Method for preparing wear-resistant and corrosion-resistant coating on filter cloth tensioning roller surface

Abstract

The application discloses a preparation method of a wear-resistant and corrosion-resistant coating of a filter cloth tensioning roller surface, and the method comprises the following steps: firstly, cleaning the surface of the filter cloth tensioning roller, and performing roughening treatment on the roller surface by using 46# white corundum sand; spraying ceramic powder on the roller surface of the filter cloth tensioning roller by using a plasma spraying device to obtain a ceramic coating; grinding and polishing the ceramic coating on the roller surface of the filter cloth tensioning roller by using a 400# diamond grinding wheel and 2000-mesh corundum abrasive belt respectively; roughening the ceramic coating to obtain uniform roughness; and finally, preparing a 1-3-micron wear-resistant and waterproof film on the surface of the ceramic coating on the roller surface to obtain the filter cloth tensioning roller surface with certain roughness and hardness. The method overcomes the defects of traditional surface treatment of the filter cloth tensioning roller, the ceramic coating is coated on the surface of the filter cloth tensioning roller, the bonding strength between the coating and the base body is high, the filter cloth tensioning roller surface is endowed with excellent wear resistance and corrosion resistance, and the online service life of the filter cloth tensioning roller is prolonged, and the water treatment cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of surface treatment engineering technology, and in particular to a method for preparing a wear-resistant and corrosion-resistant coating on the surface of a filter cloth tensioning roller. Background Technology

[0002] In industrial sludge belt dewatering machines for water treatment, filter cloth tensioning rollers are commonly used. Because wastewater contains sludge, sand, salts, and particulate matter, the rollers suffer severe wear and corrosion during filtration, affecting their service life. Currently, polytetrafluoroethylene (PTFE) is flame-sprayed onto the roller surface to improve its corrosion resistance. However, flame-spraying PTFE causes significant pollution and can be harmful to human health. Furthermore, PTFE has low hardness, poor wear resistance, and low bonding strength with the substrate. Typically, after six months of use, the PTFE coating ages and peels off over a large area, causing scratches on the filter cloth, affecting the filtration effect of industrial wastewater, leading to downtime or frequent replacements, and increasing water treatment costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a wear-resistant and corrosion-resistant coating on the surface of a filter cloth tensioning roller. This method overcomes the defects of traditional filter cloth tensioning roller surface treatment. By coating a ceramic coating, the coating and the substrate have high bonding strength. At the same time, a wear-resistant and waterproof film is prepared on the surface of the ceramic coating, giving the filter cloth tensioning roller surface excellent wear resistance and corrosion resistance, thereby improving the online service life of the filter cloth tensioning roller and reducing water treatment costs.

[0004] To solve the above-mentioned technical problems, the method for preparing the wear-resistant and corrosion-resistant coating on the surface of the filter cloth tensioning roller of the present invention includes the following steps:

[0005] Step 1: Clean the surface of the filter cloth tensioning roller to remove oil and debris, and dry it with compressed air; use 46# white corundum sand, pressure 0.6Mpa, sandblasting distance 250mm, sandblasting angle 90° to roughen the roller surface. After roughening, the roller surface is uniform and has no metallic luster.

[0006] Step 2: Place the roughened filter cloth tensioning roller on the tooling and fix it. Use plasma spraying equipment to spray the roller surface of the filter cloth tensioning roller. The thermal spraying material is ceramic powder with a particle size of 15-53μm, and the resulting coating thickness is 150-200μm.

[0007] Step 3: Use a 400# diamond grinding wheel and a 2000-mesh abrasive belt to grind and polish the ceramic coating on the roller surface of the filter cloth tensioning roller, respectively, to grind and polish the surface roughness to Ra0.1-0.2μm, so as to eliminate the original surface morphology of the coating, and the coating thickness is 100-150μm;

[0008] Step 4: Use 180# white corundum sand to roughen the coating on the roller surface of the filter cloth tensioning roller. After roughening, the surface roughness of the roller is Ra1-1.2μm, and a uniform roughness profile is obtained on the roller surface.

[0009] Step 5: Prepare a wear-resistant and waterproof film on the ceramic coating surface of the filter cloth tensioning roller. Use tetraethyl orthosilicate and n-octyltrimethoxysilane as raw materials, deionized water and anhydrous ethanol as solvents, and ammonia as catalyst. Mix and stir evenly at room temperature according to the ratio. Use a pneumatic atomizing spray gun with an outlet air pressure of 0.1-0.2 MPa to spray evenly on the roller surface of the filter cloth tensioning roller. After completion, let it stand for 24 hours or dry at 100-120℃ for 1-2 hours. Finally, a wear-resistant and waterproof film with a thickness of 1-3 μm is obtained on the roller coating surface.

[0010] Furthermore, the ceramic powder is any one of Al2O3-13%TiO2, Al2O3-20%TiO2, Al2O3-40%TiO2, Al2O3-50%TiO2, or Al2O3-Cr2O3.

