High-wear-resistance low-alloy steel strip and processing technology thereof

Abstract

The invention relates to the technical field of steel strip preparation, in particular to a high-wear-resistance low-alloy steel strip and a machining process thereof. Steel strip raw materials are sequentially subjected to smelting casting, hot rolling, cold rolling and annealing, and the steel strip is obtained. And then the surface of the steel strip is coated with the metal cladding powder through a laser cladding technology, and the steel strip with the metal wear-resistant coating is obtained. Dipping the steel strip in a dopamine pretreatment solution to obtain a pretreated steel strip; and finally, a wear-resistant coating, a hydrophobic coating and a graphene wear-resistant coating are sequentially prepared on the surface of the pretreated steel strip, and a high-wear-resistance low-alloy steel strip finished product is obtained. The finished product prepared by the method has good wear resistance, hydrophobicity and corrosion resistance, so that the method has a wide application prospect in the technical field of steel belt preparation.

Description

Technical Field

[0001] The invention relates to the technical field of steel strip preparation, in particular to a high-wear-resistant low-alloy steel strip and a processing technology thereof. Background Art

[0002] Low-alloy steel strip holds significant value in modern industry and technology. Its widespread application and superior performance make it an indispensable material in a wide range of fields. Low-alloy steel strip significantly enhances the mechanical properties and corrosion resistance of ordinary steel by adding small amounts of alloying elements (such as nickel, chromium, molybdenum, and vanadium). The addition of these alloying elements gives the steel strip exceptional strength, toughness, wear resistance, and fatigue resistance, enabling it to meet the stringent requirements of complex operating conditions. For example, in automotive manufacturing, low-alloy steel strip is used to manufacture high-strength body components, reducing weight and improving safety. Furthermore, compared to high-alloy steel, low-alloy steel strip has lower production costs, while its performance approaches or even exceeds that of some high-alloy steels. This cost-effectiveness makes it more competitive in industrial production. Furthermore, the use of low-alloy steel strip reduces material waste and extends equipment life, thereby achieving efficient resource utilization. For example, in the energy sector, low-alloy steel strip is used to manufacture wear-resistant and corrosion-resistant pipes and equipment, reducing maintenance and replacement costs.

[0003] However, low-alloy steel strips are widely used in environments subject to severe corrosion and wear, such as chemical equipment, marine engineering, and energy pipelines. In these applications, material corrosion and wear can directly lead to equipment failure and economic losses. Improving the corrosion and wear resistance of low-alloy steel strips can significantly extend the service life of these equipment. For example, in marine environments, steel strips can quickly fail due to seawater corrosion. Improving their hydrophobicity and corrosion resistance can effectively slow the corrosion rate, thereby reducing maintenance and replacement costs.

[0004] In order to overcome the defects of the prior art, the present invention provides a high-wear-resistant low-alloy steel strip and a processing technology thereof. Summary of the Invention

[0005] The object of the present invention is to provide a high wear-resistant low alloy steel strip and a processing technology thereof, so as to solve the problems in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A process for processing a high-wear-resistant low-alloy steel strip comprises the following steps:

[0008] Step 1: The steel strip raw material is sequentially smelted, cast, hot-rolled, cold-rolled, and annealed to obtain a steel strip; the metal cladding powder is applied to the surface of the steel strip through a laser cladding process to obtain a metal wear-resistant coating; the steel strip is immersed in a dopamine pretreatment solution, dried at 35-40°C for 10-15 hours, and then washed and dried to obtain a pretreated steel strip;

[0009] Step 2: Fully mix deionized water, ammonia water, and silica sol to obtain silicon liquid; then dropwise add the silicon liquid and tetraethyl orthosilicate into anhydrous ethanol, stir and react at 50-60°C for 40-60 minutes, then dropwise add the wear-resistant modified solution, and fully stir for 25-30 minutes to obtain a wear-resistant coating;

[0010] Dissolve nickel nitrate hexahydrate and aluminum nitrate nonahydrate in 1 / 2 part by mass of deionized water to obtain a salt solution; dissolve urea in 1 / 2 part by mass of deionized water to obtain an alkaline solution; mix the alkaline solution and the salt solution, and hydrothermally react at 120-140° C. for 15-18 hours to obtain a hydrotalcite material; add the hydrophobic modification solution and polyvinylidene fluoride filler to the hydrotalcite material, and stir thoroughly at 50-60° C. for 25-30 minutes to obtain a hydrophobic coating;

[0011] Step 3: At 25-30°C, spray the wear-resistant coating onto the surface of the pretreated steel strip to obtain a wear-resistant layer; then apply the hydrophobic coating to the surface of the wear-resistant layer to obtain a hydrophobic layer; then rotate the graphene wear-resistant coating at 600-800 rpm for 10-15s and at 2000-2500 rpm for 15-20s to apply it to the surface of the hydrophobic layer, and obtain the finished product through layer-by-layer self-assembly.

