Under the atmospheric conditions, the aluminum alloy sheet immediately forms a natural oxide film on its surface. This oxide film is very thin, generally in the range of 0.005 to 0.015 micron, which is easily broken, and quickly dissolves under acid and alkaline conditions.
To improve its corrosion resistance and extend life service, aluminum alloys often have to undergo corresponding surface treatment. Through proper surface oxidation treatment, the thickness of the anodized film of anodized aluminum sheet can reach tens to hundreds of micrometers, which not only has good mechanical properties and corrosion resistance, but also has strong adsorption properties.
Anodizing can be divided into ordinary anodizing and hard anodizing. Of them, the ordinary anodizing methods mainly include sulfuric acid anodizing, chromic acid anodizing, oxalic acid anodizing, phosphoric acid anodizing, etc. The improved anodizing process includes:
1. Wide temperature rapid anodizing technology
2. Boric acid-sulfuric acid anodizing process
3. High voltage anodization of aluminum in chromic acid
4. Constant pressure anodization of aluminum in phosphoric acid
5. Rapid oxidation of high concentration acid plus nickel sulfate
The methods of hard anodizing are:
1. Sulfuric acid hard anodizing method
2. Mixed acid hard anodizing at room temperature
3. Pulse hard anodizing method
4. Cast aluminum alloy hard anodizing method
5. Low-pressure hard anodizing method
The anodized aluminum plate got by hard anodizing at constant current has better performance in electrolytic coloring process. The color film has good wear resistance, light resistance, heat resistance, and chemical resistance, which is widely used in modern buildings.
As a big anodized aluminum sheet supplier, Haomei Aluminum has mature anodizing technology to satisfy your special need. Welcome to inquire anodized aluminum sheet price from us directly.