CN-122013087-A - Method for preparing nickel-chromium-molybdenum corrosion-resistant coating on inner surface of oil pipe by electric explosion spraying and oil pipe

Abstract

The invention belongs to the technical field of metal sulfur-resistant coatings, and particularly relates to a method for preparing a nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of an oil pipe by electric explosion spraying and the oil pipe. The method comprises the following steps of spraying Ni-Cr-Mo alloy wires on the inner surface of an oil pipe in an electric explosion spraying mode, wherein the thickness of the coating is 100-200 mu m, and the coating comprises 68-88% of Ni, 10-20% of Cr and 2-15% of Mo in percentage by mass. The Ni-Cr-Mo coating prepared by the method has the functions of wear resistance, corrosion resistance and sulfur resistance, the bonding strength of the coating and a base material reaches more than 50MPa, and the adhesive force of the metal coating and the base material is greatly increased, so that the coating can be widely applied to the inner surface of an oil pipe with the requirement of high-temperature H 2 S.

Inventors

• LI XUANPENG
• CHEN ZIHAN
• WEI RONG
• WANG SUI
• YUAN JUNTAO
• FU ANQING

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团工程材料研究院有限公司

Dates

Publication Date

20260512

Application Date

20241111

Claims (10)

1. 1. A method for preparing a nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of an oil pipe by electric explosion spraying is characterized by comprising the following steps of spraying a Ni-Cr-Mo alloy wire on the inner surface of the oil pipe by electric explosion spraying, wherein the thickness of the coating is 100-200 mu m, and the coating comprises 68-88% of Ni, 10-20% of Cr and 2-15% of Mo in percentage by mass.
2. 2. The method for preparing the nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of the oil pipe by electric explosion spraying according to claim 1, which comprises the following steps: 1) Preparing Ni-Cr-Mo wires for electric explosion spraying; 2) Pretreating the inner wall of the oil pipe; 3) And (3) taking the oil pipe as a matrix, carrying out electric explosion spraying on the Ni-Cr-Mo wire, and spraying the inner surface of the oil pipe to form the coating.
3. 3. The method for preparing the nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of the oil pipe by electric explosion spraying according to claim 2, wherein in the step 1), commercial Ni-20Cr alloy and Mo are selected to be mixed according to the formula proportion, the mixture is put into a vacuum melting furnace for melting, after one melting is finished, the sample is turned over after the sample is cooled, the melting operation is repeated, and then the melted alloy is subjected to cold rolling for a plurality of times, so that the Ni-Cr-Mo wire is obtained.
4. 4. A method for preparing a nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of an oil pipe by electric explosion spraying according to claim 3, wherein in the step 1): High-purity Ar gas with the concentration of 99.999 percent is filled into the furnace for smelting; when smelting, firstly, an arc gun power supply is turned on, and after arc striking, ti balls are smelted for 30-50 s, and oxygen in a furnace body is removed.
5. 5. A method for preparing a nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of an oil pipe by electric explosion spraying according to claim 3, wherein in the step 1): smelting the sample for 5-8 times; The diameter of the Ni-Cr-Mo wire is 0.5-1 mm.
6. 6. The method for preparing the nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of the oil pipe by electric explosion spraying according to claim 3, which is characterized in that in the step 2), the inner surface of the oil pipe is subjected to sand blasting treatment until the surface roughness is 2.5-3.5 mu m, then sequentially subjected to ultrasonic cleaning by absolute ethyl alcohol, acetone and deionized water, and dried for later use.
7. 7. The method for preparing the nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of the oil pipe by electric explosion spraying according to claim 3, wherein in the step 2), the inner diameter size of the oil pipe is in the range of 62.0 mm-124.3 mm.
8. 8. The method for preparing the nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of the oil pipe by electric explosion spraying according to claim 3, wherein in the step 3), the initial charging voltage is 11-14 kV, the capacitance of the energy storage capacitor group is 8.6-9.0 mu F, the electrode spacing is 60-70 mm, and the spraying distance is set to be 6-9 mm.
9. 9. An oil pipe prepared according to the method of any one of claims 1 to 8.
10. 10. A method according to claim 9, wherein the oil pipe is corrosion-, wear-and/or sulfur-resistant.

