A hot rolling system and method for in-situ forming a corrosion and wear resistant ceramic layer on a steel plate surface

Abstract

The present application relates to a kind of steel plate surface corrosion-resistant wear-resistant ceramic layer in-situ film forming hot rolling system and method, including hot rolling unit and coating unit, upper roller and lower roller of hot rolling mill are connected with coating unit, and coating unit includes roll-to-roll conveying system, drying unit, coating doctor system, supply unit and heating unit.Ceramic slurry is evenly and smoothly coated on non-woven fabric by supply unit and coating doctor system, then preheated by drying unit and heating unit, paste on the surface of upper roller or lower roller of hot rolling mill, realize continuous conveying by roll-to-roll conveying system, finally act on the interface of roller and steel plate, and non-woven fabric containing ceramic composite powder is carbonized and element diffusion by high temperature and high pressure, realize interface metallurgical bonding, form a dense ceramic layer.The hot rolling system of the present application can realize in-situ ceramic film forming on the surface of steel plate, enhance the corrosion and wear resistance of steel plate, and improve the outstanding contradiction between the preparation cost, efficiency and coating performance of ceramic coating.

Description

Technical Field

[0001] This invention relates to the field of metal material forming technology, specifically to a hot rolling system and method for in-situ film formation of corrosion-resistant and wear-resistant ceramic layers on the surface of steel plates. Background Technology

[0002] This statement provides only background information related to the present invention and does not necessarily constitute prior art.

[0003] With the rapid development of modern industrial technology, the service environment of hot-rolled steel plates is becoming increasingly harsh. Corrosive media in the working environment and high-frequency, high-load contact friction can lead to surface corrosion and fatigue wear of the substrate products, resulting in reduced product service life and significant economic losses. In recent years, coating modified coatings on steel plates has been considered an effective means to enhance steel plate performance and improve corrosion and wear resistance. Studies have shown that ceramic materials have good high-temperature oxidation resistance, salt spray corrosion resistance, and wear resistance. Therefore, composite materials formed by covering metal surfaces with ceramic coatings possess both the strength and toughness of metals and the advantages of ceramic materials such as high-temperature resistance, high-temperature oxidation resistance, wear resistance, and corrosion resistance. In recent years, the method of improving the mechanical properties of steel plates by coating with functional ceramic coatings has received increasing attention and has become a research hotspot in the field of metal material forming technology.

[0004] Currently, commonly used methods for preparing ceramic coatings on steel plate surfaces include vapor deposition, thermal spraying, laser cladding, and slurry methods. However, these methods require surface pretreatment and present a significant contradiction between preparation cost, efficiency, and coating performance. For example, patent CN215473589U discloses an oil-based heavy-duty anti-corrosion and wear-resistant composite coating. Although it enhances the corrosion and wear resistance of the steel plate substrate, the substrate requires pretreatment, namely, electroplating a zinc layer, which is cumbersome and costly. Patent CN115958191A discloses a method for preparing a composite anti-corrosion layer, in which a metal composition is applied to the surface of a steel substrate using a cold spraying process. While this enhances the substrate's anti-corrosion performance, surface roughening treatment is required during cold spraying, and the coating has high porosity after formation, necessitating further sealing treatment, which increases manufacturing costs. In addition, the low bonding strength between the coating and the substrate results in relatively poor service performance.

[0005] Patent CN112877582A discloses a production system and process for metal-based composite ceramic steel plates. A uniform feeder disperses preheated ceramic particles onto the surface of molten steel, and the flowing molten steel and ceramic particles are then fed together into a horizontal continuous casting machine to cast a metal-based composite ceramic steel plate with high hardness and strong wear resistance. However, the cast metal-based composite ceramic steel plate has relatively low strength and lacks good mechanical properties, resulting in poor performance under extreme working conditions. Therefore, further processing such as forging or rolling is required to improve the strength and mechanical properties of the metal-based composite ceramic steel plate. However, the different coefficients of thermal expansion of ceramic particles and molten steel, and the poor toughness of the ceramic particle layer formed by the mechanical bonding between the molten steel and the ceramic particle layer during casting, lead to cracking and detachment of the ceramic particle layer on the steel surface due to mechanical stress during forging or rolling. This reduces the wear and corrosion resistance of the prepared metal-based composite ceramic steel plate, and may even cause it to fail. Furthermore, the forming process described in the patent is somewhat cumbersome, increasing manufacturing costs to some extent. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a hot rolling system and method for in-situ film formation of corrosion-resistant and wear-resistant ceramic layers on steel plate surfaces, thereby resolving the problem of surface pretreatment required before preparing ceramic coatings on hot-rolled steel plates and addressing the prominent contradiction between improving the cost, efficiency, and performance of ceramic coating preparation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] In a first aspect, the present invention provides a hot rolling system for in-situ film formation of a corrosion-resistant and wear-resistant ceramic layer on the surface of a steel plate, comprising a hot rolling unit and a multifunctional coating unit; the hot rolling unit comprises two rollers rotating in opposite directions, the steel plate passing between the two rollers, and the rollers being able to drive a non-woven fabric coated with ceramic slurry to be rolled onto the surface of the steel plate.

