Surface coating treatment process for industrial aluminum profiles
There are few sandblasters used for surface treatment of industrial aluminum before painting, and the aluminum surface is relatively smooth. Without surface treatment, the adhesion of the coating to the aluminum surface is low, and the corrosion resistance is also relatively low, sometimes resulting in linear corrosion under the paint film. So the aluminum surface needs to undergo appropriate surface treatment before painting. There are mainly three forms of treatment methods, including electrochemical anodizing, chemical solution oxidation, and phosphating primer. The surface after anodizing or chemical solution oxidation should be coated as soon as possible and not exceed 24 hours. If it exceeds 24 hours, the adhesion will decrease. At this time, phosphating primer can be used as a base or solution treatment can be carried out again. The reason is that the surface of the new anodic oxide film is porous and has good adhesion to organic coatings. If left for a long time, the oxide film will age and reduce adhesion.
The above aluminum surface treatment methods each have their own advantages and disadvantages, and should be adopted according to different needs. In general, using phosphating primer is more convenient, does not require special equipment investment, is easy to construct, and has good efficacy.