CN110952104A - Method for preparing deep narrow gap consumable electrode gas shielded welding contact tip - Google Patents
Method for preparing deep narrow gap consumable electrode gas shielded welding contact tip Download PDFInfo
- Publication number
- CN110952104A CN110952104A CN201911317992.XA CN201911317992A CN110952104A CN 110952104 A CN110952104 A CN 110952104A CN 201911317992 A CN201911317992 A CN 201911317992A CN 110952104 A CN110952104 A CN 110952104A
- Authority
- CN
- China
- Prior art keywords
- copper
- contact tube
- aluminum
- copper contact
- micro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Coating With Molten Metal (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a method for preparing a deep narrow gap consumable electrode gas shielded welding contact tube, which takes a copper contact tube as a substrate; carrying out hot dip aluminum plating treatment on the copper contact tube by adopting a solvent method to plate an aluminum layer on the surface of the copper contact tube; and then, micro-arc oxidizing the aluminum layer of the copper contact tube in electrolyte to obtain the welding contact tube with the outer layer provided with the high-temperature-resistant and insulating ceramic coating. The contact tube film layer has the advantages of thin thickness, high resistivity, good wear resistance and high temperature resistance, breaks through the size limitation of the insulation treatment of the traditional narrow-gap gas metal arc welding contact tube, can be applied to the welding of deep and narrow-gap groove joints, and improves the welding efficiency.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a method for preparing a deep and narrow gap consumable electrode gas shielded welding contact tube.
Background
Narrow gap welding has been successfully applied to some large important structures, such as high speed train bodies, thick wall pressure vessels, boilers, large machinery, marine structures, hull construction, pressure pipelines, and the like. The traditional MIG welding has large heat input and high cost. The narrow gap welding reduces the consumption of filling metal and reduces the cost; the welding heat input is low, and the mechanical property of the welding seam is good; small deformation and easy control.
When welding in a deep and narrow groove, the front end of a welding wire is required to be extended into the groove, the contact tip is used for ensuring the straightness of the welding wire which is sent out, and electric arcs are generated at the end of the welding wire, so that the contact tip is required to be extended into the groove as shown in the ceramic coating schematic diagram of the contact tip, and due to the angle and the position deviation of the groove, the outer side of the contact tip is easy to contact with the side wall of the groove to discharge, the contact tip is easy to burn at high temperature, the stability of the welding process is influenced, and the. Meanwhile, the diameter of the contact tube is required to be as small as possible due to the limitation of the width of the narrow-gap groove.
In order to solve the problems of the contact tube, the invention patent application publication No. CN 106031959A designs a contact tube, wherein a layer of high-hardness material is sprayed on the outer wall of the front end of the contact tube, so that the service life of the contact tube is effectively prolonged. The invention patent application publication No. CN 10428799A also invents a narrow gap welding contact tip with an alumina insulation coating, and an insulation layer with certain thickness is obtained on the outer side of the part of the contact tip, which is deep into a groove of a workpiece, by means of flame spraying of the alumina coating, so that the outer wall of the contact tip is in contact with the inner side wall of the groove and the discharge phenomenon is not easy to occur, and the welding efficiency and the stability of the narrow gap groove are greatly improved. Utility model professional authorizationThe application number CN 203918196 designs a contact tube, and a metal ceramic shell is arranged outside the outlet end of the contact tube, so that the contact tube has the advantages of good wear resistance, high temperature resistance and high hardness, and frequent replacement is not needed, thereby prolonging the service life of the contact tube, improving the working efficiency and reducing the production cost. It can be seen that the above patent on the one hand obtains Al mainly by thermal spraying2O3Coating, however, copper contact tube has good heat conductivity, and thermal spraying of Al2O3The coating has higher difficulty, and the binding force between the coating and a copper matrix is lower, so that the coating is easy to fall off or crack locally, and has certain influence on the welding stability; on the other hand, the surface of the contact tube is insulated in a mode of adding a ceramic shell outside the contact tube, but the insulating layer of the method is too thick, the size of the electrode is increased, and the groove width is increased, so that the groove welding of the deep and narrow gaps is not facilitated.
The invention patent application publication No. CN 108004576 discloses a micro-arc oxidation process, which can obtain an 18-32 μm thin alumina ceramic insulating layer coating, the minimum voltage can be 200V to break down the alumina ceramic insulating layer coating, and the welding voltage is usually lower than 50V, therefore, the alumina ceramic insulating layer coating can isolate the contact nozzle from the inner side wall of the groove, and the contact discharge phenomenon can not occur. The melting point of alumina is about twice that of the copper contact tip base, and the higher the hardness, the more wear resistant, the alumina ceramic coating has a hardness of about 890HV, which is much greater than the hardness of the copper base of about 180 HV.
To sum up, how to obtain the alumina ceramic insulating layer with thinner thickness and extremely strong combination on the surface of the contact tube, the contact tube and the inner side wall of the groove are isolated, the contact discharge phenomenon cannot occur, and the problems of friction and abrasion resistance and high temperature resistance of the contact tube are needed to be solved at present.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a method for preparing a deep and narrow gap consumable electrode gas shielded welding contact tube, and the contact tube prepared by the method has the advantages of high resistivity, good wear resistance and high temperature resistance of a film layer through a hot dip coating and micro arc oxidation process; meanwhile, an aluminum oxide coating can be obtained on the copper contact tube with any shape, so that the diameter of the contact tube can be changed at will, the method is applied to the weld joint with any deep and narrow groove, the problem of burning loss caused by contact and ignition of the contact tube with a workpiece is solved, and the working environment of the contact tube is optimized.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for preparing a deep narrow gap consumable electrode gas shielded welding contact tube comprises the steps of carrying out aluminum plating treatment on a copper contact tube, and then carrying out micro-arc oxidation on an aluminum layer of the copper contact tube in electrolyte; the aluminum plating treatment mode is hot dip aluminum plating by a solvent method.
