Oxidation Treatment On Aluminum Alloy Parts After CNC Machining

Aluminum alloy is actually a raw material with strong corrosion resistance, but the surface of aluminum alloy will produce oxygen oxidation when it encounters oxygen, and its corrosion resistance and bran resistance will gradually be eliminated after a long time. In addition, aluminum alloys are particularly sensitive to acids. When encountering acid, it will damage the surface layer of aluminum alloy. Then we need to oxidize again and add another layer on the surface to improve the corrosion-resistant protective film on the surface.

After the surface of aluminum alloy precision parts is anodized, its corrosion resistance, hardness standard, wear resistance, insulation performance and high temperature resistance are all greatly improved. The porous structure on the surface of the anodized aluminum alloy film is easy to absorb dyes and colored substances, so it can be colored to improve its ornamental value. After the oxide film is treated with boiling water, high temperature steam or nickel salt, its corrosion resistance and wear resistance can be further improved.

Anodizing treatment technology is widely used in the metal surface treatment of aluminum alloy products, and its use in manufacturing can be roughly divided into the following categories:

1. Avoid corrosion of aluminum alloy parts
Because the film obtained by anodic oxidation treatment has been properly sealed, it has very good stability in the atmospheric environment. Regardless of whether the oxide film is obtained from sulfuric acid solution, oxalic acid solution or chromic acid solution by normal processing technology, its corrosion resistance is very good, such as aluminum pots, pots, washing machine liners, etc. The chromic acid oxidation method is especially suitable for aluminum welded parts and riveted parts.

2. Protective decorative design effect on aluminum alloy CNC machined parts
The oxide film has high transparency, and the oxide film can absorb various organic dyes or inorganic pigments. On the oxide film, various bright and colorful color combinations and pattern designs can be obtained. In addition, the birth of some new technologies and processes in recent years, such as one-time oxidation and multiple coloring, wood grain pattern design, oxidation offset printing, porcelain oxidation, etc., has made the appearance design of aluminum alloy parts more individual. Beautiful and pleasing to the eye, this color film is a decorative design layer and also an anti-corrosion layer, such as lighters, gold pens and various handicrafts.

3. It can add hard wear-resistant layer to aluminum alloy parts
In sulfuric acid or oxalic acid solution, a thick and hard film can be obtained according to the processing standard of anodizing treatment. The porosity and adsorptive properties of the film can be exploited to store selective oil, which can be reasonably effective as a criterion for operation in frictional environments. At the same time, it has the characteristics of lubrication and wear resistance, such as the cylinders of automobile engines and the piston rods of cars and agricultural vehicles.