KR19980043973A - Steel color steel sheet and manufacturing method of soundproof wall outer plate using same - Google Patents

Abstract

The present invention relates to a steel color coated steel sheet and a method for manufacturing a soundproof wall outer plate using the same, the purpose of which is to obtain a steel color coated steel sheet excellent in coating adhesion, workability and corrosion resistance using a hot-dip galvanized steel sheet, In addition, by using the coated steel sheet to obtain a soundproof wall outer plate steel plate excellent in cross-sectional corrosion resistance.

The present invention for achieving the above object is a steel color steel sheet made of hot-dip galvanized steel sheet, the surface of the hot-dip galvanized steel sheet, the coating amount of 20 ~ 100mg / ㎡ chromate coating, epoxy resin or polyester resin The present invention relates to a steel color coated steel sheet in which a lower coating layer made of a coating layer and an upper coating layer made of a polyester resin system are sequentially formed, and also to a method of manufacturing a soundproof wall outer plate using the coating steel sheet.

Description

Steel color steel sheet and manufacturing method of soundproof wall outer plate using same

The present invention relates to a steel sheet used for soundproof walls installed for noise reduction of roads and railroads, and more specifically, a material coated with color in various colors on a galvanized steel sheet, and a soundproof wall having excellent surface appearance and multi-face corrosion resistance using the same. It relates to a method for producing a molten steel sheet.

Nowadays, interest in clean environment is growing day by day, due to various pollution, the sufferings of people are increasing and it is hard to endure. Thus, not only the desire for clean air and water, but also the desire for liberation from the noise of living is negligible. The soundproof wall is installed to block such various noises. A typical soundproof wall structure consists of an inner steel plate facing the road, an outer steel sheet on the residential side, and a sound absorbing material in the middle (Insulation Products, 1991, p1).

The current appearance of the soundproof wall installed in Korea is uniform in alumina material in the form of unpainted, and the exterior has many metallic intrinsic colors, so the aesthetics are not good and the urban aesthetics do not meet the trend of individualization and colorization of the design (Industries) Textile, 1978, October, p95, Textile Month 1979, p27 and JP 5051795). Low-rise residents of apartments or buildings with soundproof walls not only feel the monotony and boredom that comes from simple silver, but some homeowners are also opposing the installation of soundproof walls because of lower housing prices. In addition, the existing A1 soundproof wall is discolored due to oxidation in the air and contact with soot. In order to clean it, it has to be wiped off with expensive specialty chemicals, and the metallic natural luster can reflect the headlight of the car, which affects safe driving. Can be.

In addition, since aluminum is not produced in Korea but is imported in its entirety, precious foreign currency is consumed by importing materials required for making soundproof walls.

For this reason, there is an example of applying the stainless steel plate to the soundproof wall disc material without using aluminum material (Oct 1994, p78). However, due to the high cost and difficulty of pre-painting the original plate, it is difficult to apply it.

In order to solve the above problems, the present invention uses a hot-dip galvanized steel sheet instead of an aluminum material, and forms a chromate coating and a coating layer having an appropriate thickness on the steel sheet, thereby providing excellent coating adhesion, processability, and corrosion resistance. To improve the steel sheet, the purpose is.

In addition, an object of the present invention is to provide a steel plate for soundproof wall outer plate having excellent coating adhesion, processability, surface corrosion resistance as well as cross-sectional corrosion resistance by performing a corrosion resistance improvement treatment after processing using the steel color coated steel sheet.

The present invention is a steel color sheet steel sheet made of a hot-dip galvanized steel sheet, the lower coating layer made of a chromate coating film of 20 to 100 mg / ㎡, epoxy resin or polyester resin on the surface of the hot-dip galvanized steel sheet, and The present invention relates to a steel color-coated steel sheet in which an upper coating layer made of a polyester resin is formed in sequence.

