Hexavalent chromium (spray) - aluminum wheel

Hexavalent chromium spray was once used for aluminum wheel surface treatment, but due to its toxicity and environmental hazards, it is now rarely used. The following is a related introduction:

Basic Information

The hexavalent chromium in hexavalent chromium spray refers to the hexavalent compound of chromium, usually in the form of chromic acid, dichromate, etc. In the treatment of aluminum wheels, it is a chemical substance used to form a protective film.

How it works

The principle of hexavalent chromium spray forming a protective film on the surface of aluminum wheel hub is based on the chemical reaction of chromate. When the spray contacts the surface of aluminum wheel hub, chromate ions react with aluminum to form a dense chromate conversion film on the aluminum surface. This film can prevent oxygen, water and other corrosive substances from contacting aluminum, thereby preventing the aluminum wheel hub from corroding. At the same time, it can also improve the hardness and wear resistance of the aluminum wheel hub surface and enhance its ability to resist external wear and scratches. In addition, the chromate conversion film also has good adhesion, which can provide a good foundation for subsequent painting or other surface treatments and improve the bonding strength between the coating and the aluminum wheel hub substrate.

advantage

Excellent corrosion resistance: It can effectively block external corrosive media, significantly extend the service life of the aluminum wheel hub, and enable it to maintain good performance in various harsh environmental conditions such as humidity, salt spray and other environments.

Good wear resistance: It can improve the hardness of the aluminum wheel surface, reduce the wear caused by friction, collision, etc. in daily use, and maintain the appearance and performance of the wheel.

Enhance coating adhesion: Provides an ideal base layer for subsequent coatings, allowing the coating to better adhere to the surface of the aluminum wheel hub, improving the durability and decorativeness of the coating.