CN113416910B - Wear-resistant and corrosion-resistant high-entropy amorphous alloy powder, coating thereof, preparation method of coating and application of coating - Google Patents
Wear-resistant and corrosion-resistant high-entropy amorphous alloy powder, coating thereof, preparation method of coating and application of coating Download PDFInfo
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Abstract
The invention discloses wear-resistant and corrosion-resistant high-entropy amorphous alloy powder which comprises, by atomic percentage, 25% of Co, 25% of Ni, 15-20% of Cr, 5-10% of Mo, 2-4% of Nb, 14% of B and 6% of Si. The invention also discloses a coating prepared by adopting the wear-resistant and corrosion-resistant high-entropy amorphous alloy powder. The invention also discloses a preparation method of the coating and application of the coating in wear-resistant and corrosion-resistant parts. The high-entropy amorphous coating prepared by the invention has high amorphous content, and the multi-pass spraying heat accumulation and alternate air cooling conditions promote the amorphous coating to separate out 50-100 nm dispersed nanocrystals, and the dispersed nanocrystals obviously improve the fracture toughness of the amorphous coating. In addition, effective heat accumulation and alternate air cooling prevent the coating from generating cracks caused by overlarge thermal stress, and further the binding force and the quality of the coating are obviously improved.
Description
Technical Field
The invention relates to wear-resistant and corrosion-resistant high-entropy amorphous alloy powder, a coating thereof, a preparation method of the coating and application, and belongs to the technical field of alloys.
Background
The key parts of ocean engineering equipment (such as water turbine blades, ocean drilling platforms, oil and gas exploration and production equipment and the like) are mainly in ocean harsh environments, are easy to corrode and damage and corrode and wear, are easy to cause safety accidents, and cause irreversible damage to social economy and ocean ecological environments.
In order to reduce the damage and loss caused by abrasion and corrosion, many countries are devoted to research on abrasion resistance and corrosion resistance. The wear and corrosion of the workpiece firstly occur at the surface of the material, so the surface of the material is the key for controlling the wear and corrosion, and the quality of the surface determines the effect of wear resistance and corrosion resistance. The plasma spraying technology has the characteristics of low porosity of the coating, high bonding strength, high spraying efficiency, high bonding strength of the coating and the like, and is widely applied to the remanufacturing of ocean engineering equipment.
The high-entropy amorphous alloy is a novel amorphous material with the structural characteristics of the traditional amorphous material and the composition characteristics of the high-entropy alloy, has the characteristics of more obvious thermodynamic high-entropy effect and dynamic delayed diffusion effect, low growth rate of precipitated phases, high viscosity, strong capability of resisting atomic recombination and the like, has the characteristics of simple structure and uniform composition, does not have obvious element segregation and regional potential difference in the alloy, and has more excellent pitting corrosion resistance compared with the traditional amorphous material. In addition, the characteristic of high surface chemical reaction activity promotes the rapid formation and repair of the surface passivation film, and the corrosion rate is obviously reduced. J.B. Cheng and F.Shu et al prepared FeCoNi- (BSi), FeCoNiCr- (BSi) and FeCoNiNb- (BSi) high entropy amorphous alloy Coatings by laser cladding Technology (Surface and Coatings Technology, 2020, 402: 126320; Surface and Coatings Technology, 2020: 126321; Surface and Coatings Technology, 2019, 358: 667-. In terms of a material system, the existing high-entropy amorphous coating is limited in variety, a complete amorphous structure is not obtained yet by the high-entropy amorphous alloy material and the coating preparation method, the amorphous content of the laser cladding high-entropy amorphous coating is even lower than 50%, and the excellent corrosion resistance and wear resistance of the coating are difficult to ensure due to the lower amorphous content. Therefore, the development of novel wear-resistant and corrosion-resistant coating materials with high performance and long service life in severe service environments such as ocean is urgent.
Disclosure of Invention
The invention aims to solve the technical problem of providing wear-resistant and corrosion-resistant high-entropy amorphous alloy powder, wherein the alloy powder enables a coating material to meet the high-entropy effect under the thermodynamic condition on one hand and have high amorphous forming capability on the other hand by adding small-size atoms B, Si and amorphous forming promoting elements Mo and Nb, so that the coating material of the type has more excellent wear-resistant and corrosion-resistant characteristics.
