CN112501610A - Treatment process for improving corrosion resistance of fertilizing mechanism part in contact with corrosive medium - Google Patents
Treatment process for improving corrosion resistance of fertilizing mechanism part in contact with corrosive medium Download PDFInfo
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Abstract
The invention discloses a treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium, which relates to the technical field of agricultural machinery, and specifically comprises the following steps: 1) carrying out liquid-phase ultrasonic stripping on the boron nitride powder after high-temperature calcination to obtain boron nitride nanosheets; 2) pretreating the boron nitride nanosheets; 3) preparing a silicon carbide/boron nitride compound by using the pretreated boron nitride nanosheets and the silicon carbide nanowires; 4) adding the silicon carbide/boron nitride compound into the nickel-based alloy powder, uniformly mixing to obtain a cladding material, and carrying out laser cladding treatment. According to the invention, the prepared silicon carbide/boron nitride compound is introduced into the cladding material, and the laser cladding treatment is carried out, so that the barrier effect of the cladding layer on the diffusion path of a corrosive medium can be improved, and the technical effect of high-efficiency corrosion prevention of the fertilizing mechanism is realized.
Description
Technical Field
The invention belongs to the technical field of agricultural machinery, and particularly relates to a treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium.
Background
The fertilizer distributor is the agricultural machine that can generally use among the modern agriculture, and it can replace original artifical fertigation, when liberating the labour, has also promoted the efficiency of fertilization, has shortened the time of fertilization. Wherein, the fertilizer box of fertilizer distributor, medical kit etc. and the component that corrodes the medium contact, are corroded by fertilizer very easily, and then appear serious rust phenomenon, have shortened the life of fertilizer distributor. Therefore, in practical application, the metal components in the fertilizer applicator, which are in contact with corrosive media, need to be subjected to corrosion prevention treatment.
In order to improve the corrosion resistance of the members of the fertilizer applicator, the members are subjected to surface treatment by various methods so as to achieve the purpose of improving the corrosion resistance of the members. The laser cladding is used as a new surface modification technology, has high economic effect, can prepare a high-performance alloy surface in a metal base material without influencing the performance of a matrix, reduces the cost, saves metal materials and is widely applied. Therefore, a cladding layer is formed on the surface of the fertilizing mechanism part by adopting a laser cladding technology, and the corrosion resistance of the member can be effectively improved. At present, the main cladding materials are nickel-based alloy powder which is selected from multiple materials, has excellent comprehensive performance, corrosion resistance, oxidation resistance, heat resistance, low-stress abrasive wear resistance, good impact toughness, low melting point, wide solid-liquid phase temperature range, strong wetting capacity on various matrixes and simple and convenient operation. Therefore, in the prior art, nickel-based alloy powder is used as a cladding material, and the surface of the fertilizing mechanism is treated by adopting a laser cladding technology, so that a component with corrosion resistance is obtained; however, when the cladding material is directly selected from the nickel-based alloy powder to perform cladding treatment, the formed cladding layer has poor compactness, and porous gaps and microcracks are easy to appear in the coating, so that the cladding layer has poor effect of blocking the diffusion of corrosive media, and cannot achieve the effect of long-term efficient corrosion prevention.
Disclosure of Invention
Aiming at the existing problems, the invention provides a treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium, and the treatment process improves the barrier effect of a cladding layer on a diffusion path of the corrosive medium by introducing a prepared silicon carbide/boron nitride compound into a cladding material, thereby realizing the technical effect of high-efficiency corrosion resistance of the fertilizing mechanism part.
