Title:
MAGNESIUM CONTAINING ALUMINUM ALLOYS AND ANODIZING PROCESS
Document Type and Number:
WIPO Patent Application WO2004063405
Kind Code:
A3
Abstract:
An anodized aluminum alloy comprises an aluminum alloy comprising magnesium in an amount greater than 3 weight percent based on the total weight of the aluminum alloy; and a clear porous oxide layer having a thickness greater than about 5 micrometers disposed on and into a surface of the aluminum alloy, wherein the anodized aluminum alloy has a surface gloss value greater than about 40 gloss units as measured on a gloss meter at dual illumination angles of 60<°> and 85<°>. An anodizing process comprises immersing an aluminum alloy workpiece comprising greater than 3 weight percent magnesium based on a total weight of the aluminum alloy into an anodizing solution comprising about 10 to about 25 weight percent sulfuric acid maintained at a temperature of about 18<°>C to about 22<°>C; applying a first direct electric current density less than or equal to about 5 amperes per square foot for a period of time sufficient to produce an oxide layer at a thickness of at least about 5 micrometers on and into a surface of the aluminum alloy workpiece; and applying a subsequent direct electric current density greater than or equal to about 10 amperes per square foot for a period of time sufficient to produce a final oxide thickness of about 10 micrometers to about 25 micrometers, wherein the oxide layer is clear and the aluminum alloy workpiece has a gloss value greater than 40 gloss units as measured by a gloss meter at dual illumination angles of 60<°> and 85<°>.
Inventors:
KUO HONG-HSIANG
WANG YAR-MING
KIA SHEILA FARROKHALAEE
WANG YAR-MING
KIA SHEILA FARROKHALAEE
Application Number:
PCT/US2003/038847
Publication Date:
November 18, 2004
Filing Date:
December 08, 2003
Export Citation:
Assignee:
GEN MOTORS CORP (US)
International Classes:
B32B3/26; B32B15/00; B32B15/20; C25D5/34; C25D11/02; C25D11/04; C25D11/08; C25D11/12; C25D11/22; C22C; (IPC1-7): B32B15/00; B32B3/26; C25D11/02; C25D11/08
Foreign References:
| US6309427B1 | 2001-10-30 | |||
| US5948542A | 1999-09-07 | |||
| US6322689B1 | 2001-11-27 | |||
| US4022671A | 1977-05-10 |
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