CN117917484A - Erosion-resistant carbon-based coating on inner surface of oil pipe and preparation method thereof - Google Patents
Erosion-resistant carbon-based coating on inner surface of oil pipe and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an erosion-resistant carbon-based coating on the inner surface of an oil pipe and a preparation method thereof, comprising the following steps: (Si, N) interfacial layers and multilayer alternating structures; the multilayer alternating structure is formed by alternately forming a nano ((Si, N) -DLC) x layer and a micro ((Si, N) -DLC) y layer, and the inner surface of the oil pipe, the (Si, N) interface layer and the multilayer alternating structure are sequentially connected. The bonding strength between the coating and the oil pipe matrix can be improved and the interface stress can be reduced through the (Si, N) interface layer, the overall erosion resistance of the coating is enhanced, and the alternating structure formed by the nano ((Si, N) -DLC) x layer and the micron ((Si, N) -DLC) y layer can not only reduce the overall internal stress level of the coating, but also remarkably improve the bonding strength between the coating and the oil pipe matrix and the (Si, N) interface layer, and meanwhile obtain higher hardness, so that the erosion resistance of the erosion resistant carbon-based coating on the inner surface of the oil pipe is further remarkably improved.
Description
Technical Field
The invention relates to the field of anti-corrosion coatings, in particular to an erosion-resistant carbon-based coating for the inner surface of an oil pipe and a preparation method thereof.
Background
The oil pipe is a carrier for exploitation and transportation of oil gas commonly used in oil and gas fields. Along with the increasingly severe working condition environments of oil and gas field exploitation and conveying, the oil pipe is easy to corrode and erode under the action of corrosive media, so that the oil pipe is perforated, cracked and even loses efficacy, and the production safety of the oil and gas field is seriously threatened. How to effectively prevent the problems of corrosion and erosion caused by the corrosive medium of the oil and gas field pipeline is a great challenge facing the current oil and gas field pipeline.
The surface protective coating is an effective way to solve the problems of corrosion and erosion of the oil pipe. The corrosion and erosion of corrosive media are isolated and prevented by preparing the corrosion-resistant coating on the inner surface of the oil pipe, so that the occurrence of perforation, cracking and failure of the pipeline is reduced. The existing surface protective coating mainly comprises epoxy anticorrosive paint, NI-W metal plating and the like, and the corresponding preparation technology mainly comprises a spraying method, an electroless plating method, an electroplating method and the like. However, the existing protective coating material and the existing preparation technology often have a series of problems of low hardness, high porosity, weak binding force and the like, so that the prepared protective coating has poor corrosion resistance and erosion resistance effects, and oil pipe corrosion and erosion phenomena are still serious.
Disclosure of Invention
The invention aims to provide an erosion-resistant carbon-based coating for the inner surface of an oil pipe and a preparation method thereof, so as to solve the problems of low hardness, weak binding force and poor corrosion resistance of the existing protective coating for the inner surface of the oil pipe.
In order to achieve the above object, the present invention provides an erosion resistant carbon-based coating for an inner surface of an oil pipe, comprising: (Si, N) interfacial layers and multilayer alternating structures;
The multilayer alternating structure is formed by alternately forming a nano ((Si, N) -DLC) x layer and a micro ((Si, N) -DLC) y layer, and the inner surface of the oil pipe, the (Si, N) interface layer and the multilayer alternating structure are sequentially connected.
Optionally, the (Si, N) interface layer is a transition layer composed of Si element and N element.
Optionally, the thickness of the (Si, N) interface layer is 20-60nm.
Optionally, the nano ((Si, N) -DLC) x layer has a thickness of 200-600nm.
Optionally, the micrometer ((Si, N) -DLC) y layer has a thickness of 1-1.6 μm.
Optionally, the number of layers of nano ((Si, N) -DLC) x and micro ((Si, N) -DLC) y is 4-10.
