Aluminum alloy and method of anodizing same

Patent metadata

Field	Value
Publication number	US-2017350032-A1
Application number	US-201715686359-A
Country	US
Kind code	A1
Filing date	Aug 25, 2017
Priority date	Apr 9, 2015
Publication date	Dec 7, 2017
Grant date	—

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.

First claim

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.

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Zeng Yuanqing

Classifications

• B08B3/10

  with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration · CPC title

• C25D11/16 Primary

  Pretreatment {, e.g. desmutting} · CPC title

• C22C21/10 Primary

  with zinc as the next major constituent · CPC title

• C23F3/03

  with acidic solutions · CPC title

• B08B3/08

  the liquid having chemical or dissolving effect · CPC title