What are the causes of surface defects, dull color and rough surface of aluminum profiles? It can be mainly divided into two reasons. One is that the raw material aluminum ingots used are impure, and the profiles are extruded from aluminum rods doped with scrap aluminum. The second is caused by improper operation in the production process. The specific reasons are as follows: The raw materials used are doped with scrap aluminum Uneven ratio of raw materials in the production process During the production process, the acid content of the bath liquid is too high, and the acid corrosion causes the surface to be rough If the copper content in Read more