CN110923615A - Electrochemical impregnation modified damping wear-resistant coating and preparation method thereof - Google Patents
Electrochemical impregnation modified damping wear-resistant coating and preparation method thereof Download PDFInfo
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- 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
- C23C4/134—Plasma spraying
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- 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
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- 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
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- 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
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- 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
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- 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
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
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Abstract
The invention relates to the fields of thermal spraying technology and surface technology, in particular to an electrochemical infiltration modified damping wear-resistant coating and a preparation method thereof. The problems of high friction coefficient and high wear rate of the thermal spraying coating are solved. The invention provides an electrochemical infiltration modified damping wear-resistant coating, which comprises a thermal spraying coating, an electrochemical infiltration layer of soft metal in pores of the thermal spraying coating, and an electrochemical reduction layer of the soft metal covering the outermost surface of the thermal spraying coating. The soft metal in the micro pores can continuously diffuse to the surface of the coating under the action of frictional heat in the friction process to form a continuous soft metal film covering the surface of the thermal spraying coating, the soft metal film can reduce the adhesion between friction pairs, remarkably reduce the friction coefficient and the wear rate of the coating and prolong the service life of the thermal spraying coating.
Description
Technical Field
The invention relates to the fields of thermal spraying technology and surface technology, in particular to an electrochemical infiltration modified damping wear-resistant coating and a preparation method thereof.
Background
The development of mechanical manufacturing and sophisticated techniques is closely related to the maximum limit reached by the material's properties, but with the increasing working stresses and working temperatures to which the material is subjected, the material often fails due to wear before the limit of use is reached. In the United States, losses due to Wear were estimated to be $ 200 billion in 1985 (Budinski KG. surface Engineering for Wear Resistance. (Retroactive Coverage) [ J ]. Prentice-Hall, Inc., Englewood Cliffs, New Jersey 07632, United States,1988.420,1988.) if losses due to Wear and corrosion were summed together, it was estimated to be $ 2000 billion (Bernecki T.F. ceramic industry 1989,10: 39.). In Germany, experts estimate that annual losses due to wear and corrosion account for approximately 5% of the total value of social production (Lugscheideder E., proc. of the nat. thermal SprayConf. Florida. USA.1987: 105.). Professor Vogelpohl in germany predicts that 1/3 to 1/2 losses of energy produced worldwide are on frictional wear (Fuller D. theory and practice of pollution for engineers [ M ]. New York: Wiley,1956.) professor h.p. jost in the united kingdom indicates that 30% to 40% of the energy consumed worldwide is on frictional wear (european union. reasonable lubrication technical manual [ M ]. oil industry press, 1993.). Therefore, the exploration of methods and technologies for reducing and preventing abrasion and corrosion has great social significance and economic benefit.
The thermal spraying coating has been widely used due to its excellent wear resistance, and the preparation techniques of the general coating include supersonic flame spraying, explosion spraying, plasma spraying, flame spraying or electric arc spraying. The principle is that the material is instantly heated to a molten or semi-molten state under the action of a heat source, and is sprayed on the surface of a roughened clean part at a high speed to generate plastic deformation, so that the plastic deformation is adhered to the surface of the part. The molten drops are mutually hooked by means of plastic deformation, so that a well-combined layered coating is obtained. But the use performance of the coating is seriously influenced by the influence of the characteristics of the thermal spraying process and the defects of more internal cracks, weak binding force, low compactness and the like of the thermal sprayed coating. And the wear-resistant coating is generally high in hardness, so that a severe cutting effect is generated on a mating part, and the wear loss is indirectly increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the thermal spraying coating has high friction coefficient and high wear rate. The invention provides an electrochemical infiltration modified damping wear-resistant coating, which is low in cost and simple in preparation method, soft metal elements are infiltrated into microscopic pores of a thermal spraying coating by using an electrochemical method and fill the pores, the soft metal in the microscopic pores can be continuously diffused to the surface of the coating under the action of frictional heat in a friction process, a continuous soft metal film is formed on the surface of the thermal spraying coating, the film can effectively work for a long time and reduce the adhesion between friction pairs, the friction coefficient and the wear rate of the coating can be remarkably reduced, the service life of the thermal spraying coating is prolonged, and a new idea is provided for expanding the application field of the thermal spraying coating.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides an electrochemical infiltration modified damping wear-resistant coating, which comprises a thermal spraying coating, an electrochemical infiltration layer of soft metal in pores of the thermal spraying coating, and a soft metal electrochemical reduction layer covering the outermost layer of the thermal spraying coating.
