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Aluminum die-casting surface treatment is divided into pre-treatment and post-treatment, pre-treatment is to remove surface oxidation, and oil increases the adhesion of post-treatment and improves the appearance of the effect. Aluminum die-casting surface pretreatment most commonly used are shot blasting, sandblasting and phosphating 3, post-treatment is generally used spraying, oxidation, electroplating, and electrophoresis 4. Other surface treatment methods due to cost reasons are only applied to products with special requirements.