Surface treatment method of aluminum for bonding different materials

Patent metadata

Field	Value
Publication number	US-2019127857-A1
Application number	US-201816156699-A
Country	US
Kind code	A1
Filing date	Oct 10, 2018
Priority date	Oct 27, 2017
Publication date	May 2, 2019
Grant date	—

Abstract

Disclosed is a method of fabricating an aluminum alloy member for bonding different materials. The method may include etching the aluminum alloy member with one or more etching solutions, and forming one or more undercuts on a surface of the aluminum alloy member.

First claim

What is claimed is:

1 . A method of fabricating an aluminum alloy member, comprising:
etching a surface of the aluminum alloy member using one or more etching solutions; and forming one or more undercuts on the surface of the aluminum alloy member.

2 . The method of claim 1 , wherein the etching the surface of the aluminum alloy member is repeated one or more times.

3 . The method of claim 1 , wherein the one or more undercuts are formed by:
a first etching of immersing the aluminum alloy member in an CrO 3 aqueous solution; a second etching of immersing the aluminum alloy member in an FeCl 3 aqueous solution; and a third etching of immersing the aluminum alloy member in an HCl aqueous solution.

4 . The method of claim 3 , wherein the first etching comprises immersing the aluminum alloy member in the CrO 3 aqueous solution of at a temperature of about 20 to 30° C.

5 . The method of claim 4 , wherein the first etching comprises immersing the aluminum alloy member in the CrO 3 aqueous solution for about 3 minutes.

6 . The method of claim 4 , wherein the CrO 3 aqueous solution has a concentration of CrO 3 of about 150 g/l to 200 g/l.

7 . The method of claim 3 , wherein the second etching comprises immersing the aluminum alloy member in the FeCl 3 aqueous solution of a temperature of about 20 to 30° C.

8 . The method of claim 7 , wherein the second etching comprises immersing the aluminum alloy member in the FeCl 3 aqueous solution for about 0.5 to 1 minutes.

9 . The method of claim 7 , wherein the FeCl 3 aqueous solution has a concentration of FeCl 3 of about 50 g/l -150 g/l.

10 . The method of claim 3 , wherein the third etching comprises immersing the aluminum alloy member in the HCl aqueous solution of a temperature of about 20 to 30° C.

11 . The method of claim 10 , wherein the third etching comprises immersing the aluminum alloy member in the HCl aqueous solution for about 0.5-1 minutes

12 . The method of claim 10 , wherein the HCl aqueous solution has a concentration of HCl of about 50 g/l to 150 g/l.

13 . The method of claim 1 , further comprising coating TiO 2 powder on the one or more undercuts.

14 . The method of claim 13 , wherein the coating the TiO 2 powder comprises immersing the aluminum alloy member in an TiO 2 aqueous solution comprising the TiO 2 powder.

15 . The method of claim 14 , wherein the TiO 2 aqueous solution has a concentration of the TiO 2 powder of about 20 mg/l.

16 . The method of claim 15 , wherein the coating the TiO 2 powder comprises immersing the aluminum alloy member in the TiO 2 aqueous solution at a temperature of about 20 to 30° C.

17 . The method of claim 16 , wherein the coating the TiO 2 powder comprises immersing the aluminum alloy member in the TiO 2 aqueous solution for about 0.5 to 1 minutes.

18 . An aluminum alloy member manufactured by a method of claim 1 .

19 . A vehicle part comprising an aluminum alloy member of claim 18 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Yoo Chang-Yeol
• Kong Byung-Seok

Classifications

• B05D2202/25

  based on Al · CPC title

• C23G1/00

  Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G5/02) · CPC title

• C25F1/00

  Electrolytic cleaning, degreasing, pickling or descaling · CPC title

• C23F1/20 Primary

  for etching aluminium or alloys thereof · CPC title

• B05D2350/63

  ceramic layer · CPC title