decorative metal works near me.What is the reason for the unstable paint spraying of aluminum alloy die castings?

　　The reason for the paint layer peeling off: The main reason for the die cast paint layer is insufficient adhesion between the paint and the die cast part.

　　The adhesion of spray painting on die castings depends on the quality of the pre-treatment before painting. Pre treatment involves preparing appropriate cleaning agents based on the material, not just degreasing.

　　The surface of the die casting has a carbonization film formed by high-temperature carbonization of the release agent, which is not conducive to adhesion and salt spray testing after coating. Therefore, when degreasing, the release agent should be removed and then passivated to meet the test requirements for painting.

　　The influencing factors are as follows:

　　1. The paint and punch oil are not cleaned;

　　2. During the subsequent processing, the cutting oil of the die-casting parts was not cleaned thoroughly;

　　3. The surface oxide layer of the die casting is not treated with activity;

　　4. Poor phosphating process for die-casting parts;

　　5. Paint issues;

　　6. Baking temperature;

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