The Research on Anticorrosion and Abrasion Behavior in Corrosive Medium of Micro-Arc Oxidation Film on Magnesium Alloy
In the sodium silicate electrolyte system, the uniform ceramic films formed on AZ91D magnesium alloys were obtained by the pulse power when the current density is 40mA/cm2. The morphology, phase composition, anticorrosion and abrasion resistance behaviors in corrosive medium were studied scanning electron microscopy (SEM). The results show that Micro-arc oxidation film is of double-layer structure (loose layer and compact layer), uniform surface and local cracks. Micro-arc oxidation treatment enhanced the anticorrosion of magnesium alloy. The corrosion potential of micro-arc oxidation film is more increased by 94mV than that of the magnesium alloy substrate. The abrasion of the film will be reduced in corroding medium.
B. Y. Lou et al., "The Research on Anticorrosion and Abrasion Behavior in Corrosive Medium of Micro-Arc Oxidation Film on Magnesium Alloy", Key Engineering Materials, Vols. 474-476, pp. 123-126, 2011