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the cause of dark spots on the surface of aluminum sheet metal

the cause of dark spots on the surface of aluminum sheet metal -电子游戏平台

 due to insufficient air cooling at the exit of the extruder, the aluminum sheet metal contacts the pendulum bed at a higher temperature, and the cooling rate of the contact portion is different at other positions, and a coarse mg2si phase is precipitated,the part turns black after the anodizing treatment.

solution
 

1. strengthen the air-cooling strength to avoid the interval between the profile of the pendulum bed being too small and to ensure the temperature gradient of the air-cooling; 

2. adopting a combination of atomized water cooling and air cooling to completely eliminate dark spots.