Method for anodizing aluminum alloy workpiece, method for surface treating aluminum alloy workpiece, and anodizing solution mixes

Abstract

A method for surface treating an aluminum alloy workpiece having zinc and magnesium includes: providing the aluminum alloy workpiece; polishing the aluminum alloy to achieve a mirror effect; degreasing the aluminum alloy workpiece; stripping a black film formed on the aluminum alloy workpiece; anodizing the aluminum alloy workpiece in an anodizing solution which includes acidic solution and an additive with a concentration of 0.5 mg/L to 25 g/L to form an oxidation film on the surface of the aluminum alloy workpiece, wherein the additive including at least one compound selected from a group consisting of adipic acid, 1,2,3-Benzotriazole, oxalic acid, sodium malate, and glycerin; and sealing the aluminum alloy workpiece. This disclosure further provides an anodizing solution applied in the method for surface treating an aluminum alloy workpiece and a method for anodizing the aluminum alloy workpiece using the same.

What is claimed is: 
     
         1 . An anodizing solution for an aluminum alloy workpiece having zinc and magnesium, the anodizing solution comprising:
 a sulfuric acid with a mass concentration from about 150 g/L to 230 g/L; and   an additive with a mass concentration from about 0.5 mg/L to 25 mg/L;   wherein the additive comprises at least one compound selected from a group consisting of adipic acid, 1,2,3-Benzotriazole, oxalic acid, sodium malate, and glycerin.   
     
     
         2 . A method for anodizing an aluminum alloy workpiece having zinc and magnesium, the method comprising:
 anodizing the aluminum alloy workpiece using an anodizing solution, the anodizing solution comprising an acid solution and an additive with a mass concentration from about 0.5 mg/L to 25 mg/L;   wherein the additive comprises at least one compound selected from a group consisting of adipic acid, 1,2,3-Benzotriazole, oxalic acid, sodium malate, and glycerin.   
     
     
         3 . The method as claimed in  claim 2 , wherein the acid solution is a sulfuric acid solution with a mass concentration from about 150 g/L to 230 g/L, a period of the anodizing process is from about 20 minutes to 50 minutes, a temperature of the anodizing process is from about 18 degrees Celsius to about 26 degrees Celsius, and a voltage of the anodizing process is from about 6 volts to about 10 volts. 
     
     
         4 . A method for surface treating an aluminum alloy workpiece having zinc and magnesium , the method comprising:
 supplying the aluminum alloy workpiece;   polishing a surface of the aluminum alloy workpiece such that a surface of the aluminum alloy workpiece achieve a mirror effect;   degreasing the aluminum alloy workpiece;   anodizing the aluminum alloy to form an oxidation film on the surface of the aluminum alloy workpiece using an anodizing solution which comprising an acid solution and an additive with a mass concentration from about 0.5 mg/L to 25 mg/L, the additive comprising at least one compound selected from a group consisting of adipic acid, 1,2,3-Benzotriazole, oxalic acid, sodium malate, and glycerin; and   sealing the aluminum alloy workpiece using a sealing solution.   
     
     
         5 . The method as claimed in  claim 4 , further comprising stripping a black film formed on the surface of the aluminum alloy workpiece after degreasing the aluminum alloy workpiece. 
     
     
         6 . The method as claimed in  claim 5 , wherein the black film is stripped using a sulfuric acid solution, a period of stripping the black film is in a range from about 20 seconds to 120 seconds, and a temperature of stripping the black film is room temperature. 
     
     
         7 . The method as claimed in  claim 4 , wherein the acid solution of anodizing the aluminum alloy workpiece is a sulfuric acid solution with a mass concentration from about 150 g/L to about 230 g/L, a period of anodizing is in a range from about 20 minutes to about 50 minutes, a temperature of anodizing is in a range from about 18 degrees Celsius to about 26 degrees Celsius, and a voltage of anodizing is in range from about 6 volts to about 10 volts. 
     
     
         8 . The method as claimed in  claim 4 , wherein a period of degreasing the aluminum alloy workpiece is in a range from about 3 minutes to 5 minutes, a temperature of degreasing is in a range from about 50 minutes to about 60 minutes, and a degreasing solution comprises sodium phosphate with a mass concentration of 40 g/L to 70 g/L. 
     
     
         9 . The method as claimed in  claim 4 , wherein a period of sealing the aluminum alloy workpiece is in a range from about 15 minutes to about 20 minutes, a temperature of the sealing is in a range from 90 degrees Celsius to about 95 degrees Celsius, and a sealing solution comprises nickel acetate with a mass concentration of 5 g/L to 10 g/L. 
     
     
         10 . The method as claimed in  claim 4 , wherein aluminum alloy is washed in water and dried after being sealed.