CN111876772B - Hardware fitting repairing method based on cold spraying graphene-aluminum zinc powder composite material - Google Patents
Hardware fitting repairing method based on cold spraying graphene-aluminum zinc powder composite material Download PDFInfo
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- CN111876772B CN111876772B CN202010745275.3A CN202010745275A CN111876772B CN 111876772 B CN111876772 B CN 111876772B CN 202010745275 A CN202010745275 A CN 202010745275A CN 111876772 B CN111876772 B CN 111876772B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
Abstract
The invention relates to the technical field of high-voltage power transmission and transformation, and discloses a hardware fitting repairing method based on a cold spraying graphene-aluminum zinc powder composite material, which comprises the following steps: a1: derusting, roughening and cleaning the surface of the hardware; a2: spraying a graphene-aluminum zinc powder composite material on the surface of the treated hardware fitting; a3: coating a hole sealing agent containing self-repairing micro-nano capsule particles on the surface of the hardware tool treated in the step A2 to form a coating; a4: the coating is cured. The invention can effectively improve the corrosion resistance of the hardware fitting, has higher bonding strength with the hardware fitting, is not easy to break, and has better repairing and protecting effects on the hardware fitting.
Description
Technical Field
The invention relates to the technical field of high-voltage power transmission and transformation, in particular to a hardware fitting repairing method based on a cold spraying graphene-aluminum zinc powder composite material.
Background
The protection of the high-altitude electric power material is very important for guaranteeing the safety of power transmission. Human production activities cause an increase in atmospheric corrosive gases, including H2S、SO2Various corrosive gases including chlorides have great destructive effect on electric power metal materials (hardware fittings, towers and wires) with heights ranging from dozens to hundreds of meters, and metal sulfides and metal oxides can be generated on the surfaces of the electric power metal materials, so that intergranular cracks and brittle fractures of metal structures are caused.
The hardware has more structures such as corners, pores and the like and corresponds to a large specific surface area, so that two local corrosions, namely gap corrosion and contact corrosion, are easy to occur; under the action of tensile stress, the stress increases the damage degree of the surface protective layer, so that the crack propagation of the surface is increased, and a corrosive medium can more easily enter a zinc coating; meanwhile, the stress concentration generates a resident slip band with high dislocation density, which is easy to cause preferential corrosion of the anode; and the friction and collision caused by the micro motion of the hardware fittings can accelerate the corrosion; therefore, the corrosion rate of the hardware is generally higher than that of the transmission line and the iron tower, and the surface coating technology is an important means for repairing the damaged hardware.
At present, in the prior art, the hardware repair generally uses a composite material of graphene coated metal powder, and the composite material is still easy to corrode after the hardware repair, and has low bonding strength with the hardware and easy to break.
Disclosure of Invention
The invention aims to provide a hardware repair method based on a cold spraying graphene-aluminum zinc powder composite material, which can effectively improve the corrosion resistance of the hardware, has higher bonding strength with the hardware, is not easy to break, and has better repair and protection effects on the hardware.
The embodiment of the invention is realized by the following steps:
a hardware fitting repairing method based on a cold spraying graphene-aluminum zinc powder composite material comprises the following steps:
a1: derusting, roughening and cleaning the surface of the hardware;
a2: spraying a graphene-aluminum zinc powder composite material on the surface of the treated hardware fitting;
a3: coating a hole sealing agent containing self-repairing micro-nano capsule particles on the surface of the hardware tool treated in the step A2 to form a coating;
a4: the coating is cured.
