Stripping Solution for Defective Coatings of Copper-Plated Carbon Steel Welding Wires, Preparation Method and Electrochemical Stripping Method
By using specific composition deplating solution and electrochemical methods, the pollution and economic benefits of carbon steel copper-plated copper wires in the deplating process are solved, low-energy-consuming and environmentally friendly copper plating etching and deplating solution regeneration are achieved, and the regeneration and utilization efficiency of copper-plated wires is improved.
Patent Information
- Application Number
- CN202310005142.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-01-04
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2043-01-04
AI Technical Summary
During the deplating process, existing carbon steel copper-plated wires have problems such as high pollution, inability to regenerate, low economic benefits and serious erosion of the substrate.
A deplating solution containing borax, sodium acetate, OP-10, composite antioxidant, sodium thiosulfate, thiourea, tralaton X-100 solution, ethanol solution of erythrite and copper chloride was used to etch the copper plating at low voltage by electrochemical methods, and the deplating solution was recycled at high copper content.
It realizes low-energy consumption and environmentally friendly copper plating etching, and the deplating solution is regenerated, avoids erosion of steel substrates, and improves the recycling efficiency of copper-plated wires.
Smart Images
Figure CN115928182B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a stripping solution for defective coatings of carbon steel copper-plated welding wires, a preparation method thereof, and an electrochemical stripping method, belonging to the technical field of regeneration of defective copper-plated welding wires. Background Art
[0002] Copper plating on the surface of steel has advantages such as good coating coverage. The copper coating plays an irreplaceable role in improving the appearance, corrosion resistance, electrical conductivity, and thermal conductivity of steel workpieces. Therefore, electroplating copper has been widely used industrially as an important means of steel surface treatment. In the field of welding, in order to ensure that the welding wire has excellent corrosion resistance, electrical conductivity, and self-lubrication, copper is usually electroplated on the surface of the solid wire during the manufacture of the solid wire to make a copper-plated solid wire.
[0003] However, since steel welding wires belong to relatively active substrates, loose copper layers are easily displaced on the surface during copper electroplating, resulting in coating defects. Moreover, although the corrosion resistance of copper is better than that of steel, it does not belong to a metal with very good corrosion resistance. Especially in a humid environment, the surface is extremely prone to oxidation corrosion. Once there are defects or corrosion in the copper coating of the copper-plated welding wire, it will have a great adverse impact on the welding process. In order to ensure the welding effect, for welding wires with defective or corroded copper coatings, the original coating must be stripped and then the coating must be regenerated before it can be used.
[0004] The process of stripping copper usually falls into two categories. The first category uses strong oxidants (such as chromic anhydride, etc.) to chemically oxidize the copper coating, and the second category uses electrochemical dissolution of copper, and often also contains chromic anhydride to promote the electrochemical dissolution of the copper coating. There are many insurmountable problems in the traditional process of stripping copper, such as using chromic anhydride that pollutes the environment, irreversible changes in the composition of the stripping solution resulting in non-renewable utilization, high cost of oxidants or electricity, and serious corrosion of the steel welding wire substrate. Therefore, developing an environmentally friendly and economical stripping method that is harmless to the welding wire substrate is of great significance for the regeneration and utilization of carbon steel copper-plated welding wires. Summary of the Invention
[0005] The first object of the present invention is to provide a stripping solution for defective coatings of carbon steel copper-plated welding wires, which solves the technical problems such as large pollution of the stripping solution, non-renewability, low economic efficiency, and serious erosion of the substrate during the stripping process of carbon steel copper-plated welding wires with defective coatings.
[0006] The second object of the present invention is to provide a preparation method for the stripping solution for defective coatings of carbon steel copper-plated welding wires that is convenient to operate.
[0007] The third object of the present invention is to provide an electrochemical stripping method, in which the plating solution only etches the copper coating without eroding the steel substrate, the stripping process has low energy consumption, and the stripping solution can be regenerated.
[0008] To achieve the above object, the present invention is realized through the following technical solutions:
[0009] A stripping solution for defective coatings of carbon steel copper-plated welding wires, comprising the following raw materials: 3.0 - 10.0 g of borax, 15.0 - 50.0 g of sodium acetate, 1.0 - 2.0 g of OP-10, 2.0 - 5.0 g of a composite antioxidant, 3.0 - 10.0 g of sodium thiosulfate, 50.0 - 80.0 g of thiourea, 200 mL of a 10% Triton X-100 solution, 0.1 wt% of bathocuproine ethanol solution, 3.0 - 10.0 g of cuprous chloride, and water.