The invention is realized by the following technical scheme:
a treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium comprises the following specific process steps:
1) weighing a proper amount of boron nitride powder (purchased from Shanghai Aladdin sublimation science and technology Co., Ltd., belonging to H-type boron nitride) and placing the boron nitride powder into a crucible, placing the crucible into a muffle furnace, and carrying out heat preservation treatment at the temperature of 850-; according to the invention, through carrying out heat treatment on the boron nitride powder, the boron nitride sheet layer can expand from the axial direction, the interlayer spacing is greatly increased, the subsequent liquid-phase ultrasonic stripping process is greatly facilitated, and the thermal oxidation treatment carried out in the air atmosphere can more efficiently make defects on the boron nitride surface, increase the number of oxygen-containing groups and provide good reaction sites for the subsequent grafting of a silane coupling agent; according to the mass volume ratio of boron nitride to ethanolamine-water mixed solution of 1:200-230g/mL, dispersing boron nitride powder cooled to room temperature into 70-80% ethanolamine-water mixed solution, performing ultrasonic treatment for 4-5h at 50-55 ℃ by using 400W of 300-4000W, then performing centrifugal treatment for 30-40min at 3000-4000r/min, filtering supernatant at reduced pressure, repeatedly washing the obtained filter cake with absolute ethyl alcohol, and drying to obtain boron nitride nanosheets; according to the invention, ethanolamine-water mixed solution is used as a dispersing solvent, boron nitride is used as a raw material, an ultrasonic auxiliary liquid stripping method is adopted to prepare boron nitride nanosheets, the boron nitride nanosheets are introduced into the nickel-based alloy powder coating, and the boron nitride nanosheets are stacked layer by layer in the alloy powder coating to form a labyrinth effect, so that the boron nitride nanosheets have a good blocking effect, and can effectively block a diffusion path of a corrosion medium in the coating, thereby improving the acid-base corrosion resistance of the coating;
2) according to the volume ratio of titanium tetrachloride to distilled water of 2-3:120, firstly measuring a proper amount of titanium tetrachloride, placing the titanium tetrachloride in a container, dropwise adding a proper amount of distilled water under stirring of 100-150r/min, stirring for 1-2h, adjusting the pH to 6-6.5 by using a 4-4.5mol/L sodium hydroxide solution, then adding boron nitride nanosheets according to the mass-volume ratio of the boron nitride nanosheets to the distilled water of 1:50-55g/mL, continuously stirring for 30-40min at 150r/min, transferring to a hydrothermal kettle, heating and reacting for 12-15h at 185 ℃ of 180-55 ℃, after the reaction solution is cooled to room temperature, carrying out reduced pressure filtration, repeatedly washing a filter cake by using deionized water, and drying to obtain pretreated boron nitride nanosheets; when the boron nitride nanosheets are agglomerated, the aggregate of the nanosheets is increased, the distribution uniformity in the nickel-based alloy powder coating is reduced, the defects such as cracks and holes in the coating are increased, and the barrier effect on a corrosion medium is weakened, so that in the invention, the boron nitride nanosheets are used as a carrier, and a titanium dioxide coating layer is deposited on the surface of the boron nitride nanosheets by a hydrothermal synthesis method, and the formation of the titanium dioxide coating layer increases the density of the boron nitride nanosheets, so that the density of the boron nitride nanosheets is increased, the density difference between the boron nitride nanosheets and the nickel-based alloy powder is reduced, the dispersion uniformity of the boron nitride nanosheets in the nickel-based alloy powder is improved, and the phenomenon that the barrier effect of the boron nitride nanosheets on the;
3) dispersing the weighed pretreated boron nitride nanosheets into an ethanol solution with the mass fraction of 70-80% according to the mass-volume ratio of 1:80-100g/mL, adding a silane coupling agent KH560 according to the volume ratio of the silane coupling agent KH560 to the ethanol solution of 1:180-, pouring the obtained dispersion liquid into a hollow polytetrafluoroethylene mold for vacuum filtration, after the vacuum filtration is finished, preventing a filter cake from being placed in a blast drying oven, drying for 20-25h at the temperature of 60-70 ℃, and grinding to obtain a silicon carbide/boron nitride compound with the particle size of 50-80 mu m; according to the invention, a vacuum filtration assisted self-assembly method is adopted, the pretreated boron nitride nanosheets and the silicon carbide nanowires are tightly intertwined with each other to be woven into a network structure, the added silane coupling agent is used as an adhesive, so that the intertwining between the pretreated boron nitride nanosheets and the silicon carbide nanowires can be accelerated, the formation of the network structure is promoted, and the mixed liquid can be stirred for a short time and subjected to ultrasonic treatment to complete the braiding forming of the network structure;
