Anticorrosion and wear-resistant copper plating process for steel solid sucker rod

Abstract

The invention provides an anti-corrosion and wear-resistant copper plating process for a steel solid sucker rod. The anti-corrosion and wear-resistant copper plating process comprises the following steps: (1) removing oil and rust; (2) surface activation; (3) preparing a plating solution; (4) electroplating operation is conducted, specifically, the treated sucker rod is immersed in the plating solution prepared in the step (4), current and voltage are applied for electroplating, in the electroplating process, copper ions are deposited on the surface of the sucker rod under the action of an electric field, a compact copper layer is formed, and a plating layer is formed; (5) plating layer control; (6) cleaning and drying; (7) quality inspection; and (8) packaging and storing. The 30CrMoA material sucker rod is plated with copper, the corrosion resistance of the sucker rod is enhanced, the abrasion resistance is improved, the lubricity is improved, the appearance quality is improved, the performance of the sucker rod is remarkably improved, and the service life of the sucker rod is remarkably prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of anti-corrosion and wear-resistant copper plating technology for steel solid sucker rods, and in particular to an anti-corrosion and wear-resistant copper plating technology for steel solid sucker rods. Background Art

[0002] In the oil extraction industry, the sucker rod is an important component of oil drilling equipment, and its quality is directly related to the efficiency and safety of oil extraction. 30CrMoA, as a high-quality alloy structural steel, is widely used in the manufacture of sucker rods due to its high strength, good toughness and wear resistance. However, there are still some technical difficulties in the preparation and processing of the existing sucker rod 30CrMoA material, which affects the performance and life of the sucker rod. Therefore, this patent aims to provide an improved preparation and processing technology of the sucker rod 30CrMoA material to improve the performance and life of the sucker rod. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a corrosion-resistant and wear-resistant copper plating process for a steel solid sucker rod, which is achieved through the following technical solutions: A corrosion-resistant and wear-resistant copper plating process for a steel solid sucker rod comprises the following steps: (1) Degreasing and rust removal: First, the sucker rod made of 30CrMoA material is thoroughly degreased and rusted to ensure that the copper layer can be firmly attached to the sucker rod substrate. The sucker rod is soaked in a special chemical cleaning agent; (2) Surface activation: After degreasing and rust removal, the surface of the sucker rod needs to be activated to enhance the bonding force between the copper layer and the sucker rod substrate; (3) Preparation of plating solution: Prepare the plating solution by selecting 45-110 parts of sulfuric acid and 150-250 parts of copper sulfate, and prepare the plating solution at a temperature of 20-50°C; (4) Electroplating operation: immersing the treated sucker rod in the plating solution prepared in step (4), and applying current and voltage for electroplating. During the electroplating process, copper ions are deposited on the surface of the sucker rod under the action of the electric field to form a dense copper layer, i.e., a plating layer; (5) Coating control: By controlling parameters such as electroplating time, current density and bath temperature, the thickness and uniformity of the coating can be precisely controlled; (6) Cleaning and drying: After electroplating, the sucker rod needs to be cleaned to remove residual plating solution and impurities, and dried to prevent corrosion; (7) Quality inspection: Quality inspection of copper-plated sucker rods, including the thickness, uniformity, adhesion, corrosion resistance and wear resistance of the coating, to ensure that the coating quality meets the standard requirements; (8) Packaging and storage: Qualified sucker rods should be packaged and properly stored to prevent damage during transportation and use.

[0004] As a preferred embodiment, the chemical cleaning agent in step (1) is an enzyme cleaning agent.

[0005] As a preferred embodiment, the activation treatment in step (2) is pickling, that is, soaking the sucker rod in an aqueous solution of sulfuric acid.

