CN115351271B - Impeller corrosion-resistant coating powder, impeller corrosion-resistant coating and preparation method thereof - Google Patents
Impeller corrosion-resistant coating powder, impeller corrosion-resistant coating and preparation method thereof Download PDFInfo
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- CN115351271B CN115351271B CN202211064216.5A CN202211064216A CN115351271B CN 115351271 B CN115351271 B CN 115351271B CN 202211064216 A CN202211064216 A CN 202211064216A CN 115351271 B CN115351271 B CN 115351271B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
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- 238000005728 strengthening Methods 0.000 abstract description 23
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 21
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Abstract
The invention discloses impeller corrosion-resistant coating powder, an impeller corrosion-resistant coating and a preparation method thereof. The impeller corrosion-resistant coating powder comprises: cr: 15-20 wt%; mo: 15-20 wt%; co:1 to 5 weight percent; cu:1 to 5 weight percent; w:1 to 4 weight percent; nb:1 to 3 weight percent; al:0.5 to 2 weight percent; ti:0.5 to 2 weight percent; rare earth oxide: 0.1 to 2 weight percent, and the balance being Ni. The impeller corrosion-resistant coating is prepared by a supersonic flame spraying and strengthening treatment method, and the prepared coating has the characteristics of uniform structure, good corrosion resistance, high bonding strength, good toughness, low porosity and the like, has high construction flexibility and preparation efficiency, and can meet the related protection requirements of electric machinery.
Description
Technical Field
The invention belongs to the technical field of metal material surface strengthening, and particularly relates to impeller corrosion-resistant coating powder, an impeller corrosion-resistant coating and a preparation method thereof.
Background
In the power industry, the running conditions of equipment such as a water turbine, a steam turbine, a desulfurization pump and the like are severe, and the surface of impeller parts is damaged generally, wherein the problems such as cavitation, water erosion, erosion and abrasion, high temperature and chemical corrosion are serious. After the surface of the high-speed rotating part is damaged, dynamic balance is damaged, vibration and high-frequency noise can be continuously generated, the operation efficiency can be reduced, the personnel safety and the service life of equipment are influenced, and hidden danger of power production is caused. At present, the surface strengthening treatment technology of the impeller part is mainly two types of surface modification strengthening and surface coating protection, but as the impeller part is mostly an irregular rotating body, the constructability of the surface modification strengthening technology is severely limited, and the surface coating protection technology has better application prospect from the aspects of functionality, flexibility and cost. Aiming at the severe dynamic working conditions, the protective coating has the excellent characteristics of high bonding strength, good strength and toughness, low porosity, higher hardness and the like besides good corrosion resistance so as to meet the actual needs.
The protective coating materials mainly comprise alloy materials, ceramic materials, polymer materials, composite materials and the like. However, the existing coating generally has the problems of poor coupling corrosion damage resistance, easy peeling failure, complex preparation and the like. Therefore, a coating for impeller components has the advantages of good corrosion resistance, high bonding strength, good toughness, low porosity, higher hardness, high construction flexibility and high preparation efficiency, and a preparation method thereof are in need of development.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems: impeller surface damage is a complex process of microscopic high-speed and multi-factor interaction and is the result of the combination of multiple mechanisms such as high-speed jet impact, chemical corrosion, mechanical abrasion, thermodynamic action and the like and nonlinear coupling action. The existing coating has the problems of poor coupling corrosion damage resistance, easy peeling failure, complex preparation and the like.
The coating can be prepared by adopting methods such as thermal spraying, laser cladding, electric spark/arc overlaying, PVD, CVD and the like. However, the construction flexibility of the laser cladding method is poor, and the thin-wall impeller deformation is easily caused by the high-energy heat accumulation of the laser micro-area; the surfacing method has low production efficiency and is only suitable for small-area repair and protection; PVD and CVD methods are generally insufficient in thickness for preparing the coating, and are complex to prepare and high in manufacturing cost.
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides impeller corrosion-resistant coating powder, an impeller corrosion-resistant coating and a preparation method thereof, wherein coating components comprise Ni, cr, mo, co, cu, W, nb, al, ti and rare earth oxide, a coating material is of a single-phase BCC structure, the impeller corrosion-resistant coating is prepared by a supersonic flame spraying and strengthening treatment method, and the prepared coating has the characteristics of uniform structure, good corrosion resistance, high bonding strength, good toughness, low porosity, higher hardness and the like, has high construction flexibility and preparation efficiency, and can meet the related protection requirements of electric machinery.
The embodiment of the invention provides impeller corrosion-resistant coating powder, which comprises the following components: cr: 15-20 wt%; mo: 15-20 wt%; co:1 to 5 weight percent; cu:1 to 5 weight percent; w:1 to 4 weight percent; nb:1 to 3 weight percent; al:0.5 to 2 weight percent; ti:0.5 to 2 weight percent; rare earth oxide: 0.1 to 2 weight percent, and the balance being Ni.
