Abstract
A phosphate-permanganate surface treatment with additives Na2MoO4 and NaF was developed to improve the corrosion resistance and bond strength of magnesium AZ31. The phosphate coatings which have the magnesium phosphate, MgO, Mg (OH)2, MgF2 and a minor of Al2O3, Al(OH)3 Al0.35−0.55Si0.10−0.48P0.13−0.35O2.1−2.2 and, Al0.35Si0.48P0.18O2.2, and Al0.52P0.48O2.2 were formed on the surface of magnesium AZ31. A combination addition of the Na2MoO4 and NaF in the phosphate solution improves the corrosion resistance and bond strength of phosphated magnesium alloys. The optimal contents of NaF and Na2MoO4 are 0.8g/L and 0.5g/L, respectively.
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