An abradable coating to inhibit hydrate growth and a method of making the same

Abstract

The application discloses an abrasion-resistant coating for inhibiting growth of hydrate and a preparation method thereof, and belongs to the technical field of oil and natural gas transportation. The preparation method comprises the following steps: treating copper powder and graphene powder by adopting a ball milling method to obtain graphene / copper composite powder; preparing a graphene / copper porous coating on the surface of a base body by adopting a cold spraying method; modifying the surface of the graphene / copper porous coating by adopting an anodic oxidation method to obtain a coating with Cu2O / CuO composite oxides with nanometer strips on the surface; and performing impregnation treatment on the coating with Cu2O / CuO composite oxides with nanometer strips on the surface by adopting a low-surface-energy substance to obtain the abrasion-resistant coating for inhibiting growth of hydrate.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas transportation technology, specifically relating to a wearable coating that inhibits hydrate growth and its preparation method. Background Technology

[0002] Natural gas hydrates are hydrocarbon compounds with a solid density greater than that of a fluid. In oil and gas pipelines containing free water, hydrates can form on the inner walls of the pipeline when the pressure is sufficiently high or the temperature is sufficiently low. The nucleation, growth, and aggregation of hydrate particles within the pipeline can cause blockages in pipelines or valves, leading to direct economic losses or personal injury and affecting the safe operation of the pipeline.

[0003] Generally, methods for inhibiting hydrate blockage in oil and gas pipelines include physical and chemical methods. Physical methods alter the physical conditions for hydrate formation by increasing pipeline temperature or decreasing pressure, thus preventing hydrate formation. Chemical methods involve adding a certain amount of thermodynamic inhibitors and low-dose hydrate inhibitors to disrupt the phase equilibrium of hydrates, thereby preventing their formation. Physical methods are complex to operate, have stringent requirements on equipment and working conditions, and are not suitable for complex field operations. Chemical methods are problematic because the large consumption of thermodynamic inhibitors significantly increases production costs, and the inhibitors themselves are toxic; while low-dose hydrates, although used in small quantities, are expensive to prepare, difficult to adapt to complex pipeline compositions, and the nanoparticles can pollute the environment, thus failing to meet actual production needs. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing methods for inhibiting hydrate blockage in oil and gas pipelines, which are difficult to meet the actual production needs, the present invention aims to provide a wearable coating for inhibiting hydrate growth and its preparation method. The coating prepared by the present invention has superhydrophobic properties to prevent the generation and aggregation of hydrate particles on the pipe wall, thereby preventing hydrate blockage in the pipeline.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This invention provides a method for preparing a wearable coating that inhibits hydrate growth, comprising the following steps:

[0007] S1: Graphene powder and copper powder are processed by ball milling to obtain graphene / copper composite powder;

[0008] S2: A graphene / copper porous coating is prepared on the surface of a substrate using a cold spraying method with graphene / copper composite powder.

[0009] S3: The surface of the graphene / copper porous coating is modified by anodizing to obtain a coating with nano-strip-like Cu2O / CuO composite oxide on the surface;

[0010] S4: A wearable coating that inhibits hydrate formation is obtained by impregnating a coating with a low surface energy material on a Cu2O / CuO composite oxide coating with nano-strip-like structures.

[0011] Furthermore, in step S1, the ball milling method includes the following steps:

[0012] S01: Mix graphene powder and copper powder at a mass ratio of (0.5~1):100 to obtain a mixed powder;

[0013] S02: The mixed powder and zirconia balls are fed into a ball mill at a mass ratio of 1:100. Ethanol is added and the mixture is ball-milled. The zirconia balls are then removed to obtain a composite slurry.

[0014] S03: The composite slurry is then dried, crushed, and sieved to obtain graphene / copper composite powder.

[0015] Furthermore, in step S2, the thickness of the graphene / copper porous coating is 200–300 μm.

[0016] In a further embodiment of the present invention, in step S2, the working gas of the cold spraying method is nitrogen, the gas heating temperature of the cold spraying method is 260-550℃, the main gas pressure of the cold spraying method is 2-2.8MPa, the powder feeding rate of the cold spraying method is 1.5-2r / min, the spraying distance of the cold spraying method is 25-40mm, and the spray gun moving speed of the cold spraying method is 30-40mm / s.

[0017] Furthermore, the substrate is sandblasted before use.

