I recently made a product that failed the hundred-square test. The material is magnesium alloy. Process: electrophoresis + black primer + colorless rubber topcoat. Please give me some advice!

This problem is serious! First, you electrophorese the magnesium alloy workpiece black first, and you can ensure that the electrophoresis and the black primer you want to bake can be closely bonded and combined. Second, the temperature of black primer is too high. For example, acrylic paint is generally 140°+-10°, which is very high, and it is easy to cause brittleness and discoloration. Third. Rubber topcoat? Is it leather paint or something? The temperature is too high.

It is recommended that if you must add electrophoresis, you should first apply a thin primer, then spray a layer of powder paint for bonding, then black primer, and then topcoat. It is best to use the same paint factory. Configuration can achieve adhesion between layers of paint. Note that the total thickness of these paints should not exceed 80um, otherwise it will not be easy to pass through hundreds of grids.