CN113373496A - Electrochemical treatment auxiliary electrode and use method - Google Patents
Electrochemical treatment auxiliary electrode and use method Download PDFInfo
- Publication number
- CN113373496A CN113373496A CN202110545682.4A CN202110545682A CN113373496A CN 113373496 A CN113373496 A CN 113373496A CN 202110545682 A CN202110545682 A CN 202110545682A CN 113373496 A CN113373496 A CN 113373496A
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- workpiece
- contact head
- auxiliary electrode
- electric field
- field intensity
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
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- 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
- C25D11/005—Apparatus specially adapted for electrolytic conversion coating
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- 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
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
Abstract
An auxiliary electrode for electrochemical treatment is composed of an insulating sleeve, a conducting wire wrapped in said insulating sleeve, and a contact head with multiple through holes on its front insulating sleeve. The auxiliary anode is close to the surface of the workpiece to improve the current density of a local area, so that the nucleation capability of a coating crystal is improved, the current density required by a deposited coating can be obtained at the bottom of a groove of the workpiece and the inner surfaces of a footing, a hole and a cavity, or the current density of the central part of a larger plane is improved, and the coverage and thickness uniformity of the coating are improved; when the anode is used for anodic oxidation of light alloys such as aluminum and aluminum alloy, the anode is used as an auxiliary cathode and is close to the surface of a workpiece so as to improve the current density of a local low electric field intensity area, thereby improving the capability of forming an oxide film layer and improving the coverage and thickness uniformity of the oxide film layer.
Description
Technical Field
The application relates to a manufacturing technology, in particular to an electrochemical treatment auxiliary electrode and a using method for electrochemical treatment of a workpiece.
Background
Electroplating is a commonly used electrochemical surface treatment method, and the process is an electrochemical process for converting metal ions in a conductive solution into a coating layer by using a workpiece to be plated as a cathode, but the qualified coating layer can not be obtained only by passing current. To obtain a satisfactory coating, the surface to be coated must have a sufficient current density to achieve the crystal nucleation ability of the coating, and the magnitude of the current density depends on the intensity of the electric field on the surface to be coated. During electroplating, only the surface to be plated is provided with proper current density, the qualified plating layer can be obtained, and the plating layer thickness in the low current density area is thinner, and the plating layer thickness in the high current density area is thicker. When the current density in a certain region is lower than a prescribed value, a coating satisfying the quality requirement cannot be deposited.
For a workpiece with a complex structure, during electroplating operation, if the current density of a low electric field strength area such as the bottom of a groove is increased to a value that a coating meeting quality requirements can be deposited, the current density of a high electric field strength area such as a surface with a protruded geometric shape is higher, and the deposited coating can not meet the quality requirements. In order to take the coating quality of the whole workpiece into consideration, most of the electroplating surfaces of the workpiece are generally taken as a focus object to be adjusted, so that the current density value of the workpiece meets the condition of qualified deposition quality requirements, and for the bottom of a groove and the inner surfaces of the workpiece such as a footing, a hole and a cavity, because the electric field intensity is very low or no electric field is distributed, a qualified deposition coating is difficult to obtain or can not be obtained, the coating coverage of the workpiece is incomplete, the uniformity of the coating thickness is poor, and the service life of the workpiece is shortened. The same problem exists for larger plate type workpieces with a central area of coating thickness and for anodized workpieces.
The anodic oxidation is a common electrochemical surface treatment method for light alloys such as aluminum, aluminum alloy and the like, and the process is an electrochemical process of taking a workpiece as an anode and placing the workpiece in a conductive solution to generate an oxide film layer on the surface of the workpiece; the current density depends on the intensity of the electric field on the surface, and when the current density on the local surface of the workpiece is lower than the minimum limit for obtaining an acceptable oxide film layer, the corrosion phenomenon can occur, and the acceptable oxide film layer can not be generated.
At present, the method of adding a fixed tool is generally adopted to solve the problems, namely, a fixed auxiliary anode or cathode is added to an area where a deposition layer is difficult or unavailable, and the fixed auxiliary anode or cathode and a workpiece enter each process solution together. The method not only can sacrifice the quality requirement of a plating layer or an oxide film layer of a tool contact point, but also considers the conductive quantity, the cleaning after each working procedure and the liquidity of the solution so as to realize reasonable conduction, heat transfer and mass transfer, and is extremely inconvenient to use.
Disclosure of Invention
In order to solve the problem that the current density is not easy to balance when irregular parts containing holes or grooves are subjected to electroplating and anodic oxidation in the prior art, the application aims to provide an electrochemical treatment auxiliary electrode and a using method thereof.