The impeller corrosion-resistant coating powder provided by the embodiment of the invention has the advantages and technical effects that: 1. in the embodiment of the invention, the matrix element Ni has good toughness and plasticity and obvious corrosion passivation tendency; and the powder can effectively dissolve Cr, mo, cu, W and other strengthening elements, and the coating prepared by the powder of the impeller corrosion-resistant coating has a single-phase BCC structure, and is stable and high in strength. Cr element has excellent high-temperature oxidation resistance, can improve the corrosion resistance of Ni matrix in strong oxidizing medium, and can inhibit harmful phase Ni 4 Precipitation of Mo. The solid solution strengthening effect of Mo, cu, co and other elements is remarkable, and the strength of the coating can be effectively enhanced and the toughness can be improved. Nb can adsorb O, S and other impurity elements, obviously refine grains and play a role in precipitation strengthening; the amorphous phase formation can be promoted under the high-cooling-rate deposition condition, and the strength and corrosion resistance of the coating are further improved. Proper elements such as Al, ti and the like are beneficial to improving the corrosion resistance of the impeller corrosion-resistant coating and refining the structure; the Al and Ti elements and the nickel matrix form intermetallic compounds such as Ni-Al, ni-Ti and the like, have the characteristics of coexistence of metal bonds and covalent bonds and the characteristic of long-range ordered structure, are beneficial to improving the strength and corrosion resistance of the impeller corrosion-resistant coating, and enable the coating to obtain excellent performances of high strength, high elastic modulus and fatigue stress resistance. The rare earth oxide with proper amount can purify grain boundary impurities, effectively refine the structure, improve the uniformity of a coating structure, reduce defects such as cracks and pores, and improve the compactness, corrosion resistance, microhardness and bonding strength of the coating; however, excessive rare earth oxide results in a reduced coating strength and reduced erosion and abrasion resistance. 2. In the embodiment of the invention, the impeller corrosion-resistant coating powder is added with a certain proportion of Cu, co, al, ti, nb, W and other elements on the basis of a Ni-Cr-Mo alloy system, thereby not only reducing the content of O, S and other harmful impurities while ensuring the corrosion resistance of the alloy coating, but also being combined and displayed through a plurality of mechanisms such as solid solution strengthening, precipitation strengthening, phase change strengthening and the likeThe strength of the single-phase BCC structure coating is remarkably improved.
In some embodiments, the rare earth oxide comprises La 2 O 3 、Y 2 O 3 、CeO 2 、Er 2 O 3 At least one of them.
In some embodiments, the impeller corrosion resistant coating powder further comprises at least one of the Fe, mn, V, zr, ta, re, hf, B, si elements in an amount that together do not exceed 5wt%; ni/(al+ti) =10 to 50.
In some embodiments, the impeller corrosion resistant coating powder has an impurity element C content of 0.01wt% or less; s content is less than or equal to 0.001wt%; the P content is less than or equal to 0.03wt%; the N content is less than or equal to 0.03wt%.
In some embodiments, the impeller corrosion resistant coating powder is produced using an atomization technique; the atomization technology comprises at least one of plasma atomization, smelting vacuum/gas atomization, rotary centrifugal atomization and ultrasonic atomization; the impeller corrosion-resistant coating powder is spherical; the particle size range of the impeller corrosion-resistant coating powder is 5-45 mu m, preferably, the impeller corrosion-resistant coating powder consists of fine powder with the particle size range of 5-25 mu m and coarse powder with the particle size range of 25-45 mu m, and the proportion of the fine powder to the coarse powder in the impeller corrosion-resistant coating powder is 10-90 wt%:90 to 10 weight percent.
The preparation method of the impeller corrosion-resistant coating provided by the embodiment of the invention comprises the following steps:
(1) Carrying out sand blasting treatment on the surface of the impeller, and cleaning;
(2) Spraying the impeller corrosion-resistant coating powder provided by the embodiment of the invention on the surface of the impeller cleaned in the step (1) by adopting a supersonic flame spraying process to form a coating;
(3) Heat treating the coating in step (2);
(4) And (3) polishing the coating subjected to the heat treatment in the step (3) to obtain the impeller corrosion-resistant coating.
The preparation method of the impeller corrosion-resistant coating provided by the embodiment of the invention has the advantages and technical effects that: the surface of the impeller is subjected to sand blasting treatment and cleaning, so that the contact area of the surface of the impeller is increased, impurities such as rust, greasy dirt and the like at the interface are reduced, and the bonding strength of the coating and the impeller matrix is improved. In the embodiment of the invention, ultrasonic flame spraying treatment is adopted, impeller corrosion-resistant coating powder is sprayed to the surface of the preheated impeller at ultrasonic speed after being melted by Gao Wenyan flow, and is rapidly cooled to form a uniform and compact impeller corrosion-resistant coating, and the prepared impeller corrosion-resistant coating has high compactness and low impurity content, has the bonding strength with a matrix of more than 74MPa, and is superior to the conventional spraying. The supersonic flame spraying treatment has high automation degree, is flexible and controllable, and is suitable for protecting parts with complex shapes such as impellers. In the embodiment of the invention, thermal stress, tissue stress, additional stress and the like exist on the surface after high-temperature high-speed spray chilling, so that the coating is easy to crack and fall off, the stress is removed by heat treatment on the coating, and the coating is effectively prevented from cracking on the premise of ensuring that the impeller is not deformed. In the embodiment of the invention, the surface polishing treatment procedure is added to remove the defects of bulges, pores and the like on the surface of the coating, so that the large-area damage failure of the coating caused by defect falling in the operation process is avoided; the surface smoothness of the impeller is ensured, the running efficiency is improved, and the impact corrosion resistance and the service life of the impeller are greatly improved.