4) weighing a proper amount of Ni60 nickel-based alloy powder, adding a silicon carbide/boron nitride compound into the alloy powder according to the mass of 3.5-5.5% of Ni60 nickel-based alloy powder, uniformly mixing to obtain a cladding material, cleaning the surface of a fertilizer applicator component, drying the cladding material at constant temperature of 100 ℃ and 110 ℃ for 6-8h, adjusting laser cladding process parameters, performing laser cladding treatment on the fertilizer applicator component to form a coating with the thickness of 0.5-1.0mm, finally cleaning the fertilizer applicator component subjected to laser cladding with alcohol, polishing, and polishing the polishing paste to finish the treatment process; according to the invention, the silicon carbide/boron nitride compound is introduced into the cladding layer, the multilayer network structure is stacked to form a three-dimensional skeleton structure, the constructed three-dimensional skeleton structure can be used as a support body to be fixed in the cladding layer, and the boron nitride nanosheets in the skeleton structure are embedded and fixed in the cladding layer along with the skeleton structure and are not easy to slip, so that the boron nitride nanosheets can be prevented from falling off in the coating, corrosion pits are avoided from appearing on the surface of the coating, and the surface of a member of the fertilizer applicator can be favorably subjected to efficient corrosion prevention effect.
Further, the particle size of the Ni60 nickel-based alloy powder is 100-200 meshes, and the chemical components are as follows: 0.5% of C, 3.0% of B, 4.5% of Si, 18% of Cr, 15% of Fe and the balance of Ni.
Further, the laser cladding process parameters are as follows: the laser power is 1200-1600W, the diameter of a light spot is phi 2-4mm, the moving speed of the light spot is 10-15mm/s, the lap joint rate is 28-30%, and argon gas with the volume of 13-17L/min is blown laterally to protect a cladding area in the laser cladding process.
Compared with the prior art, the invention has the following advantages:
aiming at the defects that the compactness of a conventional nickel-based alloy powder cladding layer is poor, and multiple pores and microcracks are easy to appear in the coating, so that the effect of obstructing the diffusion of a corrosive medium of the cladding layer is poor, and the long-term high-efficiency anticorrosion effect cannot be achieved, in the invention, boron nitride nanosheets are introduced into the cladding layer, and the embedding fastness of the boron nitride nanosheets in the cladding layer is improved, so that the boron nitride nanosheets are not easy to slip, and the falling of the boron nitride nanosheets in the coating layer is reduced, thereby realizing the improvement of the anticorrosion effect of the cladding layer; the silicon carbide/boron nitride compound is introduced into the cladding layer, the boron nitride nanosheets in the silicon carbide/boron nitride compound network structure form a labyrinth effect by overlapping layer by layer, the silicon carbide/boron nitride compound has a good blocking effect, can effectively block a diffusion path of a corrosion medium in the coating layer, thereby improving the acid-base corrosion resistance of the coating layer, and in order to prevent the boron nitride nanosheets from slipping in the coating layer, the silicon carbide/boron nitride compound is formed by self-assembling the boron nitride nanosheets and the silicon carbide nanowires, the network structure formed by the silicon carbide nanowires forms a three-dimensional framework structure by stacking, the boron nitride nanosheets are introduced into the framework structure formed by the silicon carbide nanowires, so that the effect of preventing the boron nitride nanosheets from slipping can be achieved, and the boron nitride nanosheets can be well embedded in the cladding layer, and the coating is not easy to fall off, and corrosion pits can be avoided on the surface of the coating, so that the cladding layer has a good corrosion prevention effect, and the high-efficiency corrosion prevention performance of the fertilizing mechanism is facilitated.
Detailed Description
The present invention will be further described with reference to specific embodiments.