In addition, according to the present invention, in the method for manufacturing a soundproof wall outer plate, a chromate film is formed on the surface of a hot-dip galvanized steel sheet with an adhesion amount of 20 to 100 mg / m 2, and a coating liquid made of epoxy resin or polyester resin is formed on the chromate film. Coating to form a lower coating layer, coating a coating liquid made of a polyester resin on the lower coating layer to form an upper coating layer to produce a steel color coated steel sheet, and then mechanically processing the steel color coated steel sheet with a soundproof wall material After performing the process, the part exposed by the above process to the soundproof wall outer plate steel sheet using a steel color coated steel sheet which is treated by one method selected from the group consisting of a transparent coating method, a phosphate treatment method, a chromate treatment method and an electrodeposition coating method. It is about.

Hereinafter, the present invention will be described in more detail.

In the present invention, the hot-dip galvanized steel sheet is degreased using a hot-dip galvanized steel sheet as a base steel plate, and chromate treatment having an adhesion amount of 20 to 100 mg / m 2 is applied to the surface of the de-hot dip galvanized steel sheet by coating treatment. .

This is because when the chromate coating amount is 20 mg / m 2 or less, the chromate coating amount is too small to deteriorate the corrosion resistance, whereas in the chromate coating amount that is 100 mg / m 2 or more, the coating film workability is deteriorated. Therefore, in this invention, the chromate coating amount is limited to 20-100 mg / m <2>.

In the present invention, after forming the chromate film, a lower coating layer is formed by using a polyester or epoxy resin system.

When the coating thickness of the lower coating layer (lower coating) of the coated steel sheet is 2 µm or less, the adhesion with the upper coating layer (upper coating) is degraded and the corrosion resistance is poor. When the coating thickness is 8 µm or more, the workability is degraded. Therefore, it is preferable to set the lower coating layer coating film thickness of polyester resin type or epoxy resin type to 2-8 micrometers.

In addition, in forming the lower coating layer, when the baking temperature is 180 ° C. or lower, curing after coating of the polyester or epoxy resin is incomplete, resulting in deterioration of adhesion and workability with the upper coating layer, and deterioration of corrosion resistance and weather resistance. When the temperature is 220 ° C. or more, the epoxy coating film is overcured to degrade adhesion to the upper coating layer, thereby degrading workability, corrosion resistance and weather resistance. Therefore, the baking temperature of the lower coating layer is preferably set to 180 ~ 220 ℃.

In the present invention, the upper coating layer is formed using a polyester resin system. When the upper coating layer is formed using the polyester resin, the coating film thickness is preferably limited to 10 to 25 μm. The reason is that when the coating film thickness is 10 μm or less, the coating film thickness is too thin to provide corrosion resistance, weather resistance and If the color stability (hiding force) is deteriorated, and the thickness is 25 µm or more, the cost is added as much as the thickness of the coating, and the thickness of the coating can be increased, resulting in delamination between the lower coating layers. Deteriorate Therefore, when forming an upper coating layer by polyester resin type, it is preferable to limit the coating film thickness to 10-25 micrometers, and can change a color by adding a pigment.

In addition, the baking temperature for forming the upper coating layer is preferably limited to 190-250 ℃, the reason is that under 190 ℃ coating film hardness due to incomplete curing after coating, solvent resistance, corrosion resistance and the like, If the temperature is higher than 250 ℃ the color of the upper coating layer is discolored because the appearance of the product deteriorates.

In the present invention, the upper and lower coating layers may be coated by a conventional coating method, and a preferred coating method may be a roll coating method.

Piercing (hole) and roll forming processing are performed in the soundproof wall processing plant using the color coated steel sheet manufactured by the above method. When piercing processing, iron, which is a base material of the hot-dip plated steel sheet, As it is exposed as it is, corrosion resistance becomes poor and the soundproof wall with a beautiful surface appearance is not worth it. Therefore, in order to secure the cross-sectional corrosion resistance, one method should be selected from a transparent coating method, a phosphate treatment method, a chromate treatment method or an electrodeposition coating method. Among them, the most preferred method is electrodeposition coating method.

First, the squeezing and spraying methods may be applied to the transparent paint application method. The application of such a transparent paint is somewhat poor surface appearance, but the desired cross-sectional corrosion resistance can be obtained to some extent.

Next, the chromate treatment method may apply deposition or spraying. In this case, the chromate solution may be a solution usually used in the plating factory.

Next, a phosphate treatment method can be performed by a conventional method.

