Cerium Chemical Conversion Coating on a Novel Mg-Li Alloy

武汉理工大学学报-材料科学版(英文版), 2010, 25(1): 112-117. doi: 10.1007/s11595-010-1112-x

^1, , ^2, , ^3,

1.Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

2.Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

3.Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

基金项目: the National Natural Science Foundation of China(50603003)

Cerium Chemical Conversion Coating on a Novel Mg-Li Alloy

GAO Lili ^1, , ZHANG Chunhong ^2, , ZHANG Milin ^3,

1.Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

2.Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

3.Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

Keywords： Mg-Li alloy

A novel Mg-Li alloy was treated in a cerium nitrate solution and cerium chemical conversion coating was obtained on the alloy. Then the forming process, structure and corrosion resistance of the coating were investigated. The influential factors of cerium conversion coating were discussed through orthogonal experiments, and the optimum processing parameters were confirmed. XPS spectra displayed that the conversion coating consisted of cerium compounds, and the major component of the protective layer was a mixture of Ce (Ⅳ) oxide and Ce (Ⅳ) hydroxide. In addition, XRD pattern illustrated that there was crystalline CeO_2 in the conversion coating. Analysis by SEM showed that the cerium conversion coating was uniform with a fiber-like morphology. The thickness of the conversion coating was 12 μm. The results of electrochemical potentiodynamic polarization and hydrogen evolution measurement indicated that the cerium conversion coating provided effective protection to the novel Mg-Li alloy.

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Cerium Chemical Conversion Coating on a Novel Mg-Li Alloy

参考文献