[0010] Based on the above stripping solution for defective coatings of carbon steel copper-plated welding wires, the composite antioxidant is a combination of two or three of sodium hypophosphite, sodium sulfite, sodium borohydride, or formaldehyde.
[0011] A method for preparing a stripping solution for defective coatings of carbon steel copper-plated welding wires, comprising the following steps: Weigh 3.0 - 10.0 g of borax and dissolve it in 500 mL of deionized water and stir evenly, then sequentially dissolve 15.0 - 50.0 g of sodium acetate, 1.0 - 2.0 g of OP-10, 2.0 - 5.0 g of the composite antioxidant, 3.0 - 10.0 g of sodium thiosulfate, 50.0 - 80.0 g of thiourea, and 200 mL of a 10% Triton X-100 solution and stir evenly, then mix it evenly with 50 - 200 mL of 0.1 wt% bathocuproine ethanol solution, and finally add 3.0 - 10.0 g of cuprous chloride, stir until dissolved, and add deionized water to 1000 mL to obtain the stripping solution.
[0012] An electrochemical stripping method for defective coatings of carbon steel copper-plated welding wires, comprising the following steps:
[0013] (1) Prepare the stripping solution;
[0014] (2) Electrochemical stripping of the defective coating: Use a stainless steel tube as the cathode, and use the welding wire to be stripped as the anode and place it in the cavity of the cathode tube. Immerse the anode and cathode in the stripping solution and keep the temperature at 30 - 50 °C. Keep the voltage between the anode and cathode constant at 1.0 - 1.3 V and make the anode continuously move in the cavity of the cathode tube at a speed of 2 cm / min. After the anode is removed from the stripping solution, wash it with deionized water and dry it to complete the electrochemical stripping;
[0015] (3) Recycling and regeneration of the stripping solution: When the copper content in the stripping solution is higher than 10 g / L, cool the stripping solution to 1 - 5 °C and let it stand for 12 h. Filter out the precipitated crystals, then heat the stripping solution to 40 °C. Next, dissolve 0.5 - 2.0 g of compound antioxidant, 0.3 - 1.0 g of sodium thiosulfate, and 10 - 20 g of thiourea in the stripping solution in sequence and stir evenly to complete the regeneration of the stripping solution.
[0016] Based on the above electrochemical stripping method for defective coatings on carbon steel copper-coated welding wires, keep the voltage between the anode and cathode constant at 1.1 - 1.25 V.
[0017] Working principle of the present invention:
[0018] In the preparation process of the stripping solution for the electrochemical stripping method of defective coatings on carbon steel copper-coated welding wires of the present invention, first use borax to adjust the pH of the solution to alkaline, and then add sodium acetate as a conductive salt, which not only helps to make the current distribution uniform, but also can reduce the solution voltage drop and thus reduce energy consumption. Further, adding OP-10 can reduce the surface tension of the solution and can ensure the removal of trace oil stains on the surface of the welding wire in an alkaline environment. Sodium thiosulfate, thiourea, and cuprous redimine in the stripping solution are all strong complexing agents for cuprous ions, which can promote the dissolution of metallic copper into cuprous ions in an alkaline environment and ensure the stability of cuprous ions; moreover, sodium thiosulfate, thiourea, and cuprous redimine are not strong complexing agents for ferrous ions and cannot dissolve steel in an alkaline environment. Therefore, when the welding wire is used as the anode for stripping, the stripping solution can only electrochemically etch the copper layer and has no erosion on the steel.
[0019] During the electrochemical stripping process of the defective coating, the welding wire moves continuously inside the cathode cavity as the anode, thus realizing continuous stripping. When stripping, keep the voltage between the anode and cathode at a relatively low voltage. At the anode, mainly the copper coating dissolves into cuprous ions, and at the cathode, mainly cuprous ions are reduced to metallic copper. Keeping the low voltage constant not only reduces energy consumption but also can reduce or avoid side reactions such as hydrogen evolution and oxygen evolution caused by high overpotential, and ensures the stability of the composition of the plating solution. When the anodic current efficiency is higher than the cathodic current efficiency, the long-term operation of the stripping solution will cause the concentration of cuprous ions to increase. When the copper content is higher than 10 g / L, the recycling and regeneration of the stripping solution can make cuprous ions, various anions, and various complexing agents crystallize out with cuprous ions at low temperature, so as to realize the removal of cuprous ions in the plating solution and complete the regeneration of the stripping solution.
