CN110656359A - Production method of high-frequency high-speed electrolytic copper foil - Google Patents
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/04—Wires; Strips; Foils
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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
- C25D1/00—Electroforming
- C25D1/20—Separation of the formed objects from the electrodes with no destruction of said electrodes
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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
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/10—Agitating of electrolytes; Moving of racks
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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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
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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
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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Abstract
The invention relates to a preparation method of an electrolytic copper foil. A production method of high-frequency high-speed electrolytic copper foil is characterized by comprising the following steps: 1) preparing electrolytic copper foil by adopting a direct current deposition process: preparing an electrolyte; secondly, adding allyl thiourea, citric acid and hydrochloric acid into the electrolyte to obtain a composite electrolyte; thirdly, electrodeposition; 2) and (3) second electroplating treatment: preparing a second composite electrolyte: the copper sulfate content is 80-90 g/L, the sulfuric acid content is 80-95 g/L, the concentration of carboxymethyl cellulose is 2-5 mg/L, the concentration of polyoxyethylene alkyl ether is 2-5 mg/L, the concentration of polyethylene glycol is 0.5-1 mg/L, and the concentration of allylthiourea is 0.5-0.8 mg/L; the rough surface of the electrolytic copper foil is positioned outside the cathode roller, and the electrolytic copper foil runs in a second electrolytic tank at the speed of 20-25 m/min to obtain the electrolytic copper foil with the surface treated; 3) and (4) performing strengthening treatment to obtain the high-frequency high-speed electrolytic copper foil. The electrolytic copper foil obtained by the method has the characteristics of smooth surface, good flexibility and high tensile strength.
Description
Technical Field
The invention relates to a preparation method of an electrolytic copper foil, in particular to a production method of a high-frequency high-speed electrolytic copper foil.
Background
Copper foil is a key material of a printed circuit board which plays a role in supporting and interconnecting components in electronic products, and is like a neural network for signal and power transmission of the electronic products. Since the last 90 s, the development of IT product technology has promoted the development of printed circuit boards towards multilayering, thinning, high-density and high-speed, and has made higher demands on the performance, quality and reliability of the electrolytic copper foil, and has greatly pushed the development of electrolytic copper foil manufacturing technology.
The preparation method of the prior electrolytic copper foil comprises the following steps: an aqueous solution of sulfuric acid and copper sulfate was used as an electrolytic solution, and this electrolytic solution was filled between a cylindrical titanium drum as a cathode and an insoluble anode as an anode, and a direct current was passed between the two electrodes to deposit copper on the surface of the cathode. At this time, the cathode drum is rotated at a constant speed, and the deposited electrolytic copper is peeled off from the drum surface and continuously wound up. Further, the surface of the peeled copper foil in contact with the roll is referred to as "glossy surface", the surface opposite to the glossy surface is referred to as "rough surface", and the electrolytic copper foil is referred to as "untreated electrolytic copper foil" by those skilled in the art.
Disclosure of Invention
The invention aims to provide a production method of a high-frequency high-speed electrolytic copper foil, and the electrolytic copper foil obtained by the method has the characteristics of smooth surface and good flexibility.
In order to achieve the purpose, the invention adopts the technical scheme that: a production method of high-frequency high-speed electrolytic copper foil is characterized by comprising the following steps:
1) preparing electrolytic copper foil by adopting a direct current deposition process: preparing an electrolyte: preparing an electrolyte with the copper sulfate content of 280-300 g/L and the sulfuric acid content of 100-115 g/L;
adding allyl thiourea, citric acid and hydrochloric acid into the electrolyte to obtain a first composite electrolyte; in the first composite electrolyte, the concentration of citric acid is 10-15 mg/L, the concentration of hydrochloric acid is 15-19 mg/L, and the concentration of allylthiourea is 0.5-0.8 mg/L;
③ electrodeposition: adjusting the temperature of the first composite electrolyte to 41-49 ℃, and stirring the first composite electrolyteStirring the solution (by a stirrer), and placing the solution in a first electrolytic tank (the first electrolytic tank is filled with a first composite electrolyte) by using a high-frequency pulse power supply at a current density of 50-60A/dm2Carrying out electrodeposition on copper ions in the first composite electrolyte between the cathode plate and the anode plate, controlling the rotating speed of a cathode roller to be 7-8 m/min, controlling the frequency of a high-frequency pulse power supply to be 70-80 Hz (adopting a duty ratio of 0.8-0.85), and preparing an electrolytic copper foil on the cathode; stripping the generated electrolytic copper foil from the cathode roller and then feeding the electrolytic copper foil into a second electrolytic tank;
2) and (3) second electroplating treatment: preparing a second composite electrolyte: the copper sulfate content is 80-90 g/L, the sulfuric acid content is 80-95 g/L, the concentration of carboxymethyl cellulose is 2-5 mg/L, the concentration of polyoxyethylene alkyl ether is 2-5 mg/L, the concentration of polyethylene glycol is 0.5-1 mg/L, and the concentration of allylthiourea is 0.5-0.8 mg/L;
the second composite electrolyte is positioned in the second electrolytic tank, and is stirred, the temperature of the second composite electrolyte is 40-49 ℃, and the current density is 40-45A/dm2(4000～4500A/m2) (ii) a The rough surface of the electrolytic copper foil is positioned at the outer side of the cathode roller (the 'glossy surface' is in contact with the cathode roller), and the electrolytic copper foil runs in a second electrolytic tank at the speed of 20-25 m/min to obtain the electrolytic copper foil with the surface treated;
3) enhancement treatment: heating the surface-treated electrolytic copper foil at 180-190 ℃ for 0.8-0.9 hours to obtain an electrolytic copper foil (high-frequency high-speed electrolytic copper foil).
