Why do aluminum alloy casings in humid environments all need surface treatment

 

The corrosion of aluminum alloy casings in a humid environment is a widespread problem. To protect the aluminum alloy shell from erosion in a humid environment, surface treatment is indispensable. This article will explore why aluminum alloy casings in humid environments all need surface treatment and introduce several common surface treatment methods.

In a humid environment, aluminum casings are prone to problems such as oxidation, corrosion and contamination. First of all, the oxygen in the humid air will undergo a chemical reaction with the aluminum alloy, forming a dense and stable oxide layer. This layer of oxide can provide a certain degree of protection, but when exposed to a humid environment for a long time, it may also become unstable and is prone to erosion by other substances, such as salts and acidic substances.

 

Secondly, in a humid environment, there are various pollutants, such as salts, acidic substances and organic matter, etc. These contaminants will adhere to the surface of the aluminum alloy and react with it, causing surface corrosion and damage. Especially in Marine environments, seawater contains a large amount of salt, which will accelerate the corrosion rate of aluminum alloy casings.

To solve these problems, surface treatment is a necessary and effective method. Common surface treatment methods include anodizing and spraying, etc.

Anodizing is a method commonly used for surface treatment of aluminum shells. It forms a dense oxide layer with high hardness and wear resistance on the surface of aluminum alloy by applying an electric current in the electrolyte. This oxide layer can not only enhance the corrosion resistance of the aluminum alloy shell, but also increase its wear resistance and decorative effect.

Spraying is a method of applying a special coating on an aluminum alloy shell to form a protective layer. This kind of coating has excellent waterproof, dustproof and anti-pollution effects, and different colors and glossiness can be selected as needed.

In conclusion, in a humid environment, it is very important to carry out appropriate surface treatment during the manufacturing process in order to protect the aluminum alloy shell from problems such as oxidation, corrosion and contamination. Methods such as anodizing, electroplating and spraying can effectively enhance the weather resistance, wear resistance and decorative effect of aluminum casings, extend their service life and maintain a good appearance.