[0018] Furthermore, in this invention, the sand particle size of the sandblasting treatment is 200-400 mesh; the spray angle of the sandblasting treatment is 45-70°; and the gas pressure of the sandblasting treatment is 0.5-0.8 MPa.

[0019] In a further step of this invention, in step S3, the electrolyte for anodic oxidation is a NaOH solution, and the current density for anodic oxidation is 1–10 mA·cm⁻¹. -2 The anodizing time is 20-30 minutes, and the anodizing temperature is 15-30℃.

[0020] In a further step of the present invention, in step S4, the low surface energy substance is one of stearic acid-ethanol solution, fluorosilane, or tetradecanoic acid.

[0021] In a further step of the present invention, in step S4, the impregnation treatment involves immersing the coating in a low surface energy material and drawing a vacuum, and then drying the coating after the low surface energy material has completely penetrated it.

[0022] The present invention provides a wearable coating for inhibiting hydrate growth prepared by any one of the methods described in the present invention.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention provides a method for preparing a wearable coating that inhibits hydrate growth. The method utilizes cold spraying technology to prepare a graphene / copper porous coating on a substrate surface, preventing oxidation of the material during coating preparation and avoiding performance loss due to substrate overheating. During cold spraying, copper powder in the graphene / copper composite powder undergoes plastic deformation after high-speed collisions, accumulating layer by layer through mechanical interlocking to form the coating. Because large-sized copper powder particles are not fully deformed during spraying, the layers stacked together form a porous copper coating. Fine graphene powder in the graphene / copper composite powder adheres to the surface of copper particles during powder preparation and remains at the coating interlayer interfaces and in the pores during spraying. Anodizing was used to treat the sample surface and control the morphology of the coating surface. When the nano-strip-shaped Cu₂O / CuO composite oxide on the coating surface was mechanically damaged, a rough oxide film could be regenerated through the galvanic cell reaction between copper and graphene. Stearic acid molecules within the coating could be adsorbed through molecular forces to reconstruct a hydrophobic surface structure, giving the coating abrasion resistance. Hydrophobic modification of the coating imparts a hydrophobic effect, effectively preventing water droplets from adsorbing onto the surface and thus preventing the formation of hydrates.

[0025] Furthermore, before cold spraying, the substrate is pretreated to change the surface roughness, roughen the substrate surface, remove surface contaminants, and thereby improve the adhesion between the coating and the substrate.

[0026] The wearable coating prepared by this invention, which inhibits hydrate growth, has a porous interior. Graphene adheres to the surface of copper particles, and a nanoscale oxide film is formed on the outer surface of the coating due to anodic oxidation. When the nanoscale oxide film on the coating surface is damaged by wear, the copper and graphene on the surface undergo a galvanic cell reaction in the corrosive medium, rapidly forming a nanoscale oxide film and regaining a nanoscale rough surface. Attached Figure Description

[0027] Figure 1 A schematic diagram of the surface structure of the wear-resistant coating that inhibits hydrate formation prepared according to an embodiment of the present invention;

[0028] Figure 2This is a schematic diagram of the surface micro / nano structure generated by the copper-graphene galvanic cell reaction in an embodiment of the present invention;

[0029] Figure 3 This is a surface morphology image of a sample after anodizing in an embodiment of the present invention;

[0030] Figure 4 This is a measurement diagram of the surface wetting angle after hydrophobic modification of the coating in an embodiment of the present invention.

[0031] Wherein: 1-matrix; 2-copper; 3-graphene; 4-nano copper oxide film; 5-corrosive medium inside the pipeline. Detailed Implementation

[0032] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0033] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0034] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0035] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0036] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0037] This invention provides a wearable coating for inhibiting hydrate growth and a method for preparing the same.

[0038] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0039] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0041] This invention employs a ball milling method to pre-prepare a mixed powder of copper and graphene. Copper powder, graphene powder, and zirconia balls are added to ethanol in a certain mass ratio, and then ball-milled to remove the zirconia balls to obtain a composite slurry. After drying, crushing, and sieving, graphene / copper composite powder is obtained.

