KR101363936B1 - Anticorrosive processed steel sheet and its manufacturing method - Google Patents

Abstract

The present invention relates to a steel sheet that has been removed from the steel sheet and subjected to antirust treatment, and more particularly, to a rust preventive coating layer formed on the outer surface of the steel sheet and the steel sheet from which the scale has been removed and the rustproof coating layer formed on the outer surface of the rustproof film. The anti-corrosion film is formed by applying an ethanolamine and / or zirconium ion solution, and the anti-corrosion coating layer is formed by applying a synthetic resin solution, so that the anti-corrosive oil is not used for easy storage and transportation, and the anti-rust oil is removed separately. It can be used by applying the paint immediately without the process can reduce the cost and time, and to the end-use process to the rust-treated steel sheet and harmless to the environment and its manufacturing method.

Description

Anti-rust treated steel sheet and its manufacturing method {Anticorrosive processed steel sheet and its manufacturing method}

The present invention relates to a steel sheet that has been removed from the steel sheet and subjected to antirust treatment, and more particularly, to a rust preventive coating layer formed on the outer surface of the steel sheet and the steel sheet from which the scale has been removed and the rustproof coating layer formed on the outer surface of the rustproof film. The anti-corrosion film is formed by applying an ethanolamine and / or zirconium ion solution, and the anti-corrosion coating layer is formed by applying a synthetic resin solution, so that the anti-corrosive oil is not used for easy storage and transportation, and the anti-rust oil is removed separately. It can be used by applying the paint immediately without the process can reduce the cost and time, and to the end-use process to the rust-treated steel sheet and harmless to the environment and its manufacturing method.

Steel plate made of steel and having a plate form is mainly divided into hot rolled steel sheet and cold rolled steel sheet, and is used in building, bridge, vehicle, ship, electronic products, etc. Since scales (rust) such as iron (II) oxide, iron (III) oxide, and triiron tetraoxide are formed on the surface, the steel sheet is finally used after removing the scale from the surface and applying paint. Since the process of removing the scale from the steel sheet requires a complicated and special apparatus, conventionally, a steel sheet manufacturer removes the scale from the steel sheet and then applies the rust preventive oil to prevent the scale from slipping on the steel sheet. 'Oil coated steel sheet' was manufactured and sold.

However, conventional oil-coated steel sheet is inconvenient to transport and store because it is coated with rust preventive oil, and in order to apply paint and finally use it, it is necessary to remove the rust preventive oil applied to the steel sheet in advance and it takes much time and cost. Hazardous chemicals have been used to remove the oil, which has the problem of damaging the environment and human body. Even in the above-mentioned problems, steel makers manufacturing steel sheet until recent years are extremely limited, and there is a market focused on suppliers, that is, a market in which only unscaled steel sheets or oil coated steel sheets are manufactured and sold. There was little need to develop and sell the steel sheet which was not coated but which was rust prevented.

However, in recent years, many new steelmakers have appeared in Korea and China, and competition among the steelmakers has been intensifying, and the market for manufacturing and selling steel sheet is rapidly changing from a supplier-oriented market to a consumer-oriented market. There is a need for the development of anti-corrosive steel sheets that meet the needs of consumers.

Therefore, it is easy to store and transport by not using anti-rust oil in the anti-rust process, and can be used by applying paint immediately without removing the anti-rust oil. The need for harmless rust-treated steel sheets is increasing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

It is an object of the present invention to provide a rust-treated steel sheet and a method of manufacturing the same that can provide a rust-preventing effect without using an rust-preventing oil.

In addition, the present invention forms a rustproof film and / or a rustproof coating layer on the de-scaled steel sheet, easy to store and transport, can be used by applying a paint immediately can reduce the cost and time, and in the final use process An object of the present invention is to provide a steel plate and a method of manufacturing the same, which are rust-treated to the environment.

In addition, an object of the present invention is to provide a rust-prevented steel sheet having a rust prevention time and rust prevention efficiency according to the user's request and a method of manufacturing the same.

In addition, the present invention is superior to the conventional rust-prevented steel sheet without the use of rust-prevented oil, and further comprising a rust-prevented oil layer, and further comprising a rust-prevented steel sheet and a rust-prevented steel sheet significantly improved The purpose is to provide a manufacturing method.

In order to achieve the above object, the present invention is implemented by the following embodiments.

According to an embodiment of the present invention, the rust-treated steel sheet according to the present invention includes a steel sheet from which the scale is removed, and a rust-proof film formed on the outer surface of the steel sheet, the rust-proof film is formed by applying an ethanolamine or zirconium ion solution It is characterized by.

According to another embodiment of the present invention, the rust-treated steel sheet according to the present invention includes a steel sheet from which the scale is removed, and an anti-corrosion coating layer formed on the outer surface of the steel sheet, wherein the anti-rust coating layer is formed by applying a synthetic resin solution It is done.

According to another embodiment of the present invention, the rust-treated steel sheet according to the present invention further comprises a rust-proof coating layer formed on the outer surface of the rust-proof film, the rust-proof coating layer is characterized in that the synthetic resin solution is applied.

According to another embodiment of the present invention, in the rust-prevented steel sheet according to the present invention, the rustproof membrane is formed by applying a first rustproof membrane formed by applying a zirconium ion solution, and an ethylene amine applied to the outer surface of the first rustproof membrane. It comprises a first rustproof film, wherein the synthetic resin is characterized in that the polyethylene resin or polypropylene resin is used.

According to another embodiment of the present invention, in the method of manufacturing a rust-treated steel sheet according to the present invention, the manufacturing method is a scale removal step of removing the scale from the steel sheet, and the synthetic resin to the steel sheet from which the scale is removed in the scale removal step It characterized in that it comprises a rust coating step of coating to form a rustproof coating layer of a predetermined thickness.

