Corrosion resistance of anodized AZ31 Mg alloy in borate solution containing titania sol |
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Authors: | Guo Yan Wang Guixiang Dong Guojun Gong Fan Zhang Lili Zhang Milin |
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Affiliation: | aKey Laboratory of Superlight Material and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China |
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Abstract: | Anodic films were prepared on the AZ31 magnesium alloy in alkaline borate solution with or without addition of titania sol under the constant potential of 50 V (dc) for 10 min at room temperature. The morphology of the anodic films was observed by scanning electron microscope (SEM). The corrosion resistance of the anodic films was evaluated in 3.5% NaCl solution using fast anti-acid test, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The anodic film formed in borate solution with addition of 4% titania sol has superior uniform surface and higher corrosion resistance than in other conditions. |
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Keywords: | AZ31 Mg alloy Anodizing Titania sol Corrosion resistance |
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