The graphene-aluminum zinc powder composite material has the characteristic of high compactness and has a strong barrier effect in a corrosion process, so that the permeation of corrosive substances in the environment to the surface of a hardware fitting is reduced, and the corrosion resistance of a coating is improved; the graphene-aluminum zinc powder composite material has high strength and high modulus, including tensile resistance and wear resistance, and can improve the mechanical property of a coating; the method comprises the steps of firstly spraying a graphene-aluminum zinc powder composite material on the surface of a hardware fitting to form a protective layer, coating a hole sealing agent containing self-repairing micro-nano capsule particles outside the protective layer formed by the graphene-aluminum zinc powder composite material, enabling the hole sealing agent containing the self-repairing micro-nano capsule particles to be dissolved and seeped into pores between the protective layers formed by the graphene-aluminum zinc powder composite material and be dissolved and seeped into a composite coating with the protective layer formed by the graphene-aluminum zinc powder composite material, enabling the coating to have self-healing performance after corrosion and mechanical damage, and enabling self-repairing components to be broken and released and cured when an interface is broken, so that the breakage is inhibited; the composite coating has stronger corrosion resistance, can generate stronger bonding strength with hardware fittings and is not easy to break; has better repairing and protecting functions on hardware fittings.
Further, the preparation method of the graphene-aluminum zinc powder composite material in the step a2 includes the following steps:
b1: preparing aluminum-zinc alloy powder by an aerosol method;
b2: mixing graphene powder and aluminum-zinc alloy powder, and performing wet ball milling under the protection of liquid nitrogen to uniformly disperse the graphene powder in the aluminum-zinc alloy powder;
b3: and (4) screening out grinding balls and floating powder at normal temperature to prepare the graphene-aluminum zinc powder composite material.
Further, the aluminum-zinc alloy in the step B1 is ZnAl28、ZnAl15Or ZnAl5One of (1); the powder of the aluminum-zinc alloy powder is spherical or approximately spherical, and the particle size is 20-60 mu m.
Further, the graphene powder in the step B2 is prepared by an oxidation-reduction method, the weight ratio of the graphene is 0.1-1.5%, and the layer diameter-thickness ratio of the graphene sheet is 0.4-1.5.
Carrying out wet ball milling on graphene powder and aluminum-zinc alloy powder under the protection of liquid nitrogen to uniformly disperse the graphene powder in the aluminum-zinc alloy powder to prepare a graphene-aluminum-zinc powder composite material; under the condition of avoiding the oxidation of the graphene-aluminum zinc powder composite material, the composite material with higher compactness, higher strength and higher modulus performance can be prepared, so that the composite material has strong bonding strength and corrosion resistance to hardware fittings.
Further, the hole sealing agent containing the self-repairing micro-nano capsule particles in the step A3 is composed of the following components in percentage by weight: 57.5-88% of hole sealing agent, 10-40% of self-repairing micro-nano capsule and 2-3% of catalyst.
Further, the sealant is one of an epoxy resin type sealant, a polyurethane type sealant or an aluminum vinyl resin type sealant; the catalyst was a Grubbs metal catalyst.
Further, the preparation method of the sealant containing the self-repairing micro-nano capsule particles comprises the following steps:
c1: dissolving 7g of urea, 0.5g of resorcinol and 0.5g of ammonium chloride in 150ml of water, adding 100ml of 5% ethylene maleic anhydride copolymer solution, adjusting the pH to 3.5 by using 10% NaOH solution, and adding 60ml of dicyclopentadiene while stirring to obtain emulsion; adding 37% formaldehyde solution into the emulsion, heating to 50 ℃ and keeping for 2h, adding water for reaction for 4h, cooling to room temperature and separating out microcapsule slurry; diluting the microcapsule slurry with 200ml of water, washing with 500ml of water for 3 times each time, separating out capsules through vacuum filtration, and performing air drying treatment to obtain the self-repairing micro-nano capsules.
C2: and mixing the self-repairing micro-nano capsule, the catalyst and the hole sealing agent in proportion to prepare the hole sealing agent containing the self-repairing micro-nano capsule particles.
Further, a cold spraying method is adopted in the step a2, and the process parameters of the cold spraying are set as follows: the working pressure is 1-4 Mpa, the gas temperature is 300-700 ℃, the distance between the spray gun and the hardware fitting is 10-40 mm, the moving speed of the spray gun relative to a sample is 20-80 mm/s, and the powder conveying amount is 0.5-1.5 g/s.