Meanwhile, the invention provides a wear-resistant and corrosion-resistant high-entropy amorphous coating, the amorphous content of the coating is more than or equal to 95%, the porosity of the coating is less than 0.5%, the bonding strength is more than 60MPa, the Vickers hardness is more than 700HV, and nanocrystals with the particle size of 50-100 nm are dispersed and distributed in the coating, and the fracture toughness of the entropy amorphous coating can be obviously improved by the dispersed and distributed nanocrystals.
Meanwhile, the invention provides a preparation method of the wear-resistant and corrosion-resistant high-entropy amorphous coating, which has high amorphous content, and simultaneously, under the conditions of multi-pass spraying heat accumulation and alternate air cooling, the nano-crystals with dispersion distribution of 50-100 nm are promoted to be separated out from the high-entropy amorphous coating, and the fracture toughness of the amorphous coating is obviously improved by the nano-crystals with dispersion distribution; in addition, effective heat accumulation and alternate air cooling prevent the coating from generating cracks caused by overlarge thermal stress, and further the binding force and the quality of the coating are obviously improved; therefore, the prepared high-entropy amorphous coating has high wear resistance and high corrosion resistance and simultaneously obtains higher toughness.
Meanwhile, the invention provides application of the high-entropy amorphous coating in wear-resistant and corrosion-resistant parts, and the service environment of the wear-resistant and corrosion-resistant parts is preferably marine corrosion environment.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the wear-resistant and corrosion-resistant high-entropy amorphous alloy powder comprises, by atomic percentage, 25% of Co, 25% of Ni, 15-20% of Cr, 5-10% of Mo, 2-4% of Nb, 14% of B and 6% of Si.
The particle size of the high-entropy amorphous alloy powder is 150-800 meshes, and the purity is higher than 99.9%.
The coating prepared by the wear-resistant corrosion-resistant high-entropy amorphous alloy powder is adopted.
The preparation method of the wear-resistant and corrosion-resistant high-entropy amorphous coating comprises the following steps,
s01, pretreatment of the base material: selecting low-carbon steel as a base material, and pretreating for later use;
s02, drying the high-entropy amorphous alloy powder in a vacuum oven at 80 ℃ for 4 hours for later use;
s03, the dried powder in the step S02 is put into a powder feeder, and a plasma spraying device is adopted to prepare a coating, wherein the specific technological parameters are as follows: spraying current is 600-850A; spraying voltage is 60V, powder feeding amount is 40-50 g/min, Ar gas flow is 150-170 SCFH, H2The flow is 10-12 SCFH, the spraying distance is 90mm, and the moving speed of a spray gun is 1000 mm/s;
and repeating the S03 process to carry out continuous spraying, wherein the continuous spraying takes 3-5 passes as 1 group, compressed air is adopted for cooling in the spraying process, the pressure of the compressed air is 1.5-2 MPa, 3-5 groups are sprayed in total, the interval time of each group is 5-8 min, and the compressed air cooling is stopped during the interval.
The amorphous content of the prepared high-entropy amorphous coating is more than or equal to 95 percent, the porosity of the coating is less than 0.5 percent, the bonding strength is more than 60MPa, and the Vickers hardness is more than 700 HV.
The thickness of the high-entropy amorphous coating is 50-300 mu m.
The substrate pretreatment comprises oxide removal and surface cleaning; wherein the oxide removal is grinding by adopting a grinding wheel and surface sand blasting; the surface cleaning is to clean the surface in an alcohol solution by an ultrasonic method, and dry the surface in an oven for standby after the cleaning is finished.
The ultrasonic method is used for cleaning for at least 30 min.
And nanocrystals with the size of 50-100 nm are distributed in the high-entropy amorphous coating.
The base material is a Q235 steel block.
The coating is applied to wear-resistant and corrosion-resistant parts.
The wear-resistant and corrosion-resistant part comprises marine oil production equipment and propeller blades, and the service environment of the wear-resistant and corrosion-resistant part is a marine corrosion environment.
The invention has the following beneficial effects:
(1) the CoNiCrMoNbBSi high-entropy alloy amorphous coating is designed on the basis of the high-entropy effect and amorphous forming criterion of the multi-component alloy, and the coating material meets the high-entropy effect under thermodynamic conditions on one hand and has high amorphous forming capability on the other hand through the small-size atoms B, Si and the addition of amorphous forming elements Mo and Nb, so that the coating material has more excellent wear-resistant and corrosion-resistant characteristics.
(2) The alloy coating does not contain conventional amorphous forming elements such as Fe, C and the like, and the corrosion resistance of the coating can be further improved.
