The cause of the hole caused by aluminum profile:

1) The aluminum profile workpiece is not washed completely after alkali washing. If the lye into the hole cannot be cleaned and neat during alkali washing, the lye will be promoted to flow out of the hole after air oxidation treatment, resulting in erosion of the air oxide film around the hole

2) The hole around the aluminum profile workpiece has a live. When the aluminum profile taps the screw hole, the operator is still coated with active to moisturize, if the alkali wash in the lack of demulsifier, active is not able to get rid of.

Solution:

1) in the alkali wash before the car with gasoline scrub again, 7050 aluminum alkali lotion should be added to the demulsifier.

2) The workpiece should be cleaned and neat after alkali washing.

1, prohibit aluminum in transportation loose loading, resulting in knock injury.

2. When the surface layer of aluminum profile is corroded and damaged, it should be cleaned immediately. Scaling can be cleaned with a soft rag dipped in ethanol and then cleaned with water.

3. According to the conditions adopted, aluminum doors and Windows should be cleaned on time.

4, should be used with lubricating fluid or neutral detergent warm water cleaning, can not be used acid alkaline or alkaline detergent.