[0011] Furthermore, the thermal spraying parameters of the plasma spraying equipment are: current 500-520A, voltage 60-65V, argon flow rate 30-35L / min, spraying distance 100-110mm, powder feeding rate 28-35g / min, and robotic arm spraying 5-6 times.

[0012] Furthermore, the tetraethyl orthosilicate and n-octyltrimethoxysilane are used as raw materials, deionized water and anhydrous ethanol are used as solvents, and ammonia is used as a catalyst. The mass ratio of tetraethyl orthosilicate: n-octyltrimethoxysilane: deionized water: anhydrous ethanol: ammonia is 10:5:5:50:1.

[0013] The method for preparing the wear-resistant and corrosion-resistant coating on the surface of the filter cloth tensioning roller of this invention adopts the above-mentioned technical solution. That is, the method first cleans the surface of the filter cloth tensioning roller and roughens the roller surface with 46# white corundum abrasive. Then, ceramic powder is sprayed onto the roller surface of the filter cloth tensioning roller using plasma spraying equipment to obtain a ceramic coating. The ceramic coating on the roller surface of the filter cloth tensioning roller is ground and polished with a 400# diamond grinding wheel and a 2000-mesh corundum abrasive belt, respectively, to eliminate the original surface morphology of the ceramic coating. Then, by roughening the roller surface ceramic coating, a uniform roughness is obtained. Finally, a 1-3 μm wear-resistant and waterproof film is prepared on the surface of the roller surface ceramic coating to further improve the corrosion resistance of the roller surface coating and obtain a filter cloth tensioning roller surface with a certain roughness and hardness. This method overcomes the defects of traditional filter cloth tensioning roller surface treatment. By coating with a ceramic coating, the coating has a high bonding strength with the substrate. At the same time, a wear-resistant and waterproof film is prepared on the surface of the ceramic coating, giving the filter cloth tensioning roller surface excellent wear resistance and corrosion resistance, thereby improving the online service life of the filter cloth tensioning roller and reducing water treatment costs. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram illustrating the preparation method of the wear-resistant and corrosion-resistant coating on the surface of the filter cloth tensioning roller of the present invention;

[0016] Figure 2 This is a cross-sectional metallographic diagram of the ceramic coating on the surface of the filter cloth tensioning roller. Detailed Implementation

[0017] Implementation, for example Figure 1 As shown, the method for preparing the wear-resistant and corrosion-resistant coating on the surface of the filter cloth tensioning roller of the present invention includes the following steps:

[0018] Step 1: Clean the surface of the filter cloth tensioning roller to remove oil and debris, and dry it with compressed air; use 46# white corundum sand, pressure 0.6Mpa, sandblasting distance 250mm, sandblasting angle 90° to roughen the roller surface. After roughening, the roller surface is uniform and has no metallic luster.

[0019] Step 2: Place the roughened filter cloth tensioning roller on the tooling and fix it. Use plasma spraying equipment to spray the roller surface of the filter cloth tensioning roller. The thermal spraying material is ceramic powder with a particle size of 15-53μm, and the resulting coating thickness is 150-200μm.

[0020] Step 3: Use a 400# diamond grinding wheel and a 2000-mesh abrasive belt to grind and polish the ceramic coating on the roller surface of the filter cloth tensioning roller, respectively, to grind and polish the surface roughness to Ra0.1-0.2μm, so as to eliminate the surface morphology of the original coating. The coating thickness is 100-150μm.

[0021] Step 4: Use 180# white corundum sand to roughen the coating on the roller surface of the filter cloth tensioning roller. After roughening, the surface roughness of the roller is Ra1-1.2μm, and a uniform roughness profile is obtained on the roller surface.

[0022] Step 5: Prepare a wear-resistant and waterproof film on the ceramic coating surface of the filter cloth tensioning roller. Use tetraethyl orthosilicate and n-octyltrimethoxysilane as raw materials, water and ethanol as solvents, and ammonia as catalyst. Mix and stir evenly at room temperature according to the ratio. Use a pneumatic atomizing spray gun with an air pressure of 0.1-0.2 MPa to spray evenly on the roller surface of the filter cloth tensioning roller. After completion, let it stand for 24 hours or dry it at 100-120℃ for 1-2 hours. Finally, a wear-resistant and waterproof film with a thickness of 1-3 μm is obtained on the roller surface.

[0023] Preferably, the ceramic powder is any one of Al2O3-13%TiO2, Al2O3-20%TiO2, Al2O3-40%TiO2, Al2O3-50%TiO2, or Al2O3-Cr2O3.

[0024] Preferably, the thermal spraying parameters of the plasma spraying equipment are: current 500-520A, voltage 60-65V, argon flow rate 30-35L / min, spraying distance 100-110mm, powder feeding rate 28-35g / min, and robotic arm spraying 5-6 times.