According to another embodiment of the present invention, in the manufacturing method of the rust-treated steel sheet according to the present invention, the descaling step is an acid treatment step of dissolving and removing the scale by immersing the steel plate in an acidic solution, and in the acidic acid treatment step It characterized in that it comprises a rust solution solution step of forming a rust preventive film by spraying the rust preventive solution to the steel sheet is removed scale.

According to another embodiment of the present invention, in the method for manufacturing a rust-treated steel sheet according to the present invention, the anti-rust coating step is a resin coating step of applying a synthetic resin solution to the steel sheet is removed scale, the synthetic resin in the resin coating step It is characterized in that it comprises a post-treatment step of forming a rustproof coating layer by heat treatment and cooling the steel plate coated with the solution.

According to another embodiment of the present invention, in the manufacturing method of the rust-treated steel sheet according to the present invention, the descaling step is an acid treatment step of dissolving and removing the scale by immersing the steel plate in an acid solution, and in the acidic acid treatment step Antirust solution treatment step of applying a zirconium ion solution to the descaled steel sheet to form a first rustproof film, and a second rustproof film to form a first rustproof film by applying ethylene amine to the steel sheet formed with the first rustproof film in the rustproof solution treatment step An anti-rust solution treatment step, wherein the anti-rust coating step is a resin coating step for applying a synthetic resin solution to the steel sheet is removed scale, and the heat treatment and cooling the steel plate coated with a synthetic resin solution in the resin coating step to prevent rust on the outer surface of the anti-rust film It characterized in that it comprises a post-treatment step of forming a coating layer.

According to another embodiment of the present invention, the synthetic resin in the method for producing a rust-treated steel sheet according to the invention is characterized in that consisting of a polyethylene resin or polypropylene resin.

According to another embodiment of the present invention, in the method of manufacturing a rust-treated steel sheet according to the invention the acid solution has a temperature of 70 to 90 ℃, the heat treatment in the post-treatment step has a temperature of 160 to 200 ℃ It is carried out by spraying the heated air to the steel sheet, the cooling is characterized in that the cooling is performed by spraying the cooling steel having a temperature of 16 to 20 ℃ to the steel sheet.

According to another embodiment of the present invention, the anti-rust treated steel sheet according to the present invention further comprises an oil treatment step of forming an anti-rust oil layer by applying an anti-rust oil to the outer surface of the anti-rust coating layer formed in the anti-rust coating step. It features.

According to still another embodiment of the present invention, in the method of manufacturing a rust-treated steel sheet according to the present invention, the rust-preventing apparatus includes a steel plate conveying unit for transferring a steel sheet; A scale removing unit for removing scales from the steel sheet transferred by the steel plate transferring unit; The anti-corrosion coating unit to form a rust preventive coating layer by coating the steel sheet descaled by the descaling unit with a synthetic resin, wherein the descaling unit is immersed in an acidic solution to the steel sheet conveyed by the steel sheet transfer unit to scale An acid treatment part for dissolving and removing it, and an anti-corrosion solution treatment part for forming an anti-corrosion film on the steel plate by applying an anti-rust solution to the steel sheet descaled by the acid treatment part, wherein the anti-corrosion coating part is descaled by the scale removing part. Coating means for applying a synthetic resin solution to the steel sheet, and post-treatment means for forming a rust-preventing coating layer on the outer surface of the rustproof film by heat-treating and cooling the steel plate coated with the synthetic resin solution by the coating means, wherein the acid treatment part is acidic. An acid solution container containing a solution, and connected to the acid solution container to be accommodated in the acid solution container Temperature control means for controlling the temperature of the acidic solution, and the collecting means for collecting the vaporized acidic solution generated in the process of removing the scale from the steel plate located on the upper side of the acidic solution container, the rust preventive solution is ethanol An amine or zirconium ion solution is used, and the synthetic resin is characterized in that polypropylene resin or polyethylene resin is used.

The present invention can obtain the following effects by the above-described embodiment, the constitution described below, the combination, and the use relationship.

The present invention has the effect of providing the rust preventive effect without using the rust preventive oil.

In addition, the present invention forms a rustproof film and / or a rustproof coating layer on the de-scaled steel sheet, easy to store and transport, can be used by applying a paint immediately can reduce the cost and time, and in the final use process Harmless to the environment.

In addition, the present invention has the effect of having a rust prevention time and rust prevention efficiency according to the user's request.

In addition, the present invention is superior to the conventional rust-prevented steel sheet even without the use of rust-proof oil, and further has an effect of remarkably improving the rust-prevention efficiency by additionally including an anti-rust oil layer.

1 is a cross-sectional view of a rust-treated steel sheet according to an embodiment of the present invention.
2 is a flow chart showing a method of manufacturing a rust-treated steel sheet according to an embodiment of the present invention.
Figure 3 is a perspective view schematically showing an anti-rust treatment apparatus used for the production of a rust-treated steel sheet according to an embodiment of the present invention.
Figure 4 is a schematic diagram of the anti-rust treatment apparatus used for the production of a rust-treated steel sheet according to an embodiment of the present invention.
5 is a block diagram of an anti-rust treatment apparatus used for the production of a rust-treated steel sheet according to an embodiment of the present invention.
6 is a configuration diagram for explaining an acid treatment unit used in the rust prevention treatment apparatus shown in FIGS.
7 is a configuration diagram for explaining the rust preventing solution processing unit and the drying unit used in the anti-rust treatment apparatus shown in FIGS.
Figure 8 is a block diagram for explaining the coating means used in the antirust treatment apparatus shown in Figures 3 to 5.
Figure 9 is a block diagram for explaining the post-treatment means used in the rust prevention treatment apparatus shown in Figs.
10 to 12 is a reference diagram for explaining a process of manufacturing a rust-treated steel sheet using the anti-rust treatment device shown in FIGS.
13 to 14 is a reference picture for explaining the anti-rust effect of the rust-treated steel sheet according to an embodiment of the present invention.