According to the technical scheme, the second composite electrolyte further comprises titanium sulfate and hydrochloric acid, and in the second composite electrolyte: the concentration of the titanium sulfate is 2-5 mg/L, and the concentration of the hydrochloric acid is 14-16 mg/L.
The invention has the beneficial effects that: 1) and (3) rotating the high-frequency pulse power supply and the cathode roller at a high speed (the rotating speed is 7-8 m/min) to obtain the ultrathin electrolytic copper foil.
2) Adding citric acid and hydrochloric acid into electrolyte, wherein the roughness of a rough surface is less than 1.2 mu m (step 1); the normal temperature elongation is 19-22% (the copper foil product has high flexibility and bending resistance);
3) after the second electroplating treatment (the raw materials and the mutual proportion in the second composite electrolyte play a key role), the roughness of the rough surface is less than 0.8 mu m.
4) The stirring is adopted, so that the dispersing capacity of the electrolyte is obviously improved under the stirring action, the uniformity of copper ion distribution is improved, the diffusion layer on the surface of the electrode is thinned, the limiting current density is increased, the deposition efficiency is improved, and the mass transfer near the electrode is promoted, so that the surface of a deposition layer is more smooth and delicate.
5) The normal temperature tensile strength is 870-950MPa after heating at 180-190 ℃ for 0.8-0.9 h.
Detailed Description
The following examples are intended to further illustrate the invention, but are not intended to limit the invention.
Example 1
A production method of high-frequency high-speed electrolytic copper foil comprises the following steps:
1) preparing electrolytic copper foil by adopting a direct current deposition process: preparing an electrolyte: preparing electrolyte with copper sulfate content of 280g/L and sulfuric acid content of 100 g/L;
adding allyl thiourea, citric acid and hydrochloric acid into the electrolyte to obtain a first composite electrolyte; in the first composite electrolyte, the concentration of citric acid is 10mg/L, the concentration of hydrochloric acid is 15mg/L, and the concentration of allylthiourea is 0.5 mg/L;
③ electrodeposition: adjusting the temperature of the first composite electrolyte to 41 ℃, stirring the first composite electrolyte (by adopting a stirrer), and using a high-frequency pulse power supply in a first electrolytic tank (the first composite electrolyte is filled in the first electrolytic tank) to ensure that the current density is 50A/dm2Carrying out electrodeposition on copper ions in the first composite electrolyte between the cathode plate and the anode plate, controlling the rotating speed of a cathode roller to be 7 m/min, controlling the frequency of a high-frequency pulse power supply to be 70Hz, and preparing electrolytic copper foil on the cathode by adopting a duty ratio of 0.8; stripping the generated electrolytic copper foil from the cathode roller and then feeding the electrolytic copper foil into a second electrolytic tank;
2) and (3) second electroplating treatment: preparing a second composite electrolyte: the copper sulfate content is 80g/L, the sulfuric acid content is 80g/L, the concentration of carboxymethyl cellulose is 2mg/L, the concentration of polyoxyethylene alkyl ether is 2mg/L, the concentration of polyethylene glycol is 0.5mg/L, and the concentration of allylthiourea is 0.5 mg/L;
the second composite electrolyte is positioned in the second electrolytic tank, and is stirred, the temperature of the second composite electrolyte is 40 ℃, and the current density is 40A/dm2(4000A/m2) (ii) a The rough surface of the electrolytic copper foil is positioned at the outer side of the cathode roller (the 'glossy surface' is contacted with the cathode roller), and the electrolytic copper foil runs in a second electrolytic tank at the speed of 20m/min to obtain the electrolytic copper foil with the surface treated;
3) enhancement treatment: the electrolytic copper foil having the surface treated was heated at 180 ℃ for 0.8 hour to obtain a desired electrolytic copper foil (high-frequency high-speed electrolytic copper foil).
