Surface chemical plating and corrosion resistance of magnesium alloy building templates
A single Sn film,single Zn film and a composite Sn-Zn film were prepared on the surface of magnesium alloy building formwork by electroless plating.The effects of pH,temperature and film number on the micromorphology and electrochemical properties of magnesium alloys were analyzed.The results showed that for a single film,both the single Sn film prepared at pH=6.0 and temperature of 75 ℃ and the single Zn film prepared at pH=9.5 and temperature of 75 ℃ had good film-forming quality;When the number of film layers was 9,the magnesium alloy matrix can be covered completely by Sn-Zn composite film and the quality of the film layer was good.Compared with the magnesium alloy matrix,the corrosion potential of the single Sn film,single Zn film,and the composite Sn-Zn film all showed a positive shift,and the corrosion current density decreased to varying degrees.The corrosion potential of composite Sn-Zn film was the most positive,and the corrosion current density was the smallest.Chemical plating of single Sn film,single Zn film,and composite Sn-Zn film on the surface of magnesium alloy substrate can improve the corrosion resistance of magnesium alloy,and the protective effect of composite Sn-Zn film on the substrate was better than that of single Sn film and single Zn film.
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