The invention also provides a preparation method of the erosion-resistant carbon-based coating on the inner surface of the oil pipe, which comprises the following steps: pretreating the inner surface of the oil pipe to obtain the treated inner surface of the oil pipe; forming a (Si, N) interface layer on the treated inner surface of the oil pipe according to the treated inner surface of the oil pipe, si element and N element; forming the erosion resistant carbon-based coating according to the (Si, N) interfacial layer, nano ((Si, N) -DLC) x layer, and micro ((Si, N) -DLC) y layer; wherein the nano ((Si, N) -DLC) x layer and the micro ((Si, N) -DLC) y layer alternately form a multi-layer alternating structure, and the inner surface of the oil pipe, the (Si, N) interface layer and the multi-layer alternating structure are sequentially connected.
Optionally, the (Si, N) interface layer formed on the treated inner surface of the oil pipe according to the treated inner surface of the oil pipe, si element and N element includes: and performing Si and N element co-permeation treatment on the treated inner surface of the oil pipe by a plasma infiltration method to form the (Si, N) interface layer.
Optionally, obtaining the nano ((Si, N) -DLC) x layer comprises: and performing plasma enhanced chemical vapor deposition on the surface of the (Si, N) interface layer by a hollow cathode plasma vapor deposition method to form the nano ((Si, N) -DLC) x layer.
Optionally, obtaining the micrometer ((Si, N) -DLC) y layer comprises: and performing plasma enhanced chemical vapor deposition on the surface of the nano ((Si, N) -DLC) x layer by a hollow cathode plasma vapor deposition method to form the micrometer ((Si, N) -DLC) y layer.
The invention has the technical effects and advantages that:
the invention provides an erosion-resistant carbon-based coating on the inner surface of an oil pipe and a preparation method thereof, comprising the following steps: (Si, N) interfacial layers and multilayer alternating structures; the multilayer alternating structure is formed by alternately forming nano ((Si, N) -DLC) x layers and micro ((Si, N) -DLC) y layers, and the inner surface of the oil pipe, the (Si, N) interface layers and the multilayer alternating structure are sequentially connected. The bonding strength between the coating and the oil pipe matrix can be improved and the interface stress can be reduced through the (Si, N) interface layer, the overall erosion resistance of the coating is enhanced, and the alternating structure formed by the nano ((Si, N) -DLC) x layer and the micro ((Si, N) -DLC) y layer can not only reduce the overall internal stress level of the coating, but also remarkably improve the bonding strength between the coating and the oil pipe matrix and the (Si, N) interface layer, and meanwhile, higher hardness is obtained, so that the erosion resistance of the erosion resistant carbon-based coating on the inner surface of the oil pipe is further remarkably improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
FIG. 1 is a schematic diagram of the structure of an erosion resistant carbon-based coating on the inner surface of an oil pipe;
FIG. 2 is a flow chart of a method of preparing an erosion resistant carbon-based coating on the inner surface of an oil pipe;
FIG. 3 is a surface SEM test chart of an erosion resistant carbon-based coating on the interior surface of an oil pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the defects in the prior art, the invention discloses an erosion-resistant carbon-based coating on the inner surface of an oil pipe, which comprises the following components: (Si, N) interfacial layers and multilayer alternating structures; the multilayer alternating structure is composed of nanometer
The ((Si, N) -DLC) x layers and the micrometer ((Si, N) -DLC) y layers are alternately formed, and the inner surface of the oil pipe, the (Si, N) interface layers and the multilayer alternate structure are sequentially connected. The bonding strength between the coating and the oil pipe matrix can be improved and the interface stress can be reduced through the (Si, N) interface layer, the overall erosion resistance of the coating is enhanced, and the alternating structure formed by the nano ((Si, N) -DLC) x layer and the micron ((Si, N) -DLC) y layer can not only reduce the overall internal stress level of the coating, but also remarkably improve the bonding strength between the coating and the oil pipe matrix and the (Si, N) interface layer, and meanwhile obtain higher hardness, so that the erosion resistance of the erosion resistant carbon-based coating on the inner surface of the oil pipe is further remarkably improved.
