JPH0254780A - Ceramic coated steel plate - 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] The present invention provides a ceramic-coated steel sheet with excellent corrosion resistance, damage resistance, and stain resistance, which is particularly suitable for use as a building material such as exterior wall panels for buildings. Regarding.

[Prior art] Fig. 2 is a cross-sectional view showing a conventional coated steel plate, in which 1 is a steel plate substrate, 2 is an anti-corrosion metal sprayed layer formed by spraying zinc or aluminum, and 3 is an acrylic resin or epoxy coating. This is a resin sealing layer formed by spray painting a resin.

A conventional coated steel sheet is constructed as described above, in which the surface of the steel sheet 1 is coated with an anti-corrosion metal sprayed layer 2 having anti-corrosion properties, and the surface of the anti-corrosion metal spray layer 2 is resin-sealed by a resin sealing layer 3. Because it has been treated, it has excellent corrosion resistance and can withstand over 20 years under boat fishing conditions.

[Problems to be Solved by the Invention] In the conventional coated steel sheet as described above, the anti-corrosion metal sprayed layer 2 covering the surface of the steel sheet 1 is made of zinc or aluminum, which is softer than the steel sheet 1, that is, has a lower hardness. Therefore, if a coated steel plate gets scratched during construction, for example as an exterior wall panel, the scratches may reach the steel plate 1, and after construction, rust will start from that point, causing peeling and cracking. This poses a problem in that it becomes easy to clean, spoils the appearance, and shortens the product life.

The present invention has been made to solve these problems, and an object of the present invention is to obtain a ceramic-coated steel sheet having excellent corrosion resistance, damage resistance, and stain resistance.

[Means for Solving the Problems] A ceramic-coated steel plate according to the present invention includes a steel plate substrate,
An anti-corrosion layer is formed by plating or thermal spraying a metal that has a sacrificial anti-corrosion effect on steel, such as zinc or aluminum, or a mixture of these metals and ceramics on the surface of the substrate, and a thermoplastic synthetic resin is applied to the surface of the anti-corrosion layer. A resin sealing layer formed by painting or spraying a mixture of thermoplastic synthetic resin and ceramics, a ceramic spraying layer formed by spraying ceramics on the resin sealing layer, and a thermosetting synthetic resin on the surface of the ceramic spraying layer. and a resin water-repellent layer formed by coating.

[Function] The present invention has an anti-corrosion layer formed by plating or thermal spraying a metal having a sacrificial anti-corrosion effect on steel, such as zinc or aluminum, or a mixture of these metals and ceramics, on the surface of a substrate of a steel plate. Because of this, it has corrosion resistance to the substrate. A resin sealing layer is formed by painting a thermoplastic synthetic resin on the surface of the anticorrosion layer or by thermal spraying a mixture of thermoplastic resin and ceramics, and then a ceramic sprayed layer is formed by thermally spraying ceramics on the resin sealing layer. Therefore, the ceramic sprayed layer sealed with the resin sealing layer on the substrate has a damage resistance of H. Since a thermosetting synthetic resin is coated on the surface of the ceramic sprayed layer to form a resin water-repellent layer, the surface becomes water-repellent and matte, and has stain resistance, and the ceramic sprayed layer itself The color it has is reflected in its appearance.

[Example] FIG. 1 is a cross-sectional view showing an example of the present invention.
11 is an anti-corrosion layer formed on the surface of the substrate 10, and has a thickness of 30 to 50 μm.
It is formed into a thermal spray coating of 50 μm or less by zinc plating or by gas or plasma spraying using aluminum alone or a mixture of aluminum and ceramics as the thermal spraying material. Reference numeral 12 denotes a resin sealing layer formed on the surface of the anticorrosion layer II, which is coated with a thermoplastic synthetic resin such as polyethylene by spray coating, or a mixture of a thermoplastic resin and a ceramic such as alumina by gas or plasma spraying to a thickness of 50 to BOLll. ! It is configured as +. 13 has a thickness of 100 to 120 mm and is formed by plasma spraying ceramics such as alumina (Ag2O3) on the resin sealing layer 12.
- is a ceramic sprayed layer. Reference numeral 14 denotes a resin water-repellent layer having a thickness of about 51JI11 and formed by spraying a thermosetting synthetic resin such as a silane coat on the surface of the ceramic sprayed layer 13. Furthermore, immediately after spray painting is performed to form the resin water-repellent layer 14, a temperature of 1~200°C is applied.
Baking takes about 2 hours. This baking is to thermoset the thermosetting resin that is the material of the resin water repellent layer 14,
This is done to thermoplasticize the thermoplastic resin that is the material of the resin sealing layer 12 and seal the ceramic sprayed layer 13.

In the ceramic-coated steel sheet configured as described above, the anticorrosion layer 11 is formed on the surface of the substrate 10, which is a steel sheet.
The materials that make up the substrate 1° are zinc, aluminum, and a mixture of aluminum and ceramics, all of which exhibit sacrificial corrosion protection against steel. Has excellent corrosion resistance.

Further, the material constituting the ceramic sprayed layer 12 formed on the surface of the anticorrosion layer 11 via the resin sealing layer 12 is a high-hardness ceramic, and the surface of the substrate IO has the anticorrosion layer 11 and the resin sealing layer 12 interposed therebetween. When covered with the intermediate ceramic sprayed layer 12, the substrate 10 has damage resistance. Therefore, even if scratches are caused from the outside, the scratches will not reach the substrate IO.

Furthermore, since the material constituting the resin water-repellent layer I4 formed on the surface of the ceramic sprayed layer 12 is a transparent silane coat that is a thermosetting resin, and the thickness of the resin water-repellent layer 14 is as thin as about 5 mm, The surface of the ceramic-coated steel sheet is water-repellent and matte, and has a stain resistance of H, and the color of the ceramic, which is the material of the ceramic sprayed layer 13, appears on the exterior, giving it a brick-like rough appearance. Appearance.

