CN112609142B - Anticorrosive wear-resistant composite coating on surface of sucker rod and preparation method thereof - Google Patents
Anticorrosive wear-resistant composite coating on surface of sucker rod and preparation method thereof Download PDFInfo
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- CN112609142B CN112609142B CN202011403159.XA CN202011403159A CN112609142B CN 112609142 B CN112609142 B CN 112609142B CN 202011403159 A CN202011403159 A CN 202011403159A CN 112609142 B CN112609142 B CN 112609142B
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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
- C23C4/04—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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- 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
- C22C19/007—Alloys based on nickel or cobalt with a light metal (alkali metal Li, Na, K, Rb, Cs; earth alkali metal Be, Mg, Ca, Sr, Ba, Al Ga, Ge, Ti) or B, Si, Zr, Hf, Sc, Y, lanthanides, actinides, as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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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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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses an anticorrosion wear-resistant composite coating on the surface of a sucker rod and a preparation method thereof, the method adjusts the components of alloy powder for powder spraying, so that a spray welding layer on the surface of the sucker rod, which is finally prepared by powder spraying, mainly contains elements such as Ni, cr, mo, B, si, W and the like, wherein the Ni and the Cr can provide good corrosion resistance; mo and W can effectively improve the high-temperature stability, corrosion resistance and wear resistance of the spray welding layer; B. si can effectively improve the fluidity of the melt in the spray welding process and improve the compactness of the spray welding layer. After powder spraying, the sprayed powder can be better combined with the base body of the sucker rod through remelting treatment, the wear resistance and corrosion resistance effects of the whole sucker rod are improved, multiple times of powder spraying and remelting treatment are repeatedly carried out, and finally formed welding layers are guaranteed to meet the design and use requirements.
Description
[ technical field ] A
The invention belongs to the technical field of material surfaces, and particularly relates to an anticorrosive wear-resistant composite coating for the surface of a sucker rod and a preparation method thereof.
[ background ] A method for producing a semiconductor device
In oil exploitation, oil extraction by a sucker rod pump of an oil pumping unit is a quite widely applied oil extraction method at home and abroad at present. In the process of the sucker-rod pump working, the sucker rod and the oil pipe are inevitably rubbed at the same position due to various reasons, such as the bending of the sucker rod caused by well deviation, the bending of the oil pipe caused by internal pressure and the like. The friction times are high, the stroke times of the sucker rod pump are calculated according to 6-7 times/minute, the friction between the sucker rod and the oil pipe is up to 9300 times every day, and the friction occurs at the same part.
In addition, natural gas contains not only H 2 S, further contains CO 2 When corrosive gas is equal, due to H 2 S、CO 2 Double influence on metallic materials and H 2 S、CO 2 Interaction between gases, coupled with high concentration of Cl downhole - And the corrosion problem of the sucker rod in the complex multi-phase medium system becomes abnormal serious and complex under the high-temperature and high-pressure environment, so that failure accidents often occur, and huge economic loss and potential safety hazards are brought to an oil field.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provides a surface anticorrosion and wear-resistant treatment method for a sucker rod, so as to solve the problems that the sucker rod is easy to corrode and failure accidents are easy to occur.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the anti-corrosion wear-resistant composite coating on the surface of the sucker rod comprises a mutual diffusion layer, a Ni-based anti-corrosion alloy layer and a mixed oxide wear-resistant layer from inside to outside in sequence.
The invention is further improved in that:
preferably, the inter-diffusion layer contains Fe, ni, al and Si elements, and the thickness of the inter-diffusion layer is 10-30 micrometers.
Preferably, the Ni-based corrosion-resistant alloy layer is composed of three phases of NiAl, feSi and Ni, and the thickness of the Ni-based corrosion-resistant alloy layer is 300-800 microns.
Preferably, the mixed oxide wear-resistant layer is made of SiO 2 -Al 2 O 3 And (4) forming.
A preparation method of an anticorrosive wear-resistant composite coating on the surface of a sucker rod comprises the following steps:
step 1, preparing alloy powder, wherein the alloy powder comprises the following components in percentage by mass: al:12.0-15.0%, B:2.0-3.0%, si:6.0-8.0%, re:1.0-2.0%, mo:1.0-2.0%, fe:8.0 to 10.0%, ni: the balance;
step 2, preheating the sucker rod;
step 3, performing powder spraying treatment on the preheated sucker rod, wherein the powder is the alloy powder prepared in the step 1, performing remelting treatment after powder spraying, and repeating powder spraying and remelting for 2-4 times to obtain a process sucker rod;
step 4, performing heat preservation and slow cooling on the process sucker rod, and finally cooling to room temperature;
and 5, carrying out heat treatment on the sucker rod, cooling the sucker rod to room temperature in the air, and finishing the preparation of the anticorrosive wear-resistant composite coating on the surface of the sucker rod.