Further, the coating in the step A4 is cured for 24-72 hours at room temperature, or cured for 6-24 hours at 200 ℃.
The hole sealing agent containing the self-repairing micro-nano capsule particles with better quality is prepared so as to remarkably exert the self-healing performance of the hole sealing agent.
Has the advantages that:
according to the invention, the graphene-aluminum zinc powder composite material is cold sprayed on the surface of the hardware fitting, the graphene-aluminum zinc powder composite material is firstly sprayed on the surface of the hardware fitting, and then the hole sealing agent containing the self-repairing micro-nano capsule particles is sprayed, so that the hardware fitting not only has stronger corrosion resistance, but also can generate stronger bonding strength with the hardware fitting and is not easy to break; has better repairing and protecting functions on hardware fittings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The hardware repair method based on the cold spraying graphene-aluminum zinc powder composite material provided by the embodiment of the invention is specifically described below.
Example 1
The embodiment provides a hardware repair method based on a cold spraying graphene-aluminum zinc powder composite material, which comprises the following steps: derusting, roughening and cleaning the surface of the hardware; cold spraying a graphene-aluminum zinc powder composite material on the surface of the treated hardware fitting; the cold spraying process parameters are as follows: the working pressure is 1Mpa, the gas temperature is 700 ℃, the distance between the spray gun and the hardware is 15mm, the moving speed of the spray gun relative to the sample is 30mm/s, and the powder feeding amount is 0.5 g/s; the graphene-aluminum-zinc powder composite material is ZnAl with the particle size of 20 mu m prepared by an aerosol method28The powder and graphene powder prepared by an oxidation-reduction method account for 0.1% by weight, and the graphene powder with the graphene sheet thickness ratio of 0.4 is prepared by a wet ball milling method under the protection of liquid nitrogen; coating a hole sealing agent containing self-repairing micro-nano capsule particles on the surface of the processed hardware fitting to form a coating; curing is carried out for 72h under the condition of room temperature, so that the coating is cured.
The hole sealing agent containing the self-repairing micro-nano capsule particles comprises the following components in percentage by weight: 88% of hole sealing agent, 10% of self-repairing micro-nano capsule and 2% of catalyst.
The preparation method of the hole sealing agent of the self-repairing micro-nano capsule particles comprises the following steps: dissolving 7g of urea, 0.5g of resorcinol and 0.5g of ammonium chloride in 150ml of water, adding 100ml of 5% ethylene maleic anhydride copolymer solution, adjusting the pH to 3.5 by using 10% NaOH solution, and adding 60ml of dicyclopentadiene while stirring to obtain emulsion; adding 37% formaldehyde solution into the emulsion, heating to 50 ℃ and keeping for 2h, adding water for reaction for 4h, cooling to room temperature and separating out microcapsule slurry; diluting the microcapsule slurry with 200ml of water, washing with 500ml of water for 3 times each time, separating out capsules by vacuum filtration, and performing air drying treatment to obtain self-repairing micro-nano capsules; and mixing the self-repairing micro-nano capsule, the catalyst and the hole sealing agent in proportion to prepare the hole sealing agent containing the self-repairing micro-nano capsule particles.
The hardware prepared by the hardware repairing method is marked as A.
Example 2
The embodiment provides a hardware repair method based on a cold spraying graphene-aluminum zinc powder composite material, which comprises the following steps: derusting, roughening and cleaning the surface of the hardware; cold spraying a graphene-aluminum zinc powder composite material on the surface of the treated hardware fitting; the cold spraying process parameters are as follows: the working pressure is 4Mpa, the gas temperature is 300 ℃, the distance between the spray gun and the hardware fitting is 10mm, the moving speed of the spray gun relative to the sample is 20mm/s, and the powder feeding amount is 0.9 g/s; the graphene-aluminum-zinc powder composite material is ZnAl with the grain diameter of 30 mu m prepared by an aerosol method15The powder and graphene powder prepared by an oxidation-reduction method account for 0.7% by weight, and the graphene powder with the graphene sheet thickness ratio of 0.9 is prepared by a wet ball milling method under the protection of liquid nitrogen; coating a hole sealing agent containing self-repairing micro-nano capsule particles on the surface of the processed hardware fitting to form a coating; curing at 200 ℃ for 24h to cure the coating.
