科研之友
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摘要
In this work, a galvanized zinc coating with a Cu interlayer was successfully coated onto AZ31 magnesium alloy. The microstructure and corrosion resistance of the zinc -coated magnesium alloy were then investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), optical microscopy (OM), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization testing. The results revealed that a dense pure zinc coating with a thickness of approximately 100 mu m was coated on the magnesium alloy surface. A reaction/diffusion layer formed at the interface between the Cu interlayer and the magnesium alloy, implying that the bond between the galvanized zinc coating and the magnesium alloy was metallurgical. Electrochemical tests in a NaCl solution revealed that surface modification of the magnesium alloy with the zinc coating could significantly enhance the corrosion resistance of the magnesium alloy. In addition, the galvanic corrosion between the galvanized zinc coating and the magnesium alloy was also investigated and discussed.
