Method for ceramization of aluminum alloy surface
AssigneeCITIC Dicastal Co., Ltd.
InventorDeyu Han
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Abstract
The present invention provides a method for ceramization of an aluminum alloy surface, comprising the steps of: (1) providing a clean aluminum alloy surface; (2) pre-polishing; (3) etching; (4) polishing; and (5) performing ceramic oxidation. The advantages of the method are as follows: (1) good corrosion resistance, good elasticity and insulation; (2) the coating being similar to plastic, with enamel-like luster and attractive appearance; and (3) good adsorption capacity, capability of being dyed with different colors, and good decorative effect etc.
Claims10
A method for ceramization of an aluminum alloy surface, comprising the steps of:
- (1) providing a clean aluminum alloy surface;
- (2) pre-polishing:
- rinsing the aluminum alloy surface obtained in step 1 in concentrated nitric acid for 1-5 minutes, followed by washing, the concentrated nitric acid being 380-400 g/L;
- (3) etching:
- rinsing the aluminum alloy surface obtained in step 2 in an etching solution for 1-5 minutes, followed by washing, the etching solution containing 45-50 g/L of sodium hydroxide and 45-50 g/L of sodium fluoride, and the temperature being 60-70° C.;
- (4) polishing:
- rinsing the aluminum alloy surface obtained in step 3 in concentrated nitric acid for 1-5 minutes, followed by washing, the concentrated nitric acid being 380-400 g/L;
- and
- (5) performing ceramic oxidation:
- electroplating the aluminum alloy surface in a ceramic oxidation solution for 45-48 minutes, followed by washing, the aluminum alloy surface being an anode, a current density of the anode being 0.5-1.0 A/dm2, a voltage being 28-38V and a temperature being 45-50° C., and the ceramic oxidation solution comprising 36-38 g/L of chromic anhydride and 6-11 g/L of oxalic acid.
Dependencies are inferred from the claim text.