In some embodiments, in the step (1), the sandblasted blasting material comprises at least one of pure alumina, brown alumina, quartz sand, and silicon carbide; the grain diameter of the spray material is 30-80 meshes; the pressure of the sand blasting treatment is 0.5-1 Mpa, the time of the sand blasting treatment is 5-120 min, the sand blasting angle of the sand blasting treatment is 30-60 degrees, and the sand blasting distance of the sand blasting treatment is 50-350 mm; the cleanliness of the surface of the impeller after being cleaned in the step (1) is more than Sa2.5 grade, and the roughness is more than Ra6.3.
In some embodiments, in step (2), the process parameters of the supersonic flame spraying process are: the oxygen flow is 1500-2500 SCFH, the aviation kerosene flow is 5-10 GPH, the spraying distance is 200-400 mm, the compressed air flow is 10-30 SCFH, the powder feeding amount is 40-150 g/min, the spraying linear velocity is 10-30 m/min, the pressure of a spray gun combustion chamber is 80-150 PSI, and the combustion air flow velocity is more than 1000 m/s; the temperature of the spraying position of the impeller is monitored online during the spraying process; the on-line monitoring is to monitor the temperature of the spraying position of the impeller on line by adopting a fixed four-point infrared thermometer, and the distance between the four infrared points is 50-100 mm; the initial temperature of the spraying position is not higher than 100 ℃.
In some embodiments, in the step (3), the heat treatment adopts a surface flame heat spraying treatment, the outer flame temperature of the surface flame heat spraying treatment is 100-600 ℃, the moving speed is 0.1-10 m/min, the time of the surface flame heat spraying treatment is 0.5-12 h, or the heat treatment adopts an in-furnace heat treatment, the temperature of the in-furnace heat treatment is 100-600 ℃, and the time of the in-furnace heat treatment is 0.5-12 h; in the step (4), the surface roughness of the impeller corrosion-resistant coating is Ra6.3 or less; the thickness of the impeller corrosion-resistant coating is 50-600 mu m.
The impeller corrosion-resistant coating is prepared by the preparation method of the embodiment of the invention. In the embodiment of the invention, the impeller corrosion-resistant coating is added with Cu, co, al, ti, nb, W and other elements in a certain proportion on the basis of a Ni-Cr-Mo alloy system. While the corrosion resistance of the alloy coating is ensured, the content of harmful impurities such as O, S is reduced, and the strength of the single-phase BCC structure coating is obviously improved through the combination of multiple mechanisms such as solid solution strengthening, precipitation strengthening, phase change strengthening and the like. The impeller corrosion-resistant coating has low porosity, high compactness, low impurity content, high bonding strength with a matrix of more than 74MPa and good corrosion resistance. The impeller corrosion-resistant coating can be used for impeller protection of water turbines, steam turbines, desulfurization pumps and other equipment.
Drawings
FIG. 1 is a flow chart of the process for preparing the corrosion-resistant coating for impellers of the present invention.
FIG. 2 is a microscopic morphology of the impeller corrosion resistant coating powder prepared in example 1 of the present invention.
Fig. 3 is an SEM image of the impeller corrosion-resistant coating prepared in example 1 of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The embodiment of the invention provides impeller corrosion-resistant coating powder, which comprises the following components: cr: 15-20 wt%; mo: 15-20 wt%; co:1 to 5 weight percent; cu:1 to 5 weight percent; w:1 to 4 weight percent; nb:1 to 3 weight percent; al:0.5 to 2 weight percent; ti:0.5 to 2 weight percent; rare earth oxide: 0.1 to 2 weight percent, and the balance being Ni.
The impeller corrosion-resistant coating powder provided by the embodiment of the invention has good toughness and plasticity and obvious corrosion passivation tendency; and the powder can effectively dissolve Cr, mo, cu, W and other strengthening elements, and the coating prepared by the powder of the impeller corrosion-resistant coating has a single-phase BCC structure, and is stable and high in strength. Cr element has excellent high-temperature oxidation resistance, can improve the corrosion resistance of Ni matrix in strong oxidizing medium, and can inhibit harmful phase Ni 4 Precipitation of Mo. The solid solution strengthening effect of Mo, cu, co and other elements is remarkable, and the strength of the coating can be effectively enhanced and the toughness can be improved. Nb can adsorb O, S and other impurity elements, obviously refine grains and play a role in precipitation strengthening; the amorphous phase formation can be promoted under the high-cooling-rate deposition condition, and the strength and corrosion resistance of the coating are further improved. Proper elements such as Al, ti and the like are beneficial to improving the corrosion resistance of the impeller corrosion-resistant coating and refining the structure; the Al and Ti elements and the nickel matrix form intermetallic compounds such as Ni-Al, ni-Ti and the like, have the characteristics of coexistence of metal bonds and covalent bonds and the characteristic of long-range ordered structure, are beneficial to improving the strength and corrosion resistance of the impeller corrosion-resistant coating, and enable the coating to obtain excellent performances of high strength, high elastic modulus and fatigue stress resistance. The rare earth oxide with proper amount can purify grain boundary impurities, effectively refine the structure, improve the uniformity of a coating structure, reduce defects such as cracks and pores, and improve the compactness, corrosion resistance, microhardness and bonding strength of the coating; however, excessive rare earth oxide results in a reduced coating strength and reduced erosion and abrasion resistance. In the embodiment of the invention, the impeller corrosion-resistant coating powder is added with a certain proportion of Cu, co, al, ti, nb, W and other elements on the basis of a Ni-Cr-Mo alloy system, thereby not only reducing the content of O, S and other harmful impurities while ensuring the corrosion resistance of the alloy coating, but also strengthening by solid solution and precipitation,The strength of the single-phase BCC structure coating is obviously improved by combining various mechanisms such as phase change strengthening and the like.