Preferably, in step 1, the mixed powder is ground to obtain alloy powder of 250-350 meshes for powder spraying.
Preferably, in the step 2, before the sucker rod is preheated, sand blasting and rust removing pretreatment is carried out on the sucker rod, and the surface roughness of the pretreated sucker rod is 40-80 mu m and is free of oxidation and corrosion;
in step 2, the temperature of the preheated sucker rod is 300 ℃.
Preferably, in the step 3, the powder spraying treatment is to uniformly spray the alloy powder prepared in the step 1 on the surface of the preheated sucker rod, and 2 to 3 layers of powder are sprayed, wherein the thickness of each layer is 0.1 to 0.2mm; remelting treatment is carried out after powder spraying is finished;
the powder spraying gas is a mixed gas of oxygen and acetylene, wherein the oxygen pressure is 0.5-0.6 MPa, and the oxygen flow is 1100-1200L/h; the acetylene pressure is 0.07-0.08 MPa, and the acetylene flow is 900-1000L/h;
the remelting gas is a mixed gas of oxygen and acetylene, wherein the oxygen pressure is 0.4-0.5 MPa, the acetylene pressure is 0.05-0.06 MPa, the oxygen flow is 1100-1200L/h, and the acetylene flow is 900-1000L/h; the remelting temperature is 950-1050 ℃;
preferably, in the step 4, the temperature is kept and the cooling is slowly carried out by covering perlite or asbestos cloth.
Preferably, the heat treatment temperature of the sucker rod is 400-450 ℃, and the time is 8h.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a corrosion-resistant and wear-resistant composite for the surface of a sucker rodThe coating has low density and low porosity, and is a multilayer protective structure. Wherein Ni can provide good corrosion resistance; mo can effectively improve the high-temperature stability, corrosion resistance and wear resistance of the coating; B. si can effectively improve the fluidity of the melt in the spray welding process and improve the compactness of the coating; re can improve the toughness and comprehensive performance of the coating. The inter-diffusion layer of the inner layer in the multilayer structure ensures the gradient transition between the coating and the substrate, and effectively improves the binding force between the coating and the substrate; the middle Ni-based corrosion-resistant alloy layer has excellent corrosion resistance and good wear resistance; the outer layer is made of continuous and compact SiO 2 -Al 2 O 3 The composition has excellent wear resistance.
The invention discloses a method for preparing an anticorrosion and wear-resistant composite coating on the surface of a sucker rod, which is characterized in that the method comprises the steps of adjusting the components of alloy powder and regulating and controlling a spraying process, and carrying out remelting treatment after powder spraying, so that the sprayed powder can be better combined with a sucker rod substrate, the abrasion resistance and corrosion resistance effects of the whole sucker rod are improved, the powder spraying and remelting treatment are repeatedly carried out for many times, and the compactness of the coating is further improved. The final heat treatment forms a mutual diffusion layer with a certain thickness on the interface of the coating and the substrate to improve the binding force on the one hand, and forms continuous and compact SiO on the surface of the coating on the other hand 2 -Al 2 O 3 And the mixed layer further improves the wear resistance of the coating.
[ detailed description ] A
The invention provides a method for preparing an anticorrosive wear-resistant composite coating on the surface of a sucker rod by adopting an oxy-acetylene flame spray welding technology. The composite coating comprises a mutual diffusion layer, a Ni-based corrosion-resistant alloy layer and a mixed oxide wear-resistant layer from inside to outside in sequence. The interdiffusion layer contains Fe, ni, al, si and other elements, and the thickness is 10-30 microns; the Ni-based corrosion-resistant alloy layer mainly comprises three phases of NiAl, feSi and Ni, and the thickness of the Ni-based corrosion-resistant alloy layer is 300-800 micrometers; the mixed oxide wear-resistant layer is made of continuous and compact SiO 2 -Al 2 O 3 And (4) forming.