Further, the copper contact tube is a solid copper contact tube; the copper contact nozzle is used for a narrow gap groove of a welding line, and the width of the narrow gap groove is 4 mm. The welding seam is formed by putting the copper contact nozzle into the narrow gap groove and welding the copper contact nozzle and the narrow gap groove in the contact gap.
Further, the solvent method hot dip aluminum plating treatment copper contact tube comprises the following steps:
A. pretreating the copper conductive nozzle: the surface of the copper conductive nozzle is treated to be smooth and flat, and is cleaned by deionized water; then, soaking the copper contact tube in alcohol or acetone, and cleaning with deionized water; finally, immersing the copper conductive nozzle into an acid solution for pickling, and quickly cleaning the copper conductive nozzle by deionized water;
B. treating the copper conductive nozzle by a solvent method: b, placing the copper conductive nozzle prepared in the step A into a plating assistant agent solution, taking out, quickly drying and then preserving heat;
C. hot dip aluminum plating: and D, immersing the copper contact tube prepared in the step B into molten aluminum under an oxygen-free condition, so that the surface of the copper contact tube is coated with an aluminum layer.
The flux method is to protect the surface of the pretreated copper substrate with a specific flux or an aqueous solution of a solvent. The solvent is used for preventing the surface of the matrix from being secondarily oxidized, and simultaneously, when the copper sheet is immersed in the aluminum liquid, the surface activity of the copper and the wettability of the aluminum liquid are improved.
Further, in the step A, the copper contact tube is soaked in alcohol or acetone for 6-15min, the deionized water washing time is 0-20s, the concentration of the pickling solution is 10-50g/L, the temperature is 30-50 ℃, and the soaking time is 1-5 min.
Further, in the step B, the concentration of the plating assistant agent solution is 1-10%, and the plating assistant agent is KF and NH4Cl and ZnCl2In one of the plating assistant agent solution, the initial temperature of the plating assistant agent solution is 70-80 ℃, and the processing time of the plating assistant agent solution is 1-5 min. The plating assistant aims to prevent the copper surface from being oxidized by air again, and then the activity of the copper surface is improved during hot dip plating, incomplete spreading of the surface of the plating assistant is caused by too short time or low temperature, and the activity of the plating assistant is influenced by too long time or high temperature.
Furthermore, in the step C, the temperature of the molten aluminum is 660-750 ℃, the hot dipping time of the copper conducting nozzle is 6-30s, the copper is unevenly spread in an excessively short time, the plating leakage condition occurs, and the copper is partially melted in an excessively long time, so that the workpiece forming is influenced.
Further, the electrolyte comprises Na2SiO3-9H2O、KOH、30％H2O2、EDTA-2Na、Na2WO4·2H2O、NH4VO3、(NaPO3)6And water, Na being in the electrolyte2SiO3-9H2The concentration of O is 10-30g/L, the concentration of KOH is 1-5g/L, and the concentration of H is 30%2O2The concentration of the EDTA-2Na is 1-12g/L, the concentration of the EDTA-2Na is 0.5-3g/L, and the Na2WO4·2H2O concentration of 0.5-4g/L, NH4VO3The concentration of (A) is 0.5-4g/L, (NaPO)3)6The concentration of (A) is 1-16 g/L. Compared with acid electrolyte, the alkaline electrolyte system is more environment-friendly and the film quality is easier to control, so the invention adopts the alkaline electrolyte system, wherein the silicate system can promote the passivation of the surface of the aluminum alloy and form a silicon-containing oxide film with better corrosion resistance in a wider electrolyte temperature and oxidation current range, and the alkaline electrolyte system is the main salt solution which is most widely applied at present.
Furthermore, the aluminum layer of the micro-arc copper oxide contact tube in the electrolyte adopts a positive and negative pulse power supply.
Further, the voltage of the positive and negative pulse power supply is 400-700V, and the current density is 1-6A/dm2The pulse frequency is 300-800Hz, and the duty ratio is 10-80%.
Furthermore, the micro-arc oxidation time is 10-50min, the thickness of the micro-arc oxidation film is smaller than 10min, the micro-arc oxidation film is basically unchanged when the micro-arc oxidation film exceeds 50min, and the temperature of the workpiece is higher and higher.
The invention aims to prepare a contact tube, and the film layer of the contact tube has the advantages of high resistivity, good wear resistance and high temperature resistance. The narrow gap welding is a high-efficiency welding method for completing the whole welding seam by adopting gas metal arc welding or arc welding, wherein a groove is not formed or only a small-angle groove is formed before the butt joint of the thick plate is welded, and a narrow and deep gap is reserved. The invention can obtain an alumina coating on a copper contact tube with any shape by a hot dipping and micro-arc oxidation process, so the diameter of the contact tube can be changed at will, the invention is applied to a deep and narrow groove weld seam with the size slightly larger than that of the copper contact tube, solves the problem of burning loss caused by contact and ignition of the contact tube with a workpiece, and optimizes the working environment of the contact tube.
The specification and the structural form of the contact tube required by the narrow-gap groove weld joint are selected, the hot dipping technology is adopted on the outer layer of the contact tube, the surface of the contact tube is plated with an aluminum coating, then the aluminum-plated contact tube is placed into an electrolytic bath, and the micro-arc oxidation technology is adopted to generate an aluminum oxide ceramic layer on the aluminum coating, so that the copper contact tube has the advantages of high resistivity, good wear resistance and high temperature resistance.