The electrolytic copper foil has a normal temperature elongation of 19-22%, a roughness of a rough surface of 0.8 μm or less, and a normal temperature tensile strength of 870-950 MPa.
Example 2
A production method of high-frequency high-speed electrolytic copper foil comprises the following steps:
1) preparing electrolytic copper foil by adopting a direct current deposition process: preparing an electrolyte: preparing electrolyte with copper sulfate content of 290g/L and sulfuric acid content of 110 g/L;
adding allyl thiourea, citric acid and hydrochloric acid into the electrolyte to obtain a first composite electrolyte; in the first composite electrolyte, the concentration of citric acid is 12mg/L, the concentration of hydrochloric acid is 17mg/L, and the concentration of allylthiourea is 0.7 mg/L;
③ electrodeposition: adjusting the temperature of the first composite electrolyte to 45 ℃, stirring the first composite electrolyte (adopting a stirrer), and using a high-frequency pulse power supply in a first electrolytic tank (the first composite electrolyte is filled in the first electrolytic tank) to adjust the current density to 55A/dm2Carrying out electrodeposition on copper ions in the first composite electrolyte between the cathode plate and the anode plate, wherein the rotating speed of a cathode roller is 7.5 m/min, the frequency of a high-frequency pulse power supply is controlled to be 75Hz, and an electrolytic copper foil is prepared on the cathode by adopting a duty ratio of 0.82; stripping the generated electrolytic copper foil from the cathode roller and then feeding the electrolytic copper foil into a second electrolytic tank;
2) and (3) second electroplating treatment: preparing a second composite electrolyte: the copper sulfate content is 85g/L, the sulfuric acid content is 90g/L, the concentration of carboxymethyl cellulose is 3mg/L, the concentration of polyoxyethylene alkyl ether is 3mg/L, the concentration of polyethylene glycol is 0.8mg/L, and the concentration of allylthiourea is 0.7 mg/L;
the second composite electrolyte is positioned in the second electrolytic tank, and is stirred, the temperature of the second composite electrolyte is 45 ℃, and the current density is 42A/dm2(ii) a The rough surface of the electrolytic copper foil is positioned at the outer side of the cathode roller (the 'glossy surface' is contacted with the cathode roller), and the electrolytic steel foil runs in a second electrolytic tank at the speed of 22m/min to obtain the electrolytic copper foil with the surface treated;
3) enhancement treatment: the electrolytic copper foil whose surface was treated was heated at 185 ℃ for 0.8 hour to obtain a desired electrolytic copper foil (high-frequency high-speed electrolytic copper foil).
The electrolytic copper foil has a normal temperature elongation of 19-22%, a roughness of a rough surface of 0.8 μm or less, and a normal temperature tensile strength of 870-950 MPa.
Example 3
A production method of high-frequency high-speed electrolytic copper foil comprises the following steps:
1) preparing electrolytic copper foil by adopting a direct current deposition process: preparing an electrolyte: preparing electrolyte with copper sulfate content of 300g/L and sulfuric acid content of 115 g/L;
adding allyl thiourea, citric acid and hydrochloric acid into the electrolyte to obtain a first composite electrolyte; in the first composite electrolyte, the concentration of citric acid is 15mg/L, the concentration of hydrochloric acid is 19mg/L, and the concentration of allylthiourea is 0.8 mg/L;
③ electrodeposition: adjusting the temperature of the first composite electrolyte to 49 ℃, stirring the first composite electrolyte (by adopting a stirrer), and using a high-frequency pulse power supply in a first electrolytic tank (the first composite electrolyte is filled in the first electrolytic tank) to ensure that the current density is 60A/dm2Carrying out electrodeposition on copper ions in the first composite electrolyte between the cathode plate and the anode plate, controlling the rotating speed of a cathode roller to be 8 m/min, controlling the frequency of a high-frequency pulse power supply to be 80Hz, and preparing electrolytic copper foil on the cathode by adopting a duty ratio of 0.85; will regenerateThe electrolytic copper foil is stripped from the cathode roller and then enters a second electrolytic tank;
2) and (3) second electroplating treatment: preparing a second composite electrolyte: the copper sulfate content is 90g/L, the sulfuric acid content is 95g/L, the concentration of carboxymethyl cellulose is 5mg/L, the concentration of polyoxyethylene alkyl ether is 5mg/L, the concentration of polyethylene glycol is 1mg/L, and the concentration of allylthiourea is 0.8 mg/L;
the second composite electrolyte is positioned in the second electrolytic tank, and is stirred, the temperature of the second composite electrolyte is 49 ℃, and the current density is 45A/dm2(ii) a The rough surface of the electrolytic copper foil is positioned at the outer side of the cathode roller (the 'glossy surface' is contacted with the cathode roller), and the electrolytic copper foil runs in a second electrolytic tank at the speed of 25m/min to obtain the electrolytic copper foil with the surface treated;
3) enhancement treatment: the surface-treated electrolytic copper foil was heated at 190 ℃ for 0.9 hour to obtain a desired electrolytic copper foil (high-frequency high-speed electrolytic copper foil).
