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 . An anodized member comprising:
 a metal; and   an anodic oxide coating that is formed on a surface of the metal,   a surface of the anodic oxide coating including a high-concentration layer that has a sealing metal content of 1.5 mmol/g or more, and the high-concentration layer having a thickness of 0.15 μm or more.   
     
     
         2 . The anodized member as defined in  claim 1 ,
 the sealing metal being Ni, Co, or Cu.   
     
     
         3 . The anodized member as defined in  claim 1 ,
 the high-concentration layer having a sealing metal content of 1.8 mmol/g or more and a thickness of 0.24 μm or more.   
     
     
         4 . The anodized member as defined in  claim 1 , the surface of the anodic oxide coating not whitening when immersed in purified water at 40° C. for 240 hours. 
     
     
         5 . A method for sealing an anodic oxide coating comprising:
 immersing a porous anodic oxide coating formed on a surface of a metal in a sealing solution that has a sealing metal ion concentration 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.   
     
     
         6 . The method as defined in  claim 5 , further comprising:
 decreasing or increasing pressure in a state in which the porous anodic oxide coating is immersed in the sealing solution.   
     
     
         7 . The method as defined in  claim 5 ,
 the sealing metal ion being an Ni ion, a Co ion, or a Cu ion.   
     
     
         8 . The method as defined in  claim 5 ,
 the sealing solution having a sealing metal ion concentration of 34 to 55 mmol/l and a fluorine ion concentration of 70 to 110 mmol/l.