CN109487268B - Method for preparing high-strength wear-resistant corrosion-resistant composite coating on surface of low-carbon steel - Google Patents
Method for preparing high-strength wear-resistant corrosion-resistant composite coating on surface of low-carbon steel Download PDFInfo
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Abstract
The invention discloses a method for preparing a high-strength wear-resistant corrosion-resistant composite coating on the surface of low-carbon steel. Firstly, treating the surface of low-carbon steel, and then adding a mixed coating consisting of rare earth, graphene and a Ni base on the surface of the low-carbon steel; then adding a porous ceramic block on the upper layer of the coating, and then adding a hard ceramic block; electrodes are added at two ends of the low-carbon steel, mixed heat treatment of induction cladding and electrode heating is carried out under the vacuum condition, then nitriding treatment is carried out under the vacuum condition, and finally the high-strength wear-resistant corrosion-resistant composite coating is prepared on the surface of the low-carbon steel. The invention not only improves the corrosion resistance of the low-carbon steel, but also prolongs the service life and the service environment of the low-carbon steel; and the physical properties such as the surface friction resistance, the hardness and the like of the low-carbon steel are improved, the occurrence of the stress corrosion phenomenon of the low-carbon steel is reduced, and the method has important significance for reducing the enterprise loss and saving the production cost.
Description
Technical Field
The invention relates to a method for preparing a high-strength wear-resistant corrosion-resistant composite coating on the surface of low-carbon steel, belonging to the technical field of low-carbon steel coating preparation.
Background
Corrosion, wear and tear of metals have been the most prominent three forms of failure of metallic materials, with economic losses due to corrosion accounting for about 4% of the total annual production worldwide each year. Therefore, how to improve the corrosion resistance and surface strength of metal materials has been the most focused research direction for researchers. The low-carbon steel is mainly used for manufacturing springs, wear-resistant parts and the like. The low-carbon steel has poor hot hardness, and when the working temperature of the cutter is more than 200 ℃, the hardness and the wear resistance of the cutter are reduced sharply; the hardenability is low, and the diameter of the complete hardenability during water quenching is only 15-18mm generally; the maximum diameter or thickness of the fully quenched steel is only about 6mm during oil quenching, and the steel is easy to deform and crack. Low carbon steel is also subject to severe strength and corrosion conditions in use. At present, the metal enhancement mode is mainly started from the aspects of the smelting technology, smelting components, use environment, metal surface modification and the like of the metal. The metal surface modification mainly comprises surface coating, surface spraying, surface cladding, surface seeping layer treatment and the like. However, with the development of industrial technology and the increasing severity of the use environment, a single coating technology has been unable to meet the requirements of actual production and life, and the problems of workpiece breakage and corrosion are easily caused by the defects of poor strength, easy oxidation and the like of the coating in the use process.
Nitriding can obviously improve the surface hardness, wear resistance, corrosion resistance and fatigue resistance of the workpiece, so the method has wide application in precision mechanical parts, engine crankshafts, grinding machine spindles, grinding tools and cutters. The vacuum high-temperature cladding and other surface modification technologies are different in that the vacuum high-temperature cladding and other surface modification technologies avoid contact with air, the defects of a cladding layer are increased due to oxidation of the cladding layer and a substrate caused by heating in the cladding process, meanwhile, the cladding layer obtained by high-temperature cladding is uniformly heated, the thickness difference of the cladding layer is small, the damage to the substrate is small, and the phenomenon of 'entrainment' is not easy to occur. The invention combines vacuum heating cladding and vacuum nitriding technology, and improves the corrosion resistance, surface strength and other properties of the low-carbon steel on the basis of one-step forming.
