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Effect of Molybdate Conversion Coating of Magnesium Alloy Reinforced by Micro-arc Oxidation
Hongda Zhu,Xuetian Li,Xiurong Guan,Zhongcai Shao 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In order to enhance the corrosion resistance of molybdate conversion coating, the molybdate coating is subjected to micro-arcoxidation treatment in electrolyte with Na2SiO3as a main salt. The electrochemical behavior and corrosion weight loss ofdifferent coating were studied. The surface morphology, element composition, roughness and phase composition of differentcoatings were analyzed by SEM, EDS, laser confocal microscopy and XRD, the growth process of different micro-arcoxidation coatings was explored. The results shows that the arcing voltage of the molybdate coating enhanced by micro-arcoxidation is significantly reduced, the corrosion potential is shifted to the right, and the corrosion weightlessloss of thecoating is the lowest, compared with the molybdate coating and the micro-arc oxidation coating. Micro-arc oxidation on thesurface of the molybdate coating is beneficial to the formation of MgAl2O4and the production of new phase is MoSi2,whichcan better improve the corrosion resistance of the molybdate coating. The micro-arc oxide coating does not form a ceramicfilm with a pore structure at the moment of arcing. As the micro-arc oxidation time prolongs, the ceramic film is graduallyformed. When the time reaches 60 s, the ceramic film is completely formed.
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