[0009] The multifunctional coating unit includes a roll-to-roll conveying system, a heating and drying unit, a coating doctor blade system, a ceramic slurry supply unit, and a heating unit. The roll-to-roll conveying system is used to transport the raw nonwoven fabric. The heating and drying unit is located below the raw nonwoven fabric, and the coating doctor blade system and the ceramic slurry supply unit are located above the raw nonwoven fabric. The heating unit is located between the roll-to-roll conveying system and the hot rolling unit. The ceramic slurry supply unit is used to provide ceramic slurry, which is connected to the coating doctor blade system through a slurry supply pipe. The coating doctor blade system evenly coats the slurry onto the raw nonwoven fabric. The heating unit is used to cover the nonwoven fabric with ceramic slurry, making it viscoelastic and then quickly adhering it to the rollers.

[0010] The steel plate hot rolling in-situ ceramic layer film formation system proposed in this invention utilizes the high temperature and high pressure generated by hot rolling to achieve an in-situ metallurgical reaction between carbon steel and alloy steel and ceramic composite powder during the hot rolling deformation process, forming a ceramic modified layer on the surface, thereby enhancing the corrosion resistance and wear resistance of hot-rolled steel plates and improving their service performance and lifespan.

[0011] As a further technical solution, the roll-to-roll conveying system includes a roll roller wound with raw nonwoven fabric and a guide roller, the roll roller and the guide roller being set at a certain distance apart, the raw nonwoven fabric on the roll roller being guided by the guide roller and moving forward; a heating and drying unit is set between the roll roller and the guide roller.

[0012] As a further technical solution, the width of the nonwoven fabric should be greater than or equal to the width of the rolled steel plate.

[0013] As a further technical solution, the heating and drying unit is a heating and drying vacuum plate, and several micropores are provided on the surface of the heating and drying vacuum plate for adsorbing non-woven fabric.

[0014] Secondly, the present invention also proposes a method for in-situ hot rolling of a corrosion-resistant and wear-resistant ceramic layer on a steel plate surface using the aforementioned hot rolling system, comprising the following steps:

[0015] S1. Prepare ceramic slurry and put the prepared slurry into the feeding unit;

[0016] S2. Prepare nonwoven fabric with ceramic modification, set the roll-to-roll system winding speed, turn on the roll-to-roll system to transport the nonwoven fabric, and transport the ceramic slurry prepared in step 1 onto the nonwoven fabric through the feeding unit. Then, the slurry is evenly coated onto the nonwoven fabric through the coating doctor blade system. Adjust the roll-to-roll system winding speed and the temperature of the heating and drying unit. The nonwoven fabric coated with slurry passes through the heating and drying unit. After the slurry on the nonwoven fabric is dried, determine the temperature of the heating and drying vacuum plate.

[0017] S3. Pre-treat the surface of the steel plate before hot rolling;

[0018] S4. Set the heating unit parameters to ensure that the nonwoven fabric has viscoelasticity after passing through the heating unit and can adhere to the hot rolling mill rolls; set the hot rolling unit curling parameters to ensure that the nonwoven fabric can be accurately and uniformly spread onto the steel plate during the rolling process.

[0019] S5. Set rolling parameters: Set the initial rolling temperature for the steel plate to be modified to ensure that the steel plate temperature can melt the nonwoven fabric with modification function during rolling; set the rolling rate parameter to ensure that the nonwoven fabric forms a uniform film during the rolling process; set the reduction parameter to ensure that the pressure introduced during the rolling process can reduce or even eliminate the thermal stress generated between the coating and the substrate, and prevent the generation of microcracks and pores.