The prior art and literature search show that: chinese patent CN101775548A discloses a method for producing low nitriding amount high magnetic induction oriented silicon steel strip. The method comprises the steps of controlling chemical components in the continuous casting billet, heating the continuous casting billet to 1100-1200 ℃, hot rolling the continuous casting billet into a hot rolled steel strip with the thickness of 2.0-2.5mm, two-stage normalizing annealing, primary cold rolling into a cold rolled steel strip with the thickness of 0.23-0.30mm, continuous decarburization treatment, continuous nitriding treatment, secondary recrystallization annealing treatment, conventional cooling and the like. Wherein: in the continuous nitriding treatment process, controlling N in the cold-rolled steel strip to be 0.0095-0.0150 in percentage by weight; secondary recrystallization annealingIn the treatment process, N is controlled when the temperature is raised to 750-1100 DEG C2By volume of N2-H2And (3) 75-90% of the total volume of the atmosphere, and finally preparing the low-nitriding-amount high-magnetic-induction oriented silicon steel strip. Chinese patent CN104805435A discloses a method for preparing a metal protective coating on the inner wall surface of an inner hole part, which belongs to the technical field of surface engineering and is mainly applied to the protection treatment of the inner wall surface of a mechanical inner hole part. The preparation method of the coating comprises the steps of cleaning the inner wall surface of the part, presetting a powder/binder coating, drying, high-frequency induction heating cladding, cooling and the like, and the high-frequency induction cladding coating is prepared on the inner wall surface.
The above patent is a surface induction cladding process by a single nitriding process. Has certain improvement effect on the surface strength and the corrosion resistance of the treatment. However, the cladding layer and the infiltration layer still have the problem of poor strength and corrosion resistance, and particularly in the induction cladding treatment process, the cladding layer is easy to generate the phenomenon of 'sandwich' due to the characteristics of induction cladding, the reinforcing effect of the cladding layer is poor, and the service life of a steel part is shortened.
Disclosure of Invention
The invention aims to provide a method for preparing a high-strength wear-resistant corrosion-resistant composite coating on the surface of low-carbon steel, which has obvious improvement on the physical and chemical properties of low-carbon steel, such as friction resistance, corrosion resistance, surface hardness and the like. Meanwhile, the surface oxidation of the cladding layer is inhibited in the cladding process, and the cladding layer is formed uniformly.
The principle of the invention is as follows: (1) the rare earth and the graphene are added into the cladding layer, so that the graphene and the rare earth have obvious enhancement effects on the corrosion resistance and the surface strength of the cladding layer, the graphene has excellent strength, specific surface area and conductivity, and the rare earth has a certain catalytic action on nitrogen in the nitriding process, so that the nitriding effect is improved. (2) The invention adds porous ceramic on the upper layer of the cladding layer firstly and then adds hard ceramic, and mainly aims to prevent the cladding layer from sputtering due to heating in a vacuum environment to pollute a vacuum furnace and cause loss of the cladding layer simultaneously, secondly because the porous ceramic can be used for nitriding treatment, the porous ceramic is used for nitriding treatment, thirdly, certain pressure is applied to the cladding layer by using the hard ceramic, and certain improvement effect is realized on improving the uniformity of the cladding layer. (3) The purpose of adding the electrodes at the two ends of the low-carbon steel is to improve the heating uniformity, prevent the phenomenon of 'half-grown', improve the cladding efficiency and save the production time. (4) The invention adopts vacuum cladding and aims to prevent the oxidation of a cladding layer in the cladding process in the air environment, increase the defects of the cladding layer and reduce the service life of the cladding layer. The invention provides a method for preparing a high-strength wear-resistant corrosion-resistant composite coating on the surface of low-carbon steel, which comprises the steps of firstly treating the surface of the low-carbon steel, and then adding a mixed coating consisting of rare earth, graphene and a Ni base on the surface of the low-carbon steel to form a cladding layer; then adding porous ceramic and then adding hard ceramic on the upper layer of the cladding layer; electrodes are added at two ends of the low-carbon steel, mixed heat treatment of induction cladding and electrode heating is carried out under the vacuum condition, nitriding is carried out under the vacuum condition, and finally the high-strength wear-resistant corrosion-resistant composite coating is prepared on the surface of the low-carbon steel.