In some embodiments, preferably, the impeller corrosion resistant coating powder comprises: cr: 16-18 wt%; mo: 16-18 wt%; co:3 to 4 weight percent; cu:1 to 5 weight percent; w:2 to 3 weight percent; nb:1 to 3 weight percent; al:0.5 to 1wt percent; ti:1 to 1.5 weight percent; rare earth oxide: 0.1 to 2 weight percent, and the balance being Ni.
In some embodiments, the rare earth oxide comprises La 2 O 3 、Y 2 O 3 、CeO 2 、Er 2 O 3 At least one of, preferably La 2 O 3 . In the embodiment of the invention, the rare earth oxide type is optimized, which is favorable for further optimizing the performances of the impeller corrosion-resistant coating, such as tissue uniformity, corrosion resistance, bonding strength, toughness, porosity and the like. The lanthanum oxide belongs to typical lanthanide rare earth oxides, has stronger effects of purifying grain boundaries and refining tissues, and can reduce the porosity of a coating and improve the uniformity of the tissues by properly adding the lanthanum oxide, and the strength of the coating can be improved by pinning dislocation of a dispersed phase of the lanthanum oxide.
In some embodiments, the impeller corrosion resistant coating powder further comprises at least one of the Fe, mn, V, zr, ta, re, hf, B, si elements; the sum of the contents is not more than 5wt%. In the embodiment of the invention, the addition of the low-melting-point element B, si can reduce the melting point of the alloy and promote the formation of micro amorphous phase in the coating, thereby further improving the strength, corrosion resistance and wear resistance of the coating. Fe. Mn, V, zr, ta, re, hf, B, si can be added properly, but when the content is too high, uncontrollable harmful phases are generated or the tissue heterogeneity is aggravated, thereby having a negative effect on the improvement of the coating performance.
In some embodiments, ni/(al+ti) =10 to 50, alternatively 20 to 40, preferably 20 to 35, more preferably 24.45 to 25.75. In the embodiment of the invention, proper elements such as Al, ti and the like can form intermetallic compounds with the nickel matrix, which is beneficial to improving the strength and corrosion resistance of the nickel-based alloy coating. The excessive or improper proportion of Al, ti and other elements can change the lattice structure of the coating, so that the lattice matching degree is reduced and harmful phases are formed, the corrosion resistance of the coating is reduced, and the toughness is influenced; also, powder fusion weldability is reduced, resulting in a decrease in the powder coating rate of thermal spraying.
In some embodiments, the impeller corrosion resistant coating powder has an impurity element C content of 0.01wt% or less; s content is less than or equal to 0.001wt%; the P content is less than or equal to 0.03wt%; the N content is less than or equal to 0.03wt%. In the embodiment of the invention, impurity elements are gathered among grains or among layers of the coating, so that the bonding strength of the coating can be reduced; the impurity element causes electrochemical corrosion in the micro-area, the corrosion resistance is reduced, and the coating is easy to peel off and lose efficacy under severe working conditions.
In some embodiments, the impeller corrosion resistant coating powder is produced using an atomization technique; the atomization technology comprises at least one of plasma atomization, smelting vacuum/gas atomization, rotary centrifugal atomization and ultrasonic atomization. In the embodiment of the invention, the impeller corrosion-resistant coating powder is prepared by adopting an atomization technology, and compared with the powder prepared by sintering, crushing and pulverizing, the powder prepared by adopting the atomization technology has the advantages of high sphericity, good fluidity, good powder morphology and uniformity, less introduced impurities in the preparation process and high purity, and is more suitable for preparing the coating by adopting a supersonic flame spraying process.
In some embodiments, the impeller corrosion resistant coating powder is spherical; the particle size range of the impeller corrosion-resistant coating powder is 5-45 mu m, preferably, the impeller corrosion-resistant coating powder consists of fine powder with the particle size range of 5-25 mu m and coarse powder with the particle size range of 25-45 mu m, and the proportion of the fine powder to the coarse powder in the impeller corrosion-resistant coating powder is 10-90 wt%:90 to 10wt%, preferably 50 to 50wt% or 40 to 60wt%. In the embodiment of the invention, the particle morphology of the impeller corrosion-resistant coating powder is mainly spherical, so that the fluidity can be increased. In addition, the smaller the powder particle size, the higher the density of the prepared coating, but the easier the coating is to melt and plug the spray gun; the larger the particle size of the powder is, the easier the powder is sprayed out, but the prepared coating has large pores, in the embodiment of the invention, the impeller corrosion-resistant coating powder is preferably composed of fine powder with the particle size range of 5-25 mu m and coarse powder with the particle size range of 25-45 mu m, and the powder with different particle sizes is matched for use, so that the coating pores can be effectively filled, and better compactness and fracture toughness can be obtained.