The electrochemical treatment auxiliary electrode is characterized by comprising a conductive clamp and a contact head, wherein the contact head comprises a conductive wire and an insulating sleeve, the conductive wire is coated in the insulating sleeve, the tail end of the contact head electrically connects the conductive wire and the conductive clamp through a flexible lead, and the insulating sleeve at the front end of the contact head is provided with a plurality of through holes penetrating through the insulating sleeve.
The conductive wire of the auxiliary electrode is made of electroplating anode material or oxidation cathode material.
The method for enhancing the electric field intensity of local electroplating by using the auxiliary electrode for electrochemical treatment comprises an anode rod, an electroplating solution and a workpiece to be electroplated, and is characterized by comprising the following steps of: 1) the workpiece comprises a region which needs to locally enhance the electric field intensity of the electroplating to meet the requirement of uniform plating; 2) when a workpiece is electroplated, the workpiece is placed in electroplating solution containing an anode rod, the conductive clamp of the auxiliary anode is connected to the anode rod, an operator holds the contact head by hand, and the front end of the contact head is close to the area of the workpiece needing to locally enhance the electric field intensity of electroplating.
The method for enhancing the electric field intensity of the local anodic oxidation by using the electrochemical treatment auxiliary electrode comprises a cathode bar, an oxidizing liquid and a workpiece needing anodic oxidation, and is characterized by comprising the following contents of 1) the workpiece comprises a region needing to enhance the electric field intensity of the local anodic oxidation so as to meet the uniform requirement of an oxide film layer; 2) when the workpiece is anodized, the workpiece is placed in oxidizing liquid containing a cathode bar, the conductive clamp of the auxiliary cathode is connected to the cathode bar, an operator holds the contact head in a hand, and the front end of the contact head is close to the area of the workpiece, where the electric field intensity of the anodic oxidation is needed to be locally enhanced.
The beneficial effect of this application lies in: the auxiliary electrode can effectively improve the local current density and the electric field intensity in the electrochemical treatment environment so as to meet the electrochemical treatment requirement on the hole or groove part of the part; the auxiliary electrode has simple structure, convenient operation and high universality.
The present application is described in further detail below with reference to the accompanying drawings of embodiments.
Drawings
FIG. 1 is a schematic view of an auxiliary electrode structure for electrochemical treatment.
FIG. 2 is a partial structural diagram of the front end of an auxiliary electrode contact head for electrochemical treatment.
FIG. 3 is a schematic view of a method for enhancing the electric field intensity of local plating using an auxiliary electrode for electrochemical treatment.
The numbers in the figure illustrate 1 conductive clip, 2 flexible lead, 3 contact, 4 insulating sleeve, 5 conductive wire, 6 through hole, 7 workpiece, 8 groove, 9 cathode bar, 10 anode bar and 11 electroplating solution.
Detailed Description
Referring to the attached drawings, the electrochemical treatment auxiliary electrode comprises a conductive clamp 1 and a contact head 3, wherein the contact head 3 comprises a conductive wire 5 and an insulating sleeve 4, the conductive wire 5 is covered in the insulating sleeve 4, the tail end of the contact head 3 is used for electrically connecting the conductive wire 5 and the conductive clamp 1 through a flexible lead 2, and the insulating sleeve at the front end of the contact head 3 is provided with a plurality of through holes 6 penetrating through the insulating sleeve. As shown in fig. 1 and 2.
The conductive wire 5 of the auxiliary electrode is an electroplating anode material or an oxidation cathode material, when the auxiliary electrode is used in an electroplating process, the conductive wire 5 of the auxiliary electrode is the electroplating anode material, and when the auxiliary electrode is used in an anodic oxidation process, the conductive wire 5 of the auxiliary electrode is the oxidation cathode material.
The embodiment of fig. 3 provides a method for enhancing the electric field intensity of local electroplating by using the auxiliary electrode for electrochemical treatment. Contain anode bar 10, plating solution 11 and the work piece 7 that needs the electroplating, as shown in fig. 3, work piece 7 is last to have a recess 8, in order to make the cladding material in the recess 8 unanimous with the apparent cladding material of work piece 7, this application increases the current density in the recess 8 through using auxiliary electrode part, when electroplating work piece 7, work piece 7 is arranged in the plating solution that contains anode bar 10, work piece 7 is connected with the cathode bar, connect the conductive clamp 1 of auxiliary anode on anode bar 10, operating personnel holds contact 3 by hand, in the recess 8 that the front end of contact 3 is close to work piece 7, the plating solution passes through the through-hole 6 and the conducting wire intercommunication of contact 3 front end, the local electroplating electric field intensity in the work piece recess has been improved, make the cladding material in the work piece recess 8 meet the demands.