(3) The high-entropy amorphous coating material prepared by the invention has high amorphous content, and simultaneously promotes the precipitation of 50-100 nm dispersed nanocrystals in the amorphous coating under the condition of multi-pass spraying heat accumulator and alternate air cooling, and the fracture toughness of the amorphous coating is remarkably improved by the dispersed nanocrystals. In addition, effective heat accumulation and alternate air cooling prevent the coating from generating cracks caused by overlarge thermal stress, and further the binding force and the quality of the coating are obviously improved. Therefore, the prepared high-entropy amorphous coating has high wear resistance and high corrosion resistance and simultaneously obtains higher toughness.
Drawings
FIG. 1 is a cross-sectional view of the wear-resistant, corrosion-resistant, high-entropy amorphous alloy powder of the present invention;
FIG. 2 is a cross-sectional profile of a high entropy amorphous coating of the present invention;
FIG. 3 is an X-ray diffraction pattern of a high entropy amorphous coating of the present invention;
FIG. 4 is a high resolution image of a transmission electron microscope of the high-entropy amorphous coating and a selected electron diffraction image;
FIG. 5 is a graph of the coefficient of friction of the high entropy amorphous coating of the present invention;
FIG. 6 is a polarization curve diagram of the high-entropy amorphous coating and F22 marine steel of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example 1
The wear-resistant and corrosion-resistant high-entropy amorphous alloy powder comprises the following components in percentage by atom: 26% of Co, 26% of Ni, 18% of Cr, 8% of Mo, 2% of Nb, 14% of B and 6% of Si. The laminar flow ultrasonic argon atomization method is characterized in that the prepared powder is placed into a crucible furnace, vacuumized and then flushed with high-purity argon for smelting, liquid drops to be atomized after smelting are input to the surface of a tool head of an ultrasonic transducer, and the liquid drops are atomized into small liquid drops under ultrasonic vibration. Preparing high-entropy amorphous alloy powder by a laminar flow ultrasonic argon atomization method to obtain alloy powder with the granularity of 150-800 meshes, and screening out powder with three grain sizes of 150-300 meshes, 300-400 meshes and 400-800 meshes by using a powder screening machine.
The coating prepared by the wear-resistant corrosion-resistant high-entropy amorphous alloy powder is adopted.
The preparation method of the coating of the high-entropy amorphous alloy powder comprises the following steps,
s01, pretreatment of the base material: polishing the surface of a Q235 steel plate with the thickness of 10mm by using a grinding wheel, performing sand blasting treatment on the surface by using white corundum sand with the granularity of 40 meshes, wherein the sand blasting pressure is 0.7MPa, placing the Q235 steel plate in an alcohol solution after sand blasting, cleaning for 30min by adopting an ultrasonic method, and drying in an oven at 50 ℃ for later use after cleaning;
s02, drying the high-entropy amorphous powder with the granularity of 150-300 meshes in a vacuum oven at 80 ℃ for 4 hours for later use;
s03, the powder in the S02 is put into a powder feeder, and a plasma spraying device is adopted to prepare a coating, wherein the specific technological parameters are as follows: spraying current 700A; spraying voltage is 60V, powder feeding amount is 40g/min, Ar gas flow is 155 SCFH, H2The flow rate was 10 SCFH, the spraying distance was 90mm, and the moving speed of the spray gun was 1000 mm/s. And repeating the process to perform continuous spraying for 3 times to form 1 group, cooling by adopting compressed air in the spraying process, wherein the pressure of the compressed air is 1.5MPa, spraying for 5 groups in total, wherein the interval time of each group is 5min, and stopping air cooling in the interval period.
The high-entropy amorphous coating is applied to wear-resistant and corrosion-resistant parts.
The wear-resistant and corrosion-resistant part comprises marine oil production equipment and propeller blades, and the service environment of the wear-resistant and corrosion-resistant part is a marine corrosion environment.
The cross-sectional morphologies of the high-entropy amorphous alloy powder and the high-entropy amorphous coating prepared in example 1 are shown in fig. 1 and 2. It can be seen that the high-entropy amorphous alloy powder prepared by adopting the laminar flow ultrasonic argon atomization method has excellent sphericity, compact coating structure, coating porosity of 0.35 percent and thickness of 250 mu m, and the hardness of 703HV is tested by using an FM-700 type micro Vickers hardness tester. FIG. 3 is an X-ray diffraction pattern of the coating, and the peaks of steamed bread in the pattern show that the prepared coating is an amorphous coating with an amorphous content of more than 95%. FIG. 4 is a transmission electron microscope high resolution image of the high entropy amorphous coating and a selected electron diffraction pattern, from which it can be seen that the composite coating contains nanocrystals and amorphs, the size of the nanocrystals is about 50-100 nm (dashed line region).