[0012] More optimally, in step one, the content of each component of the steel strip raw material is: by mass fraction, 0.07-0.10% C, 1.0-1.2% Mn, 0.05-0.07% P, 0.10-0.12% Nb, 0.005-0.007% N, 0.01-0.02% S, and the balance is Fe and inevitable impurities; the content of each component of the metal cladding powder is: by mass fraction, 2.3-2.5% C, 1.0-1.1% Si, 1.2-1.5% B, 6.3-6.5% V, 5.1-5.2% Cr, and the balance is Fe and inevitable impurities.

[0013] More optimally, in step one, the hot rolling temperature is 700-900°C, and the annealing temperature is 600-900°C; in the laser cladding process, the laser power is 1800-2000W, the powder feeding rate is 20-30g / min, and the scanning speed is 400-500mm / min.

[0014] More optimally, in step 1, sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate are dissolved in deionized water, and then sodium hydroxide solution is added dropwise to adjust the pH to 10.0-10.5 to obtain an alkaline phosphate buffer solution; dopamine hydrochloride powder is dissolved in the alkaline phosphate buffer solution to obtain a dopamine pretreatment solution.

[0015] More optimally, the reaction mass ratio of sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate is (0.8-0.9):8; the mass volume ratio of dopamine hydrochloride powder and alkaline phosphate buffer is 1:1.

[0016] More optimally, in step 2, 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane are dissolved in anhydrous ethanol at a reaction volume ratio of 1:(3-4) to obtain a wear-resistant modified solution; 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane are dissolved in anhydrous ethanol at a reaction volume ratio of (3-4):1 to obtain a hydrophobic modified solution.

[0017] More optimally, in step 2, the contents of the components of the wear-resistant coating are: by mass fraction, 150-160 parts of deionized water, 70-80 parts of ammonia water, 20-25 parts of silica sol, 10-12 parts of tetraethyl orthosilicate, 1000-1200 parts of anhydrous ethanol, and 8-10 parts of wear-resistant modified solution; the contents of the components of the hydrophobic coating are: by mass fraction, 15-18 parts of nickel nitrate hexahydrate, 9-12 parts of aluminum nitrate nonahydrate, 10-15 parts of urea, 50-60 parts of deionized water, 5-10 parts of hydrophobic modified solution, and 10-15 parts of polyvinylidene fluoride filler; and the concentration of ammonia water is 20-25%.

[0018] More optimally, in step three, the reduced graphene oxide is dispersed in deionized water to obtain a reduced graphene oxide solution; polyvinyl alcohol is added to the deionized water and stirred at 85-90°C for 1-2 hours to obtain a polyvinyl alcohol solution; the reduced graphene oxide solution is then added to the polyvinyl alcohol solution and ultrasonically dispersed for 30-40 minutes to obtain a graphene wear-resistant coating.

[0019] More optimally, the reaction mass ratio of reduced graphene oxide and polyvinyl alcohol is 1:(1.2-1.5).

[0020] Beneficial effects of the present invention:

[0021] The present invention is characterized in that, in step 1, a steel strip is first prepared, and then a metal cladding powder with good corrosion resistance is obtained by adjusting the amount of C, Si, and B in the metal cladding powder. The metal cladding powder is then applied to the surface of the steel strip through a laser cladding process to obtain a steel strip with a metal wear-resistant coating. By rationally adjusting the amount of C, Si, and B in this step, hard carbides and borides can be formed, effectively improving the wear resistance and hardness of the cladding layer. Furthermore, in step 1, the steel strip with the metal wear-resistant coating is also immersed in a dopamine pretreatment solution to obtain a pretreated steel strip. This step forms a polydopamine adhesion layer on the surface of the steel strip, which can form a strong chemical bond with the surface of the steel strip, thereby changing the chemical properties of the steel strip surface and facilitating the wetting and penetration of the subsequent coating. In addition, the polydopamine layer itself has certain anti-corrosion properties and can serve as a barrier to prevent corrosive media from eroding the steel strip. It synergizes with the subsequent hydrophobic corrosion-resistant layer to form a multi-layer protection system, thereby improving the overall corrosion resistance.

[0022] The present invention is characterized in that, in step 2, a nano-silica structure is prepared by adding deionized water, ammonia water, silica sol, tetraethyl orthosilicate, and anhydrous ethanol, and then a wear-resistant modified solution of 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane in a reaction volume ratio of 1:(3-4) is added to prepare a wear-resistant coating. This step can fine-tune the roughness of the coating surface by introducing nano-silica, forming a rough structure at the micro-nano level, thereby increasing the friction and wear resistance of the coating. By introducing hexadecyltrimethoxysilane, an organic silicon compound with a long-chain alkyl structure, the hydrophobicity of the coating can be significantly improved. The highly hydrophobic coating surface is not easily wetted by water and other liquids, which reduces the adsorption of liquid on the friction surface, thereby reducing wear.