The specific experimental procedure is as follows:
the first step is as follows: cutting the low-carbon steel into metal blocks with the size of 100 multiplied by 10 multiplied by 3mm for carrying out the heavy-chain cultivation, and pretreating the surface of the low-carbon steel by corundum abrasive paper with the size of 300 and 1200 meshes until the surface of the low-carbon steel has no obvious rust;
the second step is that: ultrasonically cleaning the surface of the low-carbon steel by using 96-98% ethanol solution, and naturally airing in an air environment after cleaning;
the third step: mixing and ball-milling 0.10-0.25% of C, 15-18% of Cr, 3-4% of B, 0.2-0.3% of Si, 13-15% of Fe, 0.03-0.06% of graphene, 0.04-0.06% of cerium chloride and the balance of Ni self-fluxing powder in a dry ball-milling mode, wherein the ball-material ratio is 10:1, the diameters of steel balls are 3mm, 5mm and 7mm, the rotating speed is 100r/min-120r/min, and the ball-milling time is 1.5h-2 h;
the fourth step: mixing the components in a mass ratio of 1:3, taking the mixture of rosin and turpentine as a binder, uniformly coating the mixture and the powder obtained after the ball milling in the third step on the surface of the low-carbon steel, wherein the coating thickness is 2-2.5 mm;
the fifth step: placing the coated low-carbon steel in a forced air drying oven at 110-120 ℃ for heat preservation for 7-8 h to fully volatilize the binder;
and a sixth step: placing the porous ceramic with the thickness of 2mm-2.5mm and the area of 100mm multiplied by 10mm above the coating dried in the fifth step, wherein the pore diameter of the porous ceramic is 60-100 mu m;
the seventh step: placing a layer of hard ceramic with the thickness of 3mm-4mm above the porous ceramic, wherein the size of the hard ceramic is 100mm multiplied by 10 mm;
eighth step: placing the cladding system obtained in the seventh step into a vacuum heating furnace tube, adding electrodes at two ends of the low-carbon steel, adding wires at two ends of the low-carbon steel, leading out the low-carbon steel from two ends of the vacuum furnace, and connecting the lead-out wires into an external power supply; a heating system is formed by a vacuum heating furnace tube and an external electric heating system; comprises a power supply, a switch, a current regulator and a wire, wherein the power supply voltage is 2-36V, and the maximum output current is 120-180A;
the ninth step: vacuumizing a furnace tube of a vacuum heating furnace, wherein the vacuum degree is 50-80Pa, the temperature of the vacuum heating furnace is set to be 1100-1450 ℃, current is introduced, the output voltage is 14-26V, the heating time is 5-10 s, and the current is 90-160A;
the tenth step: after cladding, reducing the temperature of the vacuum furnace to 520-550 ℃, introducing pure ammonia gas into the heating furnace, wherein the flow rate of the ammonia gas is 90-100mL/min, and keeping the temperature for 5-6 h;
the eleventh step: and (3) closing ammonia gas after nitriding is finished, cooling the reaction system to room temperature to obtain a required sample, and polishing and flattening the uneven part of the cladding layer by using 300-sand 600-mesh sand paper.
In the invention, the combination process of the low-carbon steel and the cladding system comprises the following steps: the composite coating is arranged on the surface of the low-carbon steel, the low-carbon steel and the surface coating are simultaneously heated by a vacuum furnace and an external electric heating system under the vacuum condition, so that the surface coating is melted and is metallurgically bonded with a low-carbon steel substrate, the ceramic material above the coating is used for preventing the coating from sputtering in a vacuum tube after being melted and for achieving the purpose of vacuum nitriding, and the ceramic material is not used as an additive material of the coating.
The invention has the beneficial effects that:
(1) the invention not only improves the corrosion resistance of the low-carbon steel, but also prolongs the service life and the service environment of the low-carbon steel; and the physical properties such as the surface friction resistance, the hardness and the like of the low-carbon steel are improved, the occurrence of the stress corrosion phenomenon of the low-carbon steel is reduced, and the method has important significance for reducing the enterprise loss and saving the production cost.