[0025] Preferably, the tetraethyl orthosilicate and n-octyltrimethoxysilane are used as raw materials, deionized water and anhydrous ethanol are used as solvents, and ammonia is used as a catalyst, with a mass ratio of tetraethyl orthosilicate: n-octyltrimethoxysilane: deionized water: anhydrous ethanol: ammonia = 10:5:5:50:1.

[0026] Alumina-based ceramic materials have excellent wear resistance and corrosion resistance, and have been widely used in the field of surface treatment engineering. Plasma spraying technology has a high flame temperature and can spray a variety of spraying materials, especially refractory materials with high melting points, such as refractory metals, ceramics, cermets and other special functional materials. It is widely used to improve the special functions of material surfaces.

[0027] This method uses plasma spraying equipment to prepare a ceramic coating on the surface of a filter cloth tensioning roller by spraying any one of the following ceramic powders: Al2O3-13%TiO2, Al2O3-20%TiO2, Al2O3-40%TiO2, Al2O3-50%TiO2, or Al2O3-Cr2O3, with a powder particle size of 15–53 μm. Figure 2 As shown, the substrate 3 of the filter cloth tensioning roller can be any of carbon steel, stainless steel, or low-alloy steel. The coating 2 has a high bonding strength with the substrate 3, giving the filter cloth tensioning roller surface excellent wear resistance and corrosion resistance, thus improving the online service life of the filter cloth tensioning roller. By controlling the spraying of alumina ceramic powder to a ceramic coating thickness of 150-200μm, and after grinding and polishing, the original surface morphology of the ceramic coating is eliminated. Then, the roller surface ceramic coating is roughened to obtain a uniform roughness. Finally, a 1-3μm wear-resistant and waterproof film is prepared on the surface of the roller surface ceramic coating to further improve the corrosion resistance of the roller surface coating. Coating performance: coating hardness HRC≥60, coating-substrate bonding strength≥50Mpa. This method is simple to implement, the processing is green and environmentally friendly, and the product service life is extended by more than 3 times. The prepared ceramic coating gives the filter cloth tensioning roller excellent wear resistance and corrosion resistance.

Claims

1. A method of preparing a wear resistant corrosion resistant coating for filter cloth take-up rolls characterized by It comprises the following steps: Step one, clean the surface of the filter cloth tensioning roller, remove the oil and dirt on the roller surface, and blow dry with compressed air; use 46# white corundum sand, pressure 0.6Mpa, sandblasting distance 250mm, sandblasting angle 90° to perform roughening treatment on the roller surface, and the roller surface is uniform and has no metal luster after roughening treatment; Step two, place the roughened filter cloth tensioning roller on the tooling and fix it, use plasma spraying equipment to spray the roller surface of the filter cloth tensioning roller, the thermal spraying material is ceramic powder, the particle size of the ceramic powder is 15-53μm, and the coating thickness is 150-200μm; Step three, use 400# diamond grinding wheel and 2000 mesh abrasive belt to grind and polish the ceramic coating on the surface of the filter cloth tensioning roller, the surface roughness is polished to Ra0.1-0.2μm, so as to eliminate the surface morphology of the original coating, and the coating thickness is 100-150μm; Step four, use 180# white corundum sand to roughen the roller surface coating of the filter cloth tensioning roller, the roughness of the roller surface is Ra1-1.2μm, and a uniform roughness profile is obtained on the roller surface; Step five, prepare a wear-resistant waterproof film on the surface of the ceramic coating of the filter cloth tensioning roller, use tetraethyl orthosilicate and n-octyl trimethoxysilane as raw materials, deionized water and anhydrous ethanol as solvents, and ammonia as catalyst, mix and stir uniformly at room temperature according to the proportion, use a pneumatic atomizing spray gun, the gas pressure of the spray gun is 0.1-0.2Mpa, spray uniformly on the roller surface, place for 24 hours after completion or dry at a temperature of 100-120℃ for 1-2h, and finally obtain a 1-3μm thick wear-resistant waterproof film on the surface of the roller coating; The ceramic powder is any one of Al2O3-13%TiO2, Al2O3-20%TiO2, Al2O3-40%TiO2, Al2O3-50%TiO2, and Al2O3-Cr2O3.

2. The method of claim 1 wherein: The thermal spraying parameters of the plasma spraying equipment are current 500-520A, voltage 60-65V, argon flow rate 30-35L / min, spraying distance 100-110mm, powder feeding rate 28-35g / min, and mechanical hand spraying 5-6 times.

3. The method of claim 1, wherein the method further comprises: The wear-resistant waterproof film on the surface of the ceramic coating is prepared by using tetraethyl orthosilicate and n-octyl trimethoxysilane as raw materials, deionized water and anhydrous ethanol as solvents, and ammonia as catalyst, and the mass ratio is tetraethyl orthosilicate:n-octyl trimethoxysilane:deionized water:anhydrous ethanol:ammonia=10:5:5:50:1.

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