[0020] Advantages of the present invention:
[0021] The electrochemically stripping solution does not contain strong oxidants such as chromic anhydride, and has little environmental pollution during the stripping process; the anodic and cathodic reactions are complementary reversible reactions to each other, the stripping solution system has good stability, and the stripping solution can be regenerated; the stripping solution only etches the copper coating without eroding the steel substrate; both the main anodic and cathodic reactions during the stripping process are single-electron processes, and the energy consumption during the stripping process is low. The present invention can solve the technical problems such as large pollution during the stripping process of carbon steel copper-plated welding wires, inability to regenerate the stripping solution, low economic efficiency, and serious erosion of the substrate, and is of great significance for the recycling of copper-plated welding wires and the improvement of the environmental protection and economic efficiency during the stripping process. Description of the Drawings
[0022] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.
[0023] Figure 1 It is a SEM image of the surface of a carbon steel copper-plated welding wire after electrochemically stripping through a defective coating in Test 1. Detailed Embodiments
[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0025] Embodiment 1
[0026] An electrochemically stripping method for defective coatings of carbon steel copper-plated welding wires includes:
[0027] (1) Preparation of the stripping solution: Weigh 3.0 - 10.0 g of borax, dissolve it in 500 mL of deionized water and stir evenly, then dissolve 15.0 - 50.0 g of sodium acetate, 1.0 - 2.0 g of OP-10, 2.0 - 5.0 g of composite antioxidant, 3.0 - 10.0 g of sodium thiosulfate, 50.0 - 80.0 g of thiourea and 200 mL of 10% Triton X-100 solution in sequence and stir evenly, then mix it evenly with 50 - 200 mL of 0.1 wt% bathocuproine ethanol solution, and finally add 3.0 - 10.0 g of cuprous chloride. After stirring until dissolved, add deionized water to 1000 mL to obtain the stripping solution;
[0028] (2) Electrochemical stripping of defective coating: A 316 stainless steel tube with an inner diameter of 20 mm and a length of 10 cm is used as the cathode. The welding wire to be stripped is used as the anode and placed in the inner cavity of the cathode tube, ensuring that the anode and cathode do not touch. The anode and cathode are immersed in the stripping solution and the temperature is maintained at 30 - 50 °C. The voltage between the anode and cathode is kept constant at 1.0 - 1.3 V, and the anode continuously moves in the inner cavity of the cathode tube at a speed of 2 cm / min. After the anode is removed from the stripping solution, it is washed with deionized water and dried to complete the electrochemical stripping;
[0029] (3) Recycling and regeneration of stripping solution: When the copper content in the stripping solution is higher than 10 g / L, the stripping solution is cooled to 1 - 5 °C and left standing for 12 h. The precipitated crystals are filtered out, and then the stripping solution is heated to 40 °C. Then, 0.5 - 2.0 g of composite antioxidant, 0.3 - 1.0 g of sodium thiosulfate, and 10 - 20 g of thiourea are dissolved in the stripping solution in sequence and stirred evenly to complete the regeneration of the stripping solution.
[0030] During the preparation of the stripping solution, borax is first used to adjust the pH of the solution to alkaline, and then sodium acetate is added as a conductive salt, which not only helps to evenly distribute the current but also reduces the voltage drop of the solution, thereby reducing energy consumption. Further, adding OP-10 can reduce the surface tension of the solution, which can ensure the removal of trace amounts of oil on the surface of the welding wire in an alkaline environment. Sodium thiosulfate, thiourea, and bathocuproine in the stripping solution are all strong complexing agents for cuprous ions, which can promote the dissolution of metallic copper into cuprous ions in an alkaline environment and ensure the stability of cuprous ions. Moreover, sodium thiosulfate, thiourea, and bathocuproine are not strong complexing agents for ferrous ions and cannot dissolve steel in an alkaline environment. Therefore, when the welding wire is used as the anode for stripping, the stripping solution can only electrochemically etch the copper layer and has no erosion on the steel.
[0031] During the electrochemical stripping of the defective coating, the welding wire as the anode continuously moves inside the cathode tube cavity, thus realizing continuous stripping. During stripping, the voltage between the anode and cathode is kept at a low voltage. The anode mainly dissolves the copper coating into cuprous ions, and the cathode mainly reduces cuprous ions to metallic copper. Keeping a constant low voltage not only reduces energy consumption but also reduces or avoids side reactions such as hydrogen evolution and oxygen evolution caused by high overpotential, ensuring the stability of the plating solution composition. When the anode current efficiency is higher than the cathode current efficiency, the long-term operation of the stripping solution will cause an increase in the concentration of cuprous ions. When the copper content is higher than 10 g / L, the recycling and regeneration of the stripping solution can cause cuprous ions, various anions, and various complexing agents to crystallize out with cuprous ions at low temperature, thereby realizing the removal of cuprous ions in the plating solution and completing the regeneration of the stripping solution.