In implementation, the conductive clip 1 can be stably connected with an anode rod of a power supply structure of a process solution tank and provide enough current, the flexible lead 2 is a multi-strand copper core lead or cable with the length of 500mm-2000mm, the insulating layer 4 of the contact 3 is an acid and alkali resistant insulating sleeve, the front end of the insulating layer 4 is provided with a through hole 6, the diameter of the conductive wire 5 is 1-5 mm, the stainless steel wire or titanium alloy wire or other conductive electrode materials, and the through hole 6 at the front end of the insulating layer 4 ensures that the conductive wire is communicated with electroplating solution from multiple directions.
According to the method, for the bottom of the groove of the workpiece and the inner surfaces of the footing, the hole and the cavity, because the electric field intensity is low, the current density required by a deposited coating or an oxide film layer cannot be obtained, when the method is used for electroplating, the auxiliary electrode is used as an auxiliary anode, and the current density of a local area is improved by manually approaching the surface of the workpiece at the initial stage or/and in the process of electroplating operation, so that the crystal nucleation capability of the coating is improved, the current density required by the deposited coating can be obtained at the bottom of the groove of the workpiece and the inner surfaces of the footing, the hole and the cavity, or the current density of the central part of a larger plane is improved, and the coverage and the thickness uniformity of the coating are improved; the auxiliary electrode can also be used for anodic oxidation of light alloys such as aluminum and aluminum alloy, and can be used as an auxiliary cathode, and in the initial oxidation stage or/and process, the auxiliary electrode is manually close to the surface of a workpiece to improve the current density of a local low-electric-field-intensity area, so that the capacity of forming an oxide film layer is improved, and the coverage and thickness uniformity of the oxide film layer are improved. The method can also be used for electropolishing.
Claims (4)
1. The electrochemical treatment auxiliary electrode is characterized by comprising a conductive clamp and a contact head, wherein the contact head comprises a conductive wire and an insulating sleeve, the conductive wire is coated in the insulating sleeve, the tail end of the contact head electrically connects the conductive wire and the conductive clamp through a flexible lead, and the insulating sleeve at the front end of the contact head is provided with a plurality of through holes penetrating through the insulating sleeve.
2. The electrochemical processing auxiliary electrode of claim 1, wherein the conductive filaments of the auxiliary electrode are a plating anode material or an oxidation cathode material.
3. A method for enhancing the electric field intensity of local plating using the auxiliary electrode for electrochemical treatment as defined in claim 1 or 2, comprising an anode rod, a plating solution and a workpiece to be plated, characterized by comprising: 1) the workpiece comprises a region which needs to locally enhance the electric field intensity of the electroplating to meet the requirement of uniform plating; 2) when a workpiece is electroplated, the workpiece is placed in electroplating solution containing an anode rod, the conductive clamp of the auxiliary anode is connected to the anode rod, an operator holds the contact head by hand, and the front end of the contact head is close to the area of the workpiece needing to locally enhance the electric field intensity of electroplating.