Hereinafter will be described in detail with reference to the accompanying drawings, the rust-treated steel sheet according to the present invention and a manufacturing method thereof. Unless otherwise defined, all terms in this specification are equivalent to the general meanings of the terms understood by those skilled in the art and if they conflict with the meanings of the terms used in the present specification. Follow the definition used in the specification. Further, the detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a cross-sectional view of a rust-treated steel sheet according to an embodiment of the present invention, Figure 2 is a flow chart showing a method of manufacturing a rust-treated steel sheet according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention 4 is a perspective view schematically showing an rust preventive treatment apparatus used for manufacturing a rust preventive steel sheet according to an embodiment, and FIG. 4 is a schematic view of a rust preventive treatment apparatus used for manufacturing a rust preventive steel sheet according to an embodiment of the present invention; FIG. 5 is a block diagram of an anti-rust treatment apparatus used to manufacture a rust-treated steel sheet according to an embodiment of the present invention, and FIG. 6 illustrates an acid treatment unit used in the anti-rust treatment apparatus shown in FIGS. 7 is a block diagram illustrating the rust preventing solution treatment unit and the drying unit used in the rust prevention treatment apparatus shown in FIGS. 3 to 5, and FIG. 8 is a coating used for the rust prevention treatment apparatus shown in FIGS. Means 9 is a configuration diagram for explaining the post-treatment means used in the rust prevention treatment apparatus shown in FIGS. 3 to 5, and FIGS. 10 to 12 show the rust prevention treatment apparatus shown in FIGS. Figure 13 is a reference diagram for explaining the process of manufacturing a rust-treated steel sheet, Figure 13 to 14 is a reference picture for explaining the rust prevention effect of the rust-treated steel sheet according to an embodiment of the present invention.

Referring to Figure 1, the rust-treated steel sheet according to an embodiment of the present invention is formed on the outer surface of the steel sheet 100, the rustproof film 300 formed on the outer surface of the steel sheet 100 and the rustproof film 300 Including the anti-corrosive coating layer 400, it is easy to store and transport, and can be used by immediately applying the paint can reduce the cost and time, it is characterized in that harmless to the human body and the environment in the final use process.

The rust preventive film 300 is formed by forming an anti-rust solution on the outer surface of the steel sheet 100 from which the scale is removed, and prevents the scale from being formed on the steel sheet 100 for a predetermined period. As the rust preventive solution, ethanolamine and / or zirconium ion solution may be used. The zirconium ion solution is a solution made by dissolving zirconium in an acidic solution, and zirconium is present in an acidic solution in an ionic state. When the zirconium ion solution is applied to the steel sheet 100, the solution is dried, and a zirconium film is formed on the steel sheet. The rustproof film 300 may include a first rustproof film (not shown) formed by applying a zirconium ion solution and a second rustproof film (not shown) formed by applying ethanolamine to an outer surface of the first rustproof film. have.

The anti-corrosion coating layer 400 is formed by applying a synthetic resin solution to the outer surface of the rust-proof film 300, heat treatment and cooling, to prevent the scale is formed on the steel sheet (100). The synthetic resin is preferably a polyolefin resin, more preferably a polyethylene resin, polypropylene resin is used. The synthetic resin is preferably used 0.6 to 1g per 1 m 2 of the steel sheet.

The rust-treated steel sheet (not shown) according to another embodiment of the present invention may exist only the rust-proof film 300 without the rust-resistant coating layer 400, the rust-treated steel sheet (not shown) according to another embodiment of the present invention The anti-corrosion coating layer 400 may be formed directly on the outer surface of the steel sheet 100 without the anti-corrosion film 300. The rust-prevented steel sheet having only the rust-preventing film 300 has the effect of temporary rust prevention within approximately several days, and the rust-treated steel sheet having only the rust-preventing coating layer 400 has a long-term anti-rust effect of about several months.

The rust-treated steel sheet (not shown) according to another embodiment of the present invention further includes an rust-proof oil layer (not shown) formed on the outer surface of the steel sheet described with reference to FIG. 1, that is, on the outer surface of the rust-resistant coating layer 400. do.

The anti-rust oil layer is formed by applying anti-rust oil to the outer surface of the anti-corrosion coating layer 400, to prevent the scale is formed on the steel sheet (100). The rust-prevented steel sheet prevents the rust-preventing film 300, the rust-coating layer 400 and the oil layer from being formed on the steel sheet 100 in threefold, thereby maximizing the rust-preventing effect.

Hereinafter, with reference to Figures 3 to 12 first described the anti-rust treatment apparatus used to manufacture a rust-treated steel sheet according to an embodiment of the present invention, a method of manufacturing a rust-treated steel sheet using the rust-preventing device This will be described in detail.

The anti-corrosive treatment apparatus used to manufacture the anti-corrosive steel sheet according to an embodiment of the present invention includes an uncoiler 1 that unwinds the coiled steel sheet 100 from its outer circumference, and a steel sheet released from the uncoiler 1 ( Steel plate conveying unit (2) for transferring to prevent the rust treatment 100, a scale removing unit (3) for removing the scale from the steel plate 100 transferred by the steel plate conveying unit (2), and the scale removing unit ( The steel sheet 100, the scale of which has been removed by 3), is coated with a synthetic resin to form an anti-corrosive coating layer 400, and a steel sheet on which the anti-corrosive coating layer 400 is formed by the anti-corrosive coating portion 4. And a recoiler 5 for winding 100 in a coil form, and a control unit 6 for removing the entire operation of the rust prevention treatment apparatus.

