JPH0244588B2 - KOSEIHINNOHYOMENSOSHOKUHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a surface decoration method for various steel products such as gate posts, gates, street lights, signposts, and the like. (Prior art) When decorating the surface of a conventional steel product by forming an uneven pattern, rust forms on the surface and rust is brittle, so the uneven pattern is difficult to form. In order to prevent the uneven pattern from disappearing along with the process, it is common to protect the surface by forming a protective coating such as anti-corrosion paint on the surface of the steel product after the uneven pattern has been formed.

(Problems to be Solved by the Invention) In the case of the conventional surface decoration method for steel products, small pores, cracks or peeling occur in the protective coating such as anti-corrosion paint due to long-term use of the steel product. This has the disadvantage that rust occurs from the deteriorated portions of the protective coating, spoiling the surface decoration.

(Means for solving the problem) The present invention does not prevent the occurrence of rust on steel products as in the past, but on the contrary, utilizes stable rust that forms on the surface of steel to ensure long-term use. The purpose is to provide a surface decoration method for steel products that does not damage the surface decoration even when exposed to weathering. It consists of forming a desired uneven pattern and then forming a porous resin coating on the surface.

Stable rust here refers to dense rust that is formed on the surface of weathering steel materials through repeated development, detachment or outflow of rust layers or outflow of iron ions due to exposure to the atmosphere, and includes Fe ⁺⁺⁺ and Fe ⁺ Weathering steel that has a composition that is mainly composed of ⁺ oxides and also contains small amounts of alloy components such as Cu, Cr, and Ni that are produced by corrosion (dissolution) of weathering steel, and that produces stable rust on the surface. For example, highly weather resistant rolled steel
SPA-H, SPA-C (JIS revised on January 1, 1978)
G 3125) and weather-resistant hot-rolled steel for welded structures
SMA 41 AW SMA 41 BW, SMA 41 CW,
SMA 50 AW SMA 50 BW, SMA 50 CW,
SMA 58W (JIS G 3114 revised on March 1, 1988)
etc. are used.

To form an uneven pattern on the surface of a steel product formed into a desired shape using such steel material, it may be performed by mechanical cutting with a cutting tool, optical cutting with a laser beam, casting, etc.; It is preferable because the etching is complicated and a precise uneven pattern can be easily formed.

Formation of a porous resin film that covers the surface of a steel product with an uneven pattern can be achieved by, for example, applying a porous low-molecular acrylic resin film directly to the surface of the steel product, or applying a phosphate-based chemical conversion film to the surface of the steel product. This is done by a so-called rust stabilization treatment that is formed through the process.

By forming such a porous resin film, it is possible to protect the uneven pattern on the surface of the steel product until stable rust forms, and also to use the air permeability and water permeability of the film to create a uniform and appropriate surface under the film. At the same time, this brittle rust can be retained under the coating, leading to the formation of stable rust. Therefore, with long-term use of steel products, a dense and hard amorphous rust layer is formed on the surface of the steel product, making the uneven pattern formed on the surface of the steel product durable.

(Example) Examples of the present invention will be described below with reference to the accompanying drawings.

The figure shows an example in which the surface decoration method for steel products of the present invention is applied to the surface decoration of street light poles. This figure shows a cylindrical support main body made by Co., Ltd., consisting of an upper small-diameter part 1a and a large-diameter part 1c continuous below it via a curved part 1b.
In addition, 1d in the figure shows the drilling hole for the cable.

First, the outer circumferential surface of the column main body 1 is subjected to pretreatment such as shot blasting, degreasing, and pickling to remove mill scale, red rust, oil, etc., and the outer circumferential surface is activated as shown in the first figure. Prepare the pillar body 1.

Next, as shown in FIG. 2 and FIG. Paste it on the surface. In the illustrated example, two rectangular transfer papers 4, 4 are wrapped around the small diameter portion 1a of the support main body 1,
A sheet of substantially rectangular transfer paper 4, in which a cut 5 was made in the unfolded state at a portion corresponding to the curved portion 1b, was wrapped around the curved portion 1b and the large diameter portion 1c.

In addition, when wrapping the transfer paper 4 around the support main body 1 as described above in order to form a wood grain uneven pattern over the entire outer peripheral surface of the support main body 1 as shown in the figure,
If a gap occurs between the abutting edges of the transfer paper 4 or if the abutting edges overlap, a seam will occur in the pattern. If a small gap is formed between the abutting edges to leave a slight gap, and the elasticity of the transfer paper 4 is used after wrapping to join the abutting edges against each other, the struts can be joined. A seamless wood grain pattern can be transferred to the outer peripheral surface of the main body 1.

Next, the transfer paper 4 attached to the support main body 1...
60 by a heating device such as a heater (not shown)
The wood grain pattern of the resist ink 3 is transferred to the outer peripheral surface of the support body 1 by heating to ~70°C, and then the transfer paper 4 is removed and the resist ink 3 is applied to the outer peripheral surface as shown in FIGS. 4 and 5. A support main body 1 formed with a wood grain pattern is obtained.

Next, the pillar body 1 is masked at both ends and the cable hole 1d with a masking material 6 such as masking tape, and then immersed in an etching solution such as ferric chloride solution and covered with resist ink 3. The unetched outer peripheral surface of the support main body 1 is etched, and then the resist ink 3 is removed by alkaline cleaning to obtain the support main body 1 having an uneven pattern of wood grain formed on the outer peripheral surface as shown in FIGS. 6 and 7. .

Next, the outer circumferential surface of the strut body 1 on which the uneven pattern has been formed is reacted with Weathercoat #1000 solution (trade name manufactured by Nippon Parkerizing Co., Ltd.) to form a phosphate-based chemical conversion coating on the outer circumferential surface. , furthermore, prepalene (trade name manufactured by Nippon Parkerizing Co., Ltd.) is applied on the film.
is sprayed to form a porous, breathable, and water-permeable low-molecular-weight acrylic resin film.

Finally, the masking material 6 such as masking tape that masked both ends of the column main body 1 and the cable drilling hole 1d is removed, and the outer peripheral surface of the column main body 1 is patterned with uneven wood grains that will not disappear even after years of use. Obtain a street light post formed of.

In the above example, Weathercoat #1000 was used in combination with Preparen, but instead of using Weathercoat #1000, Preparen was directly sprayed onto the outer peripheral surface of the pillar body 1 to create a porous, breathable, and water-permeable low-molecular acrylic material. It is also possible to simply form a film of resin liquid.

(Effects of the Invention) As described above, according to the surface decoration method for steel products of the present invention, a desired uneven pattern can be formed on the surface of a steel product made of a weather-resistant steel material that generates stable rust on the surface and formed into a desired shape. Since a porous resin coating is then formed on the surface, it is possible to apply a surface decoration to the steel product that will not cause any damage even after long-term use.

[Brief explanation of the drawing]

The drawings show an example of the application of the steel product surface decoration method of the present invention to the surface decoration of street light poles. The front view of the inner support column, Figure 3 is the − of Figure 2.
FIG. 5 is an enlarged sectional view of the main part taken along the line - in FIG. 4, and FIG. 7 is an enlarged sectional view of the main part taken along the line - in FIG. 6. 1... Support main body, 1a... Small diameter part, 1b... Curved part,
1c...Large diameter portion, 2...Silicone cloth, 3...Resist ink, 4...Transfer paper.

Claims (1)

[Claims] 1. The surface of a steel product, which consists of forming a desired uneven pattern on the surface of a steel product made of a weather-resistant steel material that generates stable rust on the surface, and then forming a porous resin coating on the surface. Decoration method.