As shown in fig. 1, the preparation method of the impeller corrosion-resistant coating in the embodiment of the invention comprises the following steps:
(1) Carrying out sand blasting treatment on the surface of the impeller, and cleaning;
(2) Spraying the impeller corrosion-resistant coating powder provided by the embodiment of the invention on the surface of the impeller cleaned in the step (1) by adopting a supersonic flame spraying process to form a coating;
(3) Heat treating the coating in step (2);
(4) And (3) polishing the coating subjected to the heat treatment in the step (3) to obtain the impeller corrosion-resistant coating.
According to the preparation method of the impeller corrosion-resistant coating, the impeller surface is subjected to sand blasting treatment and cleaning, so that the contact area of the impeller surface is increased, impurities such as rust, oil stains and the like at the interface are reduced, and the bonding strength of the coating and an impeller substrate is improved. In the embodiment of the invention, ultrasonic flame spraying treatment is adopted, impeller corrosion-resistant coating powder is sprayed to the surface of the preheated impeller at ultrasonic speed after being melted by Gao Wenyan flow, and is rapidly cooled to form a uniform and compact impeller corrosion-resistant coating, and the prepared impeller corrosion-resistant coating has high compactness and low impurity content, has the bonding strength with a matrix of more than 74MPa, and is superior to the conventional spraying. The supersonic flame spraying treatment has high automation degree, is flexible and controllable, and is suitable for protecting parts with complex shapes such as impellers. In the embodiment of the invention, thermal stress, tissue stress, additional stress and the like exist on the surface after high-temperature high-speed spray chilling, so that the coating is easy to crack and fall off, the stress is removed by heat treatment on the coating, and the coating is effectively prevented from cracking on the premise of ensuring that the impeller is not deformed. In the embodiment of the invention, the surface polishing treatment procedure is added to remove the defects of bulges, pores and the like on the surface of the coating, so that the large-area damage failure of the coating caused by defect falling in the operation process is avoided; the surface smoothness of the impeller is ensured, the running efficiency is improved, and the impact corrosion resistance and the service life of the impeller are greatly improved.
In some embodiments, in the step (1), the sandblasted blasting material comprises at least one of pure alumina, brown alumina, quartz sand, silicon carbide, preferably pure alumina; the grain diameter of the spray material is 30-80 meshes; the pressure of the sand blasting treatment is 0.5-1 Mpa, the time of the sand blasting treatment is 5-120 min, the sand blasting angle of the sand blasting treatment is 30-60 degrees, optionally 45 degrees, and the sand blasting distance of the sand blasting treatment is 50-350 mm, optionally 80-100mm. In some embodiments, the surface of the impeller after being cleaned in the step (1) has a cleanliness of Sa2.5 or more and a roughness of Ra6.3 or more. In the embodiment of the invention, the cleanliness of the impeller surface reaches more than Sa2.5 level, the roughness reaches more than Ra6.3 level, the contact area of the impeller surface is increased, interface impurities are reduced, and the bonding strength of the coating and the impeller matrix is improved.
In some embodiments, in step (2), the process parameters of the supersonic flame spraying process are: the oxygen flow is 1500-2500 SCFH, the aviation kerosene flow is 5-10 GPH, the spraying distance is 200-400 mm, the compressed air flow is 10-30 SCFH, the powder feeding amount is 40-150 g/min, the spraying linear velocity is 10-30 m/min, the pressure of a spray gun combustion chamber is 80-150 PSI, and the combustion air flow velocity is more than 1000 m/s; the position temperature of the impeller spraying matrix is monitored online during the spraying process; the on-line monitoring is to monitor the temperature of the spraying position of the impeller on line by adopting a fixed four-point infrared thermometer, and the distance between the four infrared points is 50-100 mm; the initial temperature of the position of the spraying matrix is not higher than 100 ℃ in each pass. In the embodiment of the invention, the impeller is subjected to multi-pass supersonic flame spraying treatment, and after being melted by Gao Wenyan flow, impeller corrosion-resistant coating powder is sprayed to the surface of the preheated impeller at supersonic speed, and is rapidly cooled to form uniform and compact impeller corrosion-resistant coating. During spraying, a fixed four-point infrared thermometer is adopted to monitor the temperature of the spraying position of the impeller on line, and the initial temperature is set to be not higher than 100 ℃, so that the problems of thermal deformation and the like of thin-wall impeller spraying can be effectively avoided. The hot spraying process has high automation degree, is flexible and controllable, and is suitable for protecting parts with complex shapes such as impellers. The supersonic flame spraying adopts aviation kerosene liquid fuel, so that the cost is low; the gas flow speed of combustion is high, but the temperature is lower than that of gas fuel, and the gas fuel is suitable for powder thermal spraying operation containing easily oxidized elements such as Al, ti, nb and the like, and the obtained coating has high compactness, low impurity content and high bonding strength with a matrix reaching more than 74MPa, and is superior to the conventional spraying level. The compressed air is used as carrier gas, so that the cost is saved, the compressed air can be used as combustion-supporting gas to promote powder melting, the efficiency is high, and the effect is good.