[0020] S6. Start the hot rolling unit and activate the multi-functional coating unit. Utilize the high temperature and high pressure of the hot rolling process to hot roll the steel plate covered with non-woven fabric, promoting the rapid formation of the ceramic layer on the surface of the steel plate, and ultimately achieving in-situ enhancement of the corrosion and wear resistance of the hot-rolled steel plate.

[0021] As a further technical solution, the ceramic composite powder raw material in S1, by mass parts, contains 30-55 parts SiO2, 15-30 parts B2O3, 5-15 parts Al2O3, 10-20 parts Na2O, 0-10 parts K2O, 0-10 parts ZnO, 0-5 parts CaO, and 0-15 parts MgO.

[0022] As a further technical solution, the specific process of S1 is as follows: weigh the ceramic composite powder raw material, prepare the mixed ceramic modified powder, add it to pure water at a mass ratio of 10-40%, stir it with an ultrasonic probe, disperse the powder in pure water, and obtain a stable and uniformly dispersed slurry.

[0023] As a further technical solution, the nonwoven fabric is a hydrophilic nonwoven fabric, meltblown nonwoven fabric, heat-sealed nonwoven fabric, and spunbond nonwoven fabric.

[0024] As a further technical solution, in S4, the heating unit parameters are 80~120℃; the curling unit parameters are 0.1~1.5m / min.

[0025] As a further technical solution, in S5, the rolling parameters are: initial rolling temperature of 900-1200℃, rolling speed of 0.1-1m / min, and reduction of 5-20% of the plate thickness before rolling.

[0026] The beneficial effects of this invention are as follows:

[0027] Compared with existing hot rolling technology, the ceramic layer in-situ film-forming hot rolling system and method of this invention can realize in-situ film formation of ceramic layer on steel plate surface, thus effectively avoiding subsequent surface modification treatment, reducing production costs. Moreover, the high temperature and high pressure of hot rolling itself can promote element diffusion between ceramic powder and steel plate, realize metallurgical bonding, and thus enhance the interfacial bonding strength between modified layer and substrate, improve the corrosion resistance and wear resistance of hot-rolled steel plate, and improve the prominent contradiction between ceramic coating preparation cost, efficiency and coating performance. In particular, the ceramic powder carrier nonwoven fabric is heated and carbonized during hot rolling to form a carbon layer, which helps to reduce hot rolling force and reduce mill energy consumption. Attached Figure Description

[0028] The accompanying drawings, which constitute a part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and related descriptions of the invention are used to explain the invention and do not constitute an improper limitation of the invention.

[0029] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0030] Figure 2 and Figure 3 This is a diagram showing the coating and hot rolling states of the hot-rolled multifunctional coating unit in an embodiment of the present invention.

[0031] Among them, 1-hot rolling unit, 2-multi-functional coating unit, 3-roll-to-roll conveying system, 3-1 roll roll, 3-2 guide roll, 4-heating and drying vacuum plate, 5-coating doctor blade system, 6-ceramic slurry feeding unit, 7-heating unit, 8-original nonwoven fabric, 9-ceramic slurry nonwoven fabric, 10-steel plate, 11-hot rolled steel plate, 12-roll. Detailed Implementation

[0032] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] As described in the background section, existing methods for preparing ceramic coatings on steel plate surfaces include vapor deposition, thermal spraying, laser cladding, and slurry methods. However, these methods require surface pretreatment and present a significant contradiction between preparation cost, efficiency, and coating performance. To address this issue, this invention proposes a hot rolling system and method for in-situ film formation of corrosion-resistant and wear-resistant ceramic layers on steel plate surfaces. The high temperature and pressure of hot rolling promote elemental diffusion between the ceramic powder and the steel plate, achieving metallurgical bonding. This enhances the interfacial bonding strength between the modified layer and the substrate, improving the corrosion and wear resistance of the hot-rolled steel plate and resolving the prominent contradiction between ceramic coating preparation cost, efficiency, and coating performance. Specifically, the nonwoven fabric carrying the ceramic powder undergoes carbonization during hot rolling, forming a carbon layer. This reduces hot rolling force and mill energy consumption, effectively avoiding subsequent surface modification treatment and lowering production costs.

