Abstract
Ceramic coatings were fabricated on a new casting aluminum alloy during micro-arc oxidation by mixing nano-SiO2 into the phosphate electrolyte. The effects of nano-SiO2 in electrolyte on thickness, hardness and microstructure of the ceramic coatings were analyzed. The results show that nano-SiO2 is deposited on the surface layer of the ceramic coatings in micro-arc oxidation process. The compactness of the coatings is thus improved. Both the thickness and hardness of the ceramic coatings increase a lot. The optimal addition amount of nano-SiO2 in the electrolyte is 3g/L
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