[0032] The electrochemically stripping solution does not contain strong oxidants such as chromic anhydride, and has little environmental pollution during the stripping process; the anode and cathode reactions are complementary reversible reactions to each other, the stripping solution system has good stability, and the stripping solution can be regenerated; the stripping solution only etches the copper coating without eroding the steel substrate; both the main anode and cathode reactions during the stripping process are single-electron processes, and the energy consumption during the stripping process is low. This embodiment can solve the technical problems such as large pollution, inability to regenerate the stripping solution, low economic benefits, and serious erosion of the substrate during the stripping of copper-plated carbon steel welding wires.
[0033] Example 2
[0034] The difference between this specific embodiment and Specific Embodiment 1 is that the composite antioxidant described in steps (1) and (3) is a combination of two or three of sodium hypophosphite, sodium sulfite, sodium borohydride, or formaldehyde. Others are the same as Specific Embodiment 1.
[0035] Example 3
[0036] The difference between this specific embodiment and Embodiment 1 or 2 is that the voltage between the anode and cathode is kept constant at 1.1 - 1.25 V in step (2). Others are the same as Embodiment 1 or 2.
[0037] The following tests are used to verify the beneficial effects of the present invention when used for electrochemically stripping defective coatings of copper-plated carbon steel welding wires:
[0038] Test 1: An electrochemically stripping method for defective coatings of copper-plated carbon steel welding wires in this test is carried out according to the following steps:
[0039] (1) Preparation of the stripping solution: Weigh 3.0 g of borax and dissolve it in 500 mL of deionized water and stir evenly, then dissolve 50.0 g of sodium acetate, 1.0 g of OP-10, 2.0 g of the composite antioxidant, 3.0 g of sodium thiosulfate, 80.0 g of thiourea, and 200 mL of 10% Triton X-100 solution in sequence and stir evenly, then mix it evenly with 50 mL of 0.1 wt% ethanol solution of bathocuproine, and finally add 3.0 g of cuprous chloride. After stirring until dissolved, add deionized water to 1000 mL to obtain the stripping solution; the composite antioxidant therein is a combination of sodium hypophosphite and sodium sulfite;
[0040] (2) Electrochemical stripping of the defective coating: Use a 316 stainless steel tube with an inner diameter of 20 mm and a length of 10 cm as the cathode, and use the welding wire to be stripped as the anode and place it in the inner cavity of the cathode tube, ensuring that the anode and cathode do not touch. Immerse the anode and cathode in the stripping solution and keep the temperature at 30 °C. Keep the voltage between the anode and cathode constant at 1.3 V and make the anode continuously move in the inner cavity of the cathode tube at a speed of 2 cm / min. After the anode is removed from the stripping solution, wash it with deionized water and dry it to complete the electrochemical stripping;
[0041] After the electrochemically stripping of the defective coating in step (2) of this experiment, no copper element was detected on the surface of the carbon steel welding wire by EDX, and the surface was smooth and flat without over-corrosion, as shown in the SEM image of Figure 1 . To sum up, the stripping solution only etches the copper coating without eroding the steel substrate.
[0042] The copper content in the solution was measured every 24 h during the continuous operation of the stripping solution. After the stripping solution was continuously operated for 288 h, the copper content in the stripping solution was higher than 10 g / L, indicating that the anodic and cathodic reactions in the stripping process were well complementary, the stripping solution system had excellent stability, and the composition basically did not change.
[0043] At this time, the recycling and regeneration of the stripping solution in step (3) were carried out: the stripping solution was cooled to 1 °C and then left standing for 12 h. After the precipitated crystals were filtered out, the stripping solution was heated to 40 °C, and then 2.0 g of composite antioxidant, 1.0 g of sodium thiosulfate and 20 g of thiourea were successively dissolved in the stripping solution and stirred evenly to complete the regeneration of the stripping solution; the composite antioxidant was a combination of sodium hypophosphite and sodium sulfite.
[0044] After the regeneration of the stripping solution, the electrochemically stripping of the defective coating was carried out according to step (2), and still had excellent stripping effect.
[0045] Experiment 2: An electrochemically stripping method for defective coatings of copper-plated carbon steel welding wire in this experiment was carried out according to the following steps:
[0046] (1) Preparation of the stripping solution: Weigh 10.0 g of borax and dissolve it in 500 mL of deionized water and stir evenly. Then, 15.0 g of sodium acetate, 2.0 g of OP-10, 5.0 g of composite antioxidant, 10.0 g of sodium thiosulfate, 50.0 g of thiourea and 200 mL of 10% Triton X-100 solution were successively dissolved and stirred evenly, and then mixed evenly with 200 mL of 0.1 wt% ethanol solution of cuprous redimine. Finally, 10.0 g of cuprous chloride was added, and after stirring until dissolved, deionized water was added to 1000 mL to obtain the stripping solution; the composite antioxidant was a combination of sodium hypophosphite, sodium sulfite and sodium borohydride;
[0047] (2) Electrochemically stripping of the defective coating: A 316 stainless steel tube with an inner diameter of 20 mm and a length of 10 cm was used as the cathode, and the welding wire to be stripped was used as the anode and placed in the inner cavity of the cathode tube to ensure that the anode and cathode did not contact. The anode and cathode were immersed in the stripping solution and the temperature was maintained at 50 °C. The voltage between the anode and cathode was kept constant at 1.0 V and the anode continuously moved in the inner cavity of the cathode tube at a speed of 2 cm / min. After the anode was removed from the stripping solution, it was washed with deionized water and dried to complete the electrochemically stripping.
[0048] After the electrochemically stripping of the defective coating in step (2), the surface of the copper-plated carbon steel wire is smooth and flat, and there is no over-corrosion phenomenon. The presence of copper elements on the surface cannot be detected by EDX, indicating that the stripping solution only etches the copper coating without eroding the steel substrate.
[0049] The copper content in the stripping solution is measured every 24 consecutive hours of operation. After the stripping solution has been continuously operated for 360 h, the copper content in the stripping solution is higher than 10 g / L, indicating that the anodic and cathodic reactions in the stripping process are well complementary, the stripping solution system has excellent stability, and the composition basically does not change.
[0050] At this time, the cyclic regeneration of the stripping solution in step (3) is carried out: the stripping solution is cooled to 5 °C and then allowed to stand for 12 h. After the precipitated crystals are filtered out, the stripping solution is heated to 40 °C, and then 0.5 g of a composite antioxidant, 0.3 g of sodium thiosulfate, and 10 g of thiourea are successively dissolved in the stripping solution and stirred evenly to complete the regeneration of the stripping solution; the composite antioxidant is a combination of sodium hypophosphite, sodium sulfite, and sodium borohydride.
[0051] After the regeneration of the stripping solution, the electrochemically stripping of the defective coating is carried out according to step (2), and it still has excellent stripping effect.
[0052] Experiment 3: An electrochemically stripping method for the defective coating of copper-plated carbon steel wire in this experiment is carried out according to the following steps:
[0053] (1) Preparation of the stripping solution: Weigh 5.0 g of borax and dissolve it in 500 mL of deionized water and stir evenly. Then, 30.0 g of sodium acetate, 1.2 g of OP-10, 3.5 g of a composite antioxidant, 6.0 g of sodium thiosulfate, 60.0 g of thiourea, and 200 mL of 10% Triton X-100 solution are successively dissolved and stirred evenly. Then, it is mixed evenly with 90 mL of 0.1 wt% ethanol solution of cuprous thiocyanate. Finally, 7.2 g of cuprous chloride is added, and after stirring until dissolved, deionized water is added to 1000 mL to obtain the stripping solution; the composite antioxidant is a combination of sodium hypophosphite, sodium borohydride, and formaldehyde;
[0054] (2) Electrochemically stripping of the defective coating: A 316 stainless steel tube with an inner diameter of 20 mm and a length of 10 cm is used as the cathode, and the wire to be stripped is used as the anode and placed in the inner cavity of the cathode tube, ensuring that the anode and cathode do not touch. The anode and cathode are immersed in the stripping solution and the temperature is maintained at 45 °C. The voltage between the anode and cathode is kept constant at 1.2 V, and the anode continuously moves in the inner cavity of the cathode tube at a speed of 2 cm / min. After the anode is removed from the stripping solution, it is washed with deionized water and dried to complete the electrochemically stripping.
[0055] After the electrochemically stripping of the defective coating in step (2), the surface of the copper-plated carbon steel wire is smooth and flat, and there is no over-corrosion phenomenon. The presence of copper elements on the surface cannot be detected by EDX, indicating that the stripping solution only etches the copper coating without eroding the steel matrix.
[0056] The copper content in the stripping solution is measured every 24 hours of continuous operation. After the stripping solution has been continuously working for 336 hours, the copper content in the stripping solution is higher than 10 g / L, indicating that the anodic and cathodic reactions in the stripping process are complementary to each other, the stripping solution system has excellent stability, and the composition basically does not change.
[0057] At this time, the cyclic regeneration of the stripping solution in step (3) is carried out: the stripping solution is cooled to 3 °C and then left standing for 12 hours. After the precipitated crystals are filtered out, the stripping solution is heated to 40 °C, and then 1.2 g of a composite antioxidant, 0.6 g of sodium thiosulfate, and 15 g of thiourea are successively dissolved in the stripping solution and stirred evenly to complete the regeneration of the stripping solution; the composite antioxidant is a combination of sodium hypophosphite, sodium borohydride, and formaldehyde.
[0058] After the regeneration of the stripping solution, the electrochemically stripping of the defective coating is carried out according to step (2), and it still has excellent stripping effect.
[0059] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A stripping solution for defective coatings of copper-plated carbon steel welding wires, characterized in that, In every 1000 mL of the stripping solution, it includes the following raw materials: 3.0 - 10.0 g of borax, 15.0 - 50.0 g of sodium acetate, 1.0 - 2.0 g of OP-10, 2.0 - 5.0 g of compound antioxidant, 3.0 - 10.0 g of sodium thiosulfate, 50.0 - 80.0 g of thiourea, 200 mL of 10% Triton X-100 solution, 50 - 200 mL of 0.1 wt% bathocuproine ethanol solution, 3.0 - 10.0 g of cuprous chloride, and the balance is deionized water; The compound antioxidant is a combination of sodium hypophosphite and sodium sulfite, or a combination of sodium hypophosphite, sodium sulfite and sodium borohydride, or a combination of sodium hypophosphite, sodium borohydride and formaldehyde.
2. The preparation method of the stripping solution for defective coatings of copper-plated carbon steel welding wires according to claim 1, characterized in that It includes the following steps: Weigh 3.0 - 10.0 g of borax and dissolve it in 500 mL of deionized water and stir evenly, then dissolve 15.0 - 50.0 g of sodium acetate, 1.0 - 2.0 g of OP-10, 2.0 - 5.0 g of compound antioxidant, 3.0 - 10.0 g of sodium thiosulfate, 50.0 - 80.0 g of thiourea and 200 mL of 10% Triton X-100 solution in sequence and stir evenly, then mix it evenly with 50 - 200 mL of 0.1 wt% bathocuproine ethanol solution, and finally add 3.0 - 10.0 g of cuprous chloride, stir until dissolved and then add deionized water to 1000 mL to obtain the stripping solution.
3. An electrochemical stripping method for defective coatings of copper-plated carbon steel welding wires, characterized in that It includes the following steps: (1) Prepare the stripping solution described in Claim 1; (2) Electrochemical stripping of the defective coating: The stainless steel pipe is used as the cathode, and the welding wire to be stripped is used as the anode and placed in the cavity of the cathode tube. Immerse the cathode and anode in the stripping solution described in step (1) and keep the temperature at 30 - 50 °C. Keep the voltage between the cathode and anode constant at 1.0 - 1.3 V and make the anode continuously move in the cavity of the cathode tube at a speed of 2 cm / min. After the anode is taken out of the stripping solution, wash it with deionized water and dry it to complete the electrochemical stripping; (3) Recycling and regeneration of the stripping solution: When the copper content in the stripping solution described in step (2) is higher than 10 g / L, cool the stripping solution to 1 - 5 °C and let it stand for 12 h. Filter out the precipitated crystals, then heat the stripping solution to 40 °C, and then dissolve the compound antioxidant, sodium thiosulfate and thiourea in the stripping solution in sequence. Relative to 1000 mL of the stripping solution in step (1), the added compound antioxidant is 0.5 - 2.0 g, sodium thiosulfate is 0.3 - 1.0 g, and thiourea is 10 - 20 g, and stir evenly to complete the regeneration of the stripping solution.
4. The electrochemical stripping method for defective coatings of copper-plated carbon steel welding wires according to claim 3, characterized in that: Keep the voltage between the cathode and anode constant at 1.1 - 1.25 V.
Citation Information
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CN106048704A