The hole sealing agent containing the self-repairing micro-nano capsule particles comprises the following components in percentage by weight: 77% of hole sealing agent, 20% of self-repairing micro-nano capsule and 3% of catalyst.
The preparation method of the hole sealing agent of the self-repairing micro-nano capsule particles is the same as that in the embodiment 1.
The hardware prepared by the hardware repairing method is marked as B.
Example 3
The embodiment provides a hardware repair method based on a cold spraying graphene-aluminum zinc powder composite material, which comprises the following steps: derusting, roughening and cleaning the surface of the hardware; cold spraying a graphene-aluminum zinc powder composite material on the surface of the treated hardware fitting; the cold spraying process parameters are as follows: the working pressure is 2Mpa, the gas temperature is 500 ℃, the distance between the spray gun and the hardware is 25mm, the moving speed of the spray gun relative to the sample is 50mm/s, and the powder feeding amount is 1.5 g/s; the graphene-aluminum-zinc powder composite material is ZnAl with the grain diameter of 40 mu m prepared by an aerosol method5The powder and graphene powder prepared by an oxidation-reduction method account for 0.5% by weight, and the graphene powder with the graphene sheet thickness ratio of 0.8 is prepared by a wet ball milling method under the protection of liquid nitrogen; coating a hole sealing agent containing self-repairing micro-nano capsule particles on the surface of the processed hardware fitting to form a coating; curing at 200 ℃ for 6h to cure the coating.
The hole sealing agent containing the self-repairing micro-nano capsule particles comprises the following components in percentage by weight: 57.5% of hole sealing agent, 40% of self-repairing micro-nano capsule and 2.5% of catalyst.
The preparation method of the hole sealing agent of the self-repairing micro-nano capsule particles is the same as that in the embodiment 1.
The hardware prepared by the hardware repairing method is marked as C.
Comparative example 1
The comparative example provides a hardware repair method, which comprises the following steps: derusting, roughening and cleaning the surface of the hardware; cold spraying a graphene-aluminum zinc composite material on the surface of the treated hardware fitting; the cold spraying process parameters are as follows: the working pressure is 2Mpa, the gas temperature is 500 ℃, the distance between the spray gun and the hardware is 25mm, the moving speed of the spray gun relative to the sample is 50mm/s, and the powder feeding amount is 1.5 g/s; the graphene-aluminum-zinc composite material is ZnAl with the grain diameter of 40 mu m prepared by an aerosol method5Putting the powder into a graphene oxide aqueous solution, stirring, reducing the reacted graphene oxide, and self-assembling the graphene oxide on ZnAl5Drying the powder surface to obtain a graphene-aluminum zinc composite material of graphene coated aluminum powder; coating self-repairing micro-element on surface of treated hardwareA hole sealing agent of the nanocapsule particles forms a coating; curing at 200 ℃ for 6h to cure the coating.
The hole sealing agent containing the self-repairing micro-nano capsule particles comprises the following components in percentage by weight: 57.5% of hole sealing agent, 40% of self-repairing micro-nano capsule and 2.5% of catalyst.
The preparation method of the hole sealing agent of the self-repairing micro-nano capsule particles is the same as that in the embodiment 1.
The hardware prepared by the hardware repairing method is marked as M1.
