Effects of Alclad Layer and Anodizing Time on Sulfuric Acid Anodizing and Film Properties of 2E12 Aluminum Alloy
Gao-hong CHEN1, Yuan-sen HU2, Mei YU2,*(), Jian-hua LIU2, Guo-ai LI1
1 Beijing Institute of Aeronautical Materials, Beijing 100095, China 2 School of Materials Science and Engineering, Beihang University, Beijing 100191, China
Alclad and unclad 2E12 aerospace aluminum alloy were treated by sulfuric acid anodic oxidation. The effects of alclad layer and anodizing time on the anodization behaviour and corrosion resistance of anodic oxide layer on 2E12 aluminum alloy were studied. Surface and cross-section morphology of anodic oxide films were observed by scanning electron microscopy. The electrochemical properties of anodic oxide films were analyzed by potentiodynamic polarization curve and electrochemical impedance spectroscopy. The results show that the protective anodic oxide layers are formed on alclad and unclad 2E12 aluminum alloy. The film thickness increases with anodizing time extending. The copper rich second phase particles lead to more cavity defects and even micro cracks on anodic oxide films of unclad 2E12 aluminum alloy. The anodic oxide films on alclad 2E12 aluminum alloy are thicker and have fewer cavity defects, resulting in better corrosion resistance. The films obtained after 30min and 45min anodic oxidation treatment exhibit lower corrosion current and higher impedance of the porous layer than other anodizing time.
陈高红, 胡远森, 于美, 刘建华, 李国爱. 包铝层和氧化时间对2E12铝合金硫酸阳极氧化及膜层性能的影响[J]. 材料工程, 2017, 45(7): 19-26.
Gao-hong CHEN, Yuan-sen HU, Mei YU, Jian-hua LIU, Guo-ai LI. Effects of Alclad Layer and Anodizing Time on Sulfuric Acid Anodizing and Film Properties of 2E12 Aluminum Alloy. Journal of Materials Engineering, 2017, 45(7): 19-26.
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