Why the Pickling Degree of Aluminum Castings Should be Controlled and Its Polishing Requirements

1. Is the pickling of aluminum castings well controlled? And, is it necessary to apply primer before painting?

Pickling of aluminum castings must be well controlled, because excessive pickling will lead to corrosion problems on the surface of aluminum castings, but insufficient pickling will not achieve the pickling effect. Therefore, it is required to control and avoid these problems. Before painting, the casting should be painted with phosphating primer, so that the top coat can have a good painting effect.

2. After high temperature, will aluminum castings have expansion pores?

After high temperature, aluminum castings will not have expansion pores, if there are no bubbles in the casting process. However, if bubbles are generated during the casting process, this problem may occur. Therefore, we should have a correct understanding of this point and not make mistakes.

3. Are there specific requirements for polishing aluminum castings?

There are basic requirements for polishing aluminum castings from a professional perspective. To be specific, one fine polishing shall be adopted and the polishing shall be complete without any dead corner or omission. In this way, the surface of the casting can be smooth and the glossiness is good, and further, the rust corrosion and other problems can be avoided.