The invention has the beneficial effects that:
1) according to the invention, the aluminum oxide ceramic insulating layer with a relatively thin thickness and strong bonding strength is obtained on the surface of the contact tube by adopting the solvent method hot dipping and micro-arc oxidation technology, so that the contact tube is isolated from the inner side wall of the groove, the contact discharge phenomenon is avoided, and the friction, abrasion and high temperature resistance of the contact tube are improved;
2) the aluminum oxide coating can be obtained on the copper contact tube with any shape by a solvent method hot dipping and micro-arc oxidation process, so that the diameter of the contact tube can be changed at will, the aluminum oxide coating is applied to the weld joint with any deep and narrow groove, the problem of burning loss caused by contact and ignition of the contact tube and a workpiece is solved, and the working environment of the contact tube is optimized.
Drawings
FIG. 1 is a schematic view of a ceramic coating for a contact tip according to the present invention;
FIG. 2 is a schematic view of micro-arc oxidation of a contact tip according to the present invention;
1-welded workpiece, 2-welding wire, 3-copper contact tip, 4-Cu-Al layer, 5-Al2O36-MAO30 micro-arc oxidation power supply, 7-electrolytic bath, 8-heat exchanger, 9-cooling device, 10-electrolyte, 11-hot dip aluminized contact nozzle, and 12-micro-arc oxidized contact nozzle.
Detailed Description
In order to further illustrate the technical effects of the present invention, the present invention is specifically described below by way of examples.
Example 1
1) The solid copper contact tube matched with the narrow-gap groove weld joint is obtained by a machining method, and the aluminum oxide coating can be plated on the copper contact tube with the diameter of 3.2 mm.
2) Carrying out hot dip aluminum plating treatment on the copper contact nozzle in the step 1) by adopting a solvent method:
polishing the copper surface with sand paper to brightness, cleaning with deionized water, soaking the copper surface with alcohol for 10min, cleaning with deionized water, and soaking the copper surface in H at 40 deg.C and 15g/L2SO4The solution is put for 2 minutes and then is quickly washed by deionized water; and putting the copper alloy into a plating assistant agent solution of KF with the temperature of 80 ℃ and the concentration of 3 percent for 3 minutes, then taking out the copper alloy for quick drying, preserving heat for a certain time, and immersing the copper alloy into molten aluminum, wherein the hot dipping temperature is about 700 ℃, and the hot dipping time is 8s, so that a sealing aluminum layer is plated on the surface of copper, the thickness is about 10 mu m, and the aluminum coating must have no plating leakage.
3) Preparing micro-arc oxidation electrolyte by adopting the copper conductive nozzle aluminum layer prepared in the micro-arc oxidation treatment step 2). In the presence of selected Na2SiO3And KOH is used as a micro-arc oxidation base solution, and then a reasonable additive is selected for an electrolyte system. The electrolyte consists of the following components in concentration: 24g/LNa2SiO3-9H2O，3g/LKOH、6g/LH2O2，1g/L EDTA-2Na，2g/L Na2WO4·2H2O，2g/L NH4VO3，8g/L(NaPO3)6And the balance of deionized water. The introduction of the additive is mainly considered in the following aspects: to promote passivation of the 7N01 aluminum alloy, (NaPO) was selected3)6As the passivating agent, (NaPO) simultaneously3)6The complexing effect is also realized, so that the film growth efficiency can be improved; in order to inhibit the point discharge on the surface of the membrane and improve the stability of the electrolyte, EDTA-2Na is selected as a stabilizer; in order to improve the oxygen content of the solution, reduce the arcing voltage and promote the micro-arc discharge, H is added2O2As an oxygen donor; to increase the depth of color of the film, NH is selected4VO3As the main colorant, Na was selected2WO4As an auxiliary colorant.
4) Carrying out micro-arc oxidation treatment on the aluminum layer of the copper conductive nozzle prepared in the step 2): the aluminum layer of the micro-arc copper oxide contact tube in the prepared electrolyte adopts a positive and negative pulse power supply, the pulse frequency is 500Hz, the positive voltage is 400V, the current density is about 3A/dm2, the duty ratio is 20 percent, and the micro-arc oxidation time is 20min to obtain Al2O3Coating thickness of about 30 μm.
5) And drilling the center of the copper contact nozzle subjected to micro-arc oxidation to meet the wire feeding diameter, and sleeving threads at the rear end of the copper contact nozzle.
The bonding strength of the treated copper contact tube is about 40N, the treated copper contact tube has strong bonding force and the hardness of 600HV, and a groove with the width of about 4mm at the bottom of a narrow-gap groove can be welded according to the diameter of the treated contact tube, so that the working efficiency is improved, and the production cost is reduced.
Example 2
1) The solid copper contact tube matched with the narrow-gap groove weld joint is obtained by a machining method, and the aluminum oxide coating can be plated on the copper contact tube with the diameter of 3.2 mm.
2) Carrying out hot dip aluminum plating treatment on the copper contact nozzle in the step 1) by adopting a solvent method:
polishing the copper surface with sand paper to brightness, cleaning with deionized water, soaking the copper surface with alcohol for 6 min, washing with deionized water for 10s, and soaking the copper surface in 10g/L H at 30 deg.C2SO4In solution for 1 minute, then quickly removedWashing with ionized water; and putting the copper plate into a KF plating assistant agent solution with the temperature of 70 ℃ and the concentration of 1 percent for 1 minute, then taking out the copper plate for quick drying, preserving heat for a certain time, and immersing the copper plate into molten aluminum, wherein the hot dipping temperature is about 660 ℃, and the hot dipping time is 6s, so that a sealing aluminum layer is plated on the surface of the copper, the thickness is about 7 mu m, and the aluminum coating must have no plating leakage.
