Effect of Electrolyte Constituent on Morphology and Composition of the Microarc Oxidation Coating on Magnesium Alloy

2018 International Conference of Green Buildings and Environmental Management

土木建筑工程;生态环境科学

Lv, Y.^1 ; Li, J.G.^1 ; Wu, M.Z.^1 ; Zhang, J.Q.^1 ; Sun, P.F.^1 ; Sun, Z.H.^1

School of Materials Science and Engineering, Jiamusi University, Jiamusi

154002, China^1

关键词: AZ91D magnesium alloys;    Coating surface;    MAO coatings;    Maximum thickness;    Micro-arc oxidation coatings;    Microarc oxidation coating;    Morphology and composition;    Sem and xrd;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/186/2/012025/pdf
DOI  :  10.1088/1755-1315/186/2/012025

来源: IOP

【 摘 要 】

Microarc oxidation (MAO) coating was prepared on the surface of AZ91D magnesium alloy in Na2SiO4-NaOH-C3H8O3 based electrolyte. The morphology and composition of the coating with different electrolyte constituent were analyzed by SEM and XRD. The result showed that the MAO coating was composed of loose layer and dense layer. The coating mainly comprised MgO, Mg2SiO4 and MgAl2O4. When the Na2SiO3 concentration was 20g/L, the pores of the coating were very uniform and the coating surface was smooth with homogeneous pore. The coating with addition of NaF to the electrolyte had the maximum thickness of 17∼25μm.