The steel plate conveying unit 2 is the steel sheet 100 so that the steel sheet 100 released from the uncoiler 1 passes through the scale removing unit 3, the rust-preventing coating unit 4, and the recoiler 5 in order. ), A configuration such as a shaft 21, a roller 22, a drive unit (not shown).

The shaft 21 is connected to a driving unit to be described later, and rotates by the operation of the driving unit. The shaft 21 is fitted with a roller 22 to be described later.

The roller 22 is fitted to the shaft 21 to rotate together with the shaft 21, the recoiler 5 in the uncoiler 1 to the steel sheet 100 in contact with the outer surface of the roller 22 Move in the direction of. The roller 22 has a certain shape and a certain material, but preferably has a cylindrical shape that is vertically penetrated, and the elastic force is made of a material.

The drive unit is connected to the shaft 21 to rotate the shaft 21, for example, a drive motor may be used. The steel plate conveying unit 2 is located below the steel plate 100 or in a pair symmetrically above and below the steel plate 100.

The scale removing unit 3 is configured to remove the scale from the steel plate 100 transferred by the steel plate conveying unit 2, and includes an acid treatment unit 31, a washing unit (not shown), and an antirust solution treatment unit 32. And a drying unit 33 or the like.

The acid treatment unit 31 is configured to dissolve and remove the scale formed on the outer surface of the steel plate 100 by immersing the steel plate 100 transferred by the steel plate transfer unit 2 in the acid solution (A), acid solution Tank 311, control pump 312, acid solution container 313, temperature control means 314, collecting means 315, recovery tank 316 and the like.

The acid solution tank 311 is configured to store an acid solution, for example, may be formed in a variety of shapes, such as cylindrical, rectangular, and the like material such as FRP (fiber-reinforced plastic) to prevent corrosion caused by the acid solution It may be made of. The acid solution tank 311 is preferably buried underground to prevent a safety accident that may occur when the acid solution is leaked. Hydrochloric acid (concentration 10-20%) may be used as the acid solution stored in the acid solution tank 311.

The control pump 312 is one end is connected to the output terminal of the acid solution tank 311 to supply the acid solution to the acid solution 313, the control pump 312 is to adjust the strength of the output The amount of acid solution can be adjusted. For example, the control pump 312 may be a "YAD-12211 (1/2") model of the Daelim flow meter.

The acid solution container 313 is configured to receive and receive the acid solution stored in the acid solution tank 311, and is connected to the output terminal of the control pump 312. The acid solution container 313 has various shapes and materials, but preferably has a shape of a rectangular parallelepiped cylinder with an open top surface and is made of a plastic or ceramic material that is not corroded by an acid solution. The acid solution container 313 may be installed in two or more lines in order to increase the efficiency of the transfer and descaling of the steel sheet 100. The acid solution contained in the acid solution container 313 preferably has a temperature of 70 to 90 ° C. Since the steel sheet 100 transferred by the steel plate conveying unit 2 is immersed in the acidic solution A stored in the acidic solution container 313 for a predetermined period of time, and then transferred to the rustproof solution processing unit 32 to be described later. The scale formed on the outer surface of the steel sheet 100 is melted and removed by the acid solution.

The temperature control means 314 is connected to the acid solution container 313 as a means for controlling the temperature of the acid solution stored in the acid solution container 313, for example, a heating heater may be used.

The collecting means 315 is located above the acid solution container 313 and collects the vaporized acid solution generated in the process of removing the scale from the steel plate 100. For example, a fan for introducing air Can be used.

The recovery tank 316 is connected to the acid solution container 313 and the collecting means 315, respectively, to recover the contaminated hydrochloric acid in the process of removing the scale of the steel sheet 100, corrosion by the acid solution It is preferably made of a plastic or ceramic material.

The washing unit (not shown) is configured to remove hydrochloric acid from the steel sheet by spraying water on the steel sheet 100 from which the scale is removed from the acid treatment unit 31, and thus a general water tank and a spray nozzle are used. Will be omitted.

The anti-rust solution treatment part 32 is applied to the anti-rust solution to the steel sheet 100, the scale is removed by the acid treatment unit 31 and the residual hydrochloric acid is removed by the washing unit to prevent the anti-corrosive film 300 ), And a configuration such as the antirust solution tank 321, the control pump 322, the solution injection unit 323 and the like.

The rust preventive solution tank 321 is configured to store the rust preventive solution, for example, may be formed in various shapes such as cylindrical, rectangular, etc., and may be formed of various materials such as plastic that does not cause corrosion. As the rust preventive solution stored in the rust preventive solution tank 321, ethanolamine or zirconium ion solution is preferably used.

The control pump 322 is one end is connected to the output end of the rust solution tank 321 to supply the rust solution to the solution injection unit 323 described later, the control pump 322 is to adjust the strength of the output The amount of rust preventive solution can be adjusted.

The solution spraying unit 323 has a pair of upper and lower symmetrical intervals at predetermined intervals to spray the rust preventive solution provided from the rust preventive solution tank 321 to the surface of the steel sheet 100, the control pump 322 It is connected to the output terminal of. As the solution injection unit 323, for example, a spray nozzle of a spraying system Korea's "wide-angle circular injection (setup No. 26)" model may be used. The rust preventive film is formed on the steel sheet by the rust preventing solution sprayed by the solution spraying unit 323 so that the scale does not sludge on the steel sheet 100 for a predetermined period of time.

The drying unit 33 is configured to dry the steel plate 100 by supplying hot air to the steel plate 100 that has passed through the rust preventing solution treatment unit 32, and the air supply unit 331 and the control valve 332. And an air injection unit 333.

The air supply unit 331 is configured to heat the outside air to provide to the air injection unit 333, for example, a warm air fan may be used.

The control valve 332 is one end is connected to the output terminal of the air supply unit 331 to adjust the amount of air supplied to the air injection unit 333, for example, a ball valve type 2-way valve may be used. have.