The following detailed description is provided for a better understanding of the present invention.
It should be noted that, as used herein, the term "coating" is interchangeable with "erosion resistant carbon-based coating of the inner surface of an oil pipe"; the (Si, N) interfacial layer/nano ((Si, N) -DLC) x layer/micro ((Si, N) -DLC) y layer and the erosion resistant carbon-based coating can be replaced with each other; letters x, y in the nano ((Si, N) -DLC) x layer and the micro ((Si, N) -DLC) y layer both represent the number of layers of the layer; the term N80 represents the brand of the metal material of the oil casing of a specific steel grade, and is according to the tenth edition of standard of the American Petroleum institute API SPECSCT CT for oil and gas industry casing and oil pipe Specification, and the corresponding national standard is GB/T9711-2017 for steel pipes for pipeline transportation systems of the petroleum and gas industry; the term "plasma" refers to a form of matter in a critical state; the term "carbon source" refers to the feedstock that provides the elemental carbon in the coating; the term "nitrogen source" refers to the source material that provides the nitrogen element in the coating; the term "silicon source" refers to the raw material that provides elemental silicon in the coating; the term "sccm" is a unit of volumetric flow, i.e., english standard-state cubic centimeterper minute; the term average erosion rate is the thickness loss rate of the coating material under the erosion condition, and represents the erosion damage degree and the erosion resistance of the erosion resistant carbon-based coating on the inner surface of the oil pipe, namely, the larger the average erosion rate is, the more serious the erosion resistance of the erosion resistant coating is, and the lower the erosion resistance is; the term "high purity gas" refers to a gas having a purity of 99.99%.
The invention provides an erosion-resistant carbon-based coating for the inner surface of an oil pipe, which is shown in figure 1. The coating comprises (Si, N) interfacial layers 3 and a multilayer alternating structure 2; the multilayer alternating structure is formed by alternately forming a nano ((Si, N) -DLC) x layer 4 and a micro ((Si, N) -DLC) y layer 5, and the oil pipe inner surface 1, the (Si, N) interface layer and the multilayer alternating structure are sequentially connected.
It should be noted that the (Si, N) interface layer is a transition layer for relieving the mismatch of thermal expansion coefficients between the oil pipe and the erosion resistant carbon-based coating, reducing interface stress, and enhancing the bonding strength between the erosion resistant carbon-based coating and the inner surface of the oil pipe; the (Si, N) interfacial layer has a thickness of 20-60nm, preferably 35-50nm.
The thickness of the nano ((Si, N) -DLC) x layer is 200-600nm, preferably 300-450nm; the nano ((Si, N) -DLC) x layer contains 3-6% of silicon element and 4-7% of nitrogen element.
The micrometer ((Si, N) -DLC) y layer has a thickness of 1-1.6 μm, preferably 1.1-1.3 μm; the content of silicon element in the micrometer ((Si, N) -DLC) y layer is 3-6%, and the content of nitrogen element is 4-7%.
The total thickness of the erosion-resistant carbon-based coating on the inner surface of the oil pipe is 5-18 mu m, preferably 6-15 mu m; the hardness value of the coating is 12-17GPa, the binding force is 15-30N, and the average erosion rate is 5 multiplied by 10 -11kg/m2 s.
The range of x and y is 4-8.