[0035] This embodiment provides a hot rolling system for in-situ film formation of a corrosion-resistant and wear-resistant ceramic layer on a steel plate surface, including a hot rolling mill and a multi-functional coating unit. The hot rolling unit includes two counter-rotating rollers, through which the steel plate passes. The rollers can roll a non-woven fabric coated with ceramic slurry onto the steel plate surface. The multi-functional coating unit includes a roll-to-roll conveying system, a heating and drying unit, a coating doctor blade system, a ceramic slurry supply unit, and a heating unit. The roll-to-roll conveying system is used to transport the raw non-woven fabric. The heating and drying unit is located below the raw non-woven fabric, and the coating doctor blade system and the ceramic slurry supply unit are located above the raw non-woven fabric. A heating unit is located between the roll-to-roll conveying system and the hot rolling unit. The ceramic slurry supply unit is used to provide ceramic slurry, which is connected to the coating doctor blade system through a supply pipe. The coating doctor blade system uniformly coats the slurry onto the raw non-woven fabric. The heating unit is used to cover the non-woven fabric with ceramic slurry, making it viscoelastic and then quickly adhering it to the rollers.

[0036] The in-situ ceramic layer film formation system for hot-rolled steel plates proposed in this embodiment utilizes the high temperature and high pressure generated by hot rolling to achieve an in-situ metallurgical reaction between carbon steel and alloy steel and ceramic composite powder during the hot rolling deformation process, forming a ceramic modified layer on the surface, thereby enhancing the corrosion resistance and wear resistance of hot-rolled steel plates and improving their service performance and lifespan.

[0037] like Figure 1 The hot rolling system for in-situ film formation of corrosion-resistant and wear-resistant ceramic layer on steel plate surface proposed in this embodiment includes a hot rolling mill 1 and a multi-functional coating unit 2, as detailed below:

[0038] The hot rolling mill 1 adopts an existing two-roll hot rolling mill, which includes two opposing rotating rolls 12, through which the steel plate passes; the rolls 12 can drive a non-woven fabric coated with ceramic slurry to be rolled onto the surface of the steel plate.

[0039] The multi-functional coating unit 2 includes a roll-to-roll conveying system 3, a heating and drying vacuum plate 4, a coating doctor blade system 5, a ceramic slurry feeding unit 6, and a heating unit 7;

[0040] The roll-to-roll conveying system 3 includes a roll 3-1 wound with raw nonwoven fabric 8 and a guide roller 3-2. The roll 3-1 and the guide roller 3-2 are set at a certain distance apart. The raw nonwoven fabric 8 on the roll 3-1 is guided by the guide roller and moves forward. The roll conveys the raw nonwoven fabric. The guide roller 3-2 can convey nonwoven fabric containing ceramic modified powder.

[0041] Between the roll roller and the guide roller is a heating and drying vacuum plate 4, which is located below the stretched original nonwoven fabric 8 and is used to dry and absorb the coating slurry of the nonwoven fabric.

[0042] A coating doctor blade system 5 and a ceramic slurry feeding unit 6 are set above the original nonwoven fabric 8; a heating unit 7 is set between the guide roller and the hot rolling mill 1; the ceramic slurry feeding unit 6 is mainly used to provide a certain amount of ceramic slurry, which is connected to the coating doctor blade system 5 through a slurry supply pipe. The coating doctor blade system 5 transports the slurry to the upper surface of the original nonwoven fabric 8 and coats the slurry evenly and flatly onto the nonwoven fabric to prepare a ceramic-modified nonwoven fabric.

[0043] The heating unit 7 is used to preheat the ceramic-modified nonwoven fabric to a viscoelastic state, so that it can be quickly and effectively bonded to the hot rolling mill rolls during the hot rolling process. The preheating temperature of the heating unit 7 is 80-120℃.

[0044] The in-situ ceramic layer film-forming system for hot-rolled steel plates proposed in this invention utilizes the high temperature and pressure generated during hot rolling to achieve an in-situ metallurgical reaction between carbon steel and alloy steel and ceramic composite powder during the hot rolling deformation process. This results in the formation of a ceramic modified layer on the surface, thereby enhancing the corrosion and wear resistance of the hot-rolled steel plate and improving its service performance and lifespan. The nonwoven fabric with the modified function carbonizes at high temperatures, undergoing chemical reactions and element diffusion with the molten slurry and steel plate; the carbonization temperature of the nonwoven fabric is 200–400℃.

[0045] As a further technical solution, the width of the nonwoven fabric in this embodiment should be greater than or equal to the width of the rolled steel plate to ensure that the nonwoven fabric can completely cover the surface of the steel plate.