The preparation process comprises the following steps:
(1) Preparing alloy powder, wherein the alloy powder comprises the following components in percentage by mass: al:12.0-15.0%, B:2.0-3.0%, si:6.0-8.0%, re:1.0-2.0%, mo:1.0-2.0%, fe:8.0-10.0%, ni: the balance; mixing and grinding to obtain alloy powder with the granularity of 250-350 meshes;
(2) Surface pretreatment: carrying out sand blasting and rust removing treatment on the surface of the sucker rod, blowing the surface clean by compressed air, and after pretreatment, ensuring that the surface to be blasted is clean, the roughness is 40-80 mu m and no oxidation and corrosion exist;
(3) Surface preheating: uniformly preheating a sucker rod to 300 ℃;
(4) Powder spraying: the powder is evenly sprayed on the surface of the sucker rod layer by layer, the thickness of each layer is 0.1-0.2 mm, the number of layers is 2-3, and the spraying parameters are 0.5-0.6 MPa of oxygen, 0.07-0.08 MPa of acetylene, 900-1000L/h of acetylene gas flow and 1100-1200L/h of oxygen flow;
(5) Remelting: oxygen pressure of 0.4-0.5 MPa, acetylene pressure of 0.05-0.06 MPa and temperature of 950-1050 ℃;
(6) Repeating the processes of powder spraying and remelting for 2-4 times;
(7) Heat preservation and slow cooling: the perlite or the asbestos cloth is adopted for covering and heat preservation, and slow cooling after spraying is ensured, so that the welding layer does not generate a crack phenomenon in the remelting and cooling process.
(8) And (3) heat treatment: keeping the temperature at 400-450 ℃ for 8h, and then cooling the mixture to room temperature in air.
The invention adopts oxygen-acetylene flame to prepare a layer of anticorrosive and wear-resistant composite coating on a material substrate of a sucker rod. The preparation process comprises the following steps:
(1) Preparing alloy powder: according to the mass percentage, mixing the components of C:0.1-0.5%, cr:14.0-17.0%, B:2.0-3.0%, si:3.0-4.0%, W:4.0-6.0%, mo:8.0-10.0%, fe: less than or equal to 5.0 percent, ni: the balance, mixing and grinding to prepare alloy powder with the granularity of 250-350 meshes;
(2) Surface pretreatment: carrying out sand blasting and rust removing treatment on the surface of the sucker rod, blowing the surface by using compressed air, and after pretreatment, ensuring that the surface to be sprayed is clean, the surface roughness is 40-80 mu m, and no oxidation and rust are generated;
(3) Surface preheating: uniformly preheating a sucker rod to 300 ℃;
(4) Spraying powder, namely uniformly spraying the powder on the surface of a sucker rod layer by layer, wherein the thickness of each layer is 0.1-0.2 mm, the number of the sprayed layers is 2-3, and the spraying parameters are 0.5-0.6 MPa of oxygen, 0.07-0.08 MPa of acetylene, 900-1000L/h of acetylene gas flow and 1100-1200L/h of oxygen flow;
(5) The pressure of the oxygen remelted is 0.4-0.5 MPa, the pressure of the acetylene is 0.05-0.06 MPa, and the temperature is 950-1050 ℃;
(6) Repeating the processes of powder spraying and remelting for 2-4 times;
(7) Heat preservation and slow cooling: the perlite or the asbestos cloth is adopted for covering and heat preservation, and slow cooling after spraying is ensured, so that the welding layer does not generate a crack phenomenon in the remelting and cooling process.
Example 1
(1) Preparing alloy powder: mixing powder Al:13%, B:3.0%, si:7.0%, re:2.0%, mo:1.0%, fe:9.0 percent and the balance of Ni, and grinding the mixture to prepare alloy powder with the granularity of 250 to 350 meshes;
(2) Surface pretreatment: carrying out sand blasting and rust removing treatment on the surface of the sucker rod, blowing the surface by using compressed air, and after pretreatment, ensuring that the surface to be sprayed is clean, the roughness is 40-80 mu m and no oxidation and rust are generated;
(3) Surface preheating: uniformly preheating a sucker rod to 300 ℃;
(4) Powder spraying: the powder is evenly sprayed on the surface of the sucker rod layer by layer, the thickness of each layer is 0.1-0.2 mm, the number of layers is 2, and the spraying parameters are 0.6MPa of oxygen, 0.07MPa of acetylene, 1000L/h of acetylene gas flow and 1200L/h of oxygen gas flow;
(5) Remelting: the oxygen pressure is 0.4MPa, the acetylene pressure is 0.05MPa, the acetylene gas flow is 1000L/h, and the oxygen flow is 1200L/h; the temperature is 1050 ℃;
(6) Repeating the powder spraying and remelting processes for 4 times;
(7) Heat preservation and slow cooling: the perlite or the asbestos cloth is adopted for covering and heat preservation, and the sprayed layer is ensured to be slowly cooled, so that the welding layer does not generate crack phenomenon in the remelting and cooling process.