In some embodiments, in the step (3), the heat treatment is a surface flame heat spraying treatment, the outer flame temperature of the surface flame heat spraying treatment is 100-600 ℃, the moving speed is 0.1-10 m/min, the time of the surface flame heat spraying treatment is 0.5-12 h, or the heat treatment is an in-furnace heat treatment, the temperature of the in-furnace heat treatment is 100-600 ℃, optionally 100-500 ℃, preferably 200 ℃, and the time of the in-furnace heat treatment is 0.5-12 h, preferably 3h. In the embodiment of the invention, the small part adopts a furnace low-temperature long-time heat treatment method, so that the residual stress is effectively removed, the cracking of a coating is avoided, and the thermal deformation of an impeller is avoided. The large-scale part can adopt a surface flame thermal spraying treatment method to eliminate residual stress, and effectively avoid coating cracking on the premise of ensuring that the impeller is not deformed, and because the coating is blocked, the outer flame only acts on the coating, the flame moving speed is high, the pore air of the coating is insulated, the temperature actually conducted to the impeller matrix is not high, the heat treatment can play a role of reducing or eliminating the residual stress in the preparation process of the coating, but the combination condition of the impeller matrix and the coating is not influenced, and the impeller matrix and the coating are mechanically combined. In addition, the heat treatment may not be performed.
In some embodiments, in the step (4), the polishing method is at least one of curved grinding wheel polishing, sand paper polishing and scouring pad polishing; the polishing is at least one of machining curved surface polishing and grinding polishing. In some embodiments, in the step (4), the impeller corrosion-resistant coating has a surface roughness of Ra6.3 or less, preferably Ra3.2 or less, and more preferably Ra1.6 or less. In the embodiment of the invention, thermal stress, tissue stress, additional stress and the like exist on the surface after high-temperature high-speed spraying chilling, so that the coating is easy to crack and fall off, and after the coating is cooled to room temperature, the surface of the coating is polished to ensure the surface smoothness, and the defects of partial bulges, air holes and the like are removed, so that the large-area damage failure of the coating caused by the fall-off of the defects in the operation process is avoided, the operation efficiency is improved, and the impact corrosion resistance and the service life of the impeller are greatly improved.
In some embodiments, in step (4), the impeller corrosion resistant coating has a thickness of 50 to 600 μm, alternatively 300 to 450 μm. In the embodiment of the invention, the impeller corrosion-resistant coating can effectively resist the multi-factor coupling corrosion damage of the impeller under the complex working condition.
The impeller corrosion-resistant coating is prepared by the preparation method of the embodiment of the invention. In the embodiment of the invention, the impeller corrosion-resistant coating is added with Cu, co, al, ti, nb, W and other elements in a certain proportion on the basis of a Ni-Cr-Mo alloy system. While the corrosion resistance of the alloy coating is ensured, the content of harmful impurities such as O, S is reduced, and the strength of the single-phase BCC structure coating is obviously improved through the combination of multiple mechanisms such as solid solution strengthening, precipitation strengthening, phase change strengthening and the like. The impeller corrosion-resistant coating has low porosity, high compactness, low impurity content, high bonding strength with a matrix of more than 74MPa and good corrosion resistance. The impeller corrosion-resistant coating can be used for impeller protection of water turbines, steam turbines, desulfurization pumps and other equipment.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not limiting in any way.
In the following examples, bond strength measurements were carried out in accordance with GB/T8642-2002 "determination of thermal spray-tensile bond strength", hardness measurements were carried out in accordance with GB/T4340.1-1999 "section 1 of the metal Vickers hardness test: test methods, thickness detection was carried out according to GB/T11374-2012, non-destructive measurement method of thermal spray coating thickness. Porosity measurements were made according to ASTM E2109-2001 (2014), standard test method for determining the percentage of area of porosity of thermal spray coatings. The corrosion resistance detection is carried out according to GB/T37595-2019 'full life cycle requirement of corrosion resistant coating corrosion control engineering' and GB/T10125-2012 'salt spray test of artificial atmosphere corrosion test'.
Example 1
The first step: preparation of impeller corrosion-resistant coating powder. Alloy ratio: cr:18wt%; mo:18wt%; co:4wt%; cu:3wt%; w:2wt%; nb:2wt%; al:1wt%; ti:1wt%; v:0.8wt%; hf:0.8wt%; la (La) 2 O 3 :0.5wt% Ni, the balance being Ni/(Al+Ti) about 24.45. The materials are added into a vacuum induction furnace to be melted, then, an alloy powder is obtained by adopting a plasma atomization method, the alloy powder with the granularity range of 5-25 mu m and 25-45 mu m is vibration-screened after being dried for 3 hours at the constant temperature of 60 ℃, and the proportion of fine powder with the granularity range of 5-25 mu m and coarse powder with the granularity range of 25-45 mu m in the impeller corrosion-resistant coating powder is 50wt%:50wt%.
