Research on corrosion resistance of anodized and sealed 6061 aluminum alloy in 3.5 % sodium chloride solution
Xufeng Yu, Guoqing Zhang, Zhaoxia Zhang, Yingguang Wang
Abstract
6061 aluminum alloy is anodized and sealed by an anodic oxidation method to greatly improve its corrosion resistance and mechanical performance. The anodized aluminum alloy is composed of a porous layer outside and a barrier layer inside. Hardness of anodized and sealed aluminum alloy increases greatly due to the combination of α-Al2O3 and γ-Al2O3 structures. The surface of the anodized aluminum alloy after sealing treatment shows netlike and denser morphology which is beneficial to improve corrosion resistance. It is found that the anodized aluminum alloy sealed with potassium dichromate possesses minimum corrosion current density and the least weight loss which indicates optimal corrosion resistance.