<abstract xmlns="http://www.w3.org/1999/xhtml">Micro-arc oxidation was applied to AZ91D magnesium alloy by taking K2Cr2O7 as the colouring salt in the silicate system. It was shown that the green coating obtained through performing micro-arc oxidation on magnesium alloy consisted of Mg, Mg2SiO4, MgO, and MgCr2O4 based on analysis of X-ray diffraction (XRD), and scanning electron microscopy (SEM). Among which, MgCr2O4 was the colouring salt; there were something in the lamellar, pit, and convex forms found on the surface of the coating. The coating consisted of a porous, and a compact, layer from the outside to the inside. As demonstrated, the colour of the coating depended on the K2Cr2O7 concentration: it became gradually deeper with the addition of K2Cr2O7 and the increasing micro-arc oxidation time. The corrosion resistance and hardness of the green coating were greater than that of the matrix.</abstract>

Micro-arc oxidation was applied to AZ91D magnesium alloy by taking K2Cr2O7 as the colouring salt in the silicate system. It was shown that the green coating obtained through performing micro-arc oxidation on magnesium alloy consisted of Mg, Mg2SiO4, MgO, and MgCr2O4 based on analysis of X-ray diffraction (XRD), and scanning electron microscopy (SEM). Among which, MgCr2O4 was the colouring salt; there were something in the lamellar, pit, and convex forms found on the surface of the coating. The coating consisted of a porous, and a compact, layer from the outside to the inside. As demonstrated, the colour of the coating depended on the K2Cr2O7 concentration: it became gradually deeper with the addition of K2Cr2O7 and the increasing micro-arc oxidation time. The corrosion resistance and hardness of the green coating were greater than that of the matrix.

The technology of preparing green coating by conducting micro-arc oxidation on AZ91D magnesium alloy

Lanzhou University of Technology, State key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou 730050,

Lanzhou University of Technology, Key Laboratory of Non-ferrous Metal Alloys, The Ministry of Education, Lanzhou 730050,

Polish Journal of Chemical Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Micro-arc oxidation was applied to AZ91D magnesium alloy by taking K2Cr2O7 as the colouring salt in the silicate system. It was shown that the green coating...

The technology of preparing green coating by conducting micro-arc oxidation on AZ91D magnesium alloy

Published Online: Dec 30, 2016

Page range: 36 - 40

DOI: https://doi.org/10.1515/pjct-2016-0068

Keywords
magnesium alloy, micro-arc oxidation, coating

© 2016 Sheng Wang et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The technology of preparing green coating by conducting micro-arc oxidation on AZ91D magnesium alloy

Published Online: Dec 30, 2016

Page range: 36 - 40

DOI: https://doi.org/10.1515/pjct-2016-0068

Keywordsmagnesium alloy, micro-arc oxidation, coating

© 2016 Sheng Wang et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
magnesium alloy, micro-arc oxidation, coating