[0006] Compared with the prior art, the beneficial effects of the present invention are: (1) Enhanced corrosion resistance: When operating in oil wells, sucker rods are often faced with corrosion challenges from high sulfur (H2S), high carbon dioxide (CO2) and high mineralization fluids. 30CrMoA steel itself has good corrosion resistance, but after copper plating, a dense copper layer is formed on its surface, which can effectively isolate the direct contact between the corrosive medium and the substrate, thereby significantly reducing the electrochemical corrosion rate. According to experimental data, the corrosion rate of 30CrMoA sucker rods after copper plating in a simulated high-corrosion environment can be reduced by more than 20%, significantly extending the service life of the sucker rod; (2) Improved wear resistance: The copper layer not only has excellent corrosion resistance, but also has good wear resistance. During oil well operations, friction between the sucker rod and components such as the well wall and oil pipe is inevitable. The copper plating layer can effectively reduce the wear caused by this friction and protect the substrate from damage, thereby maintaining the long-term stable operation of the sucker rod; (3) Improved lubricity: Copper is a metal with good lubricity. The surface of the sucker rod after copper plating is smoother, which helps to reduce the friction resistance during the pumping process and improve the pumping efficiency. At the same time, good lubricity can also reduce the heat and wear generated by friction, further extending the service life of the sucker rod; (4) Improved appearance quality: In addition to the improvement of functionality, copper plating technology can also significantly improve the appearance quality of the sucker rod. The copper layer presents a golden luster, making the sucker rod more visually beautiful and meeting the high standards of modern industry for product appearance; (5) Higher corrosion resistance: Compared with uncopper-plated 30CrMoA sucker rods or other materials, the copper-plated 30CrMoA sucker rod has significantly improved its corrosion resistance. This makes it more suitable for oil well operations in highly corrosive environments, reducing the risk of sucker rod breakage due to corrosion; (6) Longer service life: Due to the effective protection of the copper plating layer on the substrate and the improved wear resistance of the sucker rod after copper plating, the service life of the copper-plated 30CrMoA sucker rod is significantly extended. This not only reduces the frequency and cost of replacing the sucker rod, but also improves the production efficiency of the oil well; (7) Better economic benefits: Although copper plating technology increases the manufacturing cost of the pump rod, it has better economic benefits in the long run, considering its significantly improved service life and reduced maintenance costs (such as reduced pump inspection construction costs, etc.). This economic benefit is even more obvious in oil wells with highly corrosive environments.

[0007] In summary, the copper plating technology of 30CrMoA material for sucker rods significantly improves the performance and service life of sucker rods by enhancing corrosion resistance, improving wear resistance, improving lubricity and improving appearance quality. Compared with existing technologies, this technology has the advantages of higher corrosion resistance, longer service life and better economic benefits. DETAILED DESCRIPTION

[0008] The present invention is further described in detail below in conjunction with specific embodiments: Embodiment 1: A corrosion-resistant and wear-resistant copper plating process for a steel solid sucker rod comprises the following steps: (1) Degreasing and rust removal: First, the sucker rod made of 30CrMoA material is thoroughly degreased and rusted to ensure that the copper layer can be firmly attached to the sucker rod substrate. The sucker rod is soaked in a special chemical cleaning agent; (2) Surface activation: After degreasing and rust removal, the surface of the sucker rod needs to be activated to enhance the bonding force between the copper layer and the sucker rod substrate; (3) Preparation of plating solution: Prepare the plating solution by selecting 45 parts of sulfuric acid and 150 parts of copper sulfate and preparing the plating solution at a temperature of 20°C; (4) Electroplating operation: immersing the treated sucker rod in the plating solution prepared in step (4), and applying current and voltage for electroplating. During the electroplating process, copper ions are deposited on the surface of the sucker rod under the action of the electric field to form a dense copper layer, i.e., a plating layer; (5) Coating control: By controlling parameters such as electroplating time, current density and bath temperature, the thickness and uniformity of the coating can be precisely controlled; (6) Cleaning and drying: After electroplating, the sucker rod needs to be cleaned to remove residual plating solution and impurities, and dried to prevent corrosion; (7) Quality inspection: Quality inspection of copper-plated sucker rods, including the thickness, uniformity, adhesion, corrosion resistance and wear resistance of the coating, to ensure that the coating quality meets the standard requirements; (8) Packaging and storage: Qualified sucker rods should be packaged and properly stored to prevent damage during transportation and use.

[0009] Furthermore, the chemical cleaning agent in step (1) is an enzyme cleaning agent.

[0010] Furthermore, the activation treatment in step (2) is pickling, that is, soaking the sucker rod in a sulfuric acid aqueous solution.

[0011] Embodiment 2: A corrosion-resistant and wear-resistant copper plating process for a steel solid sucker rod comprises the following steps: (1) Degreasing and rust removal: First, the sucker rod made of 30CrMoA material is thoroughly degreased and rusted to ensure that the copper layer can be firmly attached to the sucker rod substrate. The sucker rod is soaked in a special chemical cleaning agent; (2) Surface activation: After degreasing and rust removal, the surface of the sucker rod needs to be activated to enhance the bonding force between the copper layer and the sucker rod substrate; (3) Preparation of plating solution: Prepare the plating solution by selecting 80 parts of sulfuric acid and 200 parts of copper sulfate and preparing the plating solution at a temperature of 30°C; (4) Electroplating operation: immersing the treated sucker rod in the plating solution prepared in step (4), and applying current and voltage for electroplating. During the electroplating process, copper ions are deposited on the surface of the sucker rod under the action of the electric field to form a dense copper layer, i.e., a plating layer; (5) Coating control: By controlling parameters such as electroplating time, current density and bath temperature, the thickness and uniformity of the coating can be precisely controlled; (6) Cleaning and drying: After electroplating, the sucker rod needs to be cleaned to remove residual plating solution and impurities, and dried to prevent corrosion; (7) Quality inspection: Quality inspection of copper-plated sucker rods, including the thickness, uniformity, adhesion, corrosion resistance and wear resistance of the coating, to ensure that the coating quality meets the standard requirements; (8) Packaging and storage: Qualified sucker rods should be packaged and properly stored to prevent damage during transportation and use.

[0012] Furthermore, the chemical cleaning agent in step (1) is an enzyme cleaning agent.

[0013] Furthermore, the activation treatment in step (2) is pickling, that is, soaking the sucker rod in a sulfuric acid aqueous solution.

[0014] Embodiment three: A corrosion-resistant and wear-resistant copper plating process for a steel solid sucker rod comprises the following steps: (1) Degreasing and rust removal: First, the sucker rod made of 30CrMoA material is thoroughly degreased and rusted to ensure that the copper layer can be firmly attached to the sucker rod substrate. The sucker rod is soaked in a special chemical cleaning agent; (2) Surface activation: After degreasing and rust removal, the surface of the sucker rod needs to be activated to enhance the bonding force between the copper layer and the sucker rod substrate; (3) Preparation of plating solution: Prepare the plating solution by selecting 45-110 parts of sulfuric acid and 150-250 parts of copper sulfate, and prepare the plating solution at a temperature of 20-50°C; (4) Electroplating operation: immersing the treated sucker rod in the plating solution prepared in step (4), and applying current and voltage for electroplating. During the electroplating process, copper ions are deposited on the surface of the sucker rod under the action of the electric field to form a dense copper layer, i.e., a plating layer; (5) Coating control: By controlling parameters such as electroplating time, current density and bath temperature, the thickness and uniformity of the coating can be precisely controlled; (6) Cleaning and drying: After electroplating, the sucker rod needs to be Cleaning to remove residual plating solution and impurities, and drying to prevent corrosion; (7) Quality inspection: Quality inspection of copper-plated sucker rods, including the thickness, uniformity, adhesion, corrosion resistance and wear resistance of the coating, to ensure that the coating quality meets the standard requirements; (8) Packaging and storage: Qualified sucker rods should be packaged and properly stored to prevent damage during transportation and use.

[0015] Furthermore, the chemical cleaning agent in step (1) is an enzyme cleaning agent.

[0016] Furthermore, the activation treatment in step (2) is pickling, that is, soaking the sucker rod in a sulfuric acid aqueous solution.