The invention provides an erosion-resistant carbon-based coating on the inner surface of an oil pipe, which sequentially comprises an (Si, N) interface layer, a nano ((Si, N) -DLC) x layer and a micro ((Si, N) -DLC) y layer from inside to outside, wherein the nano ((Si, N) -DLC) x layer and the micro ((Si, N) -DLC) y layer are of an alternate structure. The (Si, N) interface layer can obviously improve the bonding strength of the coating and the oil pipe matrix, reduce interface stress and enhance the integral erosion resistance of the coating; the alternating structure formed by the nano ((Si, N) -DLC) x layer and the micro ((Si, N) -DLC) y layer not only can reduce the overall internal stress level of the coating, but also can remarkably improve the bonding strength between the coating and the oil pipe matrix and the (Si, N) interfacial layer, and simultaneously obtain higher hardness, thereby further remarkably improving the erosion resistance of the erosion resistant carbon-based coating on the inner surface of the oil pipe.
The invention also provides a preparation method of the erosion-resistant carbon-based coating on the inner surface of the oil pipe, as shown in figure 2. The method comprises the following steps: pretreating the inner surface of the oil pipe to obtain the treated inner surface of the oil pipe; forming an (Si, N) interface layer according to the treated inner surface of the oil pipe, the Si element and the N element; forming the erosion resistant carbon-based coating according to the (Si, N) interfacial layer, nano ((Si, N) -DLC) x layer, and micro ((Si, N) -DLC) y layer; wherein the nano ((Si, N) -DLC) x layer and the micro ((Si, N) -DLC) y layer alternately form a multi-layer alternating structure, and the inner surface of the oil pipe, the (Si, N) interface layer and the multi-layer alternating structure are sequentially connected.
It should be noted that the oil pipe base material is selected from the group consisting of: carbon steel, stainless steel, corrosion resistant alloys, or combinations thereof. Preferably, the oil pipe base material is carbon steel oil pipe or N80 oil pipe.
The pretreatment step comprises the following steps: the inner surface of the oil pipe base material is firstly polished; (b) sand blasting the inner surface of the oil pipe base material; (c) cleaning the inner surface of the oil pipe base material. The pretreatment step (a) has the following functions: removing rust-proof paint, impurities and the like painted on the inner wall of the metal pipeline when leaving the factory, and reducing the roughness of the inner wall; the polishing materials selected are as follows: silicon carbide, aluminum oxide, nylon, or combinations thereof, preferably nylon. The surface roughness of the metal pipe after surface polishing is Ra <0.6, preferably 0.1-0.3. The pretreatment step (b) has the following functions: further removing impurities and improving surface nucleation sites. The sand blasting material is as follows: quartz sand, white corundum sand, brown corundum sand, or combinations thereof, preferably quartz sand. The pretreatment step (c) is ultrasonic cleaning. The ultrasonic cleaning medium is acetone, ethanol, an ionic active agent or a combination thereof, preferably ethanol. The ultrasonic cleaning time is 1-2h.
And drying the oil pipe matrix after cleaning, and then placing the oil pipe matrix into a hollow cathode plasma enhanced chemical vapor deposition device for plasma cleaning, wherein the plasma cleaning is performed in a vacuum state with the vacuum degree of 10 -3 Pa. The gas used for vacuum plasma cleaning is argon. The argon flow is 100-180sccm. The vacuum plasma cleaning time is 30-60min.
And (3) performing co-infiltration of Si and N elements on the surface of the metal pipeline by a plasma infiltration method in the presence of a silicon source and a nitrogen source, so as to form the (Si, N) interface layer on the inner surface of the oil pipe. The conditions of the plasma Si and N co-permeation include: the pressure of the plasma infiltration gas is 20-70Pa, and the plasma infiltration time is 5-15min. The silicon source for plasma infiltration is silane gas, the nitrogen source adopts high-purity nitrogen, the flow of the silane is 40-80sccm, and the flow of the nitrogen is 30-60sccm, so that the (Si, N) interface layer is formed on the surface of the metal pipeline.