Specifically, the thickness of the thermal spray coating is 300 μm, and the porosity is 5-30%.
Specifically, the thermal spraying coating is formed by thermal spraying of a ceramic material or a composite material;
specifically, the average particle size of the ceramic material or composite material is 15 to 45 μm.
Specifically, the ceramic material is TiO2、Al2O3、Cr2O3、ZrO2NiO, WC, TiC or Cr2C3；
Specifically, the composite material is WC-Co,Cr2C3-NiCr, NiCrBSi, NiAl or Al2O3-TiO2。
Specifically, the soft metal is Cu, Zn, Al, Ag, Ti or Ni.
A preparation method of an electrochemical infiltration modified damping wear-resistant coating comprises the following steps:
(1) carrying out sand blasting pretreatment on the surface of the metal base material, and carrying out thermal spraying on the surface of the metal base material by taking a ceramic material, a metal material or a composite material as a thermal spraying raw material within 2 hours after the pretreatment to form a thermal spraying coating;
(2) polishing and polishing the thermal spraying coating to a specific roughness, and then cleaning and drying the thermal spraying coating;
(3) using a metal substrate covered with the thermal spraying coating as a cathode, using a soft metal as an anode, and impregnating the soft metal into the micro pores of the thermal spraying coating by adopting an electrochemical method to fill the micro pores and cover the surface of the coating, wherein the reaction conditions of the electrochemical method are as follows:
the electrochemical infiltration is carried out at 25-60 ℃, the pH of the electrolyte is 2-7, the concentration of the electrolyte in the electrolyte is 150-250g/L, and the current used for the electrochemical infiltration is 10-20mA/cm2The infiltration time is 8-20 minutes, and the magnetic stirrer is adopted for stirring in the electrochemical infiltration process, and the rotating speed is 100-; the electrolyte is a soluble salt solution of soft metal ions.
Specifically, the thermal spraying method is supersonic flame spraying, explosion spraying, plasma spraying, flame spraying or electric arc spraying.
Specifically, the thermal spraying method in the step (1) is a plasma spraying method, and the spraying parameters are as follows: the pressure of the main gas and the auxiliary gas is 0.2-0.5MPa and 0.1-0.3MPa respectively, and the flow rate is 20-50slpm and 2-6slpm respectively; the pressure of the powder feeding gas is 0.05-0.1MPa, the flow is 2-4slpm, and the powder feeding speed is 20-150 g/min; the current is 450-750A, the voltage is 50-70V, and the spraying distance is 100-150mm in the spraying process.
Specifically, the thermal spraying method in the step (1) is a supersonic flame spraying methodThe spraying parameters are as follows: combustion-supporting gas O2The pressure of the fuel gas propane and the pressure of the compressed air are respectively 1MPa, 0.6MPa and 0.7MPa, the flow rate is respectively 240slpm, 70slpm and 380slpm, and the powder feeding gas N2The flow rate was 15slpm, the powder delivery rate was 120g/min and the spray distance was 250 mm.
Specifically, the roughness described in step (2) is Ra ═ 0.3 to 2 μm.
The invention has the beneficial effects that:
(1) the coating prepared by the invention has the comprehensive advantages of friction reduction and wear resistance, can keep lower friction coefficient and wear rate for a long time, prolongs the service life of the thermal spraying coating, and provides a new idea for expanding the application field of the thermal spraying coating.
(2) The preparation method of the coating is a conventional preparation method in the field, and has the advantages of relatively simple required equipment and process, easy operation, higher production efficiency, no pollution in the production process and wide industrialization prospect.
Drawings
FIG. 1: BEI diagrams of the surface and cross-section of the WC-Co/Cu coating in inventive example 1 and the WC-Co coating in comparative example 1 and the corresponding elemental distribution diagrams: (a) the surface of the WC-Co coating, (b) the surface of the WC-Co/Cu coating, (c) the cross section of the WC-Co/Cu coating, (d) the Cu element distribution diagram corresponding to (c), (e) the W element distribution diagram corresponding to (c), and (f) the Co element distribution diagram corresponding to (c).