And a second step of: and (5) impeller surface treatment. After repair welding and processing leveling of damage of a desulfurization pump impeller (the material is Cr30A and the diameter is 1 m), adopting 35-mesh pure alumina sand to carry out sand blasting treatment for 15min under the air pressure of 1Mpa, wherein the sand blasting angle is 60 degrees, and the sand blasting distance is 100mm. Then cleaning the surface by adopting a metal cleaning agent until the surface is free of rust, greasy dirt and other impurities. The cleanliness of the impeller surface reaches Sa3 level, and the roughness reaches Ra6.3.
And a third step of: and (5) supersonic flame spraying. The impeller corrosion-resistant coating powder is sprayed to the surface of a workpiece at supersonic speed after being melted and atomized by Gao Wenyan flow, and is rapidly cooled to form a uniform and compact impeller corrosion-resistant coating. The technological parameters of the supersonic flame spraying are as follows: the oxygen flow is 2000SCFH, the aviation kerosene flow is 8GPH, the spraying distance is 370mm, the compressed air flow is 15SCFH, the powder feeding amount is 80g/min, and the spraying linear velocity is 20m/min. The lance combustion chamber pressure was 100PSI and the combustion gas flow rate was 1200m/s. The temperature of the spraying position of the impeller is monitored on line by adopting a fixed four-point infrared thermometer during spraying, the distance between the four infrared points is 50mm, and the initial temperature of the position of a spraying matrix is not higher than 100 ℃.
Fourth step: the coating is heat treated to remove residual stress. The heat treatment process parameters of the resistance furnace are as follows: and (5) preserving heat for 3 hours at 200 ℃.
Fifth step: and (5) surface grinding and polishing treatment. After the coating is cooled to room temperature, the defects of partial bulges, air holes and the like are removed by adopting a grinding wheel polishing and five-axis machining center curved surface polishing method, the surface roughness of the coating is Ra1.6, and the impeller corrosion-resistant coating is prepared, and the thickness of the coating is 300 mu m.
Example 2
The first step: and preparing impeller corrosion-resistant coating powder. Alloy ratio: cr:16wt%; mo:16wt%; co:3wt%; cu:3wt%; w:3wt%; nb:2wt%; al:0.5wt%; ti:1.5wt%; fe:2wt%; ta:1wt%; y is Y 2 O 3 :0.5wt% Ni, the balance being Ni/(Al+Ti) about 25.75. The materials are added into a vacuum induction furnace to be melted, then alloy powder is obtained by adopting a vacuum atomization method, the alloy powder with the granularity range of 5-25 mu m and 25-45 mu m is vibration-screened after being dried for 2 hours at the constant temperature of 80 ℃, and the proportion of fine powder with the granularity range of 5-25 mu m and coarse powder with the granularity range of 25-45 mu m in the impeller corrosion-resistant coating powder is 40wt%:60wt%.
And a second step of: and (5) impeller surface treatment. After repair of damage repair welding and leveling of the impeller (ZG 0Cr16Ni5Mo, diameter 6 m) of the water turbine, adopting 40 mesh quartz sand to carry out sand blasting treatment for 120min under the pressure of 0.8Mpa, wherein the sand blasting angle is 45 degrees, and the sand blasting distance is 80mm. Then cleaning the surface by adopting a metal cleaning agent until the surface is free of rust, greasy dirt and other impurities. The cleanliness of the impeller surface reaches Sa2.5 level, and the roughness reaches Ra6.3.
And a third step of: and (5) supersonic flame spraying. The impeller corrosion-resistant coating powder is sprayed to the surface of a workpiece at supersonic speed after being melted and atomized by Gao Wenyan flow, and is rapidly cooled to form a uniform and compact impeller corrosion-resistant coating. The technological parameters of the supersonic flame spraying are as follows: the oxygen flow is 2500SCFH, the aviation kerosene flow is 10GPH, the spraying distance is 220mm, the compressed air flow is 25SCFH, the powder feeding amount is 100g/min, and the spraying linear velocity is 20m/min. The lance combustion chamber pressure was 120PSI and the combustion gas flow rate was 1500m/s. The temperature of the spraying position of the impeller is monitored on line by adopting a fixed four-point infrared thermometer during spraying, the distance between the four infrared points is 80mm, and the initial temperature of the position of a spraying matrix is not higher than 100 ℃.
Fourth step: the residual stress is eliminated by flame thermal spraying treatment on the surface of the coating, the outer flame temperature is 500 ℃, the moving speed is 0.5m/min, and the treatment time is 3 hours.
Fifth step: and (5) surface grinding and polishing treatment. After the coating is cooled to room temperature, the defects of partial bulges, air holes and the like are removed by adopting a sand paper grinding and curved surface grinding and polishing method, so that the surface roughness of the coating reaches Ra3.2, and the impeller corrosion-resistant coating is prepared, and the thickness of the coating is 420 mu m.
Example 3
The turbine impeller (2 Cr13 steel, 6m diameter) coating can be prepared into an impeller corrosion-resistant coating with a thickness of 450 μm by the same procedure as that of example 2 without heat treatment due to high operating temperature.