4. A method for enhancing the electric field intensity of local anodic oxidation by using the auxiliary electrode for electrochemical treatment as defined in claim 1 or 2, comprising a cathode bar, an oxidizing liquid and a workpiece requiring anodic oxidation, characterized by comprising the following steps of 1) said workpiece comprises a region requiring local enhancement of the electric field intensity of anodic oxidation to satisfy the requirement of uniformity of an oxide film layer; 2) when the workpiece is anodized, the workpiece is placed in oxidizing liquid containing a cathode bar, the conductive clamp of the auxiliary cathode is connected to the cathode bar, an operator holds the contact head in a hand, and the front end of the contact head is close to the area of the workpiece, where the electric field intensity of the anodic oxidation is needed to be locally enhanced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110545682.4A CN113373496A (en) | 2021-05-19 | 2021-05-19 | Electrochemical treatment auxiliary electrode and use method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110545682.4A CN113373496A (en) | 2021-05-19 | 2021-05-19 | Electrochemical treatment auxiliary electrode and use method |
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| CN113373496A true CN113373496A (en) | 2021-09-10 |
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| CN202110545682.4A Pending CN113373496A (en) | 2021-05-19 | 2021-05-19 | Electrochemical treatment auxiliary electrode and use method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032591A (en) * | 2021-12-02 | 2022-02-11 | 中航贵州飞机有限责任公司 | Electroplating tool for wall surface of inner hole of part and using method |
| CN114277392A (en) * | 2021-12-23 | 2022-04-05 | 四川大学华西医院 | Electrolytic device with ion trap, electrolytic method and electroplating method |
| CN114481253A (en) * | 2021-12-20 | 2022-05-13 | 河南平高电气股份有限公司 | Method for improving in-hole anodic oxidation deep plating capacity of porous part |
| CN115369464A (en) * | 2022-08-24 | 2022-11-22 | 合肥微睿光电科技有限公司 | Method for generating oxide film on surface of upper electrode, upper electrode and cathode plate |
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| CN101899697A (en) * | 2010-08-13 | 2010-12-01 | 上海交通大学 | Electroplating equipment for inner wall auxiliary anode of specially-shaped cavity |
| CN102330136A (en) * | 2011-09-06 | 2012-01-25 | 上海瑞尔实业有限公司 | Auxiliary cathode and method for carrying out anodic oxidation on blind hole by using the same |
| CN202465932U (en) * | 2011-12-27 | 2012-10-03 | 中国航空工业第六○七研究所 | Flexible auxiliary anode for electroplating inner cavity of multi-bend waveguide |
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| CN106947996A (en) * | 2017-03-09 | 2017-07-14 | 中国航发北京航空材料研究院 | A kind of Titanium Electroplating cadmium impressed current anode and its application method |
| CN107378155A (en) * | 2017-05-31 | 2017-11-24 | 广东工业大学 | A kind of method for improving stainless steel surfaces electrical-chemistry method hole uniformity |
| CN107447250A (en) * | 2017-08-18 | 2017-12-08 | 中国航发贵州黎阳航空动力有限公司 | A kind of zinc-plated Simple clamp of conduit |
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2021
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040108215A1 (en) * | 2002-12-06 | 2004-06-10 | Com Dev Ltd. | Electroplating anode assembly |
| CN101899697A (en) * | 2010-08-13 | 2010-12-01 | 上海交通大学 | Electroplating equipment for inner wall auxiliary anode of specially-shaped cavity |
| CN102330136A (en) * | 2011-09-06 | 2012-01-25 | 上海瑞尔实业有限公司 | Auxiliary cathode and method for carrying out anodic oxidation on blind hole by using the same |
| CN202465932U (en) * | 2011-12-27 | 2012-10-03 | 中国航空工业第六○七研究所 | Flexible auxiliary anode for electroplating inner cavity of multi-bend waveguide |
| CN202898586U (en) * | 2012-11-28 | 2013-04-24 | 胜华电子（惠阳）有限公司 | Copper plated auxiliary cathode |
| CN104099658A (en) * | 2014-08-04 | 2014-10-15 | 葛婕 | Auxiliary anode for use in acid zinc-nickel alloy electroplating |
| CN106947996A (en) * | 2017-03-09 | 2017-07-14 | 中国航发北京航空材料研究院 | A kind of Titanium Electroplating cadmium impressed current anode and its application method |
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| CN107447250A (en) * | 2017-08-18 | 2017-12-08 | 中国航发贵州黎阳航空动力有限公司 | A kind of zinc-plated Simple clamp of conduit |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032591A (en) * | 2021-12-02 | 2022-02-11 | 中航贵州飞机有限责任公司 | Electroplating tool for wall surface of inner hole of part and using method |
| CN114481253A (en) * | 2021-12-20 | 2022-05-13 | 河南平高电气股份有限公司 | Method for improving in-hole anodic oxidation deep plating capacity of porous part |
| CN114481253B (en) * | 2021-12-20 | 2024-03-29 | 河南平高电气股份有限公司 | Method for improving anodic oxidation deep plating capacity in holes of porous parts |
| CN114277392A (en) * | 2021-12-23 | 2022-04-05 | 四川大学华西医院 | Electrolytic device with ion trap, electrolytic method and electroplating method |
| CN114277392B (en) * | 2021-12-23 | 2023-10-24 | 四川大学华西医院 | Electrolysis device with ion trap, electrolysis method and electroplating method |
| CN115369464A (en) * | 2022-08-24 | 2022-11-22 | 合肥微睿光电科技有限公司 | Method for generating oxide film on surface of upper electrode, upper electrode and cathode plate |
| CN115369464B (en) * | 2022-08-24 | 2023-07-18 | 合肥微睿光电科技有限公司 | Method for generating oxide film on surface of upper electrode, upper electrode and cathode plate |
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