Therefore, the ceramic-coated steel sheet of this example is suitable for use as a building material such as an exterior wall panel.

Hereinafter, a specific example of manufacturing the ceramic-coated steel sheet of the present invention will be described.

(Specific Example 1) A mild steel plate with a thickness of 1.6 mm is used as the substrate 10, and aluminum is first sprayed onto the surface of the substrate 10 to a thickness of 3 mm.
A 0- anti-corrosion layer 11 is formed. Next, polyethylene is gas-sprayed onto the anti-corrosion layer 11 formed on the substrate 10 to a thickness of 6
A resin sealing layer 12 with a thickness of 0 μm is formed. Furthermore, a ceramic sprayed layer 13 is formed on the resin sealing layer 12 by plasma spraying using alumina <Art 203) as a spraying material. The conditions for plasma spraying at this time are that the heat input is 37
KW, plasma gas is a mixed gas of argon Ar and hydrogen H2. At this time, the formed ceramic sprayed layer 1
The thickness of No. 3 is 150 μm. Furthermore, a silane coat is spray-coated on the surface of the ceramic sprayed layer (3) to form a resin water-repellent layer (4) having a thickness of 5 mm.

Finally, a substrate I on which the anticorrosion layer 11, the resin sealing layer 12, the ceramic layer 13, and the resin water-repellent layer 14 are formed in a laminated state.
When O is baked at 200℃ for 1 hour using an appropriate heating method,
Ceramic-coated steel sheets are manufactured.

(Specific Example 2) A mild steel plate with a thickness of 1.6 mm is used as the substrate 10. First, a mixture of aluminum and alumina in a ratio of 1:1 is plasma sprayed on the surface of the substrate 10 to prevent corrosion to a thickness of 50 mm. Form layer 11. Next, an anticorrosion layer 11 formed on the substrate 10
A mixture of alumina (Ag203) and polyethylene resin in a ratio of 1:1 is thermally sprayed on top to form a resin sealing layer 12 having a thickness of 50 mm. Further, a ceramic sprayed layer 13 is formed on the resin sealing layer 12 by plasma spraying using alumina (Ag203) as a spraying material. The plasma spraying conditions at this time were that the heat input was 37 KW and the plasma gas was a mixed gas of argon Ar and hydrogen H2. At this time, the thickness of the formed ceramic sprayed layer 13 is 100-.

Furthermore, a silane coat is spray-coated on the surface of the ceramic sprayed layer 13 to form a resin water-repellent layer 14 having a thickness of 51JII+.

Finally, a substrate 1 on which an anticorrosion layer 11, a resin sealing layer 12, a ceramic layer 13, and a resin water repellent layer 14 are formed in a laminated state.
0 is baked at 200° C. for 1 hour using a suitable heating means to produce a ceramic-coated steel sheet.

Next, a comparison will be made between the results of the knife wound salt spray test between the specific example of the present invention and the conventional example.

In the conventional example, the substrate 1 is a steel plate with a thickness of 1.8 mm, the anti-corrosion metal spray layer 2 is sprayed with aluminum and has a thickness of 120 um, and the resin sealing layer 3 is spray-painted with acrylic resin and has a thickness of 30 mm.
belongs to.

The salt spray test for knife damage was carried out using a commercially available cutter with a blade thickness of 1 m and a force of 5 kgν on the test surfaces of the specific example and the conventional example by 5 cm.
Moved, scratched, and then subjected to salt spray test (JIS
Z2371), and the test results are as shown in the table below.

As shown by the test results, the specific examples of the present invention are superior in corrosion resistance and damage resistance to conventional examples, and have a sufficiently long product life.

[Effects of the Invention] As explained above, the present invention includes a steel plate substrate and a metal plated or thermally sprayed on the surface of the substrate with a metal having a sacrificial anti-corrosion effect on steel, such as zinc or aluminum, or a mixture of these metals and ceramics. A corrosion protection layer formed by coating the surface of the corrosion protection layer with a thermoplastic synthetic resin or a resin sealing layer formed with a solvent mixture of thermoplastic synthetic resin and ceramics, and a resin sealing layer formed by thermally spraying ceramics on the resin sealing layer. The anti-corrosion layer has excellent corrosion resistance against the substrate because it is made of a ceramic sprayed layer formed using a ceramic sprayed layer and a resin water-repellent layer formed by coating a thermosetting synthetic resin on the surface of the ceramic sprayed layer. The ceramic sprayed layer sealed with a resin sealing layer on the substrate has damage resistance, and the resin water repellent layer improves the water repellency of the surface and makes it matte. It is stain resistant and has a rough brick-like appearance that reflects the color of the ceramic sprayed layer itself, so it has a long product life when used as a building material such as exterior wall panels. It has the effect of being

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional coated steel plate. DESCRIPTION OF SYMBOLS 10...Substrate, 11...Anti-corrosion layer, 12...Resin sealing layer, 13...Ceramics layer, 14...Resin water-repellent layer.

Claims (1)

[Claims] A steel plate substrate, an anti-corrosion layer formed by plating or spraying a metal such as zinc or aluminum that has a sacrificial anti-corrosion effect on steel, or a mixture of these metals and ceramics, on the surface of the anti-corrosion layer. A resin sealing layer formed by painting a thermoplastic synthetic resin or spraying a mixture of a thermoplastic synthetic resin and ceramics;
A ceramic-coated steel sheet comprising a ceramic sprayed layer formed by spraying ceramics on a resin sealing layer, and a resin water-repellent layer formed by coating a thermosetting synthetic resin on the surface of the ceramic sprayed layer. .