JPS63176146A - Coating structure of metallic member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a coating film structure for a metal member, and in particular, a coating film formed on the surface of a metal member having a processed (cutting) surface and an unprocessed surface. It's about structure.

[Conventional wave i$te]

Recently, a part of the surface of a metal member is cut to form a shiny surface, and in addition to making use of the shine of this processed surface, the unprocessed surface is colored, etc., thereby creating a contrast between the two (processed surface and non-processed surface). There is a method that uses I. to make the processed surface stand out.

In this case, the processed surface is coated with a clear coating to ensure its shine.

[Problems with conventional technology]

However, since this clear coating film was an organic coating film, (1) the adhesion between the coating film and the processed surface was poor, resulting in the processed surface being susceptible to rust. In addition, (2) it has good adhesion to dirt, and because it is soft and easily scratches, it is difficult to remove dirt adhering to the paint film on the processed surface, resulting in the inconvenience that the beauty of the paint film is impaired. I had it.

On the other hand, it is also possible to apply an inorganic coating film to the surface of the processed surface, but as mentioned in (1) above, if the thickness of the inorganic coating film is increased, it will separate from the processed surface of the metal member. (2) Inorganic paint films have the disadvantage that the firing temperature of the paint is high, so the metal parts are likely to change in quality during firing.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned disadvantages, and the gist thereof is to provide a metal member having a processed surface and an unprocessed surface, and to provide an organic material on the unprocessed surface. In the coating film structure of a metal member in which an inorganic coating film is applied to the processed surface, the chemical structure of the chemical substance constituting the inorganic coating film is an alkyl group or an aryl group. This is a coating film structure of a metal member characterized by containing an allyl group.

[Action of the invention]

The coating structure of a metal member according to the present invention includes a metal member having a processed surface and an unprocessed surface, and an organic coating film is applied to the unprocessed surface, and an inorganic coating film is applied to the processed surface. In the coating film structure of the metal member, the chemical structure of the chemical substance constituting the inorganic coating film contains an alkyl group or an aryl group. The coating film can exhibit the properties of an organic coating while maintaining the properties of an inorganic coating.

[Explanation of Examples]

A vehicle wheel will be described below as an example of the present invention.

In FIG. 1, 11 is a disc of a vehicle wheel H;
13 is this disk (corresponding to the metal member of this invention)
This is a rim integrally formed on the outer peripheral edge of 11. Reference numeral 15 denotes a concave portion, which is formed at the periphery of the disk 11. This recess 15 enhances the decorativeness of the wheel H. In order to manufacture such a vehicle wheel H, the disc 11 and the rim 13 may be integrally cast from an aluminum alloy.

In FIG. 2, reference numeral 21 denotes an organic coating film, which is applied to the inner wall surface 15a of the recess 15 of the disk 11 (corresponding to the unprocessed surface of the present invention). This organic coating film 21 is a colored coating film, and may be any organic coating film. or,
23 is an inorganic coating film applied to the disk surface (corresponding to the unprocessed surface of the present invention) 11a. This inorganic coating film 23 is formed by applying a paint containing polydimethylsiloxane as a main component represented by the following chemical formula to the disk surface and baking it. The methyl group in this chemical formula corresponds to the alkyl group of this invention. Note that examples of the solvent for the paint include mixtures of water, methanol, isopropyl alcohol, ethylene glycol monobutyl ether, and the like.

CH3CH3CH3 Next, a method for forming the organic coating film 21 and the inorganic coating film 23 will be explained.

After casting the vehicle wheel H, the entire disc 11 (recess 1
An organic colored paint 21 is applied to the inner wall surface 15a (including the inner wall surface 15a of No. 5). Then, the disk 11 is cut into a flat shape to form a bright disk surface 11a, and this disk surface 11
The inorganic paint 23 may be applied to a.

〔Effect of the invention〕

The coating structure of a metal member according to the present invention includes a metal member having a processed surface and an unprocessed surface, and an organic coating film is applied to the unprocessed surface, and an inorganic coating film is applied to the processed surface. In the coating film structure of the metal member, the chemical structure of the chemical substance constituting the inorganic coating film contains an alkyl group or an aryl group. The coating film can exhibit the properties of an organic coating while maintaining the properties of an inorganic coating.

Therefore, the coating film structure of this metal member is as follows: (1) The coating film and the processed surface of the metal member have good adhesion, so the processed surface of the metal member is unlikely to rust, and (2) the coating film on the processed surface Since dirt is difficult to adhere to the surface, the beautiful appearance of the processed surface can be maintained. Also, since it is hard, it is hard to get scratched.

(3) The thickness of the coating film on the processed surface can be increased.

(4) Since the paint can be fired at a low temperature, metal members are less likely to change in quality during firing.

Particularly when the metal member is a light metal, it is possible to prevent thread rust from occurring on the machined surface.

[Brief explanation of the drawing]

The drawings show an embodiment of the coating structure of a metal member according to the present invention, and FIG. 1 is a cross-sectional view of a vehicle wheel, and FIG. 2 is an enlarged view of the part (■) in FIG. 1. 11... Metal member (disc) 11a...
Processed surface (disk surface) 15a... Unprocessed surface (
Inner wall surface of recess) 21 ... Organic coating film 23 ... Inorganic coating film Fig. 1■1 2nd @

Claims (4)

[Claims] (1) In a coating film structure of a metal member comprising a metal member having a processed surface and an unprocessed surface, an organic coating film is applied to the non-processed surface and an inorganic coating film is applied to the processed surface. . A coating film structure for a metal member, wherein the chemical structural formula of the chemical substance constituting the inorganic coating film includes an alkyl group or an aryl group. (2) A coating film structure for a metal member according to claim 1, wherein the inorganic coating film is transparent and the organic coating film is a colored coating film. (3) A coating film structure for a metal member according to claim 1 or 2, wherein the inorganic coating film is composed of a chemical substance whose main component is polydimethylsiloxane. (4) A coating film structure for a metal member according to claim 1, 2 or 3, wherein the metal member is made of a light alloy.