[0046] As a further technical solution, the surface of the heating and drying vacuum plate 4 in this embodiment has 3 micropores with a diameter of 3mm per square centimeter. The main function of the micropores is to adsorb nonwoven fabric to a certain extent, so as to assist the coating doctor blade system in completing the coating.

[0047] As a further technical solution, the diameter of the dual rollers in the roll-to-roll conveying system can be 150mm.

[0048] As a further technical solution, the thickness of the doctor blade in the coating doctor blade system is 10-15 mm.

[0049] The processing method corresponding to the hot rolling system for in-situ ceramic film formation on the surface of the aforementioned steel plate includes the following steps:

[0050] Step 1: Ceramic modified powder is prepared through processes such as ball milling, sintering and screening. The ceramic modified powder is added to water at a certain percentage to prepare a ceramic slurry with good wettability to the surface of the steel plate to be rolled. Preferably, the slurry concentration is 0.2-0.5 g / ml.

[0051] The ceramic composite powder raw materials mentioned in S1, by mass parts, contain: 30-55 parts SiO2, 15-30 parts B2O3, 5-15 parts Al2O3, 10-20 parts Na2O, 0-10 parts K2O, 0-10 parts ZnO, 0-5 parts CaO, and 0-15 parts MgO.

[0052] Step 2: Prepare ceramic-modified nonwoven fabric. Set the roll-to-roll system winding speed, turn on the roll-to-roll system for nonwoven fabric conveying and winding, and convey the ceramic slurry prepared in Step 1 through the feeding unit to ensure that the slurry can be uniformly coated on the nonwoven fabric after being scraped by the coating doctor blade system. The preferred winding speed is 0.1-1.5 m / min. Adjust the temperature of the heating and drying vacuum plate by adjusting the winding speed of the roll-to-roll system. After the nonwoven fabric coated with slurry is dried by the heating and drying vacuum plate, determine the temperature of the heating and drying vacuum plate. The preferred temperature of the heating and drying vacuum plate is 80-120℃.

[0053] Step 3: Perform surface pretreatment on the steel plate to be rolled to remove stains from the workpiece surface and obtain the steel plate surface in the actual hot rolling production process. Preferably, the steel plate is polished and then placed in tap water for ultrasonic cleaning for a set time of 5 to 15 minutes, preferably 10 minutes, to remove stains from the surface of the workpiece to be processed.

[0054] Step 4: Set the parameters of the multi-functional coating unit, turn on the multi-functional coating unit, set the parameters of the heating unit to ensure that the non-woven fabric has viscoelasticity after passing through the heating unit and can quickly and effectively adhere to the hot rolling mill rolls; set the curling parameters to ensure that the non-woven fabric can be accurately and uniformly spread on the steel plate during the rolling process.

[0055] Step 5: Set the hot rolling parameters, start the hot rolling mill, and set the initial rolling temperature to ensure that the surface temperature of the steel plate during rolling can melt the nonwoven fabric with the modified function at a high temperature, and then allow element diffusion with the steel plate; set the rolling rate parameters to ensure that the nonwoven fabric forms a uniform film during the rolling process; set the reduction parameters to ensure that the pressure introduced during the rolling process can reduce or even eliminate the thermal stress generated between the coating and the substrate, and prevent the generation of microcracks and pores.

[0056] Step 6: After all processing parameters are adjusted, start the hot rolling mill and turn on the multi-functional coating unit. Use the high temperature and high pressure of the hot rolling process to hot roll the steel plate covered with non-woven fabric, promote the rapid film formation of the ceramic layer on the surface of the steel plate, and finally realize the in-situ enhancement of the corrosion and wear resistance of the hot-rolled steel plate.

[0057] Example 1

[0058] Based on the above system, this embodiment provides a method for coating ceramic composite powder slurry with heat-sealed nonwoven fabric and hot-rolled in-situ ceramicized reinforced low-alloy steel, specifically including the following steps:

[0059] S1: The following ceramic powders were uniformly mixed using processes such as ball milling, high-temperature sintering, and sieving: 35% SiO2, 20% B2O3, 5% Al2O3, 8% Na2O, 7% K2O, 10% ZnO, 5% CaO, and 10% MgO to prepare a ceramic modified powder. The ceramic modified powder was then mechanically stirred and dispersed in pure water to prepare a uniformly mixed ceramic slurry with a concentration of 0.3 ± 0.02 g / ml.