[0042] A copper-graphene porous coating was prepared using a cold spraying method. This cold spraying technique prevents oxidation of the material during coating preparation and avoids performance loss caused by substrate overheating. Before cold spraying, the substrate is sandblasted to alter surface roughness and improve the bonding strength between the coating and the substrate. During spraying, copper powder undergoes plastic deformation upon high-speed collisions, accumulating layer by layer through mechanical interlocking to form the coating. Because large copper powder particles are not fully deformed during spraying, the stacked layers form a porous copper coating. Fine graphene powder adheres to the surface of copper particles during powder preparation and remains at the coating interlayer interfaces and in the pores during spraying.

[0043] The coating surface was modified by anodizing, i.e., anodizing was used to obtain nano-strip-shaped Cu2O / CuO composite oxide.

[0044] By impregnating the coating with a low surface energy material, a wearable coating that inhibits hydrate formation is obtained. In this invention, a stearic acid-ethanol solution is used to impregnate the coating, and finally a superhydrophobic coating that inhibits hydrate formation is obtained.

[0045] The low surface energy material is one of stearic acid-ethanol solution, fluorosilane, or tetradecanoic acid.

[0046] The method for preparing the wear-resistant coating that inhibits hydrate growth according to the present invention includes the following steps:

[0047] S1: Powder preparation: Graphene powder and copper powder (50-150μm) are weighed and mixed at a mass ratio of 0.5:100 to 1:100. The mixed powder and zirconia balls are weighed at a mass ratio of 1:100 and added to a ball mill. Ethanol is then added and the mixture is ball-milled to obtain a composite slurry. Finally, the composite slurry is dried, crushed and sieved to obtain graphene / copper composite powder.

[0048] S2: Substrate pretreatment: Use quartz sand with a particle size of 200-400 mesh, and use a spray gun at an angle of 45-70° and a pressure of 0.5-0.8MPa to sandblast the surface of X80 steel or other metals to roughen the substrate surface, remove surface contaminants, and thus improve the adhesion between the coating and the substrate.

[0049] S3: Coating Preparation: A porous copper-graphene composite coating was prepared on the substrate surface using cold spraying technology. The coating thickness was approximately 200–300 μm. The spraying process parameters were controlled as follows: nitrogen as the working gas, gas heating temperature of 260–550℃, main gas pressure of 2–2.8 MPa, powder feeding rate of 1.5–2 r / min, spraying distance of 25–40 mm, and spray gun moving speed of 30–40 mm / s.

[0050] S4: Coating surface morphology control: The sample surface was treated by anodizing to obtain nano-strip-shaped Cu2O / CuO composite oxide.

[0051] First, the treated substrate is connected to the positive terminal of the power supply as the anode, and high-purity titanium or other metal is connected to the negative terminal as the cathode. Then, the anode and cathode are immersed in the electrolytic cell. After the required temperature is reached, the current is slowly increased to the set value to start the anodizing process. After the time is up, the power is turned off and the electrodes are removed.

[0052] The electrolyte is a 3 mol / L NaOH solution, and the current density is 1–10 mA·cm⁻¹. -2 The time is 20-30 minutes, and the temperature is 15-30℃.

[0053] S5: Hydrophobic Modification of the Coating: The coating is immersed in a solution of stearic acid-ethanol, fluorosilane, or tetradecanoic acid, and then placed in a small vacuum chamber for 0.5–1 hour to allow the solution to completely penetrate the porous coating. It is then dried. Due to the hydrophobic effect of the coating, water droplets are prevented from adsorbing onto the surface, thus preventing the formation of hydrates on the coating surface.

[0054] S6: Regeneration of coating surface after wear: When the nanoscale oxide film on the coating surface is damaged due to wear, the copper and graphene on the surface undergo a galvanic cell reaction in the corrosive medium, rapidly forming a nanoscale oxide film and regaining a nanoscale rough surface. A wearable coating can be obtained by using the preparation method described in this invention.

[0055] Example 1

[0056] S1: Powder preparation: Graphene powder and copper powder (50-75μm) are weighed and mixed at a mass ratio of 0.5:100. The mixed powder and zirconia balls are weighed at a mass ratio of 1:100 and added to a ball mill. Ethanol is then added and the mixture is ball-milled to obtain a composite slurry. Finally, the composite slurry is dried, crushed and sieved to obtain graphene / copper composite powder.

[0057] S2: Substrate pretreatment: Use 200-mesh quartz sand and a spray gun at a 45° angle and 0.5MPa pressure to sandblast the X80 steel surface to roughen the substrate surface, remove surface contaminants, and thus improve the adhesion between the coating and the substrate.