Next, in order to obtain the cross-sectional corrosion resistance by electrodeposition coating method, it is preferable to limit the voltage applied to the color steel sheet to 100 ~ 400 volts. The reason is that the electrodeposition coating film formed to be 100 volts or less is not sufficient to show satisfactory cross-sectional corrosion resistance, whereas if it is 400 volts or more, it can cover the exposed iron portion of the piercing site to secure sufficient cross-sectional corrosion resistance, but not piercing. Electrode coating film is formed and bubbling is formed even on the soundproof wall surface of the damaged wall, which damages the beautiful surface appearance which is the main advantage of the color steel sheet. Therefore, the treatment in the above range can ensure excellent surface appearance and cross-sectional corrosion resistance.

Corrosion resistance greatly depends on the piercing processing direction of the coated steel sheet for the soundproof wall outer plate. If the processing direction from the top to the bottom rather than roll forming by performing the processing direction from the bottom to the top, it is advantageous to ensure even better cross-sectional corrosion resistance when treated in a method for securing the surface corrosion resistance.

Hereinafter, the present invention will be described in more detail with reference to Examples.

(Example 1)

Alkaline degreasing solution adhered to the surface during degreasing by removing water and contaminants from the hot dip galvanized steel sheet with a coating weight of 150 g / m2 (Z27) for color coating in the color coating line after degreasing. Was removed and pre-painted (chromated) was subjected to the chromate solution (Dae Parker ZM 1300 AN) under the conditions shown in Table 1 below.

As described above, using the chromate-treated specimen, which is a pre-painting treatment, the coating treatment was performed in a 2 coat / 2 bake manner as shown in Table 1 below.

As described above, the coating adhesion (planar and processing) coating processability, coating impact resistance and corrosion resistance of the pre-painted and coated specimens are shown in Table 2 below.

The film adhesion in the following Table 2 is to stick the coating film of the specimen to the coated steel sheet at regular intervals of 1 mm, and to adhere the surface of the Scotch vinyl tape to the flat part and the Eriksen 6 mm extruded part, and then peel off the coating film. The degree of coating processability was strongly bent (curvature radius 2T, where T is the thickness of the specimen), and then the scotch vinyl tape was adhered and peeled on the curved surface, and then the film peeling state was evaluated.

In addition, the coating impact was evaluated by using a DuPont impact tester to drop the weight on the surface of the coated steel sheet from the height of 50㎝ to evaluate the degree of cracking in the coating. The weight used was 500 ± 1g and the tip diameter of the weight was 12.7 ± 0.06mm.

On the other hand, after corrosion of X-shaped scratches on the coated steel sheet, the salt spray test (5% NaCl, 35 ℃, spray pressure 1kg / ㎡) is carried out for 500 hours to swell the coating film and white blue or near X The degree of proper occurrence was evaluated.

Table 1

[Table 2]

◎ ○ △ X

← Good inferiority →

As shown in Table 2, the adhesion of the chromate to the surface of the hot-dip galvanized steel sheet is secured at 10 g / m 2 (Comparative Example 5), but the coating adhesion and impact resistance are deteriorated, but the corrosion resistance is deteriorated, whereas at 120 g / m 2 (Comparative Example 6) It can be seen that the coating film adhesion and workability is deteriorated.

On the contrary, it can be seen that the inventive examples (1 to 4) pre-painted and coated according to the present invention are excellent in coating film adhesion, processability, impact resistance and corrosion resistance.

(Example 2)

Piercing (hole) and roll forming processing in the soundproof wall processing plant using the coated steel sheet described in Example 1, chromate treatment, electrodeposition coating and transparent coating application to secure the cross-sectional corrosion resistance is shown in Tables 3, 4 and 5 Treated as In addition, the cross-sectional corrosion resistance and surface appearance were observed and the results are shown in Tables 3, 4 and 5, respectively.