Example 1
A treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium comprises the following specific process steps:
1) weighing a proper amount of boron nitride powder, placing the crucible in a muffle furnace, carrying out heat preservation treatment for 2h at 850 ℃, dispersing the boron nitride powder cooled to room temperature in ethanolamine-water mixed liquor with the volume fraction of 70% according to the mass-volume ratio of the boron nitride to the ethanolamine-water mixed liquor of 1:200g/mL, carrying out ultrasonic treatment for 4h at 50 ℃ by 300W, then carrying out centrifugal treatment for 30min at 3000r/min, carrying out reduced pressure filtration on supernatant liquid, repeatedly washing an obtained filter cake with absolute ethyl alcohol, and drying to obtain boron nitride nanosheets;
2) firstly, weighing a proper amount of titanium tetrachloride and distilled water according to the volume ratio of the titanium tetrachloride to the distilled water of 2:120, adding a proper amount of distilled water dropwise under stirring at 100r/min, stirring for 1h, adjusting the pH to 6 by using a 4mol/L sodium hydroxide solution, then adding boron nitride nanosheets according to the mass volume ratio of the boron nitride nanosheets to the distilled water of 1:50g/mL, continuously stirring for 30min at 100r/min, transferring to a hydrothermal kettle, heating and reacting at 180 ℃ for 12h, cooling the reaction liquid to room temperature, filtering under reduced pressure, repeatedly washing a filter cake by using deionized water, and drying to obtain pretreated boron nitride nanosheets;
3) dispersing the weighed pretreated boron nitride nanosheets into an ethanol solution with the mass fraction of 70% according to the mass-to-volume ratio of 1:80g/mL, adding the silane coupling agent KH560 according to the volume ratio of the silane coupling agent KH560 to the ethanol solution of 1:180, heating the mixed solution in water bath to 60 ℃, stirring and refluxing for 8h at 400r/min, then adding the weighed silicon carbide nanowires into the cooled mixed solution according to the mass ratio of the silicon carbide nanowires to the pretreated boron nitride nanosheets of 1:8, stirring at 400r/min for 1h, ultrasonically dispersing at 200W for 1h, pouring the obtained dispersion into a hollow polytetrafluoroethylene mold, vacuum filtering, preventing the filter cake from being placed in a forced air drying oven after the vacuum filtration is finished, drying at 60 ℃ for 20h, and grinding to obtain a silicon carbide/boron nitride compound with the particle size of 50 mu m;
4) weighing a proper amount of Ni60 nickel-based alloy powder, adding a silicon carbide/boron nitride compound into the alloy powder according to the mass of 3.5 percent of Ni60 nickel-based alloy powder, uniformly mixing to obtain a cladding material, cleaning the surface of a component of the fertilizer applicator, drying the cladding material at constant temperature of 100 ℃ for 6 hours, adjusting laser cladding technological parameters, carrying out laser cladding treatment on the component of the fertilizer applicator to form a coating with the thickness of 0.5mm, finally cleaning the component of the fertilizer applicator after laser cladding with alcohol, then grinding, and polishing a polishing paste to finish the treatment process.
Further, the particle size of the Ni60 nickel-based alloy powder is 100 meshes, and the chemical components are as follows: 0.5% of C, 3.0% of B, 4.5% of Si, 18% of Cr, 15% of Fe and the balance of Ni.
Further, the laser cladding process parameters are as follows: the laser power is 1200W, the diameter of a light spot is phi 2mm, the moving speed of the light spot is 10mm/s, the lap joint rate is 28 percent, and the side blowing of 13L/min argon is adopted to protect a cladding area in the laser cladding process.
