[Introduction]The corrosion resistance of rare earth based magnesium alloy VW63Z needs to be improved.[Method]A composite film was prepared on the surface of VW63Z magnesium alloy via microarc oxidation(MAO)in an electrolyte comprising KF 35-40 g/L and NaOH 2-8 g/L at voltage 350-380 V,current density 5.0-6.0 A/dm2,frequency 60-100 Hz,and duty cycle 40%-50%for 10-15 minutes followed by electrophoretic deposition(EPD)with Nippon POWERNICS 301(ZY)GRAY paint at a voltage of 80-100 V for 3-4 minutes.The properties of the composite film were examined by morphology observation,thickness measurement,hardness test,water resistance test,acid resistance test,alkali resistance test,adhesion test,and neutral salt spray test.[Result]The microarc oxidation-electrophoretic deposition composite film is compact in structure,with a thickness as high as 38.6-41.8 μm,a pencil hardness at least 8H,0-grade adhesion,good resistance to water,acid,and alkali,and neutral salt spray resistance up to 1632 hours.[Conclusion]The combination of microarc oxidation and electrophoretic deposition can effectively improve the corrosion resistance of VW63Z magnesium alloy.
rare earth based magnesium alloymicroarc oxidationelectrophoretic depositionhardnessadhesioncorrosion resistance
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