FIG. 5 is a plot of the coefficient of friction of the coatings prepared, showing that the coefficient of friction of the coatings is stable, measured as a volumetric wear rate of 1.28X 10-6 mm3/(Nm). FIG. 6 is a polarization curve diagram of the prepared coating and F22 marine steel in simulated seawater, and the results show that the corrosion potential of the coating in seawater is higher than that of the marine steel, and the corrosion current density is lower than that of the marine steel, which shows that the prepared high-entropy amorphous coating has excellent seawater corrosion resistance.
Example 2
The wear-resistant and corrosion-resistant high-entropy amorphous alloy powder comprises the following components in percentage by atom: 26% of Co, 26% of Ni, 17% of Cr, 7% of Mo, 4% of Nb, 14% of B and 6% of Si. The laminar flow ultrasonic argon atomization method is characterized in that prepared powder is placed into a crucible furnace, vacuumized and then flushed with high-purity argon for smelting, liquid drops to be atomized after smelting are input to the surface of a tool head of an ultrasonic transducer, and the liquid drops are atomized into small liquid drops under ultrasonic vibration. Preparing high-entropy amorphous alloy powder by a laminar flow ultrasonic argon atomization method to obtain alloy powder with the granularity of 150-800 meshes, and screening out powder with three grain sizes of 150-300 meshes, 300-400 meshes and 400-800 meshes by using a powder screening machine.
The preparation method of the coating of the high-entropy amorphous alloy powder comprises the following steps,
s01, pretreatment of the base material: polishing the surface of a Q235 steel plate with the thickness of 10mm by using a grinding wheel, performing sand blasting treatment on the surface by using white corundum sand with the granularity of 40 meshes, wherein the sand blasting pressure is 0.7MPa, placing the steel plate in an alcohol solution after sand blasting, cleaning for 30min by adopting an ultrasonic method, and drying in an oven at 50 ℃ for later use after cleaning;
s02, drying the high-entropy amorphous powder with the granularity of 300-400 meshes in a vacuum oven at 80 ℃ for 4 hours for later use;
s03, the powder in the S02 is put into a powder feeder, and a plasma spraying device is adopted to prepare a coating, wherein the specific technological parameters are as follows: spray current 750A; spraying voltage is 60V, powder feeding amount is 45g/min, Ar gas flow is 160 SCFH, H2The flow rate was 11 SCFH, the spraying distance was 90mm, and the moving speed of the spray gun was 1000 mm/s. And repeating the process to continuously spray for 4 times to form 1 group, cooling by adopting compressed air in the spraying process, wherein the pressure of the compressed air is 1.5MPa, spraying for 4 groups in total, wherein the interval time of each group is 6min, and stopping air cooling in the interval period.
The prepared high-entropy amorphous coating has compact structure, compact coating structure, porosity of 0.40 percent and thickness of 230 mu m, the hardness of 720HV measured by an FM-700 type micro Vickers hardness tester, amorphous content of about 96 percent and bonding strength of 63.5 MPa.
Example 3
The wear-resistant and corrosion-resistant high-entropy amorphous alloy powder comprises the following components in percentage by atom: 26% of Co, 26% of Ni, 17% of Cr, 7% of Mo, 4% of Nb, 14% of B and 6% of Si. The laminar flow ultrasonic argon atomization method is characterized in that prepared powder is placed into a crucible furnace, vacuumized and then flushed with high-purity argon for smelting, liquid drops to be atomized after smelting are input to the surface of a tool head of an ultrasonic transducer, and the liquid drops are atomized into small liquid drops under ultrasonic vibration. Preparing high-entropy amorphous alloy powder by a laminar flow ultrasonic argon atomization method to obtain alloy powder with the granularity of 150-800 meshes, and screening out powder with three grain sizes of 150-300 meshes, 300-400 meshes and 400-800 meshes by using a powder screening machine.
