Aluminum alloy and method of anodizing same

Abstract

An aluminum alloy is described and has compositions with mass percentage content consisting of: 5.0%-5.4% Zn; 0.9%-1.2% Mg; Cu<0.05%; Si<0.05%; Fe<0.1%; Mn<0.05%; Zr<0.1%; Ti<0.05%; other impurities<0.15%; and the remaining composition being Al. An anodizing method of the aluminum alloy described above is described and has: a degreasing treatment, a first black-film stripping treatment, a chemical polishing treatment, a second black-film stripping treatment, an anodizing treatment, a hole filling treatment, and a drying treatment which are performed in turn. The aluminum alloy has a higher strength while eliminating an influence of a formed compound phase on a material texture.

What is claimed is: 
     
         1 . An aluminum alloy, comprising compositions with mass percentage content consisting of: 5.0%-5.4% Zn; 0.9%-1.2% Mg; Cu<0.05%; Si<0.05%; Fe<0.1%; Mn<0.012%; Zr<0.1%; Ti<0.05%; other impurities<0.15%; and a remaining composition being Al;
 wherein a mass ratio of Zn and Mg is between 5 and 6; and   wherein a surface treatment is performed on the aluminum alloy by using an anodizing method.   
     
     
         2 . The aluminum alloy according to  claim 1 , wherein the compositions with mass percentage content are consisting of: 5.15%-5.197% Zn; 0.900%-0.980% Mg; Cu<0.0015%; Si<0.0464%; Fe<0.0990%; Mn<0.0019%; Zr<0.1%; Ti<0.028%; the other impurities<0.15%; and the remaining composition being Al. 
     
     
         3 . An anodizing method of an aluminum alloy according to  claim 1 , comprising: a degreasing treatment, a first black-film stripping treatment, a chemical polishing treatment, a second black-film stripping treatment, an anodizing treatment, a hole filling treatment and a drying treatment which are performed in turn. 
     
     
         4 . The anodizing method of the aluminum alloy according to  claim 3 , wherein the anodizing treatment is performed at a temperature ranging from 18° C. to 20° C., a voltage ranging from 8V to 10V and for a time ranging from 40 mins to 50 mins, and a film thickness after the anodizing treatment ranges from 8 to 10 um. 
     
     
         5 . The anodizing method of the aluminum alloy according to  claim 3 , wherein the chemical polishing treatment is performed at a temperature ranging from 100° C. to 110° C. and for a time ranging from 7 seconds to 15 seconds. 
     
     
         6 . The anodizing method of the aluminum alloy according to  claim 3 , wherein the degreasing treatment is performed at a temperature ranging from 50° C. to 60° C. and for a time ranging from 2 mins to 4 mins. 
     
     
         7 . The anodizing method of the aluminum alloy according to  claim 3 , wherein the first black-film stripping treatment is performed at a room temperature and for a time ranging from 30 seconds to 90 seconds, and the second black-film stripping treatment is performed at a room temperature and for a time ranging from 30 seconds to 90 seconds. 
     
     
         8 . The anodizing method of the aluminum alloy according to  claim 3 , further comprising: a sandblasting treatment prior to the degreasing treatment. 
     
     
         9 . The anodizing method of the aluminum alloy according to  claim 4 , further comprising: a sandblasting treatment prior to the degreasing treatment. 
     
     
         10 . The anodizing method of the aluminum alloy according to  claim 5 , further comprising: a sandblasting treatment prior to the degreasing treatment. 
     
     
         11 . The anodizing method of the aluminum alloy according to  claim 6 , further comprising: a sandblasting treatment prior to the degreasing treatment. 
     
     
         12 . An anodizing method of an aluminum alloy according to  claim 2 , comprising: a degreasing treatment, a first black-film stripping treatment, a chemical polishing treatment, a second black-film stripping treatment, an anodizing treatment, a hole filling treatment and a drying treatment which are performed in turn. 
     
     
         13 . The anodizing method of the aluminum alloy according to  claim 12 , wherein the anodizing treatment is performed at a temperature ranging from 18° C. to 20° C., a voltage ranging from 8V to 10V and for a time ranging from 40 mins to 50 mins, and a film thickness after the anodizing treatment ranges from 8 to 10 um. 
     
     
         14 . The anodizing method of the aluminum alloy according to  claim 12 , wherein the chemical polishing treatment is performed at a temperature ranging from 100° C. to 110° C. and for a time ranging from 7 seconds to 15 seconds. 
     
     
         15 . The anodizing method of the aluminum alloy according to  claim 12 , wherein the degreasing treatment is performed at a temperature ranging from 50° C. to 60° C. and for a time ranging from 2 mins to 4 mins. 
     
     
         16 . The anodizing method of the aluminum alloy according to  claim 12 , wherein the first black-film stripping treatment is performed at a room temperature and for a time ranging from 30 seconds to 90 seconds, and the second black-film stripping treatment is performed at a room temperature and for a time ranging from 30 seconds to 90 seconds. 
     
     
         17 . The anodizing method of the aluminum alloy according to  claim 12 , further comprising: a sandblasting treatment prior to the degreasing treatment. 
     
     
         18 . The anodizing method of the aluminum alloy according to  claim 13 , further comprising: a sandblasting treatment prior to the degreasing treatment. 
     
     
         19 . The anodizing method of the aluminum alloy according to  claim 14 , further comprising: a sandblasting treatment prior to the degreasing treatment. 
     
     
         20 . The anodizing method of the aluminum alloy according to  claim 15 , further comprising: a sandblasting treatment prior to the degreasing treatment.