Product Categories
Contact Us
Tel: 86 (0)371-86541576
E-mail: sales@mingtai-al.com
Gongyi City,Henan Province,China
You are here: Home > News >
The detection methods for the oxide film of aluminum alloys
- 2018-03-15 13:30 -
The oxide film is very important for aluminum alloys, it can protect the aluminum alloys from corrosion, rust, etc. Here are some detection methods for oxide film.
1.check the color
The color of pure aluminum oxide film is milky white, the casted aluminum and mixed aluminum is gray-black. The aluminum surface without oxide film is bright white with a high transparency, some also attach hanging cream of pink or gray black color.
2. resistance
The aluminum alloys that formed a layer of oxide film has curtain resistance, and it is on-conductive under an ordinary voltage.
aluminum sheet price
3. scratch
The aluminum alloys that formed a layer of oxide film has a hard surface, it is fail to use needle to scratch on it. On the contrary, the surface of aluminum alloys which the oxide film is not formed is soft, and there are resistance and scratches when scratching with the needle.
4.sound
When we knock the aluminum alloys that formed a layer of oxide film, its sound is crisp, but the sound of aluminum alloys which is not formed a layer of oxide film is muffled.
5. coloration
The aluminum alloys that formed a layer of oxide film is easy to color up in the staining solution.