerates the dissolution process. Therefore, fiber grain has higher sensitivity of exfoliation corrosion.
贺春花, 李红萍, 叶凌英, 刘胜胆, 唐建国. 晶粒组织对7150铝合金抗腐蚀性能的影响[J]. 材料导报, 2021, 35(22): 22109-22114.
HE Chunhua, LI Hongping, YE Lingying, LIU Shengdan, Tang Jianguo. Effect of Grain Structure on Corrosion Resistance of 7150 Al Alloy. Materials Reports, 2021, 35(22): 22109-22114.
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2021, Vol. 35 