And performing chemical vapor deposition on the surface of the (Si, N) interface layer in the presence of a silicon source, a nitrogen source and a carbon source by a hollow cathode plasma vapor deposition method, so as to form the nano ((Si, N) -DLC) x layer on the surface of the (Si, N) interface layer. The deposition conditions include: the deposition pressure is 5-15Pa; the deposition time is 1-5min; the silicon source gas is silane; the flow rate of the silane is 30-60sccm; the nitrogen source gas is selected from nitrogen, ammonia or a combination thereof, preferably, the nitrogen source gas is nitrogen; the flow of the nitrogen is 20-60sccm; the carbon source gas is selected from methane, acetylene, propylene, or a combination thereof, preferably, the carbon source gas is acetylene; the acetylene flow is 50-100sccm.
The micrometer ((Si, N) -DLC) y layer is formed on the surface of the nano ((Si, N) -DLC) x layer by chemical vapor deposition on the surface of the nano ((Si, N) -DLC) x layer in the presence of a silicon source, a nitrogen source, and a carbon source by a hollow cathode plasma vapor deposition method. The deposition conditions include: the deposition pressure is 10-20Pa; the deposition time is 15-30min; the silicon source gas is silane; the flow rate of the silane is 30-60sccm; the nitrogen source gas is selected from nitrogen, ammonia or a combination thereof, preferably, the nitrogen source gas is nitrogen; the flow of the nitrogen is 20-60sccm; the carbon source gas is selected from methane, acetylene, propylene, or a combination thereof, preferably, the carbon source gas is acetylene; the flow rate of the carbon source is 60-120sccm.
And finally, alternately repeating the nano ((Si, N) -DLC) x layer and the micron ((Si, N) -DLC) y layer for 4-8 times to obtain the erosion-resistant carbon-based coating product for the inner surface of the oil pipe.
The coating prepared by the hollow cathode plasma enhanced chemical vapor deposition method has high density, few defects, strong designability of the coating structure and strong bonding force between the coating and the metal pipeline matrix, thereby obviously improving the erosion resistance of the inner surface of the oil pipe; meanwhile, the method has small influence on the dimensional accuracy of the metal matrix, has good adaptability to the appearance of the base material, and is suitable for the fields of new energy, nuclear power, hydrogen energy storage and transportation and the like. Meanwhile, the coating has low production cost, simple process and strong controllability, and is suitable for industrial production.
In order to fully embody the technical effects of the invention, the invention also provides a specific embodiment.
Example 1: preparation method of erosion-resistant carbon-based coating compounded on inner surface of N80 oil pipe
The preparation method comprises the following specific preparation steps: (1) Adopting a nylon grinding head to grind the inner surface of an N80 oil pipe with the size of phi 89mm 2m, removing impurities and polishing until the surface roughness Ra=0.3, then adopting white corundum sand to carry out surface sand blasting, and carrying out ultrasonic cleaning on a metal pipeline for 30min by alcohol after sand blasting; and (3) placing the cleaned N80 oil pipe into an oven, drying at 60 ℃ for 6 hours, and then placing the cleaned N80 oil pipe into a plasma enhanced chemical vapor deposition device. And vacuumizing the plasma enhanced chemical vapor deposition device to 10 -3 Pa by adopting a two-stage vacuum pump set, and then simultaneously introducing high-purity argon with the argon flow of 120sccm. And starting a high-frequency pulse power supply to load voltage to generate argon plasma, and cleaning the inner wall of the N80 pipeline for 40min. (2) Vacuumizing a plasma enhanced chemical vapor deposition device to 10 -3 Pa by adopting a two-stage vacuum pump set, respectively and sequentially introducing silane gas and high-purity nitrogen through a plasma infiltration method, and performing Si and N co-infiltration treatment on the inner surface of an N80 metal pipeline, so that an (Si, N) interface layer grows on the inner surface of the N80 metal pipeline, wherein the flow of the silane gas is 55sccm, the flow of the nitrogen is 55sccm, the reaction pressure is 30Pa, and the reaction time is 8min. (3) And (3) performing plasma enhanced chemical vapor deposition on the surface of the (Si, N) interface layer in the presence of a silicon source, a