[Introduction]Suitable surface treatment of magnesium alloy make it possible to form a coating with excellent conductivity and corrosion resistance,meeting the application requirements of electronic communication.[Method]A conductive Mo-Ti-Mn(code as MTM)coating was prepared on the surface of AZ91D magnesium alloy by chemical conversion in an electrolyte primarily composed of(NH4)2MoO4,H2TiF6,and KMnO4.The effects pretreatment method and KMnO4 concentration in electrolyte on the properties of MTM coating i.e.appearance,morphology,composition,corrosion resistance,and conductivity were studied.[Result]The MTM coating formed on the AZ91D magnesium alloy pretreated by sanding,alkaline cleaning,pickling,and surface conditioning successively by conversion with 4.2 g/L of KMnO4 had the largest area fraction of β-phase conductive spots,good corrosion resistance,and the best conductivity(as shown by band gap 2.556 eV and electric contact resistance 0.428 Ω/in2).[Conclusion]The MTM film prepared by the given process has a good application prospect in electronic communication due to its excellent corrosion resistance and conductivity.
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