The surface hardness of the spray welding layer prepared by the method is more than 500HV, and the spray welding layer is in gas phase CO 2 Partial pressure of 2MPa and H 2 S is divided intoPressure 1.5MPa, solution Cl - The average corrosion rate after being corroded for 168 hours in aqueous solution with the concentration of 100g/L and the temperature of 140 ℃ is lower than 0.01mm/a.
Example 2
(1) Preparing alloy powder: mixing powder Al:12%, B:2.0%, si:6%, re:1.0%, mo:1.5%, fe:8.0 percent and the balance of Ni, and grinding the mixture to prepare alloy powder with the granularity of 250 to 350 meshes;
(2) Surface pretreatment: carrying out sand blasting and rust removing treatment on the surface of the sucker rod, blowing the surface by using compressed air, and after pretreatment, ensuring that the surface to be sprayed is clean, the roughness is 40-80 mu m and no oxidation and rust are generated;
(3) Surface preheating: uniformly preheating a sucker rod to 300 ℃;
(4) Powder spraying: uniformly spraying the powder on the surface of a sucker rod in a layered mode, wherein the thickness of each layer is 0.1-0.2 mm, the number of layers is 3, and the spraying parameters are that oxygen is 0.5MPa, acetylene is 0.08MPa, the flow of acetylene is 1000L/h, and the flow of oxygen is 1200L/h;
(5) Remelting: the oxygen pressure is 0.45MPa, the acetylene pressure is 0.06MPa, the temperature is 1000 ℃, the acetylene gas flow is 950L/h, and the oxygen flow is 1150L/h;
(6) Repeating the powder spraying and remelting processes for 3 times;
(7) Heat preservation and slow cooling: perlite and asbestos cloth are adopted for covering and heat preservation, and slow cooling after spraying is guaranteed, so that the welding layer does not crack in the remelting and cooling process.
Example 3
(1) Preparing alloy powder: mixing the powder Al:15%, B:2.5%, si:8%, re:1.5%, mo:2%, fe:10.0 percent of Ni and the balance of Ni are mixed and ground to prepare alloy powder with the granularity of 250 to 350 meshes;
(2) Surface pretreatment: carrying out sand blasting and rust removing treatment on the surface of the sucker rod, blowing the surface clean by compressed air, and after pretreatment, ensuring that the surface to be blasted is clean, the roughness is 40-80 mu m and no oxidation and corrosion exist;
(3) Surface preheating: uniformly preheating a sucker rod to 300 ℃;
(4) Powder spraying: uniformly spraying the powder on the surface of a sucker rod in a layered mode, wherein the thickness of each layer is 0.1-0.2 mm, the number of layers is 2, and the spraying parameters are that oxygen is 0.55MPa, acetylene is 0.075MPa, the flow rate of acetylene is 900L/h, and the flow rate of oxygen is 1100L/h;
(5) Remelting: the oxygen pressure is 0.48MPa, the acetylene pressure is 0.055MPa, the acetylene gas flow is 950L/h, and the oxygen flow is 1150L/h; the temperature is 950 ℃;
(6) Repeating the processes of powder spraying and remelting for 2 times;
(7) Heat preservation and slow cooling: perlite and asbestos cloth are adopted for covering and heat preservation, and slow cooling after spraying is guaranteed, so that the welding layer does not crack in the remelting and cooling process.
Example 4
(1) Preparing alloy powder: mixing powder Al:14%, B:2.2%, si:7%, re:1.0%, mo:2%, fe:8.0 percent and the balance of Ni, and grinding the mixture to prepare alloy powder with the granularity of 250 to 350 meshes;
(2) Surface pretreatment: carrying out sand blasting and rust removing treatment on the surface of the sucker rod, blowing the surface by using compressed air, and after pretreatment, ensuring that the surface to be sprayed is clean, the roughness is 40-80 mu m and no oxidation and rust are generated;
(3) Surface preheating: uniformly preheating a sucker rod to 300 ℃;
(4) Powder spraying: the powder is evenly sprayed on the surface of the sucker rod layer by layer, the thickness of each layer is 0.1-0.2 mm, the number of layers is 3, and the spraying parameters are 0.5MPa of oxygen, 0.07MPa of acetylene, 950L/h of acetylene gas flow and 1150L/h of oxygen gas flow;
(5) Remelting: the oxygen pressure is 0.42MPa, the acetylene pressure is 0.05MPa, the acetylene gas flow is 950L/h, and the oxygen flow is 1150L/h; the temperature is 980 ℃;
(6) Repeating the processes of powder spraying and remelting for 4 times;
(7) Heat preservation and slow cooling: perlite and asbestos cloth are adopted for covering and heat preservation, and slow cooling after spraying is guaranteed, so that the welding layer does not crack in the remelting and cooling process.