[0023] A hydrotalcite material was prepared by adding nickel nitrate hexahydrate, aluminum nitrate nonahydrate, urea, and deionized water. A hydrophobic coating was then prepared by adding a hydrophobic-modified solution of 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane in a reaction volume ratio of (3-4) to 1 and a polyvinylidene fluoride filler. The polyvinylidene fluoride filler significantly reduces the surface energy and increases the surface roughness of the coating through its low surface energy properties and micro-nano rough structure. 1H,1H,2H,2H-perfluorodecyltriethoxysilane forms a dense hydrophobic film on the coating surface through its ultra-low surface energy perfluoroalkyl chain and chemical bonding. The synergistic effect of the two creates a hydrophobic structure on the coating surface that combines "low surface energy with a rough surface," resulting in excellent hydrophobicity. In addition, the combined effect of hexadecyltrimethoxysilane and 1H,1H,2H,2H-perfluorodecyltriethoxysilane can further reduce the surface energy of the coating and optimize the surface structure of the coating.

[0024] A graphene wear-resistant coating is prepared by adding polyvinyl alcohol and reduced graphene oxide. By adding graphene, a protective barrier can be formed on the surface of the material to prevent abrasive particles in the external environment from directly contacting the base material, thereby reducing wear. By adding polyvinyl alcohol molecules, the adhesion between the graphene sheets and the lower surface can be improved, thereby preventing them from peeling off and forming a compact shell structure. Then, through layer-by-layer self-assembly technology, alternating deposition of reduced graphene oxide can improve a certain degree of wear resistance. In summary, the finished product prepared by the present invention has good wear resistance, hydrophobicity and corrosion resistance, and therefore has broad application prospects in the field of steel strip preparation technology. DETAILED DESCRIPTION

[0025] The following will provide a clear and complete description of the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] Source of raw materials:

[0027] Dopamine hydrochloride powder, provided by Sigma-Aldrich, with a specification of 99%; silica sol, provided by Nanjing Wanqing Chemical Glass Instrument Co., Ltd., with a SiO2 content of 15wt%; polyvinylidene fluoride filler, provided by Dongguan Zhanyang Polymer Materials Co., Ltd., with a specification of analytical grade; reduced graphene oxide, provided by Beijing Meiston Technology Development Co., Ltd., model SY-rGO-S, with an active ingredient content of 96%; polyvinyl alcohol, provided by Shanghai Yien Chemical Technology Co., Ltd., with a molecular weight of 200,000.

[0028] Example 1: Step 1: Dissolve sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate in deionized water, and then add sodium hydroxide solution dropwise to adjust the pH to 10.0 to obtain an alkaline phosphate buffer solution; dissolve dopamine hydrochloride powder in the alkaline phosphate buffer solution to obtain a dopamine pretreatment solution; wherein the reaction mass ratio of sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate is 0.85:8; and the mass volume ratio of dopamine hydrochloride powder to alkaline phosphate buffer solution is 1:1;

[0029] The steel strip raw material is sequentially subjected to smelting, casting, hot rolling, cold rolling and annealing to obtain a steel strip; the metal cladding powder is applied to the surface of the steel strip by a laser cladding process to obtain a metal wear-resistant coating; the steel strip is immersed in a dopamine pretreatment solution, dried at 40°C for 15 hours, washed and dried after drying to obtain a pretreated steel strip; the content of each component of the steel strip raw material is: by mass fraction, 0.08% C, 1.1% Mn, 0.06% P, 0.1% Nb, 0.0 06% N, 0.01% S, with the balance being Fe and unavoidable impurities; the metal cladding powder composition is, by mass, 2.4% C, 1% Si, 1.3% B, 6.4% V, 5.1% Cr, with the balance being Fe and unavoidable impurities; the hot rolling temperature is 900°C, and the annealing temperature is 900°C; the laser cladding process is: laser power 2000W, powder feed rate 30g / min, and scanning speed 500mm / min;

[0030] Step 2: 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane are dissolved in anhydrous ethanol at a reaction volume ratio of 1:3.5 to obtain a wear-resistant modified solution; 150 parts of deionized water, 70 parts of ammonia water, and 20 parts of silica sol are fully mixed to obtain a silicon liquid; the silicon liquid and 10 parts of tetraethyl orthosilicate are then added dropwise to 1000 parts of anhydrous ethanol, stirred and reacted at 60°C for 60 minutes, and then 8 parts of the wear-resistant modified solution are added dropwise and fully stirred for 30 minutes to obtain a wear-resistant coating; the ammonia concentration is 20%;

[0031] 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane were dissolved in anhydrous ethanol at a reaction volume ratio of 3.5:1 to obtain a hydrophobic modification solution; 15 parts of nickel nitrate hexahydrate and 9 parts of aluminum nitrate nonahydrate were dissolved in 25 parts of deionized water to obtain a salt solution; 10 parts of urea were dissolved in 25 parts of deionized water to obtain an alkaline solution; the alkaline solution and the salt solution were mixed and hydrothermally reacted at 140°C for 18 hours to obtain a hydrotalcite material; 5 parts of the hydrophobic modification solution and 10 parts of polyvinylidene fluoride filler were added to the hydrotalcite material and stirred at 60°C for 30 minutes to obtain a hydrophobic coating;

