Micro-arc oxidation coatings on Mg-Li alloys

稀有金属（英文版）, 2009, 28(2): 160-163. doi: 10.1007/s12598-009-0032-4

^1, , ^2, , ^3, , ^4, , ^5,

1.Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China;Key Laboratory of the Ministry of Education for Super Light Materials and Surface Technology,Harbin Engineering University,Harbin 150001,China

2.Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China

3.Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China

4.Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China

5.Key Laboratory of the Ministry of Education for Super Light Materials and Surface Technology,Harbin Engineering University,Harbin 150001,China

Micro-arc oxidation coatings on Mg-Li alloys

XU Yongjun ^1, , LI Kang ^2, , YAO Zhongping ^3, , JIANG Zhaohua ^4, , ZHANG Milin ^5,

2.Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China

3.Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China

4.Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China

5.Key Laboratory of the Ministry of Education for Super Light Materials and Surface Technology,Harbin Engineering University,Harbin 150001,China

Keywords： Mg-Li alloys

Micro-arc oxidation (MAO) method was used for the surface modification of an Mg-5wt.%Li alloy. Ceramic coatings were in-situ fabricated on the Mg-Li alloy. The morphology feature, phase composition, and corrosion-resistance of the formed ceramic coatings were studied by SEM, XRD, and electrochemical methods, respectively. The results showed that the coatings produced in a sodium silicate solution system were composed of MgO and Mg2SiO4. The ceramic coating became thicker and the content of Mg2SiO4 phase increased as the concentration of Na2SiO3 increased in the solution. The coating was loose at the low concentration of Na2SiO3 and was compact at the high concentration of Na2SiO3. The coated samples had a better corrosion resistance than the Mg-Li substrate in terms of the Tafel polarization curves and the cyclic voltammetry curves (CV).

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Micro-arc oxidation coatings on Mg-Li alloys

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