FIG. 2: the graphs of the friction coefficient with respect to the friction time for the WC-Co coating (a) prepared in comparative example 1 and the WC-Co/Cu coating (b) prepared in example 1 according to the present invention.
FIG. 3: the surface of the WC-Co/Cu coating in the embodiment 1 of the invention after the friction test is (a) in SEM appearance, and (b) in Cu element distribution diagram corresponding to (a).
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
The electrochemical infiltration modified thermal spraying antifriction wear-resistant coating prepared by the method is characterized by utilizing a Scanning Electron Microscope (SEM) and an energy spectrometer (EDS).
The friction performance test method of the coating is as follows:
a UMT multifunctional friction and wear tester and a ball-disc contact mode are adopted to carry out a friction and wear test. The counter grinding ball used in the test was a 302 stainless steel ball with a diameter of 4mm and a hardness of RC 39. Experimental parameters used in the experiment: the positive pressure is 10N, the sliding linear velocity is 0.5m/s, the friction time is 20min, and the friction stroke is 600 m.
The friction coefficient is directly read by a friction device, the cross section area of a grinding mark is measured by a surface profiler, the wear volume is obtained by multiplying the cross section area by the circumference of the grinding mark, the wear rate is calculated by the following formula, and the friction coefficient and the wear rate value are average values of 5 repeated experiments.
In the formula: w is the wear rate; Δ V — abrasion volume; f, positive pressure; l-friction stroke.
Example 1
(1) Taking an A3 low-carbon steel plate as a thermal spraying base material, taking WC-Co powder as a thermal spraying raw material, wherein the average particle size of the WC-Co powder is 15-45 mu m, the size of WC grains is 200-800 nm, the content of Co is 12 wt.%, and performing sand blasting pretreatment on the surface of the spraying base material by using SiC sand grains;
within 2h after pretreatment, performing thermal spraying on the surface of the A3 low-carbon steel plate by adopting an atmospheric plasma thermal spraying method, wherein argon is used as main gas, hydrogen is used as auxiliary gas, and the gas flow rates of the argon and the hydrogen are respectively 50slpm and 3 slpm; argon is used as powder feeding gas, the flow rate of the powder feeding gas is 4slpm, and the powder feeding speed is 150 g/m; the current adopted in the thermal spraying process is 500A, the voltage is 55V, the spraying distance is 110mm, WC-Co powder is sprayed on the surface of an A3 low-carbon steel plate to form a WC-Co thermal spraying coating, the thickness of the WC-Co thermal spraying coating is 300 mu m, and the porosity is 5%;
(2) the WC-Co coating uses Al with different grain diameters in turn2O3The abrasive was subjected to surface grinding and polished with a diamond grinding paste to a surface roughness Ra of 0.5 μm, and then the WC — Co thermal spray coating was cleaned with acetone and air-dried.
(3) With WC-Co heatThe low carbon steel plate sprayed with the coating is taken as a cathode, a copper sheet is taken as an anode, and electrochemical infiltration treatment is carried out at 25 ℃. CuSO with the concentration of 230g/L is adopted4The solution was used as an electrolyte, the pH of the solution was adjusted to 2.5 with dilute sulfuric acid, and the impregnation current was 15mA/cm2The infiltration time is 15min, a magnetic stirrer is used for stirring in the electrochemical infiltration process, the rotating speed of magnetons is 300r/min, and the electrochemical infiltration modified damping wear-resistant coating WC-Co/Cu is obtained after the electrochemical infiltration treatment.
Example 2 differs from example 1 in that: the hot spraying raw material in the step (1) is Cr2C3-NiCr powder, Cr2C3-NiCr powder with an average particle size of 15-45 [ mu ] m, Cr2C3The surface roughness of the NiCr thermal spraying coating is Ra 0.3 mu m, the porosity is 15 percent, and the electrochemical infiltration modified shock absorption wear-resistant coating Cr is obtained after electrochemical infiltration treatment2C3-NiCr/Cu。
Example 3 differs from example 1 in that: the thermal spraying raw material in the step (1) is Al2O3Powder of Al2O3The powder has an average particle size of 15 to 45 [ mu ] m and Al2O3The surface roughness of the thermal spraying coating is Ra 1 mu m, the porosity is 20 percent, and the damping wear-resistant coating Al modified by electrochemical infiltration is obtained after the electrochemical infiltration treatment2O3/Cu。
Example 4 differs from example 1 in that: the hot spraying raw material in the step (1) is Cr2O3Powder of Cr2O3The average particle size of the powder is 15-45 mu m, Cr2O3The surface roughness of the thermal spraying coating is Ra 2 mu m, the porosity is 30 percent, and the damping wear-resistant coating Cr modified by electrochemical infiltration is obtained after the electrochemical infiltration treatment2O3/Cu。
Example 5 differs from example 1 in that: the electrochemical impregnation electrolyte in the step (3) is NiSO4And performing electrochemical infiltration treatment on the solution to obtain the electrochemical infiltration modified damping wear-resistant coating WC-Co/Ni.