3) Preparing micro-arc oxidation electrolyte by adopting the copper conductive nozzle aluminum layer prepared in the micro-arc oxidation treatment step 2). In the presence of selected Na2SiO3And KOH is used as a micro-arc oxidation base solution, and then a reasonable additive is selected for an electrolyte system. The electrolyte consists of the following components in concentration: 10g/L Na2SiO3-9H2O、1g/L KOH、1g/L H2O2、0.5g/L EDTA-2Na、0.5g/LNa2WO4·2H2O、0.5g/LNH4VO3、1g/L(NaPO3)6And the balance of deionized water. The introduction of the additive is mainly considered in the following aspects: to promote passivation of the 7N01 aluminum alloy, (NaPO) was selected3)6As the passivating agent, (NaPO) simultaneously3)6The complexing effect is also realized, so that the film growth efficiency can be improved; in order to inhibit the point discharge on the surface of the membrane and improve the stability of the electrolyte, EDTA-2Na is selected as a stabilizer; in order to improve the oxygen content of the solution, reduce the arcing voltage and promote the micro-arc discharge, H is added2O2As an oxygen donor; to increase the depth of color of the film, NH is selected4VO3As the main colorant, Na was selected2WO4As an auxiliary colorant.
4) Carrying out micro-arc oxidation treatment on the aluminum layer of the copper conductive nozzle prepared in the step 2): the aluminum layer of the micro-arc copper oxide contact tube in the prepared electrolyte adopts a positive and negative pulse power supply, the pulse frequency is 800Hz, the positive voltage is 400V, the current density is about 1A/dm2, the duty ratio is 10 percent, and the micro-arc oxidation time is 10min to obtain Al2O3Coating thickness of about 30 μm.
5) And drilling the center of the copper contact nozzle subjected to micro-arc oxidation to meet the wire feeding diameter, and sleeving threads at the rear end of the copper contact nozzle.
The bonding strength of the treated copper contact tube is about 27N, the treated copper contact tube has strong bonding force and the hardness of 600HV, and a groove with the width of about 4mm at the bottom of a narrow-gap groove can be welded according to the diameter of the treated contact tube, so that the working efficiency is improved, and the production cost is reduced.
Example 3
1) The solid copper contact tube matched with the narrow-gap groove weld joint is obtained by a machining method, and the aluminum oxide coating can be plated on the copper contact tube with the diameter of 3.2 mm.
2) Carrying out hot dip aluminum plating treatment on the copper contact nozzle in the step 1) by adopting a solvent method:
polishing the copper surface with sand paper to brightness, cleaning with deionized water, soaking the copper surface with alcohol for 15min, washing with deionized water for 10s, and soaking the copper surface in 50 deg.C and 50g/L H2SO4After 5 minutes in the solution, the solution is quickly washed by deionized water; and putting the copper alloy into a plating assistant agent solution of KF with the temperature of 80 ℃ and the concentration of 10 percent for 5 minutes, then taking out the copper alloy for quick drying, preserving heat for a certain time, and immersing the copper alloy into molten aluminum, wherein the hot dipping temperature is about 750 ℃, and the hot dipping time is 30s, so that a sealing aluminum layer is plated on the surface of copper, the thickness is about 9 mu m, and the aluminum coating must have no plating leakage.
3) Preparing micro-arc oxidation electrolyte by adopting the copper conductive nozzle aluminum layer prepared in the micro-arc oxidation treatment step 2). In the presence of selected Na2SiO3And KOH is used as a micro-arc oxidation base solution, and then a reasonable additive is selected for an electrolyte system. The electrolyte consists of the following components in concentration: 30g/LNa2SiO3-9H2O、5g/L KOH、12g/L H2O2、2g/L EDTA-2Na、4g/LNa2WO4·2H2O、4g/LNH4VO3、16g/L(NaPO3)6And the balance of deionized water. The introduction of the additive is mainly considered in the following aspects: to promote passivation of the 7N01 aluminum alloy, (NaPO) was selected3)6As the passivating agent, (NaPO) simultaneously3)6The complexing effect is also realized, so that the film growth efficiency can be improved; in order to inhibit the point discharge on the surface of the membrane and improve the stability of the electrolyte, EDTA-2Na is selected as a stabilizer; in order to improve the oxygen content of the solution, reduce the arcing voltage and promote the micro-arc discharge, H is added2O2As an oxygen donor; to increase the depth of color of the film, NH is selected4VO3As the main colorant, Na was selected2WO4As an auxiliary colorant.
4) Carrying out micro-arc oxidation treatment on the aluminum layer of the copper conductive nozzle prepared in the step 2): the aluminum layer of the micro-arc copper oxide contact tube in the prepared electrolyte adopts a positive and negative pulse power supply, the pulse frequency is 800Hz, the positive voltage is 700V, the current density is about 6A/dm2, the duty ratio is 80 percent, and the micro-arc oxidation time is 50min to obtain Al2O3Coating thickness of about 19 μm.
5) And drilling the center of the copper contact nozzle subjected to micro-arc oxidation to meet the wire feeding diameter, and sleeving threads at the rear end of the copper contact nozzle.
The bonding strength of the treated copper contact tube is about 42N, the treated copper contact tube has strong bonding force and the hardness of 600HV, and a groove with the width of about 4mm at the bottom of a narrow-gap groove can be welded according to the diameter of the treated contact tube, so that the working efficiency is improved, and the production cost is reduced.
Example 4
1) The solid copper contact tube matched with the narrow-gap groove weld joint is obtained by a machining method, and the aluminum oxide coating can be plated on the copper contact tube with the diameter of 3.2 mm.
