2011•Cailiao rechuli xuebaoRequires access
Sr addition on intergranular and exfoliation corrosion properties of 7085 aluminum alloy
Xiaojing Xu, WU Gui-chao, Wang Bin, Fubao Zhang, Luo Yong, Song Tao, Cheng Cheng, Pan Li, Xiaonong Cheng
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Abstract
Intergranular and exfoliation corrosion properties of 7085 aluminum alloy containing Sr were studied.The results show that after annealing,hot compressive deformation processing,enhanced solid solution treatment(470 ℃×24 h+480 ℃×24 h+490 ℃×24 h),water quenching and T6 aging treatment(121 ℃×24 h),the alloy exhibits superior intergranular corrosion and exfoliation corrosion resistance,which is considerably better than that of 7075-T6 alloy.It is found that,the alloy presents only pitting corrosion rather than intergranular corrosion after intergranular corrosion test,and only PA grade exfoliation corrosion occurs for exfoliation corrosion test.The corrosion resistance of the 7085 aluminum alloy containing Sr is superior to 7075 alloy.It is believed that the excellent corrosion resistance of the alloy is ascribed to the low total amount of alloying elements(10.073%),the high element ratios of Zn/Mg(4.97) and Cu/Mg(1.06) and the micro-alloyed effects of zirconium and strontium(refining microstructure and improving recryscallization resistence).