[0058] S3: Coating Preparation: A porous copper-graphene composite coating was prepared on the substrate surface using cold spraying technology. The working gas for spraying was nitrogen, the gas heating temperature was 260℃, the main gas pressure was 2.8MPa, the powder feeding rate was 2r / min, the spraying distance was 30mm, the spray gun moving speed was 35mm / s, and the coating thickness was approximately 300μm.

[0059] S4: Coating Surface Morphology Control: The sample surface was treated with anodizing to obtain nano-strip-shaped Cu2O / CuO composite oxides. First, the treated substrate was connected to the positive terminal of a power supply as the anode, and high-purity titanium or other metal was connected to the negative terminal as the cathode. Then, the anode and cathode were immersed in an electrolytic cell containing a 3 mol / L NaOH solution. After the temperature reached 15℃, the current was slowly increased to the set value of 10 mA·cm. -2 Start the anodizing process, and after 30 minutes, turn off the power and remove the electrodes.

[0060] S5: Hydrophobic Modification of the Coating: The coating is immersed in a stearic acid-ethanol solution and placed in a small vacuum chamber for 1 hour to allow the solution to completely penetrate the porous coating. It is then dried. Due to the hydrophobic effect of the coating, water droplets are prevented from adsorbing onto the surface, thus preventing the formation of hydrates on the coating surface.

[0061] S6: Regeneration of coating surface after wear: When the nanoscale oxide film on the coating surface is damaged due to wear, the copper and graphene on the surface undergo a galvanic cell reaction in the corrosive medium, rapidly forming a nanoscale oxide film and regaining a nanoscale rough surface. A wearable coating can be obtained by using the preparation method described in this invention.

[0062] Example 2

[0063] S1: Powder preparation: Graphene powder and copper powder (100-150μm) are weighed and mixed at a mass ratio of 0.75:100. The mixed powder and zirconia balls are weighed at a mass ratio of 1:100 and added to a ball mill. Ethanol is then added and the mixture is ball-milled to obtain a composite slurry. Finally, the composite slurry is dried, crushed and sieved to obtain graphene / copper composite powder.

[0064] S2: Substrate pretreatment: Use 350-mesh quartz sand, and use a spray gun at a 70° angle and 0.5MPa pressure to sandblast the X80 steel surface to roughen the substrate surface, remove surface contaminants, and thus improve the adhesion between the coating and the substrate.

[0065] S3: Coating Preparation: A porous copper-graphene composite coating was prepared on the substrate surface using cold spraying technology. The working gas for spraying was nitrogen, the gas heating temperature was 550℃, the main gas pressure was 2.5MPa, the powder feeding rate was 2r / min, the spraying distance was 30mm, the spray gun moving speed was 40mm / s, and the coating thickness was approximately 300μm.

[0066] S4: Coating Surface Morphology Control: The sample surface was treated with anodizing to obtain nano-strip-shaped Cu2O / CuO composite oxides. First, the treated substrate was connected to the positive terminal of a power supply as the anode, and high-purity titanium or other metal was connected to the negative terminal as the cathode. Then, the anode and cathode were immersed in an electrolytic cell containing a 3 mol / L NaOH solution. After the temperature reached 20℃, the current was slowly increased to the set value of 9 mA·cm⁻¹. -2 Start the anodizing process, and after 25 minutes, turn off the power and remove the electrodes.

[0067] S5: Hydrophobic Modification of the Coating: The coating is immersed in a 0.5% (v / v) fluorosilane solution and placed in a small vacuum chamber for 0.75 hours to allow the solution to completely penetrate the porous coating. It is then dried. Due to the hydrophobic effect of the coating, water droplets are prevented from adsorbing onto the surface, thus preventing the formation of hydrates on the coating surface.

[0068] S6: Regeneration of coating surface after wear: When the nanoscale oxide film on the coating surface is damaged due to wear, the copper and graphene on the surface undergo a galvanic cell reaction in the corrosive medium, rapidly forming a nanoscale oxide film and regaining a nanoscale rough surface. A wearable coating can be obtained by using the preparation method described in this invention.

[0069] Example 3

[0070] S1: Powder preparation: Graphene powder and copper powder (70-100μm) are weighed and mixed at a mass ratio of 1:100. The mixed powder and zirconia balls are weighed at a mass ratio of 1:100 and added to a ball mill. Ethanol is then added and the mixture is ball-milled to obtain a composite slurry. Finally, the composite slurry is dried, crushed and sieved to obtain graphene / copper composite powder.

