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《Surface Technology》 2007-04
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Effect of Final Voltage on Corrosion Resistance of MB8 Mg Alloys by Micro-arc Oxidation

ZHAO Qing,ZHANG Zhi-you,CHEN Ning(Nanchang Institute of Aeronautical Technology,Nanchang 330063,China)  
With scanning electron microscopy(SEM),X-ray Diffraction(XRD),potentiodynamism polarization curves,electronmicroscopy impeclance spectroscopy(EIS),corrosion resistance of membrane produced at different final voltage on MB8 magnesium alloy substrates by micro-arc oxidation (MAO) technique had been investigated.The results show: the higher the final voltage,the thicker the membrane;micro sparking oxide coating exhibites better performance of compact,homogeneous and high resistance comparing with arc-oxide coatings in which pore diameter augment and micro-defect multiply of ceramic coatings.Thereby comes to the conclusion that the membrane level erosion codetermines with membrane thickness and final voltage,the erosion of membrane at micro spark discharge last stage excels than arc discharge membrane.
【Fund】: 江西省自然科学基金(0450099)
【CateGory Index】: TG174.451
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