Comparative example 2
The comparative example provides a hardware repair method, which comprises the following steps: derusting, roughening and cleaning the surface of the hardware; coating a hole sealing agent containing self-repairing micro-nano capsule particles on the surface of the processed hardware fitting; then, cold spraying a graphene-aluminum zinc powder composite material on the surface of the treated hardware fitting; the cold spraying process parameters are as follows: the working pressure is 2Mpa, the gas temperature is 500 ℃, the distance between the spray gun and the hardware is 25mm, the moving speed of the spray gun relative to the sample is 50mm/s, and the powder feeding amount is 1.5 g/s; the graphene-aluminum-zinc powder composite material is ZnAl with the grain diameter of 40 mu m prepared by an aerosol method5The powder and graphene powder prepared by an oxidation-reduction method account for 0.5% by weight, and the graphene powder with the graphene sheet thickness ratio of 0.8 is prepared by a wet ball milling method under the protection of liquid nitrogen; curing at 200 ℃ for 6h to cure the coating.
The hole sealing agent containing the self-repairing micro-nano capsule particles comprises the following components in percentage by weight: 57.5% of hole sealing agent, 40% of self-repairing micro-nano capsule and 2.5% of catalyst.
The preparation method of the hole sealing agent of the self-repairing micro-nano capsule particles is the same as that in the embodiment 1.
The hardware prepared by the hardware repairing method is marked as M2.
Comparative example 3
The comparative example provides a hardware repair method, which comprises the following steps: derusting, roughening and cleaning the surface of the hardware; cold spraying a graphene-aluminum zinc powder composite material on the surface of the treated hardware fitting; cold spray process parametersThe method comprises the following steps: the working pressure is 2Mpa, the gas temperature is 500 ℃, the distance between the spray gun and the hardware is 25mm, the moving speed of the spray gun relative to the sample is 50mm/s, and the powder feeding amount is 1.5 g/s; the graphene-aluminum-zinc powder composite material is ZnAl with the grain diameter of 40 mu m prepared by an aerosol method5The powder and graphene powder prepared by an oxidation-reduction method account for 0.5% by weight, and the graphene powder with the graphene sheet thickness ratio of 0.8 is prepared by a wet ball milling method under the protection of liquid nitrogen; curing at 200 ℃ for 6h to cure the coating.
The hardware prepared by the hardware repairing method is marked as M3.
Experimental example 1
Soaking the hardware fitting samples A-C prepared in examples 1-3 and the hardware fitting samples M1-M2 prepared in comparative examples 1-2 in a salt spray box for carrying out a salt spray test; samples a-C and samples M1-M2 were both rectangular samples of 90mm by 120mm by 1 mm; NaHSO in salt solution3The concentration is 1.8g/L, and the Ph is 2; before the experiment, the edges of the samples A-C and the samples M1-M2 are sealed by epoxy resin, so as to prevent the carbon steel matrix from interfering with the coating; soaking in a salt spray box for 24h, 72h, 168h, 336h and 504h respectively; weighing the samples A-C and the samples M1-M2 before soaking, cleaning and drying the samples by using an organic solvent after soaking for a corresponding time, weighing the samples, calculating the weight loss of the samples, calculating the corrosion efficiency according to a formula, and performing three groups of parallel experiments on each sample to calculate the average corrosion efficiency; the calculation formula is as follows:
in the formula:
v-sample corrosion rate, μm/a;
Δ W-weight loss of sample, g;
rho-metal material density, g.cm-3；
4-area of sample, cm2；
t-test period, h.
The calculated average corrosion efficiency of each sample is shown in table 1.
TABLE 1 average Corrosion efficiency (. mu.m/a)
As can be seen from Table 1, the corrosion efficiency of the hardware samples repaired in examples 1-3 is not increased and is reduced with the increase of time; the graphene-aluminum-zinc composite material with aluminum powder coated by graphene is used in the comparative example 1, the corrosion efficiency of the sample is far greater than that of the hardware sample prepared by repairing in the examples 1-3, and the corrosion efficiency is gradually increased along with the increase of time; in the comparative example 2, when the hardware is repaired, the hole sealing agent containing the self-repairing micro-nano capsule particles is coated firstly, and then the graphene-aluminum zinc powder composite material is sprayed in a cooling mode, so that the corrosion efficiency of the sample is far greater than that of the hardware sample prepared by repairing in the examples 1-3, and the corrosion efficiency is gradually increased along with the increase of time; in the comparative example 3, when the hardware is repaired, the graphene-aluminum zinc powder composite material is only subjected to cold spraying, so that the corrosion efficiency of the sample is far greater than that of the hardware sample prepared by repairing in the examples 1-3, and the corrosion efficiency is gradually increased along with the increase of time; the composite coating prepared by the hardware repair method based on the cold spraying graphene-aluminum zinc composite material enables the hardware to have stronger corrosion resistance and has better repair and protection effects on the hardware.