[0032] Step 3: dispersing the reduced graphene oxide in deionized water to obtain a reduced graphene oxide solution; adding polyvinyl alcohol to the deionized water and stirring at 90°C for 2 hours to obtain a polyvinyl alcohol solution; then adding the reduced graphene oxide solution to the polyvinyl alcohol solution and ultrasonically dispersing for 40 minutes to obtain a graphene wear-resistant coating; wherein the reaction mass ratio of the reduced graphene oxide to the polyvinyl alcohol is 1:1.3;

[0033] At 30°C, the wear-resistant coating is sprayed onto the surface of the pretreated steel strip to obtain a wear-resistant layer; then the hydrophobic coating is applied to the surface of the wear-resistant layer to obtain a hydrophobic layer; then the graphene wear-resistant coating is rotated at 800 rpm for 15 seconds and at 2500 rpm for 20 seconds to apply to the surface of the hydrophobic layer, and the finished product is obtained through layer-by-layer self-assembly.

[0034] Example 2: Step 1: Dissolve sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate in deionized water, and then add sodium hydroxide solution dropwise to adjust the pH to 10.0 to obtain an alkaline phosphate buffer solution; dissolve dopamine hydrochloride powder in the alkaline phosphate buffer solution to obtain a dopamine pretreatment solution; wherein the reaction mass ratio of sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate is 0.85:8; and the mass volume ratio of dopamine hydrochloride powder to alkaline phosphate buffer solution is 1:1;

[0035] The steel strip raw material is sequentially subjected to smelting casting, hot rolling, cold rolling and annealing to obtain a steel strip; the metal cladding powder is applied to the surface of the steel strip by a laser cladding process to obtain a metal wear-resistant coating; the steel strip is immersed in a dopamine pretreatment solution, dried at 37°C for 12 hours, washed and dried after drying to obtain a pretreated steel strip; the content of each component of the steel strip raw material is: by mass fraction, 0.08% C, 1.1% Mn, 0.06% P, 0.1% Nb, 0.0 06% N, 0.01% S, with the balance being Fe and unavoidable impurities. The metal cladding powder contains, by mass, 2.4% C, 1% Si, 1.3% B, 6.4% V, and 5.1% Cr, with the balance being Fe and unavoidable impurities. The hot rolling temperature is 800°C, and the annealing temperature is 700°C. The laser cladding process uses a laser power of 1900W, a powder feed rate of 25g / min, and a scanning speed of 450mm / min.

[0036] Step 2: 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane are dissolved in anhydrous ethanol at a reaction volume ratio of 1:3.5 to obtain a wear-resistant modified solution; 150 parts of deionized water, 70 parts of ammonia water, and 20 parts of silica sol are fully mixed to obtain a silicon liquid; the silicon liquid and 10 parts of tetraethyl orthosilicate are then added dropwise to 1000 parts of anhydrous ethanol, stirred and reacted at 55°C for 50 minutes, and then 8 parts of the wear-resistant modified solution are added dropwise and fully stirred for 27 minutes to obtain a wear-resistant coating; the ammonia concentration is 20%;

[0037] 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane were dissolved in anhydrous ethanol at a reaction volume ratio of 3.5:1 to obtain a hydrophobic modification solution; 15 parts of nickel nitrate hexahydrate and 9 parts of aluminum nitrate nonahydrate were dissolved in 25 parts of deionized water to obtain a salt solution; 10 parts of urea were dissolved in 25 parts of deionized water to obtain an alkaline solution; the alkaline solution and the salt solution were mixed and hydrothermally reacted at 130°C for 17 hours to obtain a hydrotalcite material; 5 parts of the hydrophobic modification solution and 10 parts of polyvinylidene fluoride filler were added to the hydrotalcite material and stirred at 55°C for 27 minutes to obtain a hydrophobic coating;

[0038] Step 3: dispersing the reduced graphene oxide in deionized water to obtain a reduced graphene oxide solution; adding polyvinyl alcohol to the deionized water and stirring at 87°C for 1.5 hours to obtain a polyvinyl alcohol solution; then adding the reduced graphene oxide solution to the polyvinyl alcohol solution and ultrasonically dispersing for 35 minutes to obtain a graphene wear-resistant coating; wherein the reaction mass ratio of the reduced graphene oxide to the polyvinyl alcohol is 1:1.3;

[0039] At 27°C, the wear-resistant coating was sprayed onto the surface of the pretreated steel strip to obtain a wear-resistant layer; then the hydrophobic coating was applied to the surface of the wear-resistant layer to obtain a hydrophobic layer; then the graphene wear-resistant coating was rotated at 700 rpm for 13 seconds and at 2250 rpm for 17 seconds to apply to the surface of the hydrophobic layer, and the finished product was obtained through layer-by-layer self-assembly.

