Abstract
Zn–Ni alloy coatings were plated on AZ91 magnesium alloy using a pulse potential electrodeposition method after zinc immersion and Zn–Cu plating. The density and frequency of electric current, deposition time and t on / t off have large effects on chemical composition, thickness of the Zn–Ni coatings. The Zn–Ni coatings provide very good corrosion protective function to inner AZ91 magnesium alloy. The good corrosion resistance of Zn–Ni coatings is attributed to the existence of the γ-phase and the homogeneous and compact structure of the coatings. Chromating treatment can further improve the corrosion resistance of Zn–Ni coatings.
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