Experimental example 2
Testing the bonding strength of the coating by a tensile method on the hardware samples A to C prepared in the examples 1 to 3 and the hardware sample M prepared in the comparative example; applying opposite forces to the hardware fitting substrate and the coating of the samples A-C and the sample M for stretching, recording the magnitude of the tensile force when the coating is broken, and obtaining an experimental result through calculation as shown in table 2; the calculation formula is as follows:
b＝F/A
in the formula:
b-bond strength, Mpa;
f-maximum tensile load, N;
a-bonding area, mm.
The average bond strengths of the coatings calculated for each sample are shown in table 2.
TABLE 2 average bond Strength (MPa)
As can be seen from Table 2, the coating bonding strength of the hardware fitting samples repaired in the embodiments 1-3 is high; the graphene-aluminum-zinc composite material with aluminum powder coated by graphene is used in the comparative example 1, and the coating bonding strength of the sample is low; in the comparative example 2, when the hardware fitting is repaired, the hole sealing agent containing the self-repairing micro-nano capsule particles is coated firstly, and then the graphene-aluminum zinc powder composite material is sprayed in a cooling mode, so that the coating bonding strength of the sample is low; in the comparative example 3, when the hardware is repaired, the graphene-aluminum zinc powder composite material is only subjected to cold spraying, so that the coating bonding strength of the sample is lower; when the composite coating prepared by the hardware repair method based on the cold spraying graphene-aluminum zinc composite material is subjected to interface fracture, the self-repairing component is cracked, released and cured, so that the fracture is inhibited, and the composite coating and the hardware have stronger bonding strength.
In conclusion, the hardware repair method based on the cold spraying graphene-aluminum zinc powder composite material has strong corrosion resistance, can generate strong bonding strength with the hardware, and is not easy to break; therefore, the method has better repairing and protecting effects on the hardware.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A hardware fitting repairing method based on a cold spraying graphene-aluminum zinc powder composite material is characterized by comprising the following steps:
a1: derusting, roughening and cleaning the surface of the hardware;
a2: spraying a graphene-aluminum zinc powder composite material on the surface of the treated hardware fitting; the preparation method of the graphene-aluminum zinc powder composite material comprises the following steps:
b1: preparing aluminum-zinc alloy powder by an aerosol method;
b2: mixing graphene powder and aluminum-zinc alloy powder, and performing wet ball milling under the protection of liquid nitrogen to uniformly disperse the graphene powder in the aluminum-zinc alloy powder;
b3: sieving to remove grinding balls and floating powder at normal temperature, and preparing the graphene-aluminum zinc powder composite material;
a3: coating a hole sealing agent containing self-repairing micro-nano capsule particles on the surface of the hardware tool treated in the step A2 to form a coating; the hole sealing agent containing the self-repairing micro-nano capsule particles comprises the following components in percentage by weight: 57.5-88% of hole sealing agent, 10-40% of self-repairing micro-nano capsule and 2-3% of catalyst;
the preparation method of the sealant containing the self-repairing micro-nano capsule particles comprises the following steps:
c1: dissolving 7g of urea, 0.5g of resorcinol and 0.5g of ammonium chloride in 150ml of water, adding 100ml of 5% ethylene maleic anhydride copolymer solution, adjusting the pH to 3.5 by using 10% NaOH solution, and adding 60ml of dicyclopentadiene while stirring to obtain emulsion; adding 37% formaldehyde solution into the emulsion, heating to 50 ℃ and keeping for 2h, adding water for reaction for 4h, cooling to room temperature and separating out microcapsule slurry; diluting the microcapsule slurry with 200ml of water, washing with 500ml of water for 3 times each time, separating out capsules by vacuum filtration, and performing air drying treatment to obtain self-repairing micro-nano capsules;
c2: mixing the self-repairing micro-nano capsule, a catalyst and a hole sealing agent in proportion to prepare the hole sealing agent containing the self-repairing micro-nano capsule particles;
a4: the coating is cured.