Example 2
A treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium comprises the following specific process steps:
1) weighing a proper amount of boron nitride powder, placing the crucible in a muffle furnace, carrying out heat preservation treatment for 2.5h at 870 ℃, dispersing the boron nitride powder cooled to room temperature in ethanolamine-water mixed liquor with volume fraction of 75% according to the mass-volume ratio of boron nitride to the ethanolamine-water mixed liquor of 1:220g/mL, carrying out ultrasonic treatment for 4.5h at 52 ℃ by 350W, then carrying out centrifugal treatment for 35min at 3500r/min, carrying out reduced pressure filtration on supernatant liquid, repeatedly washing the obtained filter cake with absolute ethyl alcohol, and drying to obtain boron nitride nanosheets;
2) firstly, weighing a proper amount of titanium tetrachloride and distilled water according to the volume ratio of the titanium tetrachloride to the distilled water of 2.5:120, adding a proper amount of distilled water dropwise under the stirring of 120r/min, stirring for 2.5h, adjusting the pH to 6.5 by using a 4.2mol/L sodium hydroxide solution, then adding boron nitride nanosheets according to the mass-to-volume ratio of the boron nitride nanosheets to the distilled water of 1:52g/mL, continuously stirring for 35min at 130r/min, transferring to a hydrothermal kettle, heating and reacting for 13h at 182 ℃, after the reaction liquid is cooled to room temperature, filtering under reduced pressure, repeatedly washing a filter cake by using deionized water, and drying to obtain pretreated boron nitride nanosheets;
3) dispersing the weighed pretreated boron nitride nanosheets into 75% ethanol solution according to the mass-to-volume ratio of 1:90g/mL, adding the silane coupling agent KH560 according to the volume ratio of the silane coupling agent KH560 to the ethanol solution of 1:190, heating the mixed solution to 63 ℃ in water bath, stirring and refluxing for 9h at 450r/min, then adding the weighed silicon carbide nanowires into the cooled mixed solution according to the mass ratio of the silicon carbide nanowires to the pretreated boron nitride nanosheets of 1:8.5, stirring for 1.5h at 450r/min, ultrasonically dispersing for 1.5h at 250W, pouring the obtained dispersion into a hollow polytetrafluoroethylene mold, vacuum filtering, preventing the filter cake in a forced air drying oven after the vacuum filtration is finished, drying at 65 ℃ for 23h, and grinding to obtain a silicon carbide/boron nitride compound with the particle size of 70 mu m;
4) weighing a proper amount of Ni60 nickel-based alloy powder, adding a silicon carbide/boron nitride compound into the alloy powder according to 4.5% of the mass of the Ni60 nickel-based alloy powder, uniformly mixing to obtain a cladding material, cleaning the surface of a fertilizer applicator component, drying the cladding material at a constant temperature of 105 ℃ for 7 hours, adjusting laser cladding technological parameters, carrying out laser cladding on the fertilizer applicator component to form a coating with the thickness of 0.8mm, finally cleaning the fertilizer applicator component subjected to laser cladding with alcohol, then polishing, and polishing with polishing paste to finish the treatment process.
Further, the particle size of the Ni60 nickel-based alloy powder is 150 meshes, and the chemical composition is as follows: 0.5% of C, 3.0% of B, 4.5% of Si, 18% of Cr, 15% of Fe and the balance of Ni.
Further, the laser cladding process parameters are as follows: the laser power is 1300W, the diameter of a light spot is phi 3mm, the moving speed of the light spot is 12mm/s, the lap joint rate is 28 percent, and the side blowing of 15L/min argon is adopted to protect a cladding area in the laser cladding process.