2) Carrying out hot dip aluminum plating treatment on the copper contact nozzle in the step 1) by adopting a solvent method:
polishing the copper surface with sand paper to brightness, cleaning with deionized water, soaking the copper surface with alcohol for 10min, washing with deionized water for 10s, and soaking the copper surface in 30g/L H at 40 deg.C2SO4The solution is put for 2 minutes and then is quickly washed by deionized water; and putting the copper alloy into a plating assistant agent solution of KF with the temperature of 80 ℃ and the concentration of 3 percent for 3 minutes, then taking out the copper alloy for quick drying, preserving heat for a certain time, and immersing the copper alloy into molten aluminum, wherein the hot dipping temperature is about 700 ℃, and the hot dipping time is 8s, so that a sealing aluminum layer is plated on the surface of copper, the thickness is about 10 mu m, and the aluminum coating must have no plating leakage.
3) Preparing micro-arc oxidation electrolyte by adopting the copper conductive nozzle aluminum layer prepared in the micro-arc oxidation treatment step 2). In the presence of selected Na2SiO3And KOH asAfter the base solution is subjected to micro-arc oxidation, a reasonable additive is selected for the electrolyte system. The electrolyte consists of the following components in concentration: 15g/LNa2SiO3-9H2O、2g/LKOH、3g/LH2O2、1g/L EDTA-2Na、2g/L Na2WO4·2H2O、2g/L NH4VO3、8g/L(NaPO3)6And the balance of deionized water. The introduction of the additive is mainly considered in the following aspects: to promote passivation of the 7N01 aluminum alloy, (NaPO) was selected3)6As the passivating agent, (NaPO) simultaneously3)6The complexing effect is also realized, so that the film growth efficiency can be improved; in order to inhibit the point discharge on the surface of the membrane and improve the stability of the electrolyte, EDTA-2Na is selected as a stabilizer; in order to improve the oxygen content of the solution, reduce the arcing voltage and promote the micro-arc discharge, H is added2O2As an oxygen donor; to increase the depth of color of the film, NH is selected4VO3As the main colorant, Na was selected2WO4As an auxiliary colorant.
4) Carrying out micro-arc oxidation treatment on the aluminum layer of the copper conductive nozzle prepared in the step 2): the aluminum layer of the micro-arc copper oxide contact tube in the prepared electrolyte adopts a positive and negative pulse power supply, the pulse frequency is 500Hz, the positive voltage is 400V, the current density is about 2A/dm2, the duty ratio is 20 percent, and the micro-arc oxidation time is 20min to obtain Al2O3Coating thickness of about 32 μm.
5) And drilling the center of the copper contact nozzle subjected to micro-arc oxidation to meet the wire feeding diameter, and sleeving threads at the rear end of the copper contact nozzle.
The bonding strength of the treated copper contact tube is about 40N, the treated copper contact tube has strong bonding force and the hardness of 600HV, and a groove with the width of about 4mm at the bottom of a narrow-gap groove can be welded according to the diameter of the treated contact tube, so that the working efficiency is improved, and the production cost is reduced.
Example 5
1) The solid copper contact tube matched with the narrow-gap groove weld joint is obtained by a machining method, and the aluminum oxide coating can be plated on the copper contact tube with the diameter of 3.2 mm.
2) Carrying out hot dip aluminum plating treatment on the copper contact nozzle in the step 1) by adopting a solvent method:
polishing the copper surface with sand paper to brightness, cleaning with deionized water, soaking the copper surface with alcohol for 10min, washing with deionized water for 10s, and soaking the copper surface in 50g/L H at 40 deg.C2SO4The solution is put for 2 minutes and then is quickly washed by deionized water; and putting the copper alloy into a plating assistant agent solution of KF with the temperature of 80 ℃ and the concentration of 3 percent for 3 minutes, then taking out the copper alloy for quick drying, preserving heat for a certain time, and immersing the copper alloy into molten aluminum, wherein the hot dipping temperature is about 700 ℃, and the hot dipping time is 8s, so that a sealing aluminum layer is plated on the surface of copper, the thickness is about 10 mu m, and the aluminum coating must have no plating leakage.
3) Preparing micro-arc oxidation electrolyte by adopting the copper conductive nozzle aluminum layer prepared in the micro-arc oxidation treatment step 2). In the presence of selected Na2SiO3And KOH is used as a micro-arc oxidation base solution, and then a reasonable additive is selected for an electrolyte system. The electrolyte consists of the following components in concentration: 27g/LNa2SiO3-9H2O、4g/LKOH、9g/LH2O2、1g/L EDTA-2Na、2g/L Na2WO4·2H2O、2g/L NH4VO3、8g/L(NaPO3)6And the balance of deionized water. The introduction of the additive is mainly considered in the following aspects: to promote passivation of the 7N01 aluminum alloy, (NaPO) was selected3)6As the passivating agent, (NaPO) simultaneously3)6The complexing effect is also realized, so that the film growth efficiency can be improved; in order to inhibit the point discharge on the surface of the membrane and improve the stability of the electrolyte, EDTA-2Na is selected as a stabilizer; in order to improve the oxygen content of the solution, reduce the arcing voltage and promote the micro-arc discharge, H is added2O2As an oxygen donor; to increase the depth of color of the film, NH is selected4VO3As the main colorant, Na was selected2WO4As an auxiliary colorant.
4) Carrying out micro-arc oxidation treatment on the aluminum layer of the copper conductive nozzle prepared in the step 2): the aluminum layer of the micro-arc copper oxide contact tube in the prepared electrolyte adopts a positive and negative pulse power supply, the pulse frequency is 500Hz, the positive voltage is 400V, the current density is about 5A/dm2, the duty ratio is 20 percent, and the micro-arc oxidation time isFor 20min, Al is obtained2O3Coating, the thickness of the coating is about 21 μm.
5) And drilling the center of the copper contact nozzle subjected to micro-arc oxidation to meet the wire feeding diameter, and sleeving threads at the rear end of the copper contact nozzle.
The bonding strength of the treated copper contact tube is about 40N, the treated copper contact tube has strong bonding force and the hardness of 600HV, and a groove with the width of about 4mm at the bottom of a narrow-gap groove can be welded according to the diameter of the treated contact tube, so that the working efficiency is improved, and the production cost is reduced.