2. Cold spray graphene-aluminum zinc powder based composite material according to claim 1The gold tool repairing method is characterized in that the aluminum-zinc alloy in the step B1 is ZnAl28、ZnAl15Or ZnAl5One of (1); the powder of the aluminum-zinc alloy powder is spherical or approximately spherical, and the particle size is 20-60 mu m.
3. The hardware repairing method based on the cold spraying graphene-aluminum zinc powder composite material of claim 1, wherein the graphene powder in the step B2 is prepared by an oxidation-reduction method, the weight ratio of graphene is 0.1% -1.5%, and the layer thickness ratio of graphene is 0.4-1.5.
4. The hardware repair method based on the cold spraying graphene-aluminum zinc powder composite material of claim 1, wherein the sealant is one of an epoxy resin type sealant, a polyurethane type sealant or an aluminum vinyl resin type sealant; the catalyst was a Grubbs metal catalyst.
5. The hardware repair method based on the cold spraying graphene-aluminum zinc powder composite material according to claim 1, wherein a cold spraying method is adopted in the step A2, and the process parameters of the cold spraying are set as follows: the working pressure is 1-4 Mpa, the gas temperature is 300-700 ℃, the distance between the spray gun and the hardware fitting is 10-40 mm, the moving speed of the spray gun relative to a sample is 20-80 mm/s, and the powder conveying amount is 0.5-1.5 g/s.
6. The hardware repairing method based on the cold spraying graphene-aluminum zinc powder composite material of claim 1, wherein the coating in the step A4 is cured for 24-72 hours at room temperature, or cured for 6-24 hours at 180-220 ℃.
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| CN115055677B (en) * | 2022-08-17 | 2022-11-01 | 潍坊谷合传动技术有限公司 | Method for preparing zinc-aluminum corrosion-resistant coating by cold spraying |
| CN115055687B (en) * | 2022-08-18 | 2023-03-17 | 湖南晨智纳米材料科技有限公司 | Production method of zinc-aluminum alloy-graphene composite powder material |
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| CN107034426A (en) * | 2017-04-12 | 2017-08-11 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of corrosion-resistant compound plating technology of transmission line hardware |
| CN107955932A (en) * | 2017-11-30 | 2018-04-24 | 武汉劲野科技有限公司 | Alumin(i)um zinc alloy composite graphite alkene anti-corrosion of metal treatment process |
| CN108579627A (en) * | 2018-04-23 | 2018-09-28 | 吉林大学 | For naval vessel seawater pipe anticorrosion selfreparing micro-nano capsule and preparation method |
| CN110144579A (en) * | 2019-04-19 | 2019-08-20 | 广东工业大学 | A kind of Zinc Based Comples Coatings and its preparation method and application with quick repair ability |
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| CN107034426A (en) * | 2017-04-12 | 2017-08-11 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of corrosion-resistant compound plating technology of transmission line hardware |
| CN107955932A (en) * | 2017-11-30 | 2018-04-24 | 武汉劲野科技有限公司 | Alumin(i)um zinc alloy composite graphite alkene anti-corrosion of metal treatment process |
| CN108579627A (en) * | 2018-04-23 | 2018-09-28 | 吉林大学 | For naval vessel seawater pipe anticorrosion selfreparing micro-nano capsule and preparation method |
| CN110144579A (en) * | 2019-04-19 | 2019-08-20 | 广东工业大学 | A kind of Zinc Based Comples Coatings and its preparation method and application with quick repair ability |
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