The air injection unit 333 is installed in a pair up and down symmetrically at regular intervals to dry the steel plate 100 by spraying the heated air supplied from the air supply unit 331 on the surface of the steel plate 100 In configuration, it is connected to the output end of the control valve (332). For example, the spray nozzle 333 may be used.

The scale removing unit (not shown) used in the manufacture of the steel sheet according to another embodiment of the present invention is a washing unit (not shown) between the rust preventing solution processing unit 32 and the drying unit 33 of the scale removing unit 3. C) and a second anti-corrosive solution treatment unit (not shown) may be further included. The descaling unit and the second anti-corrosive solution treatment unit respectively correspond to the decontamination unit 3 and the anti-corrosive solution treatment unit 32. The anti-rust solution treatment unit 32 is a zirconium ion solution as an anti-rust solution. This is used, and the second rust preventing solution treatment part is to use ethanolamine.

The anti-corrosive coating unit 4 is a structure for forming the anti-corrosive coating layer 400 by coating the steel sheet 100, the scale is removed by the scale removing unit 3 with a synthetic resin, coating means 41, post-treatment means (42) and the like.

The coating means 41 is configured to apply a synthetic resin solution to the steel sheet 100 from which the scale is removed, and includes a resin container 411, a transfer roller 412, a coating roller 413, and the like. Since the upper and lower surfaces of the steel plate 100 are all coated, the coating means 41 is provided with a pair of upper and lower parts at a predetermined interval.

The resin container 411 is configured to store the synthetic resin solution (B), but may have various shapes and materials, but preferably has a shape of a cylinder with an open top surface and is made of a material such as plastic or ceramic. The synthetic resin stored in the resin container 411 is preferably a polyolefin resin, more preferably polyethylene, polypropylene resin is used. The synthetic resin is preferably used 0.6 to 1g per 1 m 2 of the steel sheet.

The transfer roller 412 is the outer surface is in contact with the synthetic resin solution (B) and the coating roller 413 stored in the resin container 411, it is configured to deliver the synthetic resin solution to the coating roller 413 by rotating. The transfer roller 412 may be formed by engaging one or two or more as shown in Figure 8 in a range that does not interfere with the steel sheet 100 to which the coating means 41 moves.

The application roller 413 rotates in engagement with the transfer roller 412 and receives the synthetic resin solution stored in the resin container 411 to apply the synthetic resin solution to the surface of the steel sheet 100. The coating means 41 described above is for a roll coating method using a roller, the coating means 41 is a variety of coating methods including a spray coating method for spraying a synthetic resin to the steel sheet 100 through a nozzle coating It may be made of a configuration that can perform.

The post-treatment means 42 is a post-treatment structure to stably form the anti-rust coating on the steel sheet 100 coated with a synthetic resin solution, such as heat treatment unit 421, cooling unit 422, drying unit 423 Include configuration.

The heat treatment unit 421 is a configuration for evaporating and drying the solvent except the synthetic resin by heat-treating the steel sheet 100 coated with the synthetic resin solution, air supply unit 4211, control valve 4212, air injection unit 4213, etc. Includes the configuration of. Except for the difference in the temperature of the supplied air, the air supply unit 4211, the control valve 4212, and the air injection unit 4213 of the heat treatment unit 421 are each an air supply unit 331 of the drying unit 33. Since it corresponds to the control valve 332 and the air injection unit 333, a detailed description of the heat treatment unit 421 will be omitted. In the heat treatment unit 421, the temperature of the heated air injected into the steel sheet 100 preferably has 160 to 200 ° C.

The cooling unit 422 is configured to cool the synthetic resin and the steel sheet dried by the heat treatment unit 421 by supplying cooling water to the steel plate, the water tank (4221), the cooler (4222), the control pump (4223), water powder The configuration, such as the dead part 4224, is included.

The water tank 4221 is configured to store water, and may be formed in various shapes such as a cylindrical shape, a rectangular shape, and the like, and may be made of a material such as plastic to prevent corrosion.

The cooler 4202 is configured to lower the temperature of the water by cooling the water stored in the water tank 4221, and a conventional cooler 4202 operated by receiving power is used.

One end of the control pump 4223 is connected to an output end of the water tank 4221 to supply the water cooled to the cooler 4222 to the water spray unit 4224.

The water spraying unit 4224 is provided with a pair of upper and lower symmetry at a predetermined interval to inject the cooling water provided from the water tank 4221 to the surface of the steel plate 100, to the output end of the control pump 4223 Connected. The water spray unit 4224 may be a spray nozzle or the like. The temperature of the cooling water sprayed by the water spray unit 4224 preferably has 16 to 20 ° C.

The drying unit 423 is configured to dry the steel plate 100 by supplying hot air to the steel plate 100 that has passed through the cooling unit 422, and includes an air supply unit 4231, a control valve 4232, And a configuration such as an air injection section 4333. The air supply unit 4231, the control valve 4232, and the air injection unit 4333 of the drying unit 423 are respectively an air supply unit 331, a control valve 332, and an air injection unit of the drying unit 33 ( 333), a detailed description of the drying unit 423 will be omitted.

The control unit 6 is configured to control the entire operation of the rust prevention treatment apparatus, and operates the uncoiler 1, the scale removing unit 3, the rust preventing coating unit 4, the recoiler 5, and the like. To control.

An anti-rust treatment apparatus used to manufacture a rust-treated steel sheet according to another embodiment of the present invention is located between the anti-corrosive coating unit 4 and the recoiler 5, and the anti-corrosive coating layer (4) by the anti-corrosive coating unit 4 It further comprises an oil treatment (not shown) to form a rust preventive oil layer (not shown) by applying the anti-rust oil to the steel sheet 100 is formed 400. The oil treatment unit includes an oil container (not shown), a delivery roller (not shown), a coating roller (not shown), and the like. The oil container, the delivery roller, and the application roller of the oil treatment unit are different only from the application of oil instead of the synthetic resin, respectively, the resin container 411, the delivery roller 412, and the application roller 413 of the coating means 41. Since it corresponds to, the detailed description of the oil treatment unit will be omitted.