(2) By controlling the heating temperature and the heating current of the vacuum furnace in the cladding process, the cladding layer is uniformly heated and has proper temperature, and the phenomena of overburning and half-cooked are avoided
(3) The porous ceramic used in the invention is of a communicated type, so that the nitriding treatment can be successfully carried out after ammonia gas is heated and decomposed, and the nitriding process can be promoted to occur;
(4) graphite alkene etc. cladding is on particles such as Ni powder, Fe powder through the ball-milling, guarantees that graphite alkene and tombarthite are even in the distribution of cladding layer, has avoided graphite alkene to appear agglomerating the phenomenon.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
the first step is as follows: cutting the low-carbon steel into metal blocks with the size of 100 multiplied by 10 multiplied by 3mm for carrying out high-speed thin-wall transformation, and pretreating the surface of the low-carbon steel by using corundum abrasive paper with the size of 1200 meshes until no obvious rust is formed on the surface of the low-carbon steel;
the second step is that: ultrasonically cleaning the surface of the low-carbon steel by using an ethanol solution with the concentration of 98%, and naturally airing in an air environment after cleaning;
the third step: mixing and ball-milling 0.16% of C, 15% of Cr, 3% of B, 0.2% of Si, 13.6% of Fe, 0.035% of graphene, 0.04% of cerium chloride and the balance of Ni self-fluxing powder in a dry ball-milling mode, wherein the ball-material ratio is 10:1, the diameters of steel balls are 3mm, 5mm and 7mm, the rotating speed is 100r/min, and the ball-milling time is 1.7 h;
the fourth step: taking a mixture of rosin and turpentine with the mass ratio of 1:3 as a binder, mixing the mixture with powder obtained after ball milling in the third step, and uniformly coating the mixture on the surface of the low-carbon steel, wherein the coating thickness is 2.2 mm;
the fifth step: placing the coated low-carbon steel in a forced air drying oven at 110 ℃ for heat preservation for 7.8h to fully volatilize the binder;
and a sixth step: placing the porous ceramic with the thickness of 2.2mm and the area of 100mm multiplied by 10mm above the coating dried in the fifth step, wherein the pore diameter of the porous ceramic is 70 mu m;
the seventh step: placing a layer of hard ceramic with the thickness of 3.1mm above the porous ceramic, wherein the size of the hard ceramic is 100mm multiplied by 10 mm;
eighth step: placing the cladding system obtained in the seventh step into a vacuum heating furnace tube, adding electrodes at two ends of low-carbon steel, adding wires at two ends of the low-carbon steel, leading out the wires from two ends of the vacuum furnace, and connecting the led-out wires into an external power supply, wherein the electric heating system consists of a power supply, a switch, a current adjusting machine, wires and the low-carbon steel, the power supply voltage is 10V, the maximum output current is 130A, and the heating system consists of a vacuum heating furnace and the external electric heating system; the composite coating is arranged on the surface of the low-carbon steel, the low-carbon steel and the surface coating are simultaneously heated by a vacuum furnace and an external electric heating system under the vacuum condition, so that the surface coating is melted and is metallurgically bonded with a low-carbon steel substrate, the ceramic material above the coating is used for preventing the coating from sputtering in a vacuum tube after being melted and for achieving the purpose of vacuum nitriding, and the ceramic material is not used as an additive material of the coating.
The ninth step: vacuumizing a furnace tube of a vacuum heating furnace, wherein the vacuum degree is 70Pa, the temperature of the vacuum heating furnace is 1450 ℃, current is introduced, the output voltage is 15V, the heating time is 5s, and the current is 100A;
the tenth step: after cladding, reducing the temperature of the vacuum furnace to 540 ℃, introducing pure ammonia gas into the heating furnace, wherein the flow rate of the ammonia gas is 90mL/min, and keeping the temperature for 5.2 h;
the eleventh step: and (3) closing ammonia gas after nitriding is finished, cooling the reaction system to room temperature to obtain a required sample, and polishing and flattening the uneven part of the cladding layer by using 400-mesh sand paper.
Finally, compared with a sample without graphene and cerium chloride, the surface hardness of the sample reaches 60.2HRC, the surface hardness is improved by 14%, the sample is corroded by 3.5% NaCl solution, and the corrosion current density is 127.7 muA/cm2The improvement is 21 percent. The friction coefficient is 0.075, and the wear resistance is improved by 20.2%.