[0060] S2: Start the multi-functional coating unit, transport the heat-sealed nonwoven fabric through the roll-to-roll conveyor system, and coat the ceramic slurry prepared in S1 evenly onto the heat-sealed nonwoven fabric through the doctor blade system, and then dry it through the vacuum heating drying plate.

[0061] S3: Use 200-grit sandpaper to grind a low-alloy steel plate with a length of 120mm, a width of 50mm, and a thickness of 5mm. Then, put it into pure water for ultrasonic cleaning for 10 minutes to obtain a steel plate surface that simulates the actual hot rolling process.

[0062] S4: Set the parameters of the multi-functional coating unit: roll-to-roll system winding rate 0.5m / min, heating and drying vacuum plate temperature 80℃, doctor blade scraping thickness 1mm, heating unit temperature 100℃.

[0063] S5: Set the hot rolling mill parameters, set the rolling speed to 0.5m / min, the reduction to 5%, the steel plate heating temperature to 1000℃, and the holding time to 30min. Then, attach the non-woven fabric that has passed through the heating unit to the upper roll, and then start the hot rolling mill to hot roll the low alloy steel to form a ceramic layer in situ.

[0064] S6: After processing is completed, shut down the multi-functional coating unit and the hot rolling mill.

[0065] Example 2

[0066] Based on the above system, this embodiment provides a method for coating meltblown nonwoven fabric with hot-rolled in-situ ceramicized reinforced low-alloy steel using ceramic composite powder slurry, specifically including the following steps:

[0067] S1: The following ceramic powders were uniformly mixed using processes such as ball milling, high-temperature sintering, and sieving: 30% SiO2, 18% B2O3, 5% Al2O3, 7% Na2O, 7% K2O, 8% ZnO, 10% CaO, and 15% MgO to prepare ceramic modified powder. The ceramic modified powder was then mechanically stirred and dispersed in pure water to prepare a uniformly mixed slurry with a concentration of 0.25 ± 0.02 g / ml.

[0068] S2: Start the multi-functional coating unit, transport the meltblown nonwoven fabric through the roll-to-roll conveyor system, and coat the meltblown nonwoven fabric evenly with the slurry through the doctor blade system. Then, dry it through the vacuum heating drying plate.

[0069] S3: Use 200-grit silicon carbide sandpaper to polish an alloy steel plate paper with a length of 120mm, a width of 50mm, and a thickness of 5mm. Then, put it into pure water for ultrasonic cleaning for 10 minutes to obtain a steel plate surface that simulates the actual hot rolling process.

[0070] S4: Set the parameters of the multi-functional coating unit: roll-to-roll system winding rate 0.4m / min, heating and drying vacuum plate temperature 100℃, doctor blade scraping thickness 1mm, heating unit temperature 120℃.

[0071] S5: Set the hot rolling mill parameters, set the rolling speed to 0.4m / min, the reduction to 10%, the steel plate heating temperature to 900℃, and the holding time to 30min. Adhere the non-woven fabric that has passed through the heating unit to the lower roll, start the hot rolling mill, and hot roll the low alloy steel to form a ceramic layer in situ.

[0072] S6: After processing is completed, shut down the multi-functional coating unit and the hot rolling mill.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hot rolling system for in-situ film formation of a corrosion-resistant and wear-resistant ceramic layer on a steel plate surface, comprising a hot rolling unit and a multifunctional coating unit; the hot rolling unit includes two counter-rotating rolls, the steel plate passes between the two rolls, and the rolls can drive a non-woven fabric coated with ceramic slurry to be rolled onto the surface of the steel plate; characterized in that, The multifunctional coating unit includes a roll-to-roll conveying system, a heating and drying unit, a coating doctor blade system, a ceramic slurry supply unit, and a heating unit. The roll-to-roll conveying system is used to transport the raw nonwoven fabric. The heating and drying unit is located below the raw nonwoven fabric, and the coating doctor blade system and the ceramic slurry supply unit are located above the raw nonwoven fabric. The heating unit is located between the roll-to-roll conveying system and the hot rolling unit. The ceramic slurry supply unit is used to provide ceramic slurry, which is connected to the coating doctor blade system through a slurry supply pipe. The coating doctor blade system uniformly coats the ceramic slurry onto the raw nonwoven fabric. The heating unit is used to cover the nonwoven fabric with ceramic slurry, making it viscoelastic and then quickly adhering it to the rollers.

