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

Abstract

[Problem] The purpose of the present invention is to provide a surface treatment method for a metal member which, while maintaining the metal texture of the surface of a metal member, improves surface characteristics of the metal member. Also provided is a metal member thus obtained. [Solution] The surface of an anodic oxide coating formed on a metal surface prior to sealing is brought into contact with a fluorine-based polymer solution, after which steam sealing is performed. Thus, the metal member obtained is characterized by having a fluorine-based polymer layer with a thickness of 100 nm or less, and a composite sealing treatment layer formed contiguously under the fluorine-based polymer layer and in which fluorine-based polymer has been filled into the pores of the anodic oxide coating.

Description

technical field [0001] The invention relates to a method for the surface treatment of anodizable metal parts and a metal part obtained by the method with improved surface properties. Background technique [0002] Metal parts made of aluminum and its alloys, magnesium and its alloys, titanium and its alloys, etc., have been widely practiced by anodizing the surface to improve corrosion resistance, designability, etc. [0003] However, the anodized film alone may not have sufficient corrosion resistance for long-term use. [0004] Furthermore, there is also a problem of easy attachment of contamination. [0005] Furthermore, when there is a coloring process such as secondary electrolytic coloring after the anodizing treatment, there is also a problem of large discoloration because the corrosion resistance of the anodized film is insufficient. [0006] As a countermeasure, in the field of aluminum building materials and the like, transparent coating by anion electrodeposition...

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Problems solved by technology

[0011] However, according to this publication, it is stated that the thickness of the PTFE coating layer is 3 μm is suitable, so the film-like texture appears on the surface, and since it is described that primer coating or pore expansion treatment of the anodized film is necessary Therefore, it is the main reason for the complicated process and high processing costs

[0012] Patent Document 2 discloses a process of immersing an amorphous fluororesin in a solution containing a hydrophilic amorphous fluororesin for the purpose of allowing the amorphous fluororesin to enter the pores of the anodized film. Therefore, preheat treatment must be performed, and the fluororesin layer must be polymerized and laminated by heating at 200°C for 30 minutes

[0013] Therefore, the coating layer disclosed in this gazette is also thick and has a film-like texture, and if it is heated at a high temperature of 200°C, there is also a problem that cracks occur in the anodized film.

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