Example 3
A treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium comprises the following specific process steps:
1) weighing a proper amount of boron nitride powder, placing the crucible in a muffle furnace, carrying out heat preservation treatment for 3h at 900 ℃, dispersing the boron nitride powder cooled to room temperature in ethanolamine-water mixed liquor with volume fraction of 80% according to the mass-volume ratio of the boron nitride to the ethanolamine-water mixed liquor of 1:230g/mL, carrying out ultrasonic treatment for 5h at 55 ℃ by 400W, then carrying out centrifugal treatment for 40min at 4000r/min, carrying out reduced pressure filtration on supernatant liquid, repeatedly washing an obtained filter cake with absolute ethyl alcohol, and drying to obtain boron nitride nanosheets;
2) firstly, weighing a proper amount of titanium tetrachloride and distilled water according to the volume ratio of 3:120, placing the titanium tetrachloride in a container, dropwise adding a proper amount of distilled water under the stirring of 150r/min, stirring for 2h, adjusting the pH to 6.5 by using a 4.5mol/L sodium hydroxide solution, then adding boron nitride nanosheets according to the mass-to-volume ratio of 1:55g/mL of boron nitride nanosheets to the distilled water, continuously stirring for 40min at 150r/min, transferring to a hydrothermal kettle, heating and reacting for 15h at 185 ℃, cooling the reaction liquid to room temperature, filtering under reduced pressure, repeatedly washing a filter cake by using deionized water, and drying to obtain pretreated boron nitride nanosheets;
3) dispersing the weighed pretreated boron nitride nanosheets into an ethanol solution with the mass fraction of 80% according to the mass-to-volume ratio of 1:100g/mL, adding the silane coupling agent KH560 according to the volume ratio of the silane coupling agent KH560 to the ethanol solution of 1:200, heating the mixed solution in water bath to 65 ℃, stirring and refluxing for 10h at 500r/min, then adding the weighed silicon carbide nanowires into the cooled mixed solution according to the mass ratio of the silicon carbide nanowires to the pretreated boron nitride nanosheets of 1:9, stirring at 500r/min for 2h, ultrasonically dispersing at 300W for 2h, pouring the obtained dispersion into a hollow polytetrafluoroethylene mold, vacuum filtering, preventing the filter cake from being placed in a forced air drying oven after the vacuum filtration is completed, drying at 70 ℃ for 25h, and grinding to obtain a silicon carbide/boron nitride compound with the particle size of 80 mu m;
4) weighing a proper amount of Ni60 nickel-based alloy powder, adding a silicon carbide/boron nitride compound into the alloy powder according to 5.5% of the mass of the Ni60 nickel-based alloy powder, uniformly mixing to obtain a cladding material, cleaning the surface of a fertilizer applicator component, drying the cladding material at a constant temperature of 110 ℃ for 8 hours, adjusting laser cladding technological parameters, carrying out laser cladding on the fertilizer applicator component to form a coating with the thickness of 1.0mm, finally cleaning the fertilizer applicator component subjected to laser cladding with alcohol, then polishing, and polishing the polishing paste to finish the treatment process.
Further, the particle size of the Ni60 nickel-based alloy powder is 100-200 meshes, and the chemical components are as follows: 0.5% of C, 3.0% of B, 4.5% of Si, 18% of Cr, 15% of Fe and the balance of Ni.
Further, the laser cladding process parameters are as follows: the laser power is 1600W, the diameter of a light spot is phi 4mm, the moving speed of the light spot is 15mm/s, the lap joint rate is 30 percent, and a cladding area is protected by side blowing of 17L/min argon gas in the laser cladding process.
Comparative example 1: process steps 2) -3) were removed and the rest the same as in example 1.
Comparative example 2: process step 3) was removed and the rest was the same as in example 1.
Comparative example 3: process step 2) was removed and the rest was the same as in example 1.
Comparative example 4: the high-temperature calcination treatment in process step 1) was removed, and the process was otherwise the same as in example 1.
Comparative example 5: the silane coupling agent KH560 in process step 3) was removed, and the process was the same as in example 1.
Control group: the granularity is 100 meshes, and the chemical components are as follows: taking 0.5% of C, 3.0% of B, 4.5% of Si, 18% of Cr, 15% of Fe, and the balance of Ni60 nickel-based alloy powder as a cladding material, cleaning the surface of the fertilizer applicator component, drying the cladding material at a constant temperature of 100 ℃ for 6 hours, adjusting laser cladding process parameters, performing laser cladding treatment on the fertilizer applicator component to form a coating with the thickness of 0.5mm, finally cleaning the fertilizer applicator component subjected to laser cladding with alcohol, then polishing, and polishing the polishing paste to finish the treatment process, wherein the laser cladding process parameters are as follows: the laser power is 1200W, the diameter of a light spot is phi 2mm, the moving speed of the light spot is 10mm/s, the lap joint rate is 28 percent, and the side blowing of 13L/min argon is adopted to protect a cladding area in the laser cladding process.