[0040] Example 3: Step 1: Dissolve sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate in deionized water, and then add sodium hydroxide solution dropwise to adjust the pH to 10.0 to obtain an alkaline phosphate buffer solution; dissolve dopamine hydrochloride powder in the alkaline phosphate buffer solution to obtain a dopamine pretreatment solution; wherein the reaction mass ratio of sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate is 0.85:8; and the mass volume ratio of dopamine hydrochloride powder to alkaline phosphate buffer solution is 1:1;

[0041] The steel strip raw material is sequentially subjected to smelting casting, hot rolling, cold rolling and annealing to obtain a steel strip; the metal cladding powder is applied to the surface of the steel strip by a laser cladding process to obtain a metal wear-resistant coating; the steel strip is immersed in a dopamine pretreatment solution, dried at 35°C for 10 hours, washed and dried after drying to obtain a pretreated steel strip; the content of each component of the steel strip raw material is: by mass fraction, 0.08% C, 1.1% Mn, 0.06% P, 0.1% Nb, 0.0 06% N, 0.01% S, with the balance being Fe and unavoidable impurities. The metal cladding powder contains, by mass, 2.4% C, 1% Si, 1.3% B, 6.4% V, and 5.1% Cr, with the balance being Fe and unavoidable impurities. The hot rolling temperature is 700°C, and the annealing temperature is 600°C. The laser cladding process uses a laser power of 1800W, a powder feed rate of 20g / min, and a scanning speed of 400mm / min.

[0042] Step 2: 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane are dissolved in anhydrous ethanol at a reaction volume ratio of 1:3.5 to obtain a wear-resistant modified solution; 150 parts of deionized water, 70 parts of ammonia water, and 20 parts of silica sol are fully mixed to obtain a silicon liquid; the silicon liquid and 10 parts of tetraethyl orthosilicate are then added dropwise to 1000 parts of anhydrous ethanol, stirred and reacted at 50°C for 40 minutes, and then 8 parts of the wear-resistant modified solution are added dropwise and fully stirred for 25 minutes to obtain a wear-resistant coating; the ammonia concentration is 20%;

[0043] 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane were dissolved in anhydrous ethanol at a reaction volume ratio of 3.5:1 to obtain a hydrophobic modification solution; 15 parts of nickel nitrate hexahydrate and 9 parts of aluminum nitrate nonahydrate were dissolved in 25 parts of deionized water to obtain a salt solution; 10 parts of urea were dissolved in 25 parts of deionized water to obtain an alkaline solution; the alkaline solution and the salt solution were mixed and hydrothermally reacted at 120°C for 15 hours to obtain a hydrotalcite material; 5 parts of the hydrophobic modification solution and 10 parts of polyvinylidene fluoride filler were added to the hydrotalcite material and stirred at 50°C for 25 minutes to obtain a hydrophobic coating;

[0044] Step 3: dispersing the reduced graphene oxide in deionized water to obtain a reduced graphene oxide solution; adding polyvinyl alcohol to the deionized water and stirring at 85°C for 1 hour to obtain a polyvinyl alcohol solution; then adding the reduced graphene oxide solution to the polyvinyl alcohol solution and ultrasonically dispersing for 30 minutes to obtain a graphene wear-resistant coating; wherein the reaction mass ratio of the reduced graphene oxide to the polyvinyl alcohol is 1:1.3;

[0045] At 25°C, the wear-resistant coating is sprayed onto the surface of the pretreated steel strip to obtain a wear-resistant layer; then the hydrophobic coating is applied to the surface of the wear-resistant layer to obtain a hydrophobic layer; then the graphene wear-resistant coating is rotated at 600 rpm for 10 seconds and at 2000 rpm for 15 seconds to apply to the surface of the hydrophobic layer, and the finished product is obtained through layer-by-layer self-assembly.

[0046] Comparative Example 1: The wear-resistant layer was removed, and the rest was the same as Example 1, with the following specific steps: Step 1: Sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate were dissolved in deionized water, and sodium hydroxide solution was added dropwise to adjust the pH to 10.0 to obtain an alkaline phosphate buffer solution; dopamine hydrochloride powder was dissolved in the alkaline phosphate buffer solution to obtain a dopamine pretreatment solution; wherein the reaction mass ratio of sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate was 0.85:8; and the mass volume ratio of dopamine hydrochloride powder and alkaline phosphate buffer solution was 1:1;

[0047] The steel strip raw material is sequentially subjected to smelting, casting, hot rolling, cold rolling and annealing to obtain a steel strip; the metal cladding powder is applied to the surface of the steel strip by a laser cladding process to obtain a metal wear-resistant coating; the steel strip is immersed in a dopamine pretreatment solution, dried at 40°C for 15 hours, washed and dried after drying to obtain a pretreated steel strip; the content of each component of the steel strip raw material is: by mass fraction, 0.08% C, 1.1% Mn, 0.06% P, 0.1% Nb, 0.0 06% N, 0.01% S, with the balance being Fe and unavoidable impurities; the metal cladding powder composition is, by mass, 2.4% C, 1% Si, 1.3% B, 6.4% V, 5.1% Cr, with the balance being Fe and unavoidable impurities; the hot rolling temperature is 900°C, and the annealing temperature is 900°C; the laser cladding process is: laser power 2000W, powder feed rate 30g / min, and scanning speed 500mm / min;