Table 1 comparative performance of corrosion resistant coating of impeller of the present invention
Table 1 shows that the impeller corrosion-resistant coating prepared by the invention has high bonding strength, low porosity, high microhardness and good corrosion resistance, and can effectively prolong the service life of the impeller substrate.
Fig. 2 is a microscopic morphology of the impeller corrosion-resistant coating powder prepared in example 1 of the present invention, which is a spherical powder.
Fig. 3 is an SEM photograph of the impeller corrosion-resistant coating prepared in example 1 of the present invention, and it can be seen from the figure that the impeller corrosion-resistant coating prepared in the present invention has uniform thickness and structure, and good bonding with the substrate.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.
Claims (8)
1. An impeller corrosion resistant coating powder comprising: cr: 15-20 wt%; mo: 15-20 wt%; co:1 to 5 weight percent; cu:1 to 5 weight percent; w:1 to 4 weight percent; nb:1 to 3 weight percent; al:0.5 to 2 weight percent; ti:0.5 to 2 weight percent; rare earth oxide: 0.1-2 wt% and the balance of Ni;
the rare earth oxide comprises La 2 O 3 、Y 2 O 3 、CeO 2 、Er 2 O 3 At least one of (a) and (b); the content of the impurity element C is less than or equal to 0.01wt%; s content is less than or equal to 0.001wt%; the P content is less than or equal to 0.03wt%; the N content is less than or equal to 0.03wt%;
the impeller corrosion-resistant coating powder is prepared by adopting an atomization technology; the impeller corrosion-resistant coating powder is spherical; the particle size range of the impeller corrosion-resistant coating powder is 5-45 mu m, the impeller corrosion-resistant coating powder consists of fine powder with the particle size range of 5-25 mu m and coarse powder with the particle size range of 25-45 mu m, and the proportion of the fine powder to the coarse powder in the impeller corrosion-resistant coating powder is 10-90 wt%: 90-10 wt%.
2. The impeller corrosion resistant coating powder of claim 1, further comprising at least one of the Fe, mn, V, zr, ta, re, hf, B, si elements, the sum of which is no more than 5wt%; ni/(al+ti) =10 to 50.
3. The impeller corrosion resistant coating powder of claim 1, wherein said atomization technique comprises at least one of plasma atomization, melting vacuum/gas atomization, rotary centrifugal atomization, ultrasonic atomization.
4. The preparation method of the impeller corrosion-resistant coating is characterized by comprising the following steps of:
(1) Carrying out sand blasting treatment on the surface of the impeller, and cleaning;
(2) Spraying the impeller corrosion-resistant coating powder of any one of claims 1-3 on the surface of the impeller cleaned in the step (1) by adopting a supersonic flame spraying process to form a coating;
(3) Heat treating the coating in step (2);
(4) And (3) polishing the coating subjected to the heat treatment in the step (3) to obtain the impeller corrosion-resistant coating.
5. The method for producing an impeller corrosion resistant coating according to claim 4, wherein in said step (1), said blast-treated blast material comprises at least one of pure alumina, brown alumina, quartz sand, and silicon carbide; the grain diameter of the spray material is 30-80 meshes; the pressure of the sand blasting treatment is 0.5-1 Mpa, the time of the sand blasting treatment is 5-120 min, the sand blasting angle of the sand blasting treatment is 30-60 degrees, and the sand blasting distance of the sand blasting treatment is 50-350 mm; the cleanliness of the surface of the impeller after being cleaned in the step (1) is more than Sa2.5 grade, and the roughness is more than Ra6.3.
6. The method of claim 4, wherein in the step (2), the process parameters of the supersonic flame spraying process are as follows: the oxygen flow is 1500-2500 SCFH, the aviation kerosene flow is 5-10 GPH, the spraying distance is 200-400 mm, the compressed air flow is 10-30 SCFH, the powder feeding amount is 40-150 g/min, the spraying linear velocity is 10-30 m/min, the pressure of a spray gun combustion chamber is 80-150 PSI, and the combustion air flow velocity is more than 1000 m/s; the temperature of the spraying position of the impeller is monitored online during the spraying process; the on-line monitoring is to monitor the temperature of the spraying position of the impeller on line by adopting a fixed four-point infrared thermometer, and the distance between the four infrared points is 50-100 mm; the initial temperature of the spraying position is not higher than 100 ℃.
7. The method for producing an impeller corrosion-resistant coating according to claim 4, wherein in the step (3), the heat treatment is a surface flame heat-spraying treatment, the outer flame temperature of the surface flame heat-spraying treatment is 100 to 600 ℃, the moving speed is 0.1 to 10m/min, the time of the surface flame heat-spraying treatment is 0.5 to 12 hours, or the heat treatment is an in-furnace heat treatment, the temperature of the in-furnace heat treatment is 100 to 600 ℃, and the time of the in-furnace heat treatment is 0.5 to 12 hours; in the step (4), the surface roughness of the impeller corrosion-resistant coating is Ra6.3 or less; the thickness of the impeller corrosion-resistant coating is 50-600 mu m.
8. An impeller corrosion resistant coating prepared by the method of any one of claims 4-7.
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