Test experiments
The general carbon structural steel Q235 with the size of 100mm multiplied by 60mm multiplied by 8mm is selected as a test matrix, the process methods provided by examples 1-3, comparative examples 1-5 and a comparison group are respectively adopted to carry out laser cladding treatment on the carbon steel matrix, and then the following experiment is carried out on the corrosion resistance of the carbon steel matrix: according to the test method of GB/T10125-1997 salt spray test for artificial atmosphere corrosion test, each carbon steel matrix sample is tested, wherein the test solution is 55g/L sodium chloride aqueous solution, the pH is =6.5-7.2, the test temperature is 35 ℃, the test time is 50 days, the sample is finally washed with absolute ethyl alcohol for three times, dried to constant weight and weighed, and the mass loss rate W is calculated, wherein W = (M1-M2)/M1 x 100%, wherein the initial weight of M1, the post-test weight of M2, the mass loss rate of each group of process method provided carbon steel matrix samples is 50, the average value is calculated to be the mass loss rate of the group of samples, and the mass loss rates obtained in examples 1-3 and comparative examples 1-5 are compared with the mass loss rate of the control group of samples, and the results are as follows: in example 1, compared with a control group, the mass loss rate is reduced by 58.3%; example 2 compared with the control group, the mass loss rate is reduced by 59.7%; example 3 compared with the control group, the mass loss rate is reduced by 58.8%; compared with a control group, the mass loss rate of the comparative example 1 is reduced by 26.7 percent; compared with a control group, the mass loss rate of the comparative example 2 is reduced by 36.2 percent; compared with a control group, the mass loss rate of the comparative example 3 is reduced by 34.6 percent; compared with a control group, the mass loss rate of the comparative example 4 is reduced by 42.7 percent; comparative example 5 the mass loss rate was reduced by 45.3% compared to the control.
According to the test results, the process method provided by the invention can enable the cladding layer to have a good anticorrosion effect, and is beneficial to realizing high-efficiency anticorrosion performance of the fertilizing mechanism.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (7)
1. A treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium is characterized by comprising the following specific process steps:
1) weighing a proper amount of boron nitride powder (purchased from Shanghai Aladdin sublimation science and technology Co., Ltd., belonging to H-type boron nitride), placing the boron nitride powder into a crucible, placing the crucible into a muffle furnace, carrying out heat preservation treatment at 850-900 ℃ for 2-3H, cooling to room temperature, dispersing in ethanolamine-water mixed solution, carrying out ultrasonic treatment at 50-55 ℃ for 4-5H, then carrying out centrifugal treatment at 3000-4000r/min for 30-40min, carrying out reduced pressure filtration on supernatant liquid, repeatedly washing the obtained filter cake with absolute ethyl alcohol, and drying to obtain boron nitride nanosheets;
2) measuring a proper amount of titanium tetrachloride, placing the titanium tetrachloride in a container, dropwise adding a proper amount of distilled water under stirring, stirring for 1-2h, adjusting the pH to 6-6.5, adding a proper amount of boron nitride nanosheets, stirring for 30-40min, transferring the mixture to a hydrothermal kettle, heating and reacting for 12-15h at the temperature of 185 ℃, after the reaction liquid is cooled to room temperature, carrying out reduced pressure filtration, repeatedly washing a filter cake with deionized water, and drying to obtain pretreated boron nitride nanosheets;
3) weighing a proper amount of pretreated boron nitride nanosheets, dispersing the pretreated boron nitride nanosheets in an ethanol solution, adding a small amount of silane coupling agent KH560, heating the mixed solution in a water bath to 60-65 ℃, magnetically stirring and refluxing for 8-10h, weighing a proper amount of silicon carbide nanowires, adding the silicon carbide nanowires into the cooled mixed solution, continuously magnetically stirring for 1-2h, ultrasonically dispersing for 1-2h, pouring the obtained dispersion liquid into a hollow polytetrafluoroethylene mold for vacuum filtration, after the filtration is finished, preventing a filter cake from being placed in a forced air drying oven, and drying and grinding to obtain a silicon carbide/boron nitride compound;
4) weighing a proper amount of Ni60 nickel-based alloy powder, adding a certain amount of silicon carbide/boron nitride compound into the alloy powder, uniformly mixing to obtain a cladding material, cleaning the surface of the fertilizer applicator component, drying the cladding material at a constant temperature of 100 ℃ and 110 ℃ for 6-8h, adjusting laser cladding process parameters, performing laser cladding treatment on the fertilizer applicator component, cleaning the fertilizer applicator component after laser cladding with alcohol, then polishing, and polishing with polishing paste to finish the treatment process.