Example 6
1) The solid copper contact tube matched with the narrow-gap groove weld joint is obtained by a machining method, and the aluminum oxide coating can be plated on the copper contact tube with the diameter of 3.2 mm.
2) Carrying out hot dip aluminum plating treatment on the copper contact nozzle in the step 1) by adopting a solvent method:
polishing the copper surface with sand paper to brightness, cleaning with deionized water, soaking the copper surface with alcohol for 10min, washing with deionized water for 10s, and soaking the copper surface in H at 40 deg.C and 15g/L2SO4The solution is put for 2 minutes and then is quickly washed by deionized water; and put into a furnace at 80 ℃ and 3% NH4And (3) taking the solution of the plating assistant agent of Cl out for 3 minutes, then taking the solution out for quick drying, preserving heat for a certain time, and then immersing the solution into molten aluminum, wherein the hot dipping temperature is about 700 ℃, and the hot dipping time is 8s, so that a sealing aluminum layer is plated on the surface of copper, the thickness is about 6 mu m, and the aluminum coating must not leak plating.
3) Preparing micro-arc oxidation electrolyte by adopting the copper conductive nozzle aluminum layer prepared in the micro-arc oxidation treatment step 2). In the presence of selected Na2SiO3And KOH is used as a micro-arc oxidation base solution, and then a reasonable additive is selected for an electrolyte system. The electrolyte consists of the following components in concentration: 24g/LNa2SiO3-9H2O、4g/LKOH、9g/LH2O2、1g/L EDTA-2Na、2g/L Na2WO4·2H2O、2g/L NH4VO3、8g/L(NaPO3)6And the balance of deionized water. The introduction of the additive is mainly considered in the following aspects: to promote dulling of 7N01 aluminum alloyTransformation, selection (NaPO)3)6As the passivating agent, (NaPO) simultaneously3)6The complexing effect is also realized, so that the film growth efficiency can be improved; in order to inhibit the point discharge on the surface of the membrane and improve the stability of the electrolyte, EDTA-2Na is selected as a stabilizer; in order to improve the oxygen content of the solution, reduce the arcing voltage and promote the micro-arc discharge, H is added2O2As an oxygen donor; to increase the depth of color of the film, NH is selected4VO3As the main colorant, Na was selected2WO4As an auxiliary colorant.
4) Carrying out micro-arc oxidation treatment on the aluminum layer of the copper conductive nozzle prepared in the step 2): the aluminum layer of the micro-arc copper oxide contact tube in the prepared electrolyte adopts a positive and negative pulse power supply, the pulse frequency is 500Hz, the positive voltage is 400V, the current density is about 3A/dm2, the duty ratio is 20 percent, and the micro-arc oxidation time is 20min to obtain Al2O3Coating thickness of about 30 μm.
5) And drilling the center of the copper contact nozzle subjected to micro-arc oxidation to meet the wire feeding diameter, and sleeving threads at the rear end of the copper contact nozzle.
The bonding strength of the treated copper contact tube is about 25N, the treated copper contact tube has strong bonding force and the hardness of 600HV, and a groove with the width of about 4mm at the bottom of a narrow-gap groove can be welded according to the diameter of the treated contact tube.
TABLE 1 Experimental data
As seen from the chart, the aluminum oxide ceramic insulating layer with small thickness and strong bonding strength is obtained on the surface of the contact tube by adopting the solvent method hot dipping and the micro-arc oxidation technology, the treated copper contact tube has strong bonding strength, a groove with the width of about 4mm at the bottom of a narrow-gap groove can be welded according to the diameter of the treated contact tube, meanwhile, the aluminum oxide ceramic insulating layer isolates the contact tube from the inner side wall of the groove, the contact discharge phenomenon cannot occur, and the friction, wear and high temperature resistance of the contact tube are improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the technical solutions of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the present invention, which should be covered by the protection scope of the present invention.
Claims (10)
1. A method for preparing a deep narrow gap consumable electrode gas shielded welding contact tip is characterized in that a copper contact tip is aluminized, and then an aluminum layer of the copper contact tip is micro-arc oxidized in electrolyte; the aluminum plating treatment mode is hot dip aluminum plating by a solvent method.
2. The production method according to claim 1, wherein the copper contact tip is a solid copper contact tip; the copper contact nozzle is used for a narrow gap groove of a welding line, and the width of the narrow gap groove is more than or equal to 4 mm.
3. The production method according to claim 1, wherein the solvent hot dip aluminum-treated copper contact tip comprises the steps of:
A. pretreating the copper conductive nozzle: the surface of the copper conductive nozzle is treated to be smooth and flat, and is cleaned by deionized water; then, soaking the copper contact tube in alcohol or acetone, and cleaning with deionized water; finally, immersing the copper conductive nozzle into an acid solution for pickling, and quickly cleaning the copper conductive nozzle by deionized water;
B. treating the copper conductive nozzle by a solvent method: b, placing the copper conductive nozzle prepared in the step A into a plating assistant agent solution, and then taking out and quickly drying;
C. hot dip aluminum plating: and D, immersing the copper contact tube prepared in the step B into molten aluminum under an oxygen-free condition, so that the surface of the copper contact tube is coated with an aluminum layer.
4. The method according to claim 3, wherein the soaking time of the copper contact tube with alcohol or acetone in step A is 6-15min, and the deionized water rinsing time of the copper contact tube after the soaking with alcohol or acetone is 0-20 s; the concentration of the acid washing solution is 10-50g/L, the temperature is 30-50 ℃, and the soaking time is 1-5 min.