[0048] Step 2: 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane were dissolved in anhydrous ethanol at a reaction volume ratio of 3.5:1 to obtain a hydrophobic modification solution; 15 parts of nickel nitrate hexahydrate and 9 parts of aluminum nitrate nonahydrate were dissolved in 25 parts of deionized water to obtain a salt solution; 10 parts of urea were dissolved in 25 parts of deionized water to obtain an alkaline solution; the alkaline solution and the salt solution were mixed and hydrothermally reacted at 140°C for 18 hours to obtain a hydrotalcite material; 5 parts of the hydrophobic modification solution and 10 parts of polyvinylidene fluoride filler were added to the hydrotalcite material and stirred at 60°C for 30 minutes to obtain a hydrophobic coating;

[0049] Step 3: dispersing the reduced graphene oxide in deionized water to obtain a reduced graphene oxide solution; adding polyvinyl alcohol to the deionized water and stirring at 90°C for 2 hours to obtain a polyvinyl alcohol solution; then adding the reduced graphene oxide solution to the polyvinyl alcohol solution and ultrasonically dispersing for 40 minutes to obtain a graphene wear-resistant coating; wherein the reaction mass ratio of the reduced graphene oxide to the polyvinyl alcohol is 1:1.3;

[0050] At 30°C, a hydrophobic coating was applied to the surface of a pretreated steel strip to obtain a hydrophobic layer. Then, a graphene wear-resistant coating was applied to the surface of the hydrophobic layer by rotating at 800 rpm for 15 seconds and at 2500 rpm for 20 seconds, and the finished product was obtained through layer-by-layer self-assembly.

[0051] Comparative Example 2: The hydrophobic layer was removed, and the rest was the same as in Example 1, with the following specific steps: Step 1: Sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate were dissolved in deionized water, and sodium hydroxide solution was added dropwise to adjust the pH to 10.0 to obtain an alkaline phosphate buffer solution; dopamine hydrochloride powder was dissolved in the alkaline phosphate buffer solution to obtain a dopamine pretreatment solution; wherein the reaction mass ratio of sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate was 0.85:8; and the mass volume ratio of dopamine hydrochloride powder and alkaline phosphate buffer solution was 1:1;

[0052] The steel strip raw material is sequentially subjected to smelting, casting, hot rolling, cold rolling and annealing to obtain a steel strip; the metal cladding powder is applied to the surface of the steel strip by a laser cladding process to obtain a metal wear-resistant coating; the steel strip is immersed in a dopamine pretreatment solution, dried at 40°C for 15 hours, washed and dried after drying to obtain a pretreated steel strip; the content of each component of the steel strip raw material is: by mass fraction, 0.08% C, 1.1% Mn, 0.06% P, 0.1% Nb, 0.0 06% N, 0.01% S, with the balance being Fe and unavoidable impurities; the metal cladding powder composition is, by mass, 2.4% C, 1% Si, 1.3% B, 6.4% V, 5.1% Cr, with the balance being Fe and unavoidable impurities; the hot rolling temperature is 900°C, and the annealing temperature is 900°C; the laser cladding process is: laser power 2000W, powder feed rate 30g / min, and scanning speed 500mm / min;

[0053] Step 2: 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane are dissolved in anhydrous ethanol at a reaction volume ratio of 1:3.5 to obtain a wear-resistant modified solution; 150 parts of deionized water, 70 parts of ammonia water, and 20 parts of silica sol are fully mixed to obtain a silicon liquid; the silicon liquid and 10 parts of tetraethyl orthosilicate are then added dropwise to 1000 parts of anhydrous ethanol, stirred and reacted at 60°C for 60 minutes, and then 8 parts of the wear-resistant modified solution are added dropwise and fully stirred for 30 minutes to obtain a wear-resistant coating; the ammonia concentration is 20%;

[0054] Step 3: dispersing the reduced graphene oxide in deionized water to obtain a reduced graphene oxide solution; adding polyvinyl alcohol to the deionized water and stirring at 90°C for 2 hours to obtain a polyvinyl alcohol solution; then adding the reduced graphene oxide solution to the polyvinyl alcohol solution and ultrasonically dispersing for 40 minutes to obtain a graphene wear-resistant coating; wherein the reaction mass ratio of the reduced graphene oxide to the polyvinyl alcohol is 1:1.3;

[0055] At 30°C, the wear-resistant coating was sprayed onto the surface of the pretreated steel strip to obtain a wear-resistant layer; then the graphene wear-resistant coating was applied to the surface of the wear-resistant layer by rotating at 800 rpm for 15 seconds and at 2500 rpm for 20 seconds, and the finished product was obtained through layer-by-layer self-assembly.

