Corrosion Resistance of Fe-based Amorphous Coating on Magnesium Alloy Surface in Simulated Body Fluid
Fe78Si9B13 amorphous coating was deposited on the surface of ZK60A magnesium alloy by high velocity oxy-fuel(HVOF)thermal spraying.The microstructure of the coating was characterized,and the corrosion behavior of the amorphous coating in SBF(simulated body fluid)was investigated by electrochemical potentiodynamic polarization and impedance measurement.The results indicate that the coating presents dense and uniform with well bonding with the substrate,as well as high amorphous proportion and low porosity.The potentiodynamic polarization test results reveal that the corrosion rate of the coating is far lower than that of the magnesium alloy matrix,and lower than the upper limit of the degradation rate of the two stages before bone defect repair.The impedance spectrum analysis results coincide with the polarization curve,and the corrosion resistance of the coating in SBF is significantly higher than that of the magnesium alloy matrix.
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