Surface treatment method for metal member and metal member obtained by the same

Abstract

A surface treatment method improves the surface properties of a metal member while maintaining the metal surface texture, and a metal member is obtained by the surface treatment method. The surface-treated metal member is obtained by bringing a solution of a fluorine-based polymer into contact with a surface of an anodic oxidation coating that is formed on a surface of a metal and has not been subjected to a sealing treatment, and subjecting the anodic oxidation coating to a steam sealing treatment, the surface-treated metal member comprising a fluorine-based polymer layer having a thickness of 100 nm or less, and a composite sealed layer that is formed continuously under the fluorine-based polymer layer, the composite sealed layer having a configuration in which the fluorine-based polymer is present inside pores formed in the anodic oxidation coating.

1 . A surface-treated metal member that is obtained by bringing a solution of a fluorine-based polymer into contact with a surface of an anodic oxidation coating that is formed on a surface of a metal and has not been subjected to a sealing treatment, and subjecting the anodic oxidation coating to a steam sealing treatment,
 the surface-treated metal member comprising:   a fluorine-based polymer layer having a thickness of 100 nm or less; and   a composite sealed layer that is formed continuously under the fluorine-based polymer layer,   wherein the composite sealed layer has a configuration in which the fluorine-based polymer is present inside pores formed in the anodic oxidation coating.   
     
     
         2 . The surface-treated metal member as defined in  claim 1 , wherein
 the anodic oxidation coating that has not been subjected to a sealing treatment has been subjected to electrolytic coloring.   
     
     
         3 . A surface treatment method for a metal member comprising:
 forming a porous anodic oxidation coating on a surface of a metal;   bringing a fluorine-based polymer solution into contact with the anodic oxidation coating in a state in which the anodic oxidation coating is unsealed or semi-sealed; and   subjecting the anodic oxidation coating to a steam sealing treatment.   
     
     
         4 . The surface treatment method as defined in  claim 3 , further comprising:
 subjecting the anodic oxidation coating to electrolytic coloring after forming the porous anodic oxidation coating, but before bringing the fluorine-based polymer solution into contact with the anodic oxidation coating.