Research on Preparation and Corrosion Resistance of Ca-P Coating on Mg-Zn-Zr Alloy Surface
The Ca-P biological coatings were preparedby combining two-step anodic oxidation and chemical deposition method on the surface of Mg-3wt％Zn-0.8wt％oZr alloy in the solution with Ca/P ratio of 1.67.The XRD,SEM,scratch testerand optical microscope were used to characterize and analyze the phase composition,surface morphology,thickness and adhesion of the coating,and the corrosion resistance of the coating material was measured by electrochemical worksta-tion.The results showed that Ca-P coatings were formed on Mg-Zn-Zr alloy by anodic oxidation and chemical deposition,and the main component of coatings were CaHPO4,CaHPO4·2H2O and Ca3(PO4)2.The microstructure of the formed Ca-P coating was compact and uniform and the coating had the best adhesion with the substrate under the conditions of depo-sition time of 48 h,and the corrosion potential of magnesium alloy could reach-1.181 V,and the corrosion rate was obvi-ously reduced,thus achieved the purpose of improving the corrosion resistance of the magnesium alloy matrix.
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