Table 3

◎ ○ △ X

← Good inferiority →

Table 4

◎ ○ △ X

← Good inferiority →

Table 5

◎ ○ △ X

← Good inferiority →

As shown in Table 3, inventive examples (7, 8, and 9) having an appropriate range of chromate treatment time in order to secure cross-sectional corrosion resistance satisfy corrosion resistance and surface appearance, whereas comparative example (10) lacks treatment time. In order to ensure sufficient corrosion resistance, and in Comparative Example 11, the corrosion resistance is satisfied, but the surface of the coated steel sheet is damaged due to long time treatment. In other words, it can be seen that the chromate treatment brings about improved cross-sectional corrosion resistance.

As shown in Table 4, the inventive examples (12, 13, 14, and 15) satisfy the corrosion resistance and the surface appearance of the electrodeposition coating, whereas the comparative example (16) shows the lack of sufficient coating due to the insufficient processing voltage. In the case of Comparative Example (17), which satisfies the corrosion resistance by forming, it satisfies the corrosion resistance, but it is not selectively electrodeposited due to long time treatment, but the coating film is formed on the whole coated steel sheet to damage the surface such as the beautiful appearance of the coated steel sheet. . That is, it was found that the cross-sectional corrosion resistance is improved by electrodeposition coating.

As shown in Table 5, in the case of coating the transparent coating by applying the transparent coating, the cross-sectional corrosion resistance and surface appearance have achieved the object of the present invention to some extent, but when the transparent coating is applied by applying squeegee, the transparent coating flow Although the surface is damaged due to the back, it can be seen that the corrosion resistance is secured to some extent.

When the steel sheet for soundproof wall outer plate provided in the present invention as described above is applied to the soundproof wall, it is possible to improve the appearance of the city and create a fresh image by realizing dozens of various graphic colors. It does not change the black condition due to the effects of soot and corrosion, and the attachments such as dirt and dust can be washed with rain water or general purpose water.Also, aluminum is imported from all over the world. Very high.

Claims (9)

In the steel collar sheet steel sheet made of hot-dip galvanized steel sheet, Steel, characterized in that the surface of the hot-dip galvanized steel sheet is formed with a chromate film having an adhesion amount of 20 to 100 mg / m 2, a lower coating layer made of epoxy resin or polyester resin, and an upper coating layer made of polyester resin. Prepainted Steel Sheet. The method of claim 1, Steel coating color steel sheet, characterized in that the coating film thickness of the lower coating layer is 2 ~ 8㎛. The method according to claim 1 or 2, Steel coating color steel sheet, characterized in that the coating film thickness of the upper coating layer is 10 ~ 25㎛. In the manufacturing method of the steel plate for soundproof wall outer plate, A chromate film is formed on the surface of the hot-dip galvanized steel sheet with an adhesion amount of 20 to 100 mg / m 2, and a coating liquid made of epoxy resin or polyester resin is coated on the chromate film to form a lower coating layer, and a poly coating on the lower coating layer. After coating the coating liquid consisting of an ester resin system to form an upper coating layer to produce a steel color coated steel sheet, and then subjected to the mechanical processing of the steel color coated steel sheet with a soundproof wall material, the area exposed by the processing, the transparent paint A method for producing a soundproof wall outer plate using a steel color coated steel sheet, characterized in that it is treated by one method selected from the group consisting of a coating method, a phosphate treatment method, a chromate treatment method and an electrodeposition coating method. The method of claim 4, wherein The coating film thickness of the lower coating layer is formed to 2 ~ 8㎛, and the coating film thickness of the upper coating layer to form a steel sheet for soundproof wall outer plate using a steel color coated steel sheet, characterized in that formed. The method according to claim 4 or 5, After coating the coating liquid when forming the lower coating layer, the method for producing a soundproof wall outer plate using a steel color coated steel sheet, characterized in that to form a lower coating layer by baking in a temperature range of 180 ~ 220 ℃. The method according to claim 4 or 5, After coating the coating liquid when forming the lower coating layer, the method for producing a soundproof wall outer plate using a steel color coated steel sheet, characterized in that to form a lower coating layer by baking in a temperature range of 190 ~ 250 ℃. The method according to claim 4 or 5, The upper and lower paint layers are formed by a roll coating method. The method according to claim 4 or 5, When the electrodeposition coating treatment of the exposed part by mechanical processing, the electrodeposited coating film is formed by applying a voltage of 100 ~ 400 volts.