5. The preparation method according to claim 3, wherein the plating assistant agent in the plating assistant agent solution in the step B is 1-10% by mass, and the plating assistant agent is KF or NH4Cl and ZnCl2In one of the plating assistant agent solution, the initial temperature of the plating assistant agent solution is 70-80 ℃, and the processing time of the plating assistant agent solution is 1-5 min.
6. The method as claimed in claim 3, wherein the temperature of the molten aluminum in step C is 660-750 ℃, and the hot dip coating time of the copper contact nozzle is 6-30 s.
7. The method according to claim 1, wherein the electrolyte comprises Na2SiO3-9H2O、KOH、30％H2O2、EDTA-2Na、Na2WO4·2H2O、NH4VO3、(NaPO3)6And water;
na in the electrolyte2SiO3-9H2The concentration of O is 10-30g/L, the concentration of KOH is 1-5g/L, and the concentration of H is 30%2O2The concentration of the EDTA-2Na is 1-12g/L, the concentration of the EDTA-2Na is 0.5-3g/L, and the Na2WO4·2H2O concentration of 0.5-4g/L, NH4VO3The concentration of (A) is 0.5-4g/L, (NaPO)3)6The concentration of (A) is 1-16 g/L.
8. The method for preparing the copper alloy electrode according to claim 1, wherein the aluminum layer of the micro-arc copper oxide contact tip is a positive and negative pulse power supply in the electrolyte.
9. The method of claim 8, wherein the method comprisesThe voltage of the positive and negative pulse power supply is 400-700V, and the current density is 1-6A/dm2The pulse frequency is 300-800Hz, and the duty ratio is 10-80%.
10. The method of claim 1, wherein the micro-arc oxidation time is 10-50 min.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910763800.1A CN110453228A (en) | 2019-08-19 | 2019-08-19 | A kind of preparation method of depth narrow-gap gas metal arc welding ignition tip |
| CN2019107638001 | 2019-08-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110952104A true CN110952104A (en) | 2020-04-03 |
| CN110952104B CN110952104B (en) | 2021-09-03 |
Family
ID=68487491
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910763800.1A Pending CN110453228A (en) | 2019-08-19 | 2019-08-19 | A kind of preparation method of depth narrow-gap gas metal arc welding ignition tip |
| CN201911317992.XA Active CN110952104B (en) | 2019-08-19 | 2019-12-19 | Method for preparing deep narrow gap consumable electrode gas shielded welding contact tip |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910763800.1A Pending CN110453228A (en) | 2019-08-19 | 2019-08-19 | A kind of preparation method of depth narrow-gap gas metal arc welding ignition tip |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN110453228A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763898A (en) * | 2020-06-01 | 2020-10-13 | 武汉大学 | Metal surface treatment for electrical insulation equipment for preventing C5F10O gas etching method |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3825719A (en) * | 1972-06-22 | 1974-07-23 | Elektriska Svetsnings Ab | Contact nozzle for a continuous arc welding electrode |
| CN101104918A (en) * | 2007-08-07 | 2008-01-16 | 大连理工大学 | Method for modifying copper-aluminum metallurgy combination interface by auxiliary coating agent |
| CN101195915A (en) * | 2007-12-20 | 2008-06-11 | 大连交通大学 | Method for acquiring ceramic layer on iron base, copper base material surface |
| CN203091945U (en) * | 2012-11-22 | 2013-07-31 | 北京二七轨道交通装备有限责任公司 | Alumina ceramic current divider and mechanical arm welding gun |
| CN103981498A (en) * | 2014-04-30 | 2014-08-13 | 南昌航空大学 | Method for improving wear resistant property of metal material |
| CN104289799A (en) * | 2014-09-25 | 2015-01-21 | 北京石油化工学院 | Narrow gap welding current contact nozzle with aluminum oxide insulating coating |
| CN104404434A (en) * | 2014-11-05 | 2015-03-11 | 昆明理工大学 | Ceramic coating of metal material surface and preparation method thereof |
| CN105331941A (en) * | 2015-10-09 | 2016-02-17 | 湖南大学 | Micro-arc oxidation method for surfaces of copper, copper alloy, zinc and zinc alloy |
| WO2016056943A1 (en) * | 2014-10-09 | 2016-04-14 | Дмитрий Александрович ЛЕБЕДЕВ | Catalytically active coating on the surface of an internal combustion engine chamber |
| CN106702330A (en) * | 2015-11-12 | 2017-05-24 | 中国科学院金属研究所 | Carbon steel or stainless steel surface micro-arc oxidation ceramic coating based on aluminized coating, and preparation method thereof |
| CN109338362A (en) * | 2018-10-29 | 2019-02-15 | 河北工业大学 | A method of wear-resistant ceramic layer is prepared in Surface Quenching of High-Phosphorus Cast |
| CN110016708A (en) * | 2019-04-16 | 2019-07-16 | 湖南大学 | Suitable for copper and its micro-arc oxidization surface processing method and product of alloy |
| CN110158134A (en) * | 2019-06-10 | 2019-08-23 | 陕西天元智能再制造股份有限公司 | A kind of workpiece surface processing method that cold spraying is combined with differential arc oxidation |
-
2019
- 2019-08-19 CN CN201910763800.1A patent/CN110453228A/en active Pending
- 2019-12-19 CN CN201911317992.XA patent/CN110952104B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3825719A (en) * | 1972-06-22 | 1974-07-23 | Elektriska Svetsnings Ab | Contact nozzle for a continuous arc welding electrode |
| CN101104918A (en) * | 2007-08-07 | 2008-01-16 | 大连理工大学 | Method for modifying copper-aluminum metallurgy combination interface by auxiliary coating agent |
