Abstract
A layer containing dicalcium phosphate dihydrate (DCPD) and β-Ca3(PO4)2 was prepared on magnesium alloy by hydrothermal treatment of micro-arc oxide (MAO) layer. The biocorrosion resistance of the oxide layers before and after hydrothermal treatment was analyzed by anodic polarization and electrochemical impedance spectroscopy (EIS) in Hank’s solution. The prepared MAO layers consisted mainly of MgO and MgAl2O4, and Ca and P inside the oxide layers existed with amorphous phase. Hydrothermal treatments not only made the amorphous Ca and P change into DCPD and β-Ca3(PO4)2 crystals, but also improved the biocorrosion resistance of magnesium alloys, especially the pitting corrosion resistance.
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