Cerium-Based Sealing Treatment of Mg–Al Hydrotalcite Film on AZ91D Magnesium Alloy
来源期刊：Acta Metallurgica Sinica2016年第11期
论文作者：Qiang-Sheng Dong Zhi-Xin Ba Zhang-Zhong Wang Juan Kuang Zheng-Yang Cai Chen Yuan
文章页码：993 - 1000
摘 要：An environment-friendly cerium-based sealing treatment was developed to improve the surface integrity and corrosion resistance of Mg–Al hydrotalcite film on AZ91D magnesium alloy. The cerium dioxide was generated through three stages namely nucleation, growth and dissolution, modifying the surface of AZ91D Mg alloy, and the hydrotalcite film became integral after being treated for 30 min. The results of polarization curves showed that the anti-corrosive performance of the hydrotalcite film was enhanced by the sealing treatment. Moreover, the immersion tests and electrochemical impedance spectrum measurements also demonstrated that the sealed hydrotalcite film provided a longer-term protection of magnesium alloy from corrosion as compared to the unsealed one.
Qiang-Sheng Dong1,2，Zhi-Xin Ba1,2，Zhang-Zhong Wang1,2，Juan Kuang1，Zheng-Yang Cai1，Chen Yuan1
1. School of Materials Science and Engineering, Nanjing Institute of Technology2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
摘 要：An environment-friendly cerium-based sealing treatment was developed to improve the surface integrity and corrosion resistance of Mg–Al hydrotalcite film on AZ91D magnesium alloy. The cerium dioxide was generated through three stages namely nucleation, growth and dissolution, modifying the surface of AZ91D Mg alloy, and the hydrotalcite film became integral after being treated for 30 min. The results of polarization curves showed that the anti-corrosive performance of the hydrotalcite film was enhanced by the sealing treatment. Moreover, the immersion tests and electrochemical impedance spectrum measurements also demonstrated that the sealed hydrotalcite film provided a longer-term protection of magnesium alloy from corrosion as compared to the unsealed one.
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