| CN101195915A (en) * | 2007-12-20 | 2008-06-11 | 大连交通大学 | Method for acquiring ceramic layer on iron base, copper base material surface |
| CN203091945U (en) * | 2012-11-22 | 2013-07-31 | 北京二七轨道交通装备有限责任公司 | Alumina ceramic current divider and mechanical arm welding gun |
| CN103981498A (en) * | 2014-04-30 | 2014-08-13 | 南昌航空大学 | Method for improving wear resistant property of metal material |
| CN104289799A (en) * | 2014-09-25 | 2015-01-21 | 北京石油化工学院 | Narrow gap welding current contact nozzle with aluminum oxide insulating coating |
| WO2016056943A1 (en) * | 2014-10-09 | 2016-04-14 | Дмитрий Александрович ЛЕБЕДЕВ | Catalytically active coating on the surface of an internal combustion engine chamber |
| CN104404434A (en) * | 2014-11-05 | 2015-03-11 | 昆明理工大学 | Ceramic coating of metal material surface and preparation method thereof |
| CN105331941A (en) * | 2015-10-09 | 2016-02-17 | 湖南大学 | Micro-arc oxidation method for surfaces of copper, copper alloy, zinc and zinc alloy |
| CN106702330A (en) * | 2015-11-12 | 2017-05-24 | 中国科学院金属研究所 | Carbon steel or stainless steel surface micro-arc oxidation ceramic coating based on aluminized coating, and preparation method thereof |
| CN109338362A (en) * | 2018-10-29 | 2019-02-15 | 河北工业大学 | A method of wear-resistant ceramic layer is prepared in Surface Quenching of High-Phosphorus Cast |
| CN110016708A (en) * | 2019-04-16 | 2019-07-16 | 湖南大学 | Suitable for copper and its micro-arc oxidization surface processing method and product of alloy |
| CN110158134A (en) * | 2019-06-10 | 2019-08-23 | 陕西天元智能再制造股份有限公司 | A kind of workpiece surface processing method that cold spraying is combined with differential arc oxidation |
Non-Patent Citations (7)
| Title |
|---|
| J.L. XU ET AL.: "Alumina coating formed on medical NiTi alloy by micro-arc oxidation", 《MATERIALS LETTERS》 * |
| JUNG-CHOU HUNG ET AL.: "Fabrication of an electrode insulated by using hot dip aluminizing and micro-arc oxidation method for electrochemical microhole machining", 《19TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING》 * |
| 宋巍等: "热浸镀铝/微弧氧化处理20钢工艺方法及性能研究", 《装甲兵工程学院学报》 * |
| 张博等: "铝基板表面微弧氧化膜厚度对其导电导热性的影响", 《表面技术》 * |
| 杨培霞等: "《现代电化学表面处理专论》", 31 October 2016, 哈尔滨工业大学出版社 * |
| 王虹斌等: "《微弧氧化技术及其在海洋环境中的应用》", 30 September 2010, 国防工业出版社 * |
| 解世岳等: "碳钢热浸镀铝及微弧氧化研究", 《轻合金加工技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763898A (en) * | 2020-06-01 | 2020-10-13 | 武汉大学 | Metal surface treatment for electrical insulation equipment for preventing C5F10O gas etching method |
| CN111763898B (en) * | 2020-06-01 | 2021-10-01 | 武汉大学 | Metal surface treatment for electrical insulation equipment for preventing C5F10O gas etching method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110453228A (en) | 2019-11-15 |
| CN110952104B (en) | 2021-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101574861B (en) | Titanium-coated aluminium laminated composite plate and preparation method thereof | |
| CN101845662A (en) | Magnesium alloy surface treating method and magnesium alloy polished by same | |
| JPH03501753A (en) | Electrochemical processing method for articles made of conductive materials | |
| CN110952104B (en) | Method for preparing deep narrow gap consumable electrode gas shielded welding contact tip | |
| JP2937484B2 (en) | Methods and products for plasma enhanced electrochemical surface ceramicization | |
| CN106978614A (en) | A kind of preparation method of the silver-plated contact material of Novel clean graphite | |
| CN107904576B (en) | Preparation method of welding wire for aluminum and aluminum alloy robot with electrochemical plating Zn + Cu/Re composite coating | |
| CN210052874U (en) | Novel anticorrosive copper-aluminum transition head of electrolytic zinc cathode plate and electrolytic zinc anode plate | |
| CN103643269A (en) | Process of ultrasonic wave electroplating of copper foil | |
| US20100126878A1 (en) | Method for Electrolytic Stripping of Spray Metal Coated Substrate | |
| CN114737236A (en) | Preparation method of micro-arc oxidized aluminum alloy | |
| CN113770658A (en) | Production process of cathode plate cross beam for electrolytic zinc | |
| CN211471552U (en) | Coating structure of aluminum alloy die casting | |
| CN105779979A (en) | Aluminum welding wire coppering process | |
| CN113789451A (en) | Preparation method of silver-copper alloy wire | |
| CN112080773A (en) | Electrolyte and aluminum alloy welded joint micro-arc oxidation treatment process | |
| CN105839142B (en) | Aluminum electrolyzing cell used anode steel claw and preparation method thereof | |
| CN111910235A (en) | Composite processing method for local mechanical strengthening and micro-arc oxidation of aluminum alloy surface | |
| CN101633084A (en) | Plating aluminium welding wire for carbon dioxide arc welding and preparation method thereof | |
| CN201586832U (en) | Coated welding wire for carbon dioxide arc welding | |
| CN112226794A (en) | Method for repairing contact surface of joint of electrical equipment | |
| CN111926364B (en) | Preparation method of self-lubricating composite ceramic layer on surface of aluminum alloy | |
| CN205869698U (en) | Electrode suitable for coated steel resistance welds | |
| CN113046811A (en) | Micro-arc oxidation electrolyte, application method thereof and workpiece | |
| CN110026660A (en) | A kind of arcing stud Welding of equivalent magnetic field control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |