Anodized member and method for sealing anodic oxide coating

Abstract

An anodized member includes a metal, and an anodic oxide coating that is formed on the surface of the metal. The surface of the anodic oxide coating includes a high-concentration layer that has a sealing metal content of 1.5 mmol/g or more. The high-concentration layer has a thickness of 0.15 μm or more.

What is claimed is: 
     
         1 . A method for producing an anodized member comprising forming a porous anodic oxide coating on a surface of a metal, immersing the porous anodic oxide coating in a sealing solution that has a concentration of a sealing metal ion of 30 to 60 mmol/l and a fluorine ion concentration of 70 to 120 mmol/l, and subjecting the porous anodic oxide coating to a steam sealing treatment, the sealing metal ion being an Ni ion,
 a high-concentration layer of a sealing metal that is formed in the porous anodic oxide coating by immersing the porous anodic oxide coating in the sealing solution, and subjecting the porous anodic oxide coating to the steam sealing treatment, having a sealing metal content of 1.8 to 2.7 mmol/g,   the high-concentration layer having a depth of 0.24 pm or more, and   a surface of the porous anodic oxide coating not whitening when immersed in purified water at 40° C. for 240 hours.   
     
     
         2 . The method for producing an anodized member as defined in  claim 1 ,
 the sealing solution having a temperature of 20 to 30° C., and   the steam sealing treatment being performed at a temperature of 140° C. or more.