Example 2:
the first step is as follows: cutting the low-carbon steel into metal blocks with the size of 100 multiplied by 10 multiplied by 3mm for carrying out high-speed thin-wall transformation, and pretreating the surface of the low-carbon steel by using corundum abrasive paper with the size of 1200 meshes until no obvious rust is formed on the surface of the low-carbon steel;
the second step is that: ultrasonically cleaning the surface of the low-carbon steel by using 97% ethanol solution, and naturally airing in an air environment after cleaning;
the third step: mixing and ball-milling 0.18% of C, 17% of Cr, 3% of B, 0.2% of Si, 14% of Fe, 0.045% of graphene, 0.05% of cerium chloride and the balance of Ni self-fluxing powder in a dry ball-milling mode, wherein the ball-material ratio is 10:1, the diameter of a steel ball is 3mm, 5mm and 7mm, the rotating speed is 110r/min, and the ball-milling time is 1.8 h;
the fourth step: mixing the components in a mass ratio of 1:3, taking the mixture of rosin and turpentine as a binder, mixing the binder with the powder obtained after ball milling in the third step, and uniformly coating the mixture on the surface of the low-carbon steel, wherein the coating thickness is 2.4 mm;
the fifth step: placing the coated low-carbon steel in a blast drying oven at 120 ℃ for heat preservation for 7.2h to fully volatilize the binder;
and a sixth step: placing the porous ceramic with the thickness of 2.4mm and the area of 100mm multiplied by 10mm above the coating dried in the fifth step, wherein the pore diameter of the porous ceramic is 80 mu m;
the seventh step: placing a layer of hard ceramic with the thickness of 3.5mm above the porous ceramic, wherein the size of the hard ceramic is 100mm multiplied by 10 mm;
eighth step: placing the cladding system obtained in the seventh step into a vacuum heating furnace tube, adding electrodes at two ends of low-carbon steel, adding wires at two ends of the low-carbon steel, leading out the wires from two ends of the vacuum furnace, and connecting the led-out wires to an external power supply, wherein the electric heating system consists of a power supply, a switch, a current regulating machine, wires and the low-carbon steel, the power supply voltage is 16V, the maximum output current is 150A, and the heating system consists of a vacuum heating furnace and the external electric heating system; the composite coating is arranged on the surface of the low-carbon steel, the low-carbon steel and the surface coating are simultaneously heated by a vacuum furnace and an external electric heating system under the vacuum condition, so that the surface coating is melted and is metallurgically bonded with a low-carbon steel substrate, the ceramic material above the coating is used for preventing the coating from sputtering in a vacuum tube after being melted and for achieving the purpose of vacuum nitriding, and the ceramic material is not used as an additive material of the coating.
The ninth step: vacuumizing a furnace tube of a vacuum heating furnace, wherein the vacuum degree is 80Pa, the temperature of the vacuum heating furnace is 1200 ℃, and current is introduced, the output voltage is 20V, the heating time is 8s, and the current is 150A;
the tenth step: after cladding, reducing the temperature of the vacuum furnace to 530 ℃, introducing pure ammonia gas into the heating furnace, wherein the flow rate of the ammonia gas is 96mL/min, and keeping the temperature for 5.5 h;
the eleventh step: and (3) closing ammonia gas after nitriding is finished, cooling the reaction system to room temperature to obtain a required sample, and polishing and flattening the uneven part of the cladding layer by using 600-mesh abrasive paper.
Finally, compared with a sample without graphene and cerium chloride, the surface hardness of the sample reaches 61.7HRC, the surface hardness is improved by 15%, the sample is corroded by 3.5% NaCl solution, and the corrosion current density is 125.8 muA/cm2And the improvement is 20 percent. The friction coefficient is 0.074, and the wear resistance is improved by 20.3 percent.
Example 3:
the first step is as follows: cutting the low-carbon steel into metal blocks with the size of 100 multiplied by 10 multiplied by 3mm for carrying out high-speed thin-wall transformation, and pretreating the surface of the low-carbon steel by using corundum abrasive paper with the size of 1200 meshes until no obvious rust is formed on the surface of the low-carbon steel;
the second step is that: ultrasonically cleaning the surface of the low-carbon steel by using an ethanol solution with the concentration of 98%, and naturally airing in an air environment after cleaning;
the third step: mixing and ball-milling 0.25% of C, 15% of Cr, 3.3% of B, 0.2% of Si, 14.8% of Fe, 0.06% of graphene, 0.05% of cerium chloride and the balance of Ni self-fluxing powder in a dry ball-milling mode, wherein the ball-material ratio is 10:1, the diameters of steel balls are 3mm, 5mm and 7mm, the rotating speed is 110r/min, and the ball-milling time is 2 h;
the fourth step: mixing the components in a mass ratio of 1:3, taking the mixture of rosin and turpentine as a binder, mixing the binder with the powder obtained after ball milling in the third step, and uniformly coating the mixture on the surface of the low-carbon steel, wherein the coating thickness is 2.5 mm;
the fifth step: placing the coated low-carbon steel in a forced air drying oven at 110 ℃ for heat preservation for 8 hours to fully volatilize the binder;
and a sixth step: placing the porous ceramic with the thickness of 2.5mm and the area of 100mm multiplied by 10mm above the coating dried in the fifth step, wherein the pore diameter of the porous ceramic is 90 mu m;
the seventh step: placing a layer of hard ceramic with the thickness of 3.7mm above the porous ceramic, wherein the size of the hard ceramic is 100mm multiplied by 10 mm;
eighth step: placing the cladding system obtained in the seventh step into a vacuum heating furnace tube, adding electrodes at two ends of low-carbon steel, adding wires at two ends of the low-carbon steel, leading out the wires from two ends of the vacuum furnace, and connecting the led-out wires into an external power supply, wherein the electric heating system consists of a power supply, a switch, a current adjusting machine, wires and the low-carbon steel, the power supply voltage is 30V, the maximum output current is 160A, and the heating system consists of a vacuum heating furnace and the external electric heating system; the composite coating is arranged on the surface of the low-carbon steel, the low-carbon steel and the surface coating are simultaneously heated by a vacuum furnace and an external electric heating system under the vacuum condition, so that the surface coating is melted and is metallurgically bonded with a low-carbon steel substrate, the ceramic material above the coating is used for preventing the coating from sputtering in a vacuum tube after being melted and for achieving the purpose of vacuum nitriding, and the ceramic material is not used as an additive material of the coating.