[0071] S2: Substrate pretreatment: Use 400-mesh quartz sand, and use a spray gun at a 50° tilt angle and 0.8MPa pressure to sandblast the X80 steel surface to roughen the substrate surface, remove surface contaminants, and thus improve the adhesion between the coating and the substrate.

[0072] S3: Coating Preparation: A porous copper-graphene composite coating was prepared on the substrate surface using cold spraying technology. The working gas for spraying was nitrogen, the gas heating temperature was 260℃, the main gas pressure was 2.8MPa, the powder feeding rate was 1.5r / min, the spraying distance was 40mm, the spray gun moving speed was 30mm / s, and the coating thickness was approximately 200μm.

[0073] S4: Coating Surface Morphology Control: The sample surface was treated with anodizing to obtain nano-strip-shaped Cu2O / CuO composite oxides. First, the treated substrate was connected to the positive terminal of a power supply as the anode, and high-purity titanium or other metal was connected to the negative terminal as the cathode. Then, the anode and cathode were immersed in an electrolytic cell containing a 3 mol / L NaOH solution. After the temperature reached 30℃, the current was slowly increased to the set value of 1 mA·cm⁻¹. -2 Start the anodizing process, and after 20 minutes, turn off the power and remove the electrodes.

[0074] S5: Hydrophobic Modification of the Coating: The coating is immersed in a 20 mol / L fluorosilane solution and placed in a small vacuum chamber for 0.5 h to allow the solution to completely penetrate the porous coating. It is then dried. Due to the hydrophobic effect of the coating, water droplets are prevented from adsorbing onto the surface, thus preventing the formation of hydrates on the coating surface.

[0075] S6: Regeneration of coating surface after wear: When the nanoscale oxide film on the coating surface is damaged due to wear, the copper and graphene on the surface undergo a galvanic cell reaction in the corrosive medium, rapidly forming a nanoscale oxide film and regaining a nanoscale rough surface. A wearable coating can be obtained by using the preparation method described in this invention.

[0076] Example 4

[0077] S1: Powder preparation: Graphene powder and copper powder (100-150μm) are weighed and mixed at a mass ratio of 0.75:100. The mixed powder and zirconia balls are weighed at a mass ratio of 1:100 and added to a ball mill. Ethanol is then added and the mixture is ball-milled to obtain a composite slurry. Finally, the composite slurry is dried, crushed and sieved to obtain graphene / copper composite powder.

[0078] S2: Substrate pretreatment: Use 350-mesh quartz sand, and use a spray gun at a 60° angle and a pressure of 0.5MPa to sandblast the X80 steel surface to roughen the substrate surface, remove surface contaminants, and thus improve the adhesion between the coating and the substrate.

[0079] S3: Coating Preparation: A porous copper-graphene composite coating was prepared on the substrate surface using cold spraying technology. The working gas for spraying was nitrogen, the gas heating temperature was 550℃, the main gas pressure was 2.8MPa, the powder feeding rate was 2r / min, the spraying distance was 25mm, the spray gun moving speed was 35mm / s, and the coating thickness was approximately 250μm.

[0080] S4: Coating Surface Morphology Control: The sample surface was treated with anodizing to obtain nano-strip-shaped Cu2O / CuO composite oxides. First, the treated substrate was connected to the positive terminal of a power supply as the anode, and high-purity titanium or other metal was connected to the negative terminal as the cathode. Then, the anode and cathode were immersed in an electrolytic cell containing a 3 mol / L NaOH solution. After the temperature reached 27℃, the current was slowly increased to the set value of 5 mA·cm⁻¹. -2 Start the anodizing process, and after 22 minutes, turn off the power and remove the electrodes.

[0081] S5: Hydrophobic Modification of the Coating: The coating is immersed in a molten tetradecanoic acid solution and placed in a small vacuum chamber for 0.75 hours to allow the solution to completely penetrate the porous coating. It is then dried. Due to the hydrophobic effect of the coating, water droplets are prevented from adsorbing onto the surface, thus preventing the formation of hydrates on the coating surface.