The preparation method of the coating of the high-entropy amorphous alloy powder comprises the following steps,
s01, pretreatment of the base material: polishing the surface of a Q235 steel plate with the thickness of 10mm by using a grinding wheel, performing sand blasting treatment on the surface by using white corundum sand with the granularity of 40 meshes, wherein the sand blasting pressure is 0.7MPa, placing the steel plate in an alcohol solution after sand blasting, cleaning for 30min by adopting an ultrasonic method, and drying in an oven at 50 ℃ for later use after cleaning;
s02, drying the high-entropy amorphous powder with the granularity of 400-800 meshes in a vacuum oven at 80 ℃ for 4 hours for later use;
s03, the powder in the S02 is put into a powder feeder, and a plasma spraying device is adopted to prepare a coating, wherein the specific technological parameters are as follows: spraying current 800A; spraying voltage is 60V, powder feeding amount is 50g/min, Ar gas flow is 165 SCFH, H2The flow rate is 12SCFH, the spraying distance is 90mm, and the moving speed of the spray gun is 1000 mm/s. And repeating the process to continuously spray for 5 times to form 1 group, cooling by adopting compressed air in the spraying process, wherein the pressure of the compressed air is 2MPa, spraying 3 groups in total, the interval time of each group is 8min, and stopping air cooling in the interval period.
The prepared amorphous coating has compact structure, the porosity of the coating is 0.50 percent, the thickness of the coating is 260 mu m, the hardness of the coating is 700HV by using an FM-700 type micro Vickers hardness tester, the amorphous content reaches more than 95 percent, and the bonding strength is 64.2 MPa.
Example 4
This example differs from example 1 only in that:
the wear-resistant and corrosion-resistant high-entropy amorphous alloy powder comprises the following components in percentage by atom: 25% of Co, 25% of Ni, 16% of Cr, 10% of Mo, 4% of Nb, 14% of B and 6% of Si, wherein the effective grain diameter of the powder is 150-800 meshes, and the purity is higher than 99.9%.
The preparation method of the coating of the high-entropy amorphous alloy powder comprises the following steps,
s01, pretreatment of the base material: polishing the surface of a Q235 steel plate with the thickness of 10mm by using a grinding wheel, performing sand blasting treatment on the surface by using white corundum sand with the granularity of 40 meshes, wherein the sand blasting pressure is 0.7MPa, placing the steel plate in an alcohol solution after sand blasting, cleaning for 30min by adopting an ultrasonic method, and drying in an oven at 50 ℃ for later use after cleaning;
s02, drying the high-entropy amorphous powder in a vacuum oven at 80 ℃ for 4 hours for later use;
s03, the powder in the S02 is put into a powder feeder, and a plasma spraying device is adopted to prepare a coating, wherein the specific technological parameters are as follows: spraying current 600A; spraying voltage is 60V, powder feeding amount is 50g/min, Ar gas flow is 150 SCFH, H2The flow rate is 12SCFH, the spraying distance is 90mm, and the moving speed of the spray gun is 1000 mm/s. Repeating the above process to continuously spray for 5 times to obtain 1 group, and sprayingThe spraying process is characterized in that compressed air is adopted for cooling, the pressure of the compressed air is 2MPa, 3 groups are sprayed totally, the interval time of each group is 8min, and air cooling is stopped during the interval.
The prepared amorphous coating has compact structure, the porosity of the coating is 0.45 percent, the thickness of the coating is 200 mu m, the hardness of the coating is 710HV by using an FM-700 type micro Vickers hardness tester, the amorphous content reaches 95 percent, and the bonding strength is 64.2 MPa.
Example 5
This example differs from example 1 only in that:
the wear-resistant and corrosion-resistant high-entropy amorphous alloy powder comprises the following components in percentage by atom: 25% of Co, 25% of Ni, 20% of Cr, 6% of Mo, 4% of Nb, 14% of B and 6% of Si, wherein the effective grain diameter of the powder is 150-800 meshes, and the purity is higher than 99.9%.
The preparation method of the coating of the high-entropy amorphous alloy powder comprises the following steps,
s01, pretreatment of the base material: polishing the surface of a Q235 steel plate with the thickness of 10mm by using a grinding wheel, performing sand blasting treatment on the surface by using white corundum sand with the granularity of 40 meshes, wherein the sand blasting pressure is 0.7MPa, placing the steel plate in an alcohol solution after sand blasting, cleaning for 30min by adopting an ultrasonic method, and drying in an oven at 50 ℃ for later use after cleaning;
s02, drying the high-entropy amorphous powder in a vacuum oven at 80 ℃ for 4 hours for later use;
s03, the powder in the S02 is put into a powder feeder, and a plasma spraying device is adopted to prepare a coating, wherein the specific technological parameters are as follows: spraying current 850A; spraying voltage is 60V, powder feeding amount is 50g/min, Ar gas flow is 170SCFH, H2The flow rate is 12SCFH, the spraying distance is 90mm, and the moving speed of the spray gun is 1000 mm/s. And repeating the process to continuously spray for 5 times to form 1 group, cooling by adopting compressed air in the spraying process, wherein the pressure of the compressed air is 2MPa, spraying 3 groups in total, the interval time of each group is 8min, and stopping air cooling in the interval period.
