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Effect of solution concentration on sealing treatment of Mg-Al hydrotalcite film on AZ91D Mg alloy

Journal of Magnesium and Alloys 2017年第3期5卷 320-325页

作者： Qiangsheng Dong Zhixin Ba Yongqiang Jia Yongjun Chen Xiaoyu Lv Xiaobo Zhang Zhangzhong Wang School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167PR China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167PR China

cerium-based sealing treatment was developed for Mg-Al hydrotalcite film on AZ91D Mg alloy,and the influence of cerium salt solution was investigated to modify the surface integrity and corrosion *** electron microscope(SEM)and X-ray diffraction(XRD)measurements were carried out to analyze the surface morphology and phase *** corrosion resistance of Mg-Al hydrotalcite film after sealing treatment was evaluated by the polarization curve and electrochemical impedance spectroscopy(EIS)*** results showed that lower concentration of ce-containing solution was beneficial to seal the micro-cracks on Mg-Al hydrotalcite film,and improve the surface integrity and corrosion resistance;higher concentration of ce-containing solution could seal fewer micro-cracks,and the corrosion resistance was decreased owing to the disintegration of Mg-Al hydrotalcite film.

关键词： Mg alloy Mg-Al hydrotalcite film ce-containing solution Sealing treatment Corrosion resistance

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cerium-Based Sealing Treatment of Mg–Al Hydrotalcite Film on AZ91D Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2016年第11期29卷 993-1000页

作者： Qiang-Sheng Dong Zhi-Xin Ba Zhang-Zhong Wang Juan Kuang Zheng-Yang Cai Chen Yuan School of Materials Science and Engineering Nanjing　Institute of Technology Nanjing 211167 China Jiangsu Key Laboratory of Advanced Structural Materialsand Application Technology Nanjing 211167 China

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.

关键词： AZ91D magnesium alloy Mg-Al hydrotalcite film Sealing treatment ce-containing solution Corrosion resistance

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