Comparative Study on the Effect of Over-aging and Addition of Zr on the Corrosion Resistance of Al-Zn-Mg Alloy
QU Meng1, TANG Jianguo1, YE Lingying1, LI Chengbo1,2, LI Jianxiang2, ZHOU Wang2, DENG Yunlai1
1 School of Materials Science and Engineering,Central South University,Changsha 410083,China 2 Guangdong Hoshion Industrial Aluminium Co.,Ltd.,Zhongshan 528463,China
Abstract: Taking Al-Zn-Mg alloy as research object, a comparative study about the effect of over-aging treatment and adding Zr on the corrosion resis-tance of Al-Zn-Mg alloy was carried out by means of slow strain rate test(SSRT), intergranular corrosion(ICG) and exfoliation corrosion tests (EXCO). In light of the results, over-aging treatment (T76) was superior to peak-aging treatment (T6) because of its significant effect in enhancing the stress corrosion cracking(SCC), intergranular corrosion and exfoliation corrosion resistance of Al-Zn-Mg alloy. A remarkable improvement in the strength of Al-Zn-Mg alloy could be observed by adding 0.15% Zr. In addition, amelioration of corrosion resistance of the alloy in different extents was achieved, in which the stress corrosion cracking and intergranular corrosion resistance showed the most obvious amelioration. However, adding Zr was less effective in improving exfoliation corrosion resistance of the alloy than over-aging treatment. The mechanism for the influence of over-aging treatment and adding Zr on the corrosion resistance of the alloy was analyzed by means of scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). It was found that over-aging treatment made the grain boundary precipitates (GBPs) of the alloy turn coarse and intermittently distributed, and widened the precipitate free zone (PFZ). While the addition of Zr inhibited the recrystallization of the alloy, and the reduction of large-angle grain boundary fraction contributed to enhancing the corrosion resistance of the alloy.
瞿猛, 唐建国, 叶凌英, 李承波, 李建湘, 周旺, 邓运来. 过时效与添加Zr对Al-Zn-Mg合金耐腐蚀性能影响的对比[J]. 材料导报, 2020, 34(2): 2083-2087.
QU Meng, TANG Jianguo, YE Lingying, LI Chengbo, LI Jianxiang, ZHOU Wang, DENG Yunlai. Comparative Study on the Effect of Over-aging and Addition of Zr on the Corrosion Resistance of Al-Zn-Mg Alloy. Materials Reports, 2020, 34(2): 2083-2087.
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2020, Vol. 34 