nitrogen source and a carbon source by a hollow cathode plasma vapor deposition method, so as to form a nano ((Si, N) -DLC) x layer on the surface of the (Si, N) interface layer. The deposition pressure was 12Pa, the deposition time was 4min, the flow rate of silane gas was 40sccm, the flow rate of nitrogen gas was 30sccm, and the flow rate of acetylene gas was 85sccm. (4) By the hollow cathode plasma vapor deposition method, plasma enhanced chemical vapor deposition is performed on the surface of the nano ((Si, N) -DLC) x layer in the presence of a silicon source, a nitrogen source and a carbon source, thereby forming a micrometer ((Si, N) -DLC) y layer on the surface of the nano ((Si, N) -DLC) x layer. The deposition pressure was 15Pa, the deposition time was 25 minutes, the silane gas flow rate was 50sccm, the nitrogen source gas flow rate was 40sccm, and the acetylene flow rate was 100sccm. (5) Nano ((Si, N) -DLC) x layers and micro ((Si, N) -DLC) y layers were alternately deposited 6 times by hollow cathode plasma vapor deposition to form nano ((Si, N) -DLC) x layers and micro ((Si, N) -DLC) y layers alternating structure coatings (where x=6, y=6). After the coating preparation step is finished, the erosion-resistant carbon-based coating with a composite and N80 pipeline inner surface (Si, N) interface layer/nano ((Si, N) -DLC) x layer/micron ((Si, N) -DLC) y layer structure is obtained.
The surface morphology of the erosion resistant carbon-based coating compounded on the inner surface of the N80 oil pipe is tested, and as shown in figure 3, the erosion resistant carbon-based coating compounded on the inner surface of the N80 oil pipe can be seen to be in accordance with the coating design.
In addition, the invention also carries out erosion resistance test, hardness and binding force test on the erosion resistant carbon-based coating (example 1) and comparative examples 1-5 compounded on the inner surface of the N80 oil pipe, and the measurement results are shown in table 1.
It should be noted that, comparative example 1 differs from the method for preparing an erosion-resistant carbon-based coating layer compounded on the inner surface of N80 oil pipe (example 1) only in that the roughness ra=0.4 of the inner surface of the pipe after polishing in step (1); the comparative example 2 differs from the method for preparing the erosion resistant carbon-based coating compounded on the inner surface of the N80 oil pipe only in that nitrogen is not introduced in the step (2); the comparison example 3 is different from the preparation method of the erosion-resistant carbon-based coating compounded on the inner surface of the N80 oil pipe only in that the silane flow rate in the step (3) is less than 30sccm, and the nitrogen flow rate is more than 60sccm; comparative example 4 differs from the method for preparing the erosion resistant carbon-based coating composited on the inner surface of the N80 oil pipe only in that the silane flow rate is more than 60sccm, and the nitrogen flow rate is less than 20sccm; comparative example 5 differs from the method of preparing an erosion resistant carbon-based coating composited on the inner surface of an N80 oil pipe only in that the number of repetitions is 3.
The erosion resistance test method comprises the following steps: placing an erosion-resistant carbon-based coating sample on the inner surface of the oil pipe into a multifunctional erosion testing system; the erosion resistance of the coating is tested by introducing solid-liquid-gas three-phase medium with certain content and certain speed along the coating direction of the inner surface of the oil pipe. The specific test parameters are as follows: the solid medium is quartz sand with the particle size of=0.5 mm, the filling amount of the solid medium is=2 kg/H, the liquid test medium is a domestic field water sample and an oil sample of a certain sulfur-containing oil and gas field and is mixed according to the volume ratio of 1:1, the filling amount of the liquid test medium is=2L/H, the gas test medium is CO 2 and H 2 S gas, the filling amount of the gas test medium is equivalent to=2L/min, and the CO 2＝1.8L/min,H2 S=0.2L/min. The total erosion speed of the solid-liquid-gas three-phase mixture is 10m/s, and meanwhile, the erosion device is heated to 55 ℃ and the test period is 7 days. After the experiment is finished, the erosion resistance of the coating can be obtained by testing and analyzing the weight change rate of the coating sample before and after the experiment.
