Surface oxidation treatment process of aluminum parts

During the processing of aluminum parts, some choose anodizing surface treatment process. Let’s see what kinds of process options are generally available for anodizing surface treatment:

1. Aluminum materials can be divided into 5052, 5055, 6061, 6063, 7075 and other different materials. Surface sandblasting + oxidation: sandblasting includes 80#, 100#, 120#, 180# and so on. The higher the value, the finer the sandblasting, but at the same time, the worse the masking effect on surface machining defects. Oxidation after sandblasting will cover scratches, bumps and knife marks during machining;
2. Simple oxidation: oxidation can be divided into natural color oxidation, colored oxidation, or multi-color oxidation according to customer requirements, such as black, red, yellow, green, etc. simple oxidation has high requirements for machining quality. If there are knife marks and scratches after machining, they will be exposed after oxidation;
3. The film thickness, treatment time and process of aluminum oxidation can also be divided into bright oxidation, semi bright oxidation and matte oxidation (frosted surface). It is particularly emphasized here that matte oxidation has high requirements for material density and composition of aluminum. If there are material density, purity, composition defects and defects, serious surface quality defects will appear after oxidation, such as pores, black spots Oxidation spots, etc. Therefore, under the background of the current domestic aluminum quality situation, customers are not recommended to choose matte oxidation. If similar surface effects are required, the oxidation effect of spraying fine sand + semi bright is relatively close;
4. There are also electrochemical reaction and chemical reaction. Oxidation can also be divided into anodic oxidation and conductive oxidation. Anodic oxidation is an electrochemical reaction, which generally takes a long time. The product surface has a film thickness of 10-15 microns, which is ideal in terms of wear resistance and hardness, but it is not conductive. Conductive oxidation is a pure chemical reaction, A very thin film is coated on the surface of the workpiece to only prevent atmospheric oxidation and corrosion. Because the film is very thin, it does not affect the conductivity of the workpiece;

The above is about the surface oxidation treatment process of aluminum parts processed by CNC. Thank you for your attention!

ken. tang@chengcg.com