Using the rust prevention treatment apparatus described with reference to FIGS. 3 to 12, referring to FIGS. 1 to 12, a method of manufacturing the rust preventive steel sheet shown in FIG. 1) uncoil step (S1) to uncoil the steel sheet 100 wound in a coil shape using, and the steel sheet conveying step (S2) for transferring to the anti-corrosive treatment of the steel sheet 100 released in the uncoil step (S1) and , The scale removing step S3 of removing the scale 200 from the steel plate 100 transferred in the steel sheet transferring step S2, and the steel sheet 100 of which the scale 200 is removed in the scale removing step S3. Anti-corrosive coating step (S4) to form a rust-resistant coating layer 400 by coating a synthetic resin in, and using the recoiler (5) to wind the steel sheet 100 on which the rust-proof coating layer 400 is formed in the rust-proof coating step (S4) A recoil step (S5) and the like.

In the steel sheet conveying step (S2), the steel sheet conveying part (2) is operated so that the steel sheet (100) released from the uncoiler (1) is descaled (3), anti-corrosive coating part (4) and recoiler (5). Transferring the steel plate 100 so as to pass in turn.

The scale removal step (S3) is a step of removing the scale 200 from the steel plate 100 transferred in the steel plate transfer step (S2), acid treatment step (S31), washing step (S32), antirust solution treatment step (S33), drying step (S34) and the like.

The acid treatment step (S31) is a step of melting and removing the scale 200 by immersing the steel plate 100 transferred in the steel plate transfer step (S2) in an acid solution (A). As shown in FIG. 10, when the steel sheet 100 enters and passes through the acid treatment unit 31, the steel plate 100 contacts the acid solution A contained in the acid solution container 313 and then is washed. (Not shown). The scale 200 formed on the steel sheet 100 is melted and removed by the acid solution A while the steel plate 100 is immersed in the acid solution A. The acid solution used in the acid treatment step (S31) is preferably hydrochloric acid having a concentration of 10 to 20% and maintained at a temperature of 70 to 90 ℃.

The washing step (S32) is a step of removing residual hydrochloric acid by spraying water through the washing unit to the steel sheet 100, the scale is removed in the acid treatment step (S31).

The anti-rust solution treatment step (S33) is a step of forming an anti-rust film 300 on the steel plate 100 by spraying the anti-rust solution on the steel plate 100 after the washing step (S32). As shown in FIG. 10, when the steel sheet 100 enters and passes through the rust preventing solution processing unit 32, the control pump 322 operates to store the rust preventing solution stored in the rust preventing solution tank 321. It is supplied to the 323, the solution spray unit 323 sprays the rust preventive solution to the surface of the steel sheet 100 to form a rust preventive film (300). Ethanolamine or zirconium ion solution may be used as the rust preventive solution in the rust preventive solution treatment step (S33).

The drying step (S34) is a step of drying the steel sheet 100 after the anti-rust solution treatment step (S33). As shown in FIG. 10, when the steel sheet 100 enters and passes through the drying unit 33, the control valve 332 is opened to generate heated air from the air supply unit 331. Sprayed through), the steel sheet 100 is dried.

In the method of manufacturing a steel sheet according to another embodiment of the present invention, the descaling step (not shown) is a zirconium ion solution is used as the anti-rust solution in the anti-rust solution treatment step (S33), and then in the washing step (S32) After the corresponding second washing step (not shown), and then there is a difference that ethanolamine is used as the rust preventive solution after the second anti-rust solution treatment step (not shown) corresponding to the anti-rust solution treatment step (S33), After the drying step (S34) is passed. In the steel sheet subjected to the descaling step, a first rust preventive film having a zirconium film formed thereon and a second rust preventive film having an ethanolamine film formed on the outer surface of the first rust preventive film may be formed.

The antirust coating step S4 is a step of forming a rustproof coating layer 400 having a predetermined thickness by coating a synthetic resin on the steel sheet 100 from which the scale 200 is removed in the descaling step S3. S41), post-processing step (S42) and the like.

The resin coating step (S41) is a step of applying a synthetic resin solution (B) to the steel sheet 100, the scale 200 is removed in the scale removing step (S3). As shown in FIG. 11, when the steel sheet 100 from which the scale 200 is removed is introduced into the coating means 41 and passed through, the transfer roller 412 rotates and the synthetic resin solution stored in the resin container 411. (B) is supplied to the coating roller 413, the synthetic resin solution (B) is applied to a predetermined thickness on the upper and lower surfaces of the steel sheet 100 while the steel sheet 100 passes through the coating roller 413. . In the resin coating step (S41), 0.6 to 1 g of synthetic resin is used per 1 m 2 of steel sheet, and the synthetic resin is preferably a polyolefin resin, and more preferably a polyethylene resin or a polypropylene resin.

The post-treatment step (S42) is a step of post-treatment to stably form the anti-corrosive coating layer 400 on the steel sheet 100 coated with the synthetic resin solution (B) in the resin coating step (S41), heat treatment step (S421) , Cooling step (S422), drying step (S423) and the like.

The heat treatment step (S421) is a step of evaporating and drying the solvent in the synthetic resin solution (B) by supplying heating air to the steel sheet 100 coated with the synthetic resin solution (B) in the resin coating step (S41). As shown in FIG. 11, when the steel sheet 100 coated with the synthetic resin solution B is introduced into the heat treatment part 421 and passes through, the control valve 4212 is opened to generate the air supply part 4211. The heated air is sprayed onto the steel sheet 100 through an air spraying portion 4213, and the solvent of the synthetic resin solution B applied to the steel sheet 100 is evaporated and dried. In the heat treatment step (S421) is heated air of 160 to 200 ℃.

