Closed treatment of Aluminum anodizing

Closed treatment is one of the treatment processes after phosphating of steel or aluminum anodizing. Used to fill and close the pores of the phosphating film or oxide film to improve corrosion resistance, insulation, and increase aesthetics. After aluminum and its alloys are anodized, no matter whether they are colored or not, they need to be closed in time. The purpose is to fix the dye in the micropores to prevent leakage, and at the same time improve the wear resistance, light resistance, corrosion resistance and Insulation. The Closed methods include hot water Closed method, steam Closed method, dichromate Closed method, hydrolysis Closed method and filling Closed method.


Generally, after the steel parts are phosphatized and the aluminum parts are anodized, they should be immersed in dichromate solution or spindle oil, or coated with varnish and magnetic lacquer, respectively, and then closed. Phosphating parts can also be sealed with oil. Anodized aluminum and its alloy parts can also be immersed in various organic dye solutions such as alizarin, Congo red, direct blue, direct green or aniline black for dyeing and Closed

Metal Closed treatment is an important measure to make up for the defects of high porosity and high adsorption force on the surface anodic oxide film. Therefore, regardless of whether the oxide film is dyed or not, it should be closed in time to improve the corrosion resistance and light resistance of the parts , Wear resistance and insulation. The Closed treatment technology includes: dichromate Closed method, water and Closed method, hydrolyzed salt Closed method and organic matter Closed method.

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