Example 6 differs from example 1 in that: step (1)The thermal spraying method in the (1) is supersonic flame spraying, and the spraying parameters are as follows: combustion-supporting gas O2The pressure of the fuel gas propane and the pressure of the compressed air are respectively 1MPa, 0.6MPa and 0.7MPa, the flow rate is respectively 240slpm, 70slpm and 380slpm, and the powder feeding gas N2The flow is 15slpm, the powder conveying rate is 120g/min, the spraying distance is 250mm, and the electrochemical infiltration modified damping wear-resistant coating WC-Co/Cu is obtained after electrochemical infiltration treatment.
Example 7 differs from example 1 in that: and (4) the concentration of the electrolyte in the step (3) is 250g/L, the pH value of the solution is 5, and the electrochemical impregnation modified damping wear-resistant coating WC-Co/Cu is obtained after the electrochemical impregnation treatment.
Example 8 differs from example 1 in that: the current for electrochemical infiltration in the step (3) is 20mA/cm2The infiltration time is 8 minutes, and the electrochemical infiltration modified damping wear-resistant coating WC-Co/Cu is obtained after electrochemical infiltration treatment.
Comparative example 1 differs from example 1 in that: the thermal spray coating is not subjected to electrochemical infiltration treatment.
Comparative example 2 differs from example 2 in that: the thermal spray coating is not subjected to electrochemical infiltration treatment.
Comparative example 3 differs from example 3 in that: the thermal spray coating is not subjected to electrochemical infiltration treatment.
Comparative example 4 differs from example 4 in that: the thermal spray coating is not subjected to electrochemical infiltration treatment.
FIG. 1 is a BEI diagram of the surface and cross-section of a WC-Co coating prepared in comparative example 1 and a WC-Co/Cu coating prepared in example 1 by the present method and their corresponding element distribution diagrams, and it is clear from the images and the test results that Cu element enters the micropores of the thermal spray coating of WC-Co/Cu coating prepared in example 1 by the present method through electrochemical infiltration.
FIG. 2 is a graph showing the change of the friction coefficient with the friction time of the WC-Co coating prepared in comparative example 1 and the WC-Co/Cu coating prepared in example 1 of the present invention, and the experimental results show that the friction coefficient of the WC-Co/Cu coating prepared in example 1 of the present invention is significantly lower than that of comparative example 1.
FIG. 3 shows that (a) of the surface of the WC-Co/Cu coating prepared in example 1 of the invention after the rubbing experiment is SEM morphology, and (b) is a Cu element distribution diagram corresponding to (a), and the experimental result shows that the surface of the WC-Co/Cu coating after the rubbing experiment is covered with a very thin copper film.
And (3) testing the wear resistance: the results of the weight loss by friction and coefficient of friction tests for the coatings prepared in examples 1-8 and comparative examples 1-4 are shown in table 1:
TABLE 1
The embodiment 1-8 of the invention is the thermal spraying coating modified by electrochemical infiltration, the comparative example 1-4 is the thermal spraying coating not modified by electrochemical infiltration, and the tribology performance test data in the table 1 shows that the friction coefficient and the wear rate of the coating modified by electrochemical infiltration are obviously reduced, and the coating has the comprehensive advantages of friction reduction and wear resistance.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The electrochemical infiltration modified damping wear-resistant coating is characterized by comprising a thermal spraying coating, an electrochemical infiltration layer of soft metal in pores of the thermal spraying coating and a soft metal electrochemical reduction layer covering the outermost layer of the thermal spraying coating.
2. The electrochemical impregnation modified shock absorption wear-resistant coating as claimed in claim 1, wherein: the thickness of the thermal spraying coating is 300 mu m, and the porosity is 10-30%.