The cooling step (S422) is a step of supplying cooling water to the steel sheet 100 after the heat treatment step (S421) to cure the synthetic resin in a molten state to form an anti-corrosive coating layer 400 and to cool the steel sheet 100. As shown in FIG. 11, when the steel sheet 100 enters and passes through the cooling unit 422, the control pump 4223 operates so that the coolant stored in the water tank 4221 opens the water spray unit 4224. Sprayed to the steel sheet 100 through to harden the synthetic resin to form an antirust coating layer 400 and to cool the steel sheet 100. In the cooling step (S422), cooling water of 16 to 20 ℃ is supplied.

The drying step (S423) is a step of drying the steel sheet 100, the cooling water is buried in the cooling step (S422). As shown in FIG. 11, when the steel sheet 100 enters and passes through the drying unit 423, the control valve 4232 is opened so that the heated air generated from the air supply unit 4231 is formed by an air injection unit ( Sprayed through 4233 to dry the steel plate 100 on which the antirust coating layer 400 is formed. After the drying step (S423) after the rust-treated steel sheet 100 as shown in Figure 1 is produced.

The recoil step (S5) is a step of winding the steel sheet 100 on which the anti-corrosive coating layer 400 is formed in the anti-corrosive coating step S4 by using the recoiler 5. As shown in FIG. 12, the rust treated steel sheet 100 that has passed through the rust preventive coating unit 4 is finally wound by the recoiler 5.

Although not shown, the method for manufacturing a rust-treated steel sheet according to another embodiment of the present invention is formed between the rust-preventing coating step (S4) and the recoiling step (S5) in the rust-preventing coating layer (S4) is formed It further comprises an oil treatment step of forming an anti-rust oil layer by applying the anti-rust oil to the steel sheet (100). The only difference is that the rust preventive oil is applied instead of the synthetic resin, and the oil treatment step corresponds to the resin coating step (S41).

Hereinafter, the present invention will be described in more detail with reference to Examples. However, these are only for explaining the present invention in more detail, the scope of the present invention is not limited thereto.

≪ Example 1 >

1) The hot rolled steel sheet (width 10x10 = 100cm <2>, thickness 2mm) was immersed in hydrochloric acid (concentration 16%, temperature 80 degreeC), and the scale was removed completely.

2) The descaled steel sheet was washed with water.

3) The zirconium ion solution was spray-coated on the washed steel sheet.

4) The steel plate coated with the zirconium ion solution was washed with water.

5) An ethanolamine was sprayed onto the washed steel sheet.

6) Finally, the steel sheet was dried.

<Example 2>

1) The hot rolled steel sheet (width 15 × 7 = 105cm2, thickness 2mm) is immersed in hydrochloric acid (concentration 16%, temperature 80 ℃) to completely remove scale, spray water on the steel plate to wash out residual hydrochloric acid, Dried.

2) A polyethylene solution (containing 0.1 g of polyethylene) was applied to the upper surface of the steel sheet.

3) The steel sheet coated with polyethylene solution was hot-air dried at 180 ° C. for 30 seconds.

4) The hot-air dried steel sheet was cooled with cooling water (temperature 18 ° C.) and dried.

<Example 3>

1) The hot rolled steel sheet (width 15 × 7 = 105cm2, thickness 2mm) is immersed in hydrochloric acid (concentration 16%, temperature 80 ℃) to completely remove scale, spray water on the steel plate to wash out residual hydrochloric acid, Dried.

2) A polypropylene solution (containing 0.1 g of polyflofilene) was applied to the upper surface of the steel sheet.

3) The steel sheet coated with the polypropylene solution was hot-air dried at 180 ° C. for 30 seconds.

4) The hot-air dried steel sheet was cooled with cooling water (temperature 18 ° C.) and dried.

<Example 4>

Antirust oil was applied to the upper surface of the steel sheet prepared in Example 2.

&Lt; Comparative Example 1 &

1) The hot rolled steel sheet (width 10x10 = 100cm <2>, thickness 2mm) was immersed in hydrochloric acid (concentration 16%, temperature 80 degreeC), and the scale was removed completely.

2) After spraying and washing the steel sheet is removed scale and dried.

Comparative Example 2

1) The hot rolled steel sheet (width 15 × 7 = 105cm2, thickness 2mm) is immersed in hydrochloric acid (concentration 16%, temperature 80 ℃) to completely remove scale, spray water on the steel plate to wash out residual hydrochloric acid, Dried.

&Lt; Comparative Example 3 &

1) The hot rolled steel sheet (width 15 × 7 = 105cm2, thickness 2mm) is immersed in hydrochloric acid (concentration 16%, temperature 80 ℃) to completely remove scale, spray water on the steel plate to wash out residual hydrochloric acid, Dried.

2) The same amount of antirust oil as in Example 4 was applied to the upper surface of the steel sheet.

Experimental Example 1 Contrast of Anti-rust Effect According to Anti-rust Solution Cleaning

Test purpose: Identification of antirust effect according to the use of zirconium ion solution and ethanolamine

Test Method: The steel sheet prepared by Example 1 and Comparative 1 was exposed to the atmosphere for one day.

-Confirmation of results: FIG. 13 is a photograph taken after exposing the steel sheets prepared by Example 1 and Comparative Example 1 in the air for one day, but the scales were not formed on the steel sheets prepared by Example 1, It can be seen that the scale is formed on the steel sheet produced by the same. Therefore, it can be seen that the antirust efficiency of the steel sheet can be improved when the antirust film is formed using the zirconium ion solution and the ethanolamine after removing the scale using hydrochloric acid.