The prepared amorphous coating has compact structure, the porosity of the coating is 0.50 percent, the thickness of the coating is 50 mu m, the hardness of the coating is 720HV by using an FM-700 type micro Vickers hardness tester, the amorphous content reaches 97 percent, and the bonding strength is 64.2 MPa.
Example 6
This example differs from example 1 only in that:
the wear-resistant and corrosion-resistant high-entropy amorphous alloy powder comprises the following components in percentage by atom: 25% of Co, 25% of Ni, 15% of Cr, 11% of Mo, 4% of Nb, 14% of B and 6% of Si, wherein the effective particle size of the powder is 150-800 meshes, and the purity is higher than 99.9%.
The prepared amorphous coating has compact structure, the porosity of the coating is 0.40 percent, the thickness of the coating is 300 mu m, the hardness of the coating is 720HV by using an FM-700 type micro Vickers hardness tester, the amorphous content reaches 96 percent, and the bonding strength is 62 MPa.
It should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. The preparation method of the wear-resistant and corrosion-resistant high-entropy amorphous coating is characterized in that the high-entropy amorphous coating is prepared from high-entropy amorphous alloy powder;
the high-entropy amorphous alloy powder comprises, by atomic percentage, 25% of Co, 25% of Ni, 15-20% of Cr, 5-10% of Mo, 2-4% of Nb, 14% of B and 6% of Si;
the preparation method of the high-entropy amorphous coating comprises the following steps,
s01, pretreatment of the base material: selecting low-carbon steel as a base material, and pretreating for later use;
s02, drying the high-entropy amorphous alloy powder in a vacuum oven at 80 ℃ for 4 hours for later use;
s03, the dried powder in the step S02 is put into a powder feeder, and a plasma spraying device is adopted to prepare a coating, wherein the specific technological parameters are as follows: spraying current is 600-850A; spraying voltage is 60V, powder feeding amount is 40-50 g/min, Ar gas flow is 150-170 SCFH, H2The flow is 10-12 SCFH, the spraying distance is 90mm, and the moving speed of a spray gun is 1000 mm/s;
repeating the S03 process to carry out continuous spraying, wherein the continuous spraying takes 3-5 passes as 1 group, compressed air is adopted for cooling in the spraying process, the pressure of the compressed air is 1.5-2 MPa, 3-5 groups are sprayed in total, the interval time of each group is 5-8 min, and the compressed air cooling is stopped during the interval period;
nanocrystals with the size of 50-100 nm are distributed in the high-entropy amorphous coating;
the corrosion potential of the coating in seawater is higher than that of the marine steel, and the corrosion current density is lower than that of the marine steel.
2. The preparation method according to claim 1, wherein the high-entropy amorphous alloy powder has a particle size of 150-800 meshes and a purity of more than 99.9%.
3. The preparation method according to claim 1, wherein the amorphous content of the prepared high-entropy amorphous coating is more than or equal to 95%, the porosity of the coating is less than 0.5%, the bonding strength is more than 60MPa, and the Vickers hardness is more than 700 HV.
4. The preparation method according to claim 1, wherein the thickness of the high-entropy amorphous coating is 50-300 μm.
5. The method of claim 1, wherein the substrate pretreatment comprises oxide removal and surface cleaning; wherein the oxide removal is grinding by adopting a grinding wheel and surface sand blasting; the surface cleaning is to clean the surface in an alcohol solution by an ultrasonic method, and dry the surface in an oven for standby after the cleaning is finished.
6. Use of the coating obtained by the preparation method according to claim 1 in wear-resistant, corrosion-resistant parts.
7. Use according to claim 6, characterized in that: the wear-resistant and corrosion-resistant part comprises marine oil production equipment and propeller blades, and the service environment of the wear-resistant and corrosion-resistant part is a marine corrosion environment.
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