3. The electrochemical impregnation modified shock absorption wear-resistant coating as claimed in claim 1, wherein: the thermal spraying coating is formed by thermal spraying of ceramic materials or composite materials;
the average grain diameter of the ceramic material or the composite material is 15-45 μm.
4. The electrochemical impregnation modified shock absorption wear-resistant coating as claimed in claim 3, wherein:
the ceramic material is TiO2、Al2O3、Cr2O3、ZrO2NiO, WC, TiC or Cr2C3；
The composite material is WC-Co, Cr2C3-NiCr, NiCrBSi, NiAl or Al2O3-TiO2。
5. The electrochemical impregnation modified shock absorption wear-resistant coating as claimed in claim 1, wherein: the soft metal is Cu, Zn, Al, Ag, Ti or Ni.
6. The preparation method of the electrochemical infiltration modified damping wear-resistant coating is characterized by comprising the following steps:
(1) carrying out sand blasting pretreatment on the surface of the metal base material, and carrying out thermal spraying on the surface of the metal base material by taking a ceramic material or a composite material as a thermal spraying raw material within 2 hours after the pretreatment to form a thermal spraying coating;
(2) polishing and polishing the thermal spraying coating to a specific roughness, and then cleaning and drying the thermal spraying coating;
(3) using a metal substrate covered with the thermal spraying coating as a cathode, using a soft metal as an anode, and impregnating the soft metal into the micro pores of the thermal spraying coating by adopting an electrochemical method to fill the micro pores and cover the surface of the coating, wherein the reaction conditions of the electrochemical method are as follows:
the electrochemical infiltration is carried out at the temperature of 25-60 ℃, the pH of the electrolyte is =2-7, the concentration of the electrolyte in the electrolyte is 150-250g/L, and the current used for the electrochemical infiltration is 10-20mA/cm2The infiltration time is 8-20 minutes, and the magnetic stirrer is adopted for stirring in the electrochemical infiltration process, and the rotating speed is 100-;
the electrolyte is a soluble salt solution of soft metal ions.
7. The preparation method of the electrochemical infiltration modified shock absorption wear-resistant coating according to claim 6, wherein the preparation method comprises the following steps: the thermal spraying method is supersonic flame spraying, explosion spraying, plasma spraying, flame spraying or electric arc spraying.
8. The preparation method of the electrochemical infiltration modified shock absorption wear-resistant coating according to claim 6, wherein the preparation method comprises the following steps: the thermal spraying method in the step (1) is a plasma spraying method, and the spraying parameters are as follows: the pressure of the main gas and the auxiliary gas is 0.2-0.5MPa and 0.1-0.3MPa respectively, and the flow rate is 20-50slpm and 2-6slpm respectively; the pressure of the powder feeding gas is 0.05-0.1MPa, the flow is 2-4slpm, and the powder feeding speed is 20-150 g/min; the current is 450-750A, the voltage is 50-70V, and the spraying distance is 100-150mm in the spraying process.
9. The preparation method of the electrochemical infiltration modified shock absorption wear-resistant coating according to claim 6, wherein the preparation method comprises the following steps: the thermal spraying method in the step (1) is a supersonic flame spraying method, and the spraying parameters are as follows: combustion-supporting gas O2The pressure of the fuel gas propane and the pressure of the compressed air are respectively 1MPa, 0.6MPa and 0.7MPa, the flow rate is respectively 240slpm, 70slpm and 380slpm, and the powder feeding gas N2The flow rate was 15slpm, the powder delivery rate was 120g/min and the spray distance was 250 mm.
10. The preparation method of the electrochemical infiltration modified shock absorption wear-resistant coating according to claim 6, wherein the preparation method comprises the following steps: the roughness described in step (2) is Ra =0.3-2 μm.
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| CN114836746A (en) * | 2022-03-28 | 2022-08-02 | 江苏珀然股份有限公司 | Preparation process of gradient coating on surface of automobile hub |
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| CN114836746A (en) * | 2022-03-28 | 2022-08-02 | 江苏珀然股份有限公司 | Preparation process of gradient coating on surface of automobile hub |
| CN114836746B (en) * | 2022-03-28 | 2023-11-21 | 江苏珀然股份有限公司 | Preparation process of gradient coating on surface of automobile hub |
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