Aluminum alloy and method of anodizing same

Patent metadata

Field	Value
Publication number	US-10626517-B2
Application number	US-201615521992-A
Country	US
Kind code	B2
Filing date	Apr 8, 2016
Priority date	Apr 9, 2015
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

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 anodizing method of an aluminum alloy, comprising: performing 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 on the aluminum alloy in turn, wherein the aluminum alloy comprises 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 a remaining composition being Al, a mass ratio of Zn and Mg is 5.4,
wherein the degreasing treatment is performed using trisodium phosphate, at a temperature ranging from 50° C. to 60° C. and a time ranging from 2 mins to 4 mins,
in the chemical polishing treatment, a pure phosphoric acid is used as a polishing agent, which has a specific gravity from 1.69-1.71 g/mL, and
wherein the aluminum alloy after anodizing has no material texture on a surface thereof.

2. The anodizing method of the aluminum alloy according to claim 1 , wherein the anodizing treatment is performed at a temperature ranging from 18° C. to 20° C., a voltage ranging from 8V to 10V and a time ranging from 40 mins to 50 mins, and a film thickness after the anodizing treatment ranges from 8 to 10 um.

3. The anodizing method of the aluminum alloy according to claim 2 , further comprising: a sandblasting treatment prior to the degreasing treatment.

4. The anodizing method of the aluminum alloy according to claim 1 , wherein the chemical polishing treatment is performed at a temperature ranging from 100° C. to 110° C. and a time ranging from 7 seconds to 15 seconds.

5. The anodizing method of the aluminum alloy according to claim 4 , further comprising: a sandblasting treatment prior to the degreasing treatment.

6. The anodizing method of the aluminum alloy according to claim 1 , wherein the first black-film stripping treatment is performed at a room temperature and a time ranging from 30 seconds to 90 seconds, and the second black-film stripping treatment is performed at a room temperature and a time ranging from 30 seconds to 90 seconds.

7. The anodizing method of the aluminum alloy according to claim 6 , further comprising: a sandblasting treatment prior to the degreasing treatment.

8. The anodizing method of the aluminum alloy according to claim 1 , further comprising: a sandblasting treatment prior to the degreasing treatment.

9. The anodizing method of 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.

10. The anodizing method of the aluminum alloy according to claim 9 , wherein the anodizing treatment is performed at a temperature ranging from 18° C. to 20° C., a voltage ranging from 8V to 10V and a time ranging from 40 mins to 50 mins, and a film thickness after the anodizing treatment ranges from 8 to 10 um.

11. The anodizing method of the aluminum alloy according to claim 10 , further comprising: a sandblasting treatment prior to the degreasing treatment.

12. The anodizing method of the aluminum alloy according to claim 9 , wherein the chemical polishing treatment is performed at a temperature ranging from 100° C. to 110° C. and a time ranging from 7 seconds to 15 seconds.

13. The anodizing method of the aluminum alloy according to claim 12 , further comprising: a sandblasting treatment prior to the degreasing treatment.

14. The anodizing method of the aluminum alloy according to claim 9 , wherein the first black-film stripping treatment is performed at a room temperature and a time ranging from 30 seconds to 90 seconds, and the second black-film stripping treatment is performed at a room temperature and a time ranging from 30 seconds to 90 seconds.

15. The anodizing method of the aluminum alloy according to claim 9 , further comprising: a sandblasting treatment prior to the degreasing treatment.

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd
• Guangdong Oppo Mobile Telecommunications Corp Lt

Inventors

• Zeng Yuanqing

Classifications

• B08B3/08

  the liquid having chemical or dissolving effect · CPC title

• C25D11/18

  After-treatment, e.g. pore-sealing · CPC title

• C25D11/08

  containing inorganic acids · CPC title

• C22C21/10 Primary

  with zinc as the next major constituent · CPC title

• 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