The ninth step: vacuumizing a furnace tube of a vacuum heating furnace, wherein the vacuum degree is 60Pa, the temperature of the vacuum heating furnace is set to 1300 ℃, current is introduced, the output voltage is 26V, the heating time is 8s, and the current is 160A;
the tenth step: after cladding, reducing the temperature of the vacuum furnace to 550 ℃, introducing pure ammonia gas into the heating furnace, wherein the flow rate of the ammonia gas is 95mL/min, and keeping the temperature for 5.5 h;
the eleventh step: and (3) closing ammonia gas after nitriding is finished, cooling the reaction system to room temperature to obtain a required sample, and polishing and flattening the uneven part of the cladding layer by using 600-mesh abrasive paper.
Finally, compared with a sample without graphene and cerium chloride, the surface hardness of the sample reaches 62.3HRC, the surface hardness is improved by 16%, the sample is corroded by 3.5% NaCl solution, and the corrosion current density is 124.9 muA/cm2The improvement is 19 percent. The friction coefficient is 0.075, and the wear resistance is improved by 21%.
Claims (8)
1. A method for preparing a high-strength wear-resistant corrosion-resistant composite coating on the surface of low-carbon steel is characterized by comprising the following steps: firstly, treating the surface of low-carbon steel, and then adding a mixed coating consisting of rare earth, graphene and Ni self-fluxing powder on the surface of the low-carbon steel; then adding a porous ceramic block on the upper layer of the coating, and then adding a hard ceramic block; electrodes are added at two ends of the low-carbon steel, mixed heat treatment of induction cladding and electrode heating is carried out under the vacuum condition, then nitriding treatment is carried out under the vacuum condition, and finally the high-strength wear-resistant corrosion-resistant composite coating is prepared on the surface of the low-carbon steel.
2. The method for preparing the high-strength wear-resistant corrosion-resistant composite coating on the surface of the low-carbon steel according to claim 1, which is characterized by comprising the following steps of:
the method comprises the following steps: cleaning, derusting and cleaning the surface of the low-carbon steel;
step two: mixing and ball-milling self-fluxing powder which comprises 0.10-0.25% of C, 15-18% of Cr, 3-4% of B, 0.2-0.3% of Si, 13-15% of Fe, 0.03-0.06% of graphene, 0.04-0.06% of cerium chloride and the balance of Ni in percentage by mass;
step three: mixing the powder obtained after ball milling with a binder, and uniformly coating the mixture on the surface of the low-carbon steel, wherein the coating thickness is 2-2.5 mm;
step four: placing the coated low-carbon steel in a forced air drying oven at 110-120 ℃ for heat preservation for 7-8 h to fully volatilize the binder;
step five: placing the porous ceramic above the dried coating in the fourth step, and placing a layer of hard ceramic above the porous ceramic;
step six: placing the cladding system obtained in the fifth step in a vacuum heating furnace tube, adding wires at two ends of the low-carbon steel, leading out the wires from two ends of the vacuum heating furnace, and connecting the led-out wires to an external power supply;
step seven: vacuumizing a furnace tube of a vacuum heating furnace, wherein the vacuum degree is 50-80Pa, the temperature of the vacuum heating furnace is set to be 1100-1450 ℃, current is introduced, the output voltage is 14-26V, the heating time is 5-10 s, and the current is 90-160A;
step eight: after the cladding is finished, reducing the temperature of the vacuum furnace to 520-550 ℃, introducing pure ammonia gas into the heating furnace, and keeping the temperature for 5-6 h;
step nine: and (3) closing ammonia gas after nitriding is finished, cooling the reaction system to room temperature to obtain a required sample, and polishing and flattening the uneven part of the cladding layer by using 300-sand 600-mesh sand paper.
