Methods Of Surface Treatment for Aluminum Die Casting Parts

Methods Of Surface Treatment Of Aluminum Alloy Die Casting Parts

The Surface treatment of Aluminum Alloy Die casting parts is divided into pre-treatment and Post-treatment.The purpose of pre-treatment is to remove the surface oxide scale and greasy dirt, by that means increasing the adhesion of post-treatment and improving the appearance effect.The most commonly methods of pre-treatment are shot peening, sand blasting and phosphating. While Post-treatment generally uses spraying, oxidation, electroplating, electrophoresis. Other surface treatment methods only apply to products with special requirements for cost reasons.

From the cost point of view, the pre-treatment in turn are shot peening→sand blasting→phosphating→polishing, spray→ electrophoretic coating→oxidation→plating.After phosphating it can only be sprayed, electrophoresis, but can not be oxidized, electroplating.

In terms of decoration and anti-corrosion,the pre-treatment in turn are polishing→phosphating→sand blasting→shot blasting, oxidation→ plating→ spraying→electrophoretic coating.The shell of the automobile engine is generally treated by shot blasting and spraying.