Microstructure and Corrosion Resistance of Microarc Oxidation Coatings on AZ31 Magnesium Alloy Extrusion Profiles

Jie Ma; Yuan Sheng Yang; Xiu Chun Wang; Jing Zhang; Shuo Liu; Li Kun Jiang; Xi Bin Yi

doi:10.4028/www.scientific.net/AMR.557-559.1993

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 557-559Microstructure and Corrosion Resistance of...

Microstructure and Corrosion Resistance of Microarc Oxidation Coatings on AZ31 Magnesium Alloy Extrusion Profiles

Abstract:

Microarc oxidation coatings were prepared on the surface of AZ31 magnesium alloy profiles. Oxidation time of the coatings was between 5min-10min. The phase structure, surface morphology and corrosion resistance of the coatings were investigated using SEM, XRD, copper sulfate spot test and polarization curve test. The results indicate: the main phase compositions of the microarc oxidation coatings are MgO, Mg₂SiO₄ and MgSiO₃; with increasing pulse voltage, the micropore diameter of the coating surface becomes larger, the micropore number reduces and the coating surface roughness increases; the corrosion current density of magnesium alloy reduces significantly after microarc oxidation treatment. The pulse voltage of microarc oxidation should be controlled between 240V-360V to obtain the best corrosion resistance.

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Advanced Materials Research (Volumes 557-559)

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1993-1997

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https://doi.org/10.4028/www.scientific.net/AMR.557-559.1993

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July 2012

Authors:

Jie Ma, Yuan Sheng Yang, Xiu Chun Wang, Jing Zhang, Shuo Liu, Li Kun Jiang, Xi Bin Yi

Keywords:

Corrosion Resistance, Magnesium Alloy, Micro-Arc Oxidation, Microstructure, Polarization Curve

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