Experimental Example 2 Contrast of Antirust Effect According to Synthetic Resin Coating

-Test purpose: Confirmation of antirust effect according to the use of synthetic resin and the type of synthetic resin used

-Test method: The steel sheets prepared by Examples 2 to 4 and Comparative Examples 2 to 3 were dipped in brine (concentration 5%) for one day, and then taken out and dried.

-Confirmation of results: FIG. 14 is a photograph taken after drying the steel sheet prepared according to Examples 2 to 4 and Comparative Examples 2 to 3 from salt water. The steel sheets prepared by Examples 2 and 3 had a smaller scale than those of the steel sheets 100 prepared by Comparative Examples 2 to 3, through which the anti-rust effect of the steel sheet coated with polyethylene and polypropylene resin was oil-treated. It can be seen that better. In addition, it can be seen that the steel sheet produced by Example 2 is less scaled than the steel sheet prepared by Example 3, but it can be seen that the polyethylene resin has an excellent anti-rust effect compared to polypropylene. In addition, the steel sheet produced in Example 4 was hardly rusted through this it can be seen that when the polyethylene resin coated and coated with rust preventive oil has a significantly improved anti-rust effect not to corrode even salt water.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Should be interpreted as falling within the scope of.

1: Uncoiler 2: Steel plate feeder 3: Scale remover 4: Antirust coating
5: Recoiler 6: Control part 21: Shaft 22: Roller
31: acid treatment unit 32: antirust solution treatment unit 33: drying unit 41: coating means
42: aftertreatment means 311: acid solution tank 312: control pump 313: acid solution container
314: temperature control means 315: collecting means 316: recovery tank 321: antirust solution tank
322: control pump 323: solution injection unit 331: air supply unit 332: control valve
333: air injection unit 411: resin container 412: transfer roller 413: coating roller
421: heat treatment part 422: cooling part 423: drying part 4211: air supply part
4212: control valve 4213: air injection unit 4221: water tank 4222: cooler
4223 control pump 4224 water injection unit 4231 air supply 4232 control valve
4233: air jet
100: steel sheet 200: scale 300: rustproof film 400: rustproof coating layer

Claims (12)

A steel sheet from which the scale is removed, an rustproof film formed on an outer surface of the steel sheet, and an rustproof coating layer formed on an outer surface of the rustproof film,
The rustproof film includes a first rustproof film formed by coating a zirconium ion solution on the outer surface of the steel plate, and a second rustproof film formed by applying ethanolamine on the outer surface of the first rustproof film,
The anti-corrosive coating layer is formed by applying a synthetic resin solution, the synthetic resin is a rust-treated steel sheet, characterized in that the polyethylene resin or polypropylene resin is used. delete delete delete In the method of manufacturing a rust-treated steel sheet using a rust-preventing device,
The manufacturing method of the steel sheet includes a descaling step of removing the scale from the steel sheet, and an anti-corrosion coating step of forming a rustproof coating layer having a predetermined thickness by coating a synthetic resin on the descaled steel sheet through the descaling step,
The descaling step includes an acid treatment step of immersing the steel plate in an acidic solution to dissolve the scale, and an anti-rust solution treatment step of forming a first rust-preventing film by applying a zirconium ion solution to the descaled steel plate through the acid treatment step. And a second rust preventive solution treatment step of forming a second rust preventive film by applying ethanolamine to the steel sheet on which the first rust preventive film is formed through the rust prevention solution treatment step.
The anti-corrosive coating step is a resin coating step of applying a synthetic resin solution to the steel sheet on which the scale is removed through the descaling step and the first and second anti-corrosion membranes, and heat treatment and cooling the steel plate coated with the synthetic resin solution through the resin coating step And a post-treatment step of forming an anti-corrosion coating layer on the outer surface of the second anti-corrosion film,
The synthetic resin is a method of producing a rust-treated steel sheet, characterized in that consisting of polyethylene resin or polypropylene resin. delete delete delete delete The method of claim 5,
The acidic solution has a temperature of 70 to 90 ℃,
In the post-treatment step, the heat treatment is performed by spraying the heated air having a temperature of 160 to 200 ℃ to the steel sheet,
In the post-treatment step, the cooling is performed by spraying a cooling water having a temperature of 16 to 20 ℃ to the steel sheet. The method of claim 5, wherein
The method of manufacturing a rust-treated steel sheet characterized in that it further comprises an oil treatment step of forming an rust-proof oil layer by coating the rust-proof oil on the outer surface of the anti-rust coating layer formed through the anti-rust coating step. The method of claim 5, wherein the antirust treatment device
A steel plate conveying unit for transferring the steel sheet; A scale removing unit for removing scales from the steel sheet transferred by the steel plate transferring unit; It includes; Anti-corrosion coating portion for forming a rust-proof coating layer by coating the steel sheet is removed by the scale removing unit with a synthetic resin,
The descaling unit is an acid treatment unit for immersing the steel sheet transferred by the steel plate transfer unit in an acidic solution to dissolve and remove the scale, and applying a zirconium ion solution to the steel plate descaled by the acid treatment unit to form a first rustproof film. And a second anti-corrosive solution treatment unit for applying an ethanolamine to the steel plate on which the first anti-corrosive film is formed to form a second anti-corrosive film,
The anti-corrosive coating unit is a coating means for applying a synthetic resin solution to the steel sheet descaled by the descaling unit, and a post-treatment means for heat-treating and cooling the steel plate coated with the synthetic resin solution by the coating means to form an anti-corrosive coating layer Include,
The acid treatment unit includes an acid solution container containing an acid solution, temperature control means connected to the acid solution container to control a temperature of the acid solution contained in the acid solution container, and positioned above the acid solution container. Method for producing a rust-treated steel sheet comprising a collecting means for collecting the evaporated acidic solution generated in the process of removing the scale.

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