[0017] Although 30CrMA material has certain corrosion resistance, it is prone to electrochemical corrosion in the harsh environment of the oil field, especially in oil wells with high concentrations of H2S, CO2 and high mineralization. Copper is a relatively stable metal that can slow down the rate of electrochemical corrosion. Therefore, the copper layer coated on the outer surface of the sucker rod made of 30CrMoA material can significantly improve the corrosion resistance of the sucker rod and extend its service life.

[0018] The copper coating not only provides an extra layer of protection for the sucker rod, but also enhances the mechanical strength of the sucker rod. The copper layer is closely combined with the 30CrMoA substrate to jointly withstand external loads and improve the bearing capacity and impact resistance of the sucker rod.

[0019] The electroplating process is used to ensure a close bond between the copper layer and the 30CrMoA substrate. At the same time, the thickness of the copper layer is controlled by controlling parameters such as electroplating time, current density and plating solution temperature to balance corrosion resistance and cost. According to the electroplating process, the thickness of the copper layer can be above 0.3mm to meet the corrosion resistance requirements.

[0020] By coating the surface of the 30CrMoA sucker rod with a copper layer, the corrosive medium is effectively isolated from the substrate, thereby significantly improving the corrosion resistance of the sucker rod. Experimental data show that compared with the uncoated 30CrMoA sucker rod, the service life of the sucker rod prepared by this patent in a corrosive environment is increased by at least 20%.

[0021] The copper layer forms a tight bond with the 30CrMoA substrate, which does not affect the mechanical properties of the sucker rod. The sucker rod prepared by this patent still has the high strength and toughness of the 30CrMoA material, and can meet various requirements in the oil production process.

[0022] Due to the improved corrosion resistance, the service life of the sucker rod is extended, and the number of repairs and replacements due to corrosion is reduced, thereby reducing costs and maintenance expenses. In addition, the introduction of the copper layer does not significantly increase the manufacturing cost, making the sucker rod prepared by this patent more cost-effective.

[0023] The specific implementation of the present invention is described in detail above, but it is only used as an example. The present invention is not limited to the specific implementation cases described above, and equivalent modifications to the present invention are also within the protection scope of the present invention.

Claims

1. A corrosion-resistant and wear-resistant copper plating process for a steel solid sucker rod, characterized in that: The following steps are involved: Degreasing and rust removal: First, the sucker rod made of 30CrMoA material is thoroughly degreased and rusted to ensure that the copper layer can be firmly attached to the sucker rod substrate, and the sucker rod is soaked with a special chemical cleaning agent; Surface activation: After degreasing and rust removal, the surface of the sucker rod needs to be activated to enhance the bonding force between the copper layer and the sucker rod substrate; Preparation of plating solution: Prepare the plating solution by selecting 45-110 parts of sulfuric acid and 150-250 parts of copper sulfate, and prepare the plating solution at a temperature of 20-50°C; Electroplating operation: immerse the treated sucker rod in the plating solution prepared in step (4), and apply current and voltage for electroplating. During the electroplating process, copper ions are deposited on the surface of the sucker rod under the action of the electric field to form a dense copper layer, i.e., a plating layer; Plating control: By controlling parameters such as electroplating time, current density and bath temperature, the thickness and uniformity of the coating can be precisely controlled; Cleaning and drying: After electroplating, the sucker rod needs to be cleaned to remove residual plating solution and impurities, and dried to prevent corrosion; Quality inspection: Conduct quality inspection on the copper-plated sucker rods, including the thickness, uniformity, adhesion, corrosion resistance and wear resistance of the coating, to ensure that the coating quality meets the standard requirements; Packaging and storage: Qualified sucker rods shall be packaged and stored properly to prevent damage during transportation and use.

2. The anti-corrosion and wear-resistant copper plating process for a steel solid sucker rod according to claim 1 is characterized in that: The chemical cleaning agent described in step (1) is an enzyme cleaning agent.

3. The anti-corrosion and wear-resistant copper plating process for a steel solid sucker rod according to claim 1, characterized in that: The activation treatment described in step (2) is pickling, that is, soaking the sucker rod in a sulfuric acid aqueous solution.