[0082] S6: Regeneration of coating surface after wear: When the nanoscale oxide film on the coating surface is damaged due to wear, the copper and graphene on the surface undergo a galvanic cell reaction in the corrosive medium, rapidly forming a nanoscale oxide film and regaining a nanoscale rough surface. A wearable coating can be obtained by using the preparation method described in this invention.

[0083] like Figure 1 The schematic diagram of the wearable coating surface structure that inhibits hydrate formation shows that the interior of the coating is porous, with graphene adhering to the surface of copper particles, and a nanoscale oxide film formed on the outer surface of the coating due to anodic oxidation.

[0084] like Figure 2 As shown in the schematic diagram of the copper-graphene galvanic cell reaction to generate surface micro-nano structures, when the nanoscale oxide film on the coating surface is damaged by wear, the copper and graphene on the surface undergo a galvanic cell reaction in the corrosive medium to rapidly form a nanoscale oxide film, thus regaining a nanoscale rough surface. A wearable coating can be obtained by using the preparation method described in this invention.

[0085] like Figure 3 The surface morphology of the sample after anodizing is shown. After anodizing, nano-strip-shaped Cu2O / CuO composite oxides are formed on the coating surface.

[0086] like Figure 4 The surface wetting angle measurement diagram after hydrophobic modification of the coating is shown. After hydrophobic modification, the contact angle of the coating reaches 158°, resulting in a superhydrophobic surface.

[0087] When the nano-strip-shaped Cu2O / CuO composite oxide on the surface is mechanically damaged, the oxide film on the rough surface can be regenerated by the galvanic cell reaction between copper and graphene. Stearic acid molecules in the coating can be adsorbed by molecular forces to reconstruct the hydrophobic surface structure, making the coating wear-resistant.

[0088] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for preparing a wearable coating that inhibits hydrate growth, characterized in that, Includes the following steps: S1: Graphene powder and copper powder are processed by ball milling to obtain graphene / copper composite powder; S2: A graphene / copper porous coating is prepared on the surface of a substrate by cold spraying graphene / copper composite powder. S3: The surface of the graphene / copper porous coating is modified by anodizing to obtain a coating with nano-strip-like Cu2O / CuO composite oxide on the surface; S4: A low surface energy material is used to impregnate a coating of Cu2O / CuO composite oxide with nano-stripes on the surface to obtain a hydrophobic wearable coating that inhibits the formation of hydrates. In step S4, the low surface energy substance is one of stearic acid-ethanol solution, fluorosilane, or tetradecanoic acid.

2. The method for preparing the wearable coating for inhibiting hydrate growth according to claim 1, characterized in that, In step S1, the ball milling method includes the following steps: S01: Mix graphene powder and copper powder at a mass ratio of (0.5~1):100 to obtain a mixed powder; S02: The mixed powder and zirconia balls are fed into a ball mill at a mass ratio of 1:

100. Ethanol is added and the mixture is ball-milled. The zirconia balls are then removed to obtain a composite slurry. S03: The composite slurry is then dried, crushed, and sieved to obtain graphene / copper composite powder.

3. The method for preparing the wearable coating for inhibiting hydrate growth according to claim 1, characterized in that, In step S2, the thickness of the graphene / copper porous coating is 200–300 μm.

4. The method for preparing the wearable coating for inhibiting hydrate growth according to claim 1, characterized in that, The substrate is also sandblasted before use.

5. The method for preparing the wearable coating for inhibiting hydrate growth according to claim 4, characterized in that, The sand particle size of the sandblasting treatment is 200-400 mesh; the spray angle of the sandblasting treatment is 45-70°; and the gas pressure of the sandblasting treatment is 0.5-0.8 MPa.

6. The method for preparing the wearable coating for inhibiting hydrate growth according to claim 1, characterized in that, In step S3, the electrolyte for anodic oxidation is a NaOH solution, and the current density for anodic oxidation is 1–10 mA·cm⁻¹. -2 The anodizing time is 20-30 minutes, and the anodizing temperature is 15-30℃.

7. The method for preparing the wearable coating for inhibiting hydrate growth according to claim 1, characterized in that, In step S4, the impregnation process involves immersing the coating in a low surface energy material and drawing a vacuum. After the low surface energy material has completely penetrated the coating, it is then dried.

8. An abrasive coating for inhibiting hydrate growth, prepared by the method for preparing an abrasive coating for inhibiting hydrate growth according to any one of claims 1 to 7.

Images