[0056] Comparative Example 3: All coatings on the surface of the steel strip were removed. The rest was the same as in Example 1, and the specific steps were as follows: Step 1: The steel strip raw material was smelted and cast, hot rolled, cold rolled, and annealed in sequence to obtain a finished steel strip; the content of each component of the steel strip raw material was: by mass fraction, 0.08% C, 1.1% Mn, 0.06% P, 0.1% Nb, 0.006% N, 0.01% S, and the balance was Fe and inevitable impurities; the content of each component of the metal cladding powder was: by mass fraction, 2.4% C, 1% Si, 1.3% B, 6.4% V, 5.1% Cr, and the balance was Fe and inevitable impurities; the hot rolling temperature was 900°C, and the annealing temperature was 900°C.

[0057] Detection test:

[0058] Hardness test: The finished product prepared by the present invention was used as a sample, and the microstructure of the coating interface was observed with a Zeiss metallographic microscope. The Vickers hardness test was performed with reference to the GB / T4340.1-2009 standard. At least 6 different areas of each sample were measured to reduce errors, and the average value was used as the final result.

[0059] Wear resistance test: The finished product prepared by the present invention is used as a specimen. Referring to the ASTM G65-16 standard, a load of 140 N is applied to the specimen. The rubber rotates at a speed of 250 r / min and the gravel contacts the interface at a speed of 300 g / min. The mass loss of the sample after linear wear is tested as a wear resistance test.

[0060] Water contact angle test: The finished product prepared by this invention was used as a sample, and the hydrophobic and corrosion-resistant properties of the sample were characterized by static water contact angle. The sample surface was polished, cleaned, and dried in sequence. Then, a 2 μl water droplet was added to the sample surface. The water contact angle value was read after the droplet stabilized. Each sample was tested at three different locations, and the average value and standard deviation were calculated. The results are shown in the following table:

[0061] Vickers hardness / HV Mass loss / g Water contact angle / ° Example 1 585 125 153 Example 2 584 127 152 Example 3 582 129 151 Comparative Example 1 557 141 137 Comparative Example 2 573 133 122 Comparative Example 3 518 153 108

[0062] Conclusion: The dosage of Examples 1 to 3 remains unchanged, and only some reaction parameters are modified. From the experimental data, it can be seen that there is no significant fluctuation in the performance of the samples.

[0063] Comparative Example 1: The wear-resistant layer is removed, and the rest is the same as Example 1. It can be seen from the experimental data that compared with Example 1, the Vickers hardness is reduced to 557HV, the mass loss is increased to 141g, and the water contact angle is reduced to 137°. The reason is analyzed as follows: the wear-resistant layer contains a large amount of nano-silica, fluorinated silicone and long-chain alkyl silicone, so after removing them, the wear resistance, hydrophobic corrosion resistance and hardness are reduced, so the Vickers hardness is reduced, the mass loss is increased, and the water contact angle is reduced.

[0064] Comparative Example 2: The hydrophobic layer is removed, and the rest is the same as Example 1. It can be seen from the experimental data that compared with Example 1, the Vickers hardness is reduced to 573HV, the mass loss is increased to 133g, and the water contact angle is reduced to 122°. The reason is analyzed as follows: the hydrophobic layer contains a variety of silicones, hydrophobic fillers and a variety of fluorine-containing substances. Therefore, after removing it, the wear resistance, hydrophobic corrosion resistance and hardness are reduced, so the Vickers hardness is reduced, the mass loss is increased, and the water contact angle is reduced.

[0065] Comparative Example 3: All coatings on the surface of the steel strip are removed, and the rest are the same as Example 1. It can be seen from the experimental data that compared with Example 1, the Vickers hardness is reduced to 518HV, the mass loss is increased to 153g, and the water contact angle is reduced to 108°. The reason is analyzed as follows: the coating on the surface of the steel strip has a variety of silicon chains and hydrophobic structures, so it has good wear resistance, hardness and corrosion resistance. Therefore, after removing it, the wear resistance, hydrophobic corrosion resistance and hardness are reduced, so the Vickers hardness is reduced, the mass loss is increased, and the water contact angle is reduced.