2. The treatment process for improving the corrosion resistance of a fertilizing mechanism part in contact with a corrosive medium as claimed in claim 1, wherein in the process step 1), the mass-to-volume ratio of the boron nitride to the ethanolamine-water mixed solution is 1:200-230 g/mL; in the ethanolamine-water mixed solution, the volume fraction of ethanolamine is 70-80%; the power of the ultrasonic treatment is 300-400W.
3. The process according to claim 1, wherein in step 2), the volume ratio of titanium tetrachloride to distilled water is 2-3: 120; the mass volume ratio of the boron nitride nanosheet to the distilled water is 1:50-55 g/mL; the stirring speed is 100-150 r/min; the pH value is adjusted by using 4-4.5mol/L sodium hydroxide solution.
4. The treatment process for improving the corrosion resistance of the fertilizing mechanism contacted with the corrosive medium as claimed in claim 1, wherein in the process step 3), the mass-to-volume ratio of the pretreated boron nitride nanosheets to the ethanol solution is 1:80-100 g/mL; the mass fraction of the ethanol solution is 70-80%; the volume ratio of the silane coupling agent KH560 to the ethanol solution is 1: 180-200; the mass ratio of the silicon carbide nanowire to the pretreated boron nitride nanosheet is 1: 8-9.
5. The treatment process for improving the corrosion resistance of the fertilizing mechanism contacted with the corrosive medium as claimed in claim 1, wherein in the step 3), the rotation speed of the magnetic stirring is 400-500 r/min; the power of the ultrasonic dispersion is 200-300W; the drying temperature is 60-70 ℃, and the drying time is 20-25 h; the particle size of the silicon carbide/boron nitride compound is 50-80 μm.
6. The treatment process for improving the corrosion resistance of the fertilizing mechanism component in contact with the corrosive medium as claimed in claim 1, wherein in the process step 4), the particle size of the Ni60 Ni-based alloy powder is 100-200 meshes, and the chemical compositions are as follows: 0.5 percent of C, 3.0 percent of B, 4.5 percent of Si, 18 percent of Cr/15 percent of Fe, and the balance of Ni.
7. The treatment process for improving the corrosion resistance of the fertilizing mechanism part in contact with the corrosive medium as claimed in claim 1, wherein in the process step 4), the addition amount of the silicon carbide/boron nitride compound is 3.5-5.5% of the mass of the Ni60 nickel-based alloy powder; the process parameters are as follows: the laser power is 1200-1600W, the diameter of a light spot is phi 2-4mm, the moving speed of the light spot is 10-15mm/s, the lap joint rate is 28-30%, and argon gas with the volume of 13-17L/min is blown laterally to protect a cladding area in the laser cladding process; the thickness of the coating is 0.5-1.0 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117141077A (en) * | 2023-11-01 | 2023-12-01 | 南通金丝楠膜材料有限公司 | Barrier type polyethylene single-material composite antibacterial film and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117141077A (en) * | 2023-11-01 | 2023-12-01 | 南通金丝楠膜材料有限公司 | Barrier type polyethylene single-material composite antibacterial film and preparation method thereof |
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Application publication date: 20210316 |