2. The hot rolling system for in-situ film formation of corrosion-resistant and wear-resistant ceramic layer on steel plate surface as described in claim 1, characterized in that, The roll-to-roll conveying system includes a roll roller wound with raw nonwoven fabric and a guide roller, which are set at a certain distance apart. The raw nonwoven fabric on the roll roller is guided by the guide roller and moves forward. A heating and drying unit is set between the roll roller and the guide roller.

3. The hot rolling system for in-situ film formation of corrosion-resistant and wear-resistant ceramic layer on steel plate surface as described in claim 1, characterized in that, The width of the nonwoven fabric should be greater than or equal to the width of the steel plate.

4. The hot rolling system for in-situ film formation of corrosion-resistant and wear-resistant ceramic layer on steel plate surface as described in claim 1, characterized in that, The heating and drying unit is a heating and drying vacuum plate, and several micropores are provided on the surface of the heating and drying vacuum plate for adsorbing non-woven fabric.

5. A method for in-situ hot rolling of a corrosion-resistant and wear-resistant ceramic layer on a steel plate surface using the hot rolling system for in-situ film formation of a corrosion-resistant and wear-resistant ceramic layer on the steel plate surface according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Prepare ceramic slurry and put the prepared ceramic slurry into the ceramic slurry feeding unit; S2. Prepare a nonwoven fabric with ceramic modification. Set the roll-to-roll conveyor system's winding speed and start the roll-to-roll conveyor system to transport the nonwoven fabric. The ceramic slurry prepared in step S1 is transported to the original nonwoven fabric through the ceramic slurry feeding unit. Then, the ceramic slurry is uniformly coated onto the original nonwoven fabric through the coating doctor blade system. Adjust the roll-to-roll conveyor system's winding speed and the heating and drying unit's temperature. The nonwoven fabric coated with ceramic slurry passes through the heating and drying unit. After the ceramic slurry on the nonwoven fabric is dried, determine the temperature of the heating and drying unit. S3. Pre-treat the surface of the steel plate before hot rolling; S4. Set the heating unit parameters to ensure that the nonwoven fabric has viscoelasticity after passing through the heating unit and can adhere to the rolls of the hot rolling unit; set the hot rolling unit curling parameters to ensure that the nonwoven fabric can be accurately and uniformly spread onto the steel plate during the rolling process; the hot rolling unit curling parameters are 0.1~1.5m / min. S5. Set rolling parameters: Set the initial rolling temperature for the steel plate to be modified to ensure that the steel plate temperature can melt the non-woven fabric with the modification function during rolling; Set the rolling rate parameters to ensure uniform film formation of the ceramic layer during the rolling process; Set the reduction parameters to ensure that the pressure introduced during the rolling process can reduce or even eliminate the thermal stress generated between the film and the steel plate, and prevent the formation of microcracks and pores. S6. Start the hot rolling unit and activate the multi-functional coating unit. Utilize the high temperature and high pressure of the hot rolling process to hot roll the steel plate covered with non-woven fabric, promoting the rapid formation of the ceramic layer on the surface of the steel plate, and ultimately achieving in-situ enhancement of the corrosion and wear resistance of the hot-rolled steel plate.

6. The hot rolling method for in-situ film formation of corrosion-resistant and wear-resistant ceramic layer on steel plate surface as described in claim 5, characterized in that: The specific process of S1 is as follows: Weigh the ceramic composite powder raw material, prepare the mixed ceramic modified powder, add it to pure water at a mass ratio of 10~40%, stir it with an ultrasonic probe, disperse the powder in pure water, and obtain a stable and uniformly dispersed ceramic slurry.

7. The hot rolling method for in-situ film formation of corrosion-resistant and wear-resistant ceramic layer on steel plate surface as described in claim 5, characterized in that: The nonwoven fabric is a hydrophilic nonwoven fabric, meltblown nonwoven fabric, heat-sealed nonwoven fabric, or spunbond nonwoven fabric.

8. The hot rolling method for in-situ film formation of corrosion-resistant and wear-resistant ceramic layer on steel plate surface as described in claim 5, characterized in that: In S4, the heating unit parameters are 80~120℃.

9. The hot rolling method for in-situ film formation of corrosion-resistant and wear-resistant ceramic layer on steel plate surface as described in claim 5, characterized in that: In S5, the rolling parameters are: initial rolling temperature 900~1200℃, rolling speed 0.1~1 m / min, and reduction amount accounting for 5~20% of the plate thickness before rolling.

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