3. The method for preparing the high-strength wear-resistant corrosion-resistant composite coating on the surface of the low-carbon steel according to claim 2, which is characterized in that: in the first step, firstly, low-carbon steel is cut into metal blocks with the size of 100 multiplied by 10 multiplied by 3mm for thin-wall transformation, and the surface of the low-carbon steel is pretreated by corundum abrasive paper with the size of 300-1200 meshes until no obvious rust is generated on the surface of the low-carbon steel; and then ultrasonically cleaning the surface of the low-carbon steel by using an ethanol solution with the concentration of 98%, and naturally airing in an air environment after cleaning.
4. The method for preparing the high-strength wear-resistant corrosion-resistant composite coating on the surface of the low-carbon steel according to claim 2, which is characterized in that: in the second step, the ball milling mode is dry ball milling, the ball-material ratio is 10:1, the diameters of the steel balls are 3mm, 5mm and 7mm, the rotating speed is 100r/min-120r/min, and the ball milling time is 1.5h-2 h.
5. The method for preparing the high-strength wear-resistant corrosion-resistant composite coating on the surface of the low-carbon steel according to claim 2, which is characterized in that: in the third step, the mass ratio of 1:3 as a binder.
6. The method for preparing the high-strength wear-resistant corrosion-resistant composite coating on the surface of the low-carbon steel according to claim 2, which is characterized in that: in the fifth step, the thickness of the porous ceramic is 2mm-2.5mm, the area size is 100mm multiplied by 10mm, and the pore diameter of the porous ceramic is 60-100 mu m; and a layer of hard ceramic is placed above the porous ceramic, the thickness of the hard ceramic is 3mm-4mm, and the size of the hard ceramic is 100mm multiplied by 10 mm.
7. The method for preparing the high-strength wear-resistant corrosion-resistant composite coating on the surface of the low-carbon steel according to claim 2, which is characterized in that: in the sixth step, a heating system is formed by the vacuum heating furnace tube and the external electric heating system; comprises a power supply, a switch, a current regulator and a wire, wherein the power supply voltage is 2-36V, and the maximum output current is 120-180A.
8. The method for preparing the high-strength wear-resistant corrosion-resistant composite coating on the surface of the low-carbon steel according to claim 2, which is characterized in that: in the step eight, the flow rate of the ammonia gas is 90-100 mL/min.
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| JPS5942187A (en) * | 1982-09-02 | 1984-03-08 | Kobe Steel Ltd | Welding method of composite metallic material |
| CN103266318A (en) * | 2013-06-17 | 2013-08-28 | 铜陵学院 | One-step reinforcement processing method of laser cladding laminated coating based on melting point difference |
| WO2014178810A2 (en) * | 2013-04-30 | 2014-11-06 | Boryshchuk Vladislav | Motor fuel |
| CN108893734A (en) * | 2018-07-02 | 2018-11-27 | 中北大学 | A kind of surface of low-carbon steel duplex heat treatment and preparation method thereof |
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| CN107685149B (en) * | 2017-08-28 | 2019-12-03 | 江苏大学 | A kind of method and device improving laser gain material manufacture thin-wall part forming quality |
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| JPS5942187A (en) * | 1982-09-02 | 1984-03-08 | Kobe Steel Ltd | Welding method of composite metallic material |
| WO2014178810A2 (en) * | 2013-04-30 | 2014-11-06 | Boryshchuk Vladislav | Motor fuel |
| CN103266318A (en) * | 2013-06-17 | 2013-08-28 | 铜陵学院 | One-step reinforcement processing method of laser cladding laminated coating based on melting point difference |
| CN108893734A (en) * | 2018-07-02 | 2018-11-27 | 中北大学 | A kind of surface of low-carbon steel duplex heat treatment and preparation method thereof |
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