Description

Method for preparing nickel-chromium-molybdenum corrosion-resistant coating on inner surface of oil pipe by electric explosion spraying and oil pipe Technical Field The invention belongs to the technical field of metal sulfur-resistant coatings, and particularly relates to a method for preparing a nickel-chromium-molybdenum corrosion-resistant coating on the inner surface of an oil pipe by electric explosion spraying and the oil pipe. Background In the deep/ultra-deep mining process, the oil well pipe is subjected to high-temperature, high-pressure and high-H 2S/CO2 corrosion environments, so that the oil well pipe is corroded, cracked and other failure phenomena are caused. According to the existing NACE, ISO 15156, V & M and the like to the material selection map, the material selection in the deep layer/ultra-deep layer is mainly nickel-based alloy with high Mo content. However, in the oilfield field, ni-based alloys solve the problem of oilfield corrosion prevention, but have high cost and tend to have excessive performance. In comparison, the surface treatment technology is a relatively economical and applicable corrosion prevention technology, but the design and preparation process of the coating composition in the high-temperature high-H 2 S environment are key to influencing the corrosion resistance and sulfur resistance of the coating. The existing surface technology methods are more and mainly comprise electroplating, supersonic flame spraying, plasma spraying, cold spraying, laser cladding technology and various technologies, and various surface technologies have the advantages, but the preparation methods have relatively obvious influence on oxidation, crystallization and residual stress in the amorphous coating preparation process, are limited by the problem of oil pipe size, and are difficult to realize the preparation of the anti-corrosion coating on the inner wall of the small-aperture oil pipe (76 mm-89 mm). For example, in an anticorrosive wear-resistant coating disclosed in CN106756712B, a coating wire is sprayed on the surface of a substrate in an electric arc spraying mode, the thickness of the coating is 0.5-0.8 mm, and after the coating wire is sprayed on the surface of the substrate, a layer of hole sealing agent is coated on the surface of the coating, so that the requirements of corrosion resistance and wear resistance are met. However, the porosity of the coating prepared by the method is high, secondary sealing control is needed, the corrosion prevention cost of the oil pipe is increased, and meanwhile, the coating is limited by the size of electric arc spraying equipment, so that the long-distance coating preparation of the inner wall of the oil pipe is difficult to realize. The CN116590770A patent proposes an electroplating device in a small-caliber pipe, the CN113279029A patent proposes a Ni-W-P-Zr multi-element microcrystalline coating, a plating solution and a preparation method thereof, and although good protection can be realized, the binding force of the electroplating coating is poor, and the further application of the electroplating coating is limited due to the small thickness of the coating. CN103590033a provides a method for preparing a Ni-Cr-Mo coating on the surface of low carbon steel based on nano technology, the density and uniformity of the alloy coating are high, the material is ensured to have the strength of low carbon steel, the material is ensured to have the corrosion resistance of nickel base alloy, and the problem that the material is invalid due to a large amount of corrosion in the use process of low carbon steel is solved. The nickel-based alloy plating layer is used in the aerospace field and the seawater environment, and the method is mainly used for sintering the nickel-based alloy plating layer in a high-temperature H 2 environment to prepare a coating, wherein a sample is subjected to heat treatment in the preparation process, so that the mechanical property of a matrix is possibly influenced, and the nickel-based alloy plating layer is difficult to apply to the inner surface of an oil pipe. Compared with other preparation technologies, the electric explosion spraying technology utilizes high-density current to pass through the metal spraying material to melt, gasify and expand the metal spraying material to generate explosion and generate shock wave mechanical effect, so that molten metal liquid drops are sprayed onto the surface of a workpiece at high speed to form a coating, the running speed of molten particles is high (about 2000 m/s), the temperature and the speed of spraying particles completely depend on the energy density and the spraying distance of the material, refractory metals can be selected as the spraying material, and the like, and therefore, the electric explosion spraying technology is particularly suitable for the preparation of corrosion-resistant and wear-resistant coatings on the inner wall of a small-caliber pipeline and