Example 5
(1) Preparing alloy powder: mixing the powder Al:14%, B:2.8%, si:6%, re:2.0%, mo:1%, fe:9.0 percent and the balance of Ni, and grinding the mixture to prepare alloy powder with the granularity of 250 to 350 meshes;
(2) Surface pretreatment: carrying out sand blasting and rust removing treatment on the surface of the sucker rod, blowing the surface by using compressed air, and after pretreatment, ensuring that the surface to be sprayed is clean, the roughness is 40-80 mu m and no oxidation and rust are generated;
(3) Surface preheating: uniformly preheating a sucker rod to 300 ℃;
(4) Powder spraying: uniformly spraying the powder on the surface of a sucker rod in a layered mode, wherein the thickness of each layer is 0.1-0.2 mm, the number of layers is 2, and the spraying parameters are that oxygen is 0.6MPa, acetylene is 0.08MPa, the flow rate of acetylene is 950L/h, and the flow rate of oxygen is 1130L/h;
(5) Remelting: the oxygen pressure is 0.45MPa, the acetylene pressure is 0.06MPa, the acetylene gas flow is 950L/h, and the oxygen flow is 1130L/h; the temperature is 1020 ℃;
(6) Repeating the processes of powder spraying and remelting for 3 times;
(7) Heat preservation and slow cooling: perlite and asbestos cloth are adopted for covering and heat preservation, and slow cooling after spraying is guaranteed, so that the welding layer does not crack in the remelting and cooling process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (5)
1. The preparation method of the anticorrosive wear-resistant composite coating on the surface of the sucker rod is characterized by comprising the following steps of:
step 1, preparing alloy powder, wherein the alloy powder comprises the following components in percentage by mass: al:12.0-15.0%, B:2.0-3.0%, si:6.0-8.0%, re:1.0-2.0%, mo:1.0-2.0%, fe:8.0 to 10.0%, ni: the balance;
step 2, preheating the sucker rod;
step 3, performing powder spraying treatment on the preheated sucker rod, wherein the powder is the alloy powder prepared in the step 1, performing remelting treatment after powder spraying, and repeating powder spraying and remelting for 2-4 times to obtain a process sucker rod;
the powder spraying treatment is to uniformly spray the alloy powder prepared in the step 1 on the surface of the preheated sucker rod for 2 to 3 layers, wherein the thickness of each layer is 0.1 to 0.2mm; remelting treatment is carried out after powder spraying is finished;
step 4, carrying out heat preservation and slow cooling on the process sucker rod, and finally cooling to room temperature;
step 5, carrying out heat treatment on the sucker rod, wherein the heat treatment temperature of the sucker rod is 400-450 ℃, and the time is 8h; and cooling the sucker rod surface to room temperature in the air, and finishing the preparation of the anticorrosive wear-resistant composite coating on the surface of the sucker rod, wherein the composite coating sequentially comprises an interdiffusion layer, a Ni-based corrosion-resistant alloy layer and a mixed oxide wear-resistant layer from inside to outside.
2. The method for preparing the anticorrosion wear-resistant composite coating on the surface of the sucker rod according to claim 1, wherein in the step 1, the mixed powder is ground to prepare alloy powder with 250-350 meshes for powder spraying.
3. The preparation method of the anticorrosion wear-resistant composite coating on the surface of the sucker rod according to claim 1, wherein in the step 2, the sucker rod is subjected to sand blasting rust removal pretreatment before the sucker rod is preheated, and the surface roughness of the pretreated sucker rod is 40-80 μm and is free of oxidation corrosion;
in step 2, the temperature of the preheated sucker rod is 300 ℃.
4. The method for preparing the anticorrosion wear-resistant composite coating on the surface of the sucker rod as claimed in claim 1, wherein in the step 3, the powder spraying gas is a mixed gas of oxygen and acetylene, wherein the oxygen pressure is 0.5 to 0.6MPa, and the oxygen flow is 1100 to 1200L/h; the acetylene pressure is 0.07 to 0.08MPa, and the acetylene flow is 900 to 1000L/h;
the remelting gas is a mixed gas of oxygen and acetylene, wherein the oxygen pressure is 0.4 to 0.5MPa, the acetylene pressure is 0.05 to 0.06MPa, the oxygen flow is 1100 to 1200L/h, and the acetylene flow is 900 to 1000L/h; the remelting temperature is 950 to 1050 ℃.
5. The method for preparing the anticorrosion and wear-resistant composite coating on the surface of the sucker rod according to claim 1, wherein in the step 4, perlite or asbestos cloth is covered for heat preservation and slow cooling.
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