[0066] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0067] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A process for processing a high wear-resistant low alloy steel strip, characterized by: The following steps are involved: Step 1: The steel strip raw material is sequentially smelted, cast, hot rolled, cold rolled, and annealed to obtain the steel strip; The metal cladding powder is applied to the surface of the steel strip by a laser cladding process to obtain a metal wear-resistant coating; the steel strip is immersed in a dopamine pretreatment solution, dried at 35-40° C. for 10-15 hours, and then washed and dried to obtain a pretreated steel strip; Step 2: Fully mix deionized water, ammonia water, and silica sol to obtain silicon liquid; then dropwise add the silicon liquid and tetraethyl orthosilicate into anhydrous ethanol, stir and react at 50-60°C for 40-60 minutes, then dropwise add the wear-resistant modified solution, and fully stir for 25-30 minutes to obtain a wear-resistant coating; Dissolve nickel nitrate hexahydrate and aluminum nitrate nonahydrate in 1 / 2 parts by mass of deionized water to obtain a salt solution; Dissolve urea in 1 / 2 part by mass of deionized water to obtain an alkaline solution; mix the alkaline solution and the salt solution, and perform a hydrothermal reaction at 120-140° C. for 15-18 hours to obtain a hydrotalcite material; add the hydrophobic modification solution and the polyvinylidene fluoride filler to the hydrotalcite material, and stir thoroughly at 50-60° C. for 25-30 minutes to obtain a hydrophobic coating; Step 3: At 25-30°C, spray the wear-resistant coating onto the surface of the pretreated steel strip to obtain a wear-resistant layer; then apply the hydrophobic coating to the surface of the wear-resistant layer to obtain a hydrophobic layer; then rotate the graphene wear-resistant coating at 600-800 rpm for 10-15s and at 2000-2500 rpm for 15-20s to apply it to the surface of the hydrophobic layer, and obtain the finished product through layer-by-layer self-assembly.

2. The process for processing a high wear-resistant low alloy steel strip according to claim 1, characterized in that: In step 1, the content of each component of the steel strip raw material is: by mass fraction, 0.07-0.10% C, 1.0-1.2% Mn, 0.05-0.07% P, 0.10-0.12% Nb, 0.005-0.007% N, 0.01-0.02% S, and the balance is Fe and inevitable impurities; the content of each component of the metal cladding powder is: by mass fraction, 2.3-2.5% C, 1.0-1.1% Si, 1.2-1.5% B, 6.3-6.5% V, 5.1-5.2% Cr, and the balance is Fe and inevitable impurities.

3. The process for processing a high wear-resistant low alloy steel strip according to claim 1, characterized in that: In step 1, the hot rolling temperature is 700-900°C, and the annealing temperature is 600-900°C; laser cladding process: the laser power is 1800-2000W, the powder feeding rate is 20-30g / min, and the scanning speed is 400-500mm / min.

4. The process for processing a high wear-resistant low alloy steel strip according to claim 1, characterized in that: In step 1, sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate are dissolved in deionized water, and then sodium hydroxide solution is added dropwise to adjust the pH to 10.0-10.5 to obtain an alkaline phosphate buffer solution; dopamine hydrochloride powder is dissolved in the alkaline phosphate buffer solution to obtain a dopamine pretreatment solution.

5. The process for processing a high wear-resistant low alloy steel strip according to claim 4, characterized in that: The reaction mass ratio of sodium dihydrogen phosphate dihydrate and disodium hydrogen phosphate dodecahydrate is (0.8-0.9):8; the mass volume ratio of dopamine hydrochloride powder and alkaline phosphate buffer is 1:

1.

6. The process for processing a high wear-resistant low alloy steel strip according to claim 1, characterized in that: In step 2, 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane are dissolved in anhydrous ethanol at a reaction volume ratio of 1:(3-4) to obtain a wear-resistant modified solution; 1H,1H,2H,2H-perfluorodecyltriethoxysilane and hexadecyltrimethoxysilane are dissolved in anhydrous ethanol at a reaction volume ratio of (3-4):1 to obtain a hydrophobic modified solution.

7. The process for processing a high wear-resistant low alloy steel strip according to claim 1, characterized in that: In step 2, the contents of the components of the wear-resistant coating are: by mass fraction, 150-160 parts of deionized water, 70-80 parts of ammonia water, 20-25 parts of silica sol, 10-12 parts of tetraethyl orthosilicate, 1000-1200 parts of anhydrous ethanol, and 8-10 parts of wear-resistant modified solution; the contents of the components of the hydrophobic coating are: by mass fraction, 15-18 parts of nickel nitrate hexahydrate, 9-12 parts of aluminum nitrate nonahydrate, 10-15 parts of urea, 50-60 parts of deionized water, 5-10 parts of hydrophobic modified solution, and 10-15 parts of polyvinylidene fluoride filler; wherein the concentration of ammonia water is 20-25%.

8. The process for processing a high wear-resistant low alloy steel strip according to claim 1, characterized in that: In step 3, the reduced graphene oxide is dispersed in deionized water to obtain a reduced graphene oxide solution; polyvinyl alcohol is added to the deionized water and stirred at 85-90° C. for 1-2 hours to obtain a polyvinyl alcohol solution; The reduced graphene oxide solution is then added to the polyvinyl alcohol solution and ultrasonically dispersed for 30-40 minutes to obtain a graphene wear-resistant coating.

9. The process for processing a high wear-resistant low alloy steel strip according to claim 8, characterized in that: The reaction mass ratio of reduced graphene oxide and polyvinyl alcohol is 1:(1.2-1.5).

10. A high wear-resistant low alloy steel strip, characterized in that: Obtained by processing according to any one of claims 1 to 9.