Exterior Member And Method For Producing The Same

Abstract

An exterior member includes a metal material made of aluminum or an aluminum alloy, an anodized layer formed on a surface of the metal material and including micropores; and a composite film layer of metal hydroxide and metal oxide, provided on the anodized layer at a surface side of the micropores to seal the micropores.

What is claimed is: 
     
         1 . An exterior member comprising;
 a metal material made of aluminum or an aluminum alloy;   an anodized layer formed on a surface of the metal material and including micropores; and   a composite film layer of metal hydroxide and metal oxide, provided on the anodized layer at a surface side of the micropores to seal the micropores.   
     
     
         2 . The exterior member as defined in  claim 1 , wherein the composite film layer includes nickel hydroxide and zirconium oxide or zirconium hydroxide. 
     
     
         3 . The exterior member as defined in  claim 2 , wherein the composite film layer further includes silicate. 
     
     
         4 . The exterior member as defined in  claim 3 , wherein the composite film layer further includes an acrylic organic substance. 
     
     
         5 . The exterior member as defined in  claim 1 , wherein the composite film layer has a thickness of 200 nm or more. 
     
     
         6 . A method for producing an exterior member comprising:
 forming an anodized layer on a metal material made of aluminum or an aluminum alloy, the anodized layer including micropores;   immersing the metal material having the anodized layer in an aqueous solution containing nickel fluoride and zircon hydrofluoric acid; and   thereafter, immersing the metal material in an aqueous solution containing silicates.   
     
     
         7 . The method as defined in  claim 6 , wherein the aqueous solution containing the silicates includes acrylic organic matter.