JPS6123112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a corrosion-resistant metal body.

Conventionally, a corrosion-preventing means called metallicon, for example, has been used to prevent rusting and corrosion on the surface of ferrous metals. Metallicon is made by thermally spraying other rust-resistant metals into particles to form a porous metal that adheres to the surface, similar to a chestnut paste.
Therefore, the metallicon surface contained pinholes, and the corrosion protection effect was not sufficient. In addition, in order to close these pinholes, a resin solution is introduced into the pinholes, but due to shrinkage due to evaporation of the solvent, it is not possible to prevent the formation of pinholes. However, it takes time for the solvent to evaporate, and when heated, pinholes are generated due to the solvent, so the corrosion prevention effect is still not sufficient. Furthermore, it has been difficult to close pinholes with powder coating because foaming occurs due to high temperature baking.

In view of the current situation, the inventor has conducted extensive research and found that
A method for manufacturing a corrosion-resistant metal body that eliminates the above-mentioned drawbacks has been completed.

The present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged sectional view showing one embodiment of a corrosion-resistant body manufactured according to the present invention, in which 1 is a metal base material, 2 is a metal layer, and 3 is a coating resin layer.

In the present invention, first, irregularities are formed on the surface of the metal base material 1, and the method of roughening the surface is by spraying an abrasive material onto the surface of the base material 1 using compressed air or the like. As an abrasive material,
Natural products such as diamond, emery, spinel, garnet, etc. or man-made products such as alumina, silicon carbide, boron carbide, cast iron particles can be used. Among these, it is preferred to use cast iron particles or grids. The unevenness formed by these abrasive materials has a maximum height of 30 to 70 microns between the peak and valley of the protrusion in the cross section, i.e.
Preferably Rmax is 30-70 microns.

Further, as the metal base material 1, cast iron, pig iron, various iron alloys, metals mainly composed of iron, etc. can be used. The shape of the base material 1 is not particularly limited, such as a plate shape or a cylindrical shape.

Next, zinc, aluminum,
A metal layer is formed by spraying a metal consisting of copper, brass, or an appropriate alloy thereof in the form of particles. Zinc, aluminum, or an alloy thereof is preferably used as the metal to be thermally sprayed, and in the case of an alloy, the zinc preferably contains 85% by weight of zinc and 15% by weight of aluminum. Further, the surface of the metal layer 2 has many irregularities, and the degree of the irregularities is not particularly limited, but is usually about Rmax 50 microns.
Further, the thickness of the metal layer 2 is usually about 75 to 500 microns.

Next, a self-lubricating powder or solid resin is applied to the surface of the metal layer 2. As the self-lubricating resin, fluororesin, nylon, polyethylene, polypropylene, etc. are preferably used, but other resins may be used as long as they do not decompose due to frictional heat. Further, when applying powder resin to the surface of the metal layer 2, it is applied uniformly by electrostatic powder coating or the like.
When applying a solid resin, it is applied by pressing a material made of fluorine resin, nylon, polyethylene, etc. onto the uneven surface of the metal 2 and scraping it.

Next, the resin applied to the surface of the metal layer 2 is pressed to make the resin bite into the metal layer 2, thereby forming a covering resin layer 3 in which the resin is pressed and integrated. The pressing method involves inserting a roll pressing board, a diamond or a slit, and squeezing the resin while pressing it.
Further, the heat generated during this pressing facilitates the adhesion between the resins and the formation of the coating resin layer 3. Furthermore, the coating resin layer 3 may be formed by heating the resin to soften or melt it during pressing.

The coating resin layer 3 may be formed to a desired thickness by repeatedly applying a self-lubricating resin and pressing as necessary.

Next, examples of the present invention will be described.

〔Example〕

The surface of a steel rod with an outer diameter of 10 mm was ground by grid blasting to create an uneven surface with an average roughness of 30 microns. Next, a zinc wire (purity 99.99
%) using a gas-sprayed metallicon,
A 100 micron thick zinc layer was formed. continue,
Fluorine resin powder was sprayed onto the surface of the zinc layer using electrostatic powder coating gas to form a resin coating film with a thickness of 50 microns. Next, the coating film was preliminarily compressed using a concave roll, and an iron rod was inserted into the die to press and squeeze the coating film to give a coating thickness of 20 microns.

The iron rod thus obtained was subjected to a salt spray test.
After 500 hours, no rust occurred and no abnormality was observed.

As detailed above, the present invention applies powder or solid resin to the uneven surface of the metal layer, and presses the resin from above to make the resin bite into the metal to form a coating resin layer. , it is possible to obtain a corrosion-resistant body that can be processed at low temperatures without requiring volatile substances such as solvents, and has an excellent corrosion-proofing effect that suppresses the occurrence of bottle holes.

In addition, since low-temperature processing is possible without the need for volatile substances, there is no fire or hygiene problem, and it can meet the demand for energy conservation.

Further, since the coating resin layer is formed by pressing a self-lubricating resin, the pressing process can be easily performed and the surface of the coating resin layer can be made smooth and beautiful.

Furthermore, since a metal layer is formed on the roughened surface of the metal base material and a resin is bitten into the uneven surface of the metal to form a coating resin layer, the metal base material
It is possible to obtain a corrosion-resistant body with an excellent corrosion-proofing effect in which the metal layer and the coating resin layer are firmly adhered to each other.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view showing one embodiment of a corrosion-resistant body manufactured according to the present invention. 1... Metal base material, 2... Metal layer, 3... Coating resin layer.

Claims (1)

[Claims] 1 The surface of a metal base material is roughened by forming irregularities, and then a metal made of zinc, aluminum, copper, brass, or an appropriate alloy thereof is sprayed in the form of particles to form a metal. A coating resin layer is formed by applying self-lubricating powder or solid resin to the uneven surface of the metal layer, and pressing the resin onto the surface to make the resin bite into the metal layer. A method for manufacturing a corrosion-resistant metal body.