Surface-treated aluminum material and zinc-supplemented aluminum alloy

Abstract

Provided are a surface-treated aluminum material having, on an aluminum material formed of aluminum or an aluminum alloy, a porous anodically oxidized film of a uniformly porous type exhibiting no visually recognizable crystal grain pattern after anodic oxidation treatment, and a novel zinc-doped aluminum alloy suitable for manufacture of the surface-treated aluminum material. The surface-treated aluminum material includes an aluminum alloy base material and an anodically oxidized film formed on a surface thereof, in which the aluminum alloy base material is formed of a zinc-doped aluminum alloy having an alloy composition containing 0.05 mass % to 1 mass % of a Zn component, 0.02 mass % or less of inevitable impurities, and the balance of aluminum.

1 . A surface-treated aluminum material, comprising:
 an aluminum alloy base material; and   an anodically oxidized film formed on a surface of the aluminum alloy base material,   wherein the aluminum alloy base material is formed of a zinc-doped aluminum alloy having an alloy composition containing 0.05 mass % to 1 mass % of a Zn component, 0.02 mass % or less of inevitable impurities, and the balance of aluminum.   
     
     
         2 . A surface-treated aluminum material according to  claim 1 , wherein the anodically oxidized film is formed through anodic oxidation treatment using a polybasic acid aqueous solution as a treatment bath. 
     
     
         3 . A surface-treated aluminum material according to  claim 1  or  2 , wherein the aluminum alloy base material is subjected to planarization treatment by any one method selected from cutting work, buff polishing, electropolishing, and chemical polishing, prior to the anodic oxidation treatment. 
     
     
         4 . A zinc-doped aluminum alloy, which is obtained by doping high-purity aluminum with Zn, the zinc-doped aluminum alloy comprising 0.05 mass % to 1 mass % of a Zn component, 0.02 mass % or less of inevitable impurities, and the balance of aluminum.