The following are the results of comparative examples 1-5 and performance test experiments for DLC coatings (example 1) compounded on the inner surface of N80 tubing, as shown in table 1:
TABLE 1 comparative examples 1-5 and Performance test of DLC coating composite on N80 oil pipe inner surface
As can be seen from Table 1, the erosion-resistant carbon-based coating composite on the inner surface of the N80 oil pipe prepared in example 1 of the present invention has excellent hardness, binding force and erosion resistance compared with comparative examples 1 to 5.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. An erosion resistant carbon-based coating for an interior surface of an oil pipe, comprising: (Si, N) interfacial layers and multilayer alternating structures;
The multilayer alternating structure is formed by alternately forming a nano ((Si, N) -DLC) x layer and a micro ((Si, N) -DLC) y layer, and the inner surface of the oil pipe, the (Si, N) interface layer and the multilayer alternating structure are sequentially connected.
2. The erosion resistant carbon-based coating of claim 1, wherein the (Si, N) interfacial layer is a transition layer composed of Si element and N element.
3. The erosion resistant carbon-based coating of the inner surface of an oil pipe according to claim 1, wherein the thickness of the (Si, N) interface layer is 20-60nm.
4. The erosion resistant carbon-based coating of claim 1, wherein the nano ((Si, N) -DLC) x layer has a thickness of 200-600nm.
5. The erosion resistant carbon-based coating of claim 1, wherein the micrometer ((Si, N) -DLC) y layer has a thickness of 1-1.6 μm.
6. The erosion resistant carbon-based coating of an interior surface of an oil pipe according to claim 1, the number of said nano ((Si, N) -DLC) x layers and said micro ((Si, N) -DLC) y layers being 4-10 layers.
7. The preparation method of the erosion-resistant carbon-based coating on the inner surface of the oil pipe is characterized by comprising the following steps of:
Pretreating the inner surface of the oil pipe to obtain the treated inner surface of the oil pipe;
Forming a (Si, N) interface layer on the treated inner surface of the oil pipe according to the treated inner surface of the oil pipe, si element and N element;
Forming the erosion resistant carbon-based coating according to the (Si, N) interfacial layer, nano ((Si, N) -DLC) x layer, and micro ((Si, N) -DLC) y layer;
Wherein the nano ((Si, N) -DLC) x layer and the micro ((Si, N) -DLC) y layer alternately form a multi-layer alternating structure, and the inner surface of the oil pipe, the (Si, N) interface layer and the multi-layer alternating structure are sequentially connected.
8. The method of producing an erosion resistant carbon-based coating on an inner surface of an oil pipe according to claim 7, wherein the (Si, N) interfacial layer formed on the treated inner surface of the oil pipe according to the treated inner surface of the oil pipe, si element and N element comprises:
And performing Si and N element co-permeation treatment on the treated inner surface of the oil pipe by a plasma infiltration method to form the (Si, N) interface layer.
9. The method for producing an erosion resistant carbon-based coating on an inner surface of an oil pipe according to claim 7, wherein the nano ((Si, N) -DLC) x layer is obtained, comprising:
And performing plasma enhanced chemical vapor deposition on the surface of the (Si, N) interface layer by a hollow cathode plasma vapor deposition method to form the nano ((Si, N) -DLC) x layer.
10. The method for producing an erosion resistant carbon-based coating on an inner surface of an oil pipe according to claim 7, wherein the micrometer ((Si, N) -DLC) y layer is obtained, comprising:
And performing plasma enhanced chemical vapor deposition on the surface of the nano ((Si, N) -DLC) x layer by a hollow cathode plasma vapor deposition method to form the micrometer ((Si, N) -DLC) y layer.
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