The electrolytic copper foil has a normal temperature elongation of 19-22%, a roughness of a rough surface of 0.8 μm or less, and a normal temperature tensile strength of 870-950 MPa.
Example 4
A production method of high-frequency high-speed electrolytic copper foil comprises the following steps:
1) preparing electrolytic copper foil by adopting a direct current deposition process: preparing an electrolyte: preparing electrolyte with copper sulfate content of 290g/L and sulfuric acid content of 110 g/L;
adding allyl thiourea, citric acid and hydrochloric acid into the electrolyte to obtain a first composite electrolyte; in the first composite electrolyte, the concentration of citric acid is 12mg/L, the concentration of hydrochloric acid is 17mg/L, and the concentration of allylthiourea is 0.7 mg/L;
③ electrodeposition: adjusting the temperature of the first composite electrolyte to 45 ℃, stirring the first composite electrolyte (adopting a stirrer), and using a high-frequency pulse power supply in a first electrolytic tank (the first composite electrolyte is filled in the first electrolytic tank) to adjust the current density to 55A/dm2The copper ions in the first composite electrolyte between the cathode plate and the anode plate are electrodeposited, and the rotating speed of the cathode roller is 7.5 m/minControlling the frequency of a high-frequency pulse power supply to be 75Hz, and preparing electrolytic copper foil on a cathode by adopting a duty ratio of 0.82; stripping the generated electrolytic copper foil from the cathode roller and then feeding the electrolytic copper foil into a second electrolytic tank;
2) and (3) second electroplating treatment: preparing a second composite electrolyte: the copper sulfate content is 85g/L, the sulfuric acid content is 90g/L, the concentration of carboxymethyl cellulose is 3mg/L, the concentration of polyoxyethylene alkyl ether is 3mg/L, the concentration of polyethylene glycol is 0.8mg/L, the concentration of allylthiourea is 0.7mg/L, the concentration of titanium sulfate is 4mg/L, and the concentration of hydrochloric acid is 15 mg/L;
the second composite electrolyte is positioned in the second electrolytic tank, and is stirred, the temperature of the second composite electrolyte is 45 ℃, and the current density is 42A/dm2(ii) a The rough surface of the electrolytic copper foil is positioned at the outer side of the cathode roller (the 'glossy surface' is contacted with the cathode roller), and the electrolytic copper foil runs in a second electrolytic tank at the speed of 22m/min to obtain the electrolytic copper foil with the surface treated;
3) enhancement treatment: the electrolytic copper foil whose surface was treated was heated at 185 ℃ for 0.8 hour to obtain a desired electrolytic copper foil (high-frequency high-speed electrolytic copper foil).
The electrolytic copper foil has a normal temperature elongation of 21-22%, a roughness of a rough surface of 0.3 μm or less, and a normal temperature tensile strength of 920-.
Example 5
A production method of high-frequency high-speed electrolytic copper foil comprises the following steps:
1) preparing electrolytic copper foil by adopting a direct current deposition process: preparing an electrolyte: preparing electrolyte with copper sulfate content of 290g/L and sulfuric acid content of 110 g/L;
adding allyl thiourea, citric acid and hydrochloric acid into the electrolyte to obtain a first composite electrolyte; in the first composite electrolyte, the concentration of citric acid is 12mg/L, the concentration of hydrochloric acid is 17mg/L, and the concentration of allylthiourea is 0.7 mg/L;
③ electrodeposition: adjusting the temperature of the first composite electrolyte to 45 ℃, stirring the first composite electrolyte (by adopting a stirrer), and using the first composite electrolyte in the first electrolytic tank (the first composite electrolyte is filled in the first electrolytic tank)The frequency pulse power supply has a current density of 55A/dm2Carrying out electrodeposition on copper ions in the first composite electrolyte between the cathode plate and the anode plate, wherein the rotating speed of a cathode roller is 7.5 m/min, the frequency of a high-frequency pulse power supply is controlled to be 75Hz, and an electrolytic copper foil is prepared on the cathode by adopting a duty ratio of 0.82; stripping the generated electrolytic copper foil from the cathode roller and then feeding the electrolytic copper foil into a second electrolytic tank;
2) and (3) second electroplating treatment: preparing a second composite electrolyte: the copper sulfate content is 85g/L, the sulfuric acid content is 90g/L, the concentration of carboxymethyl cellulose is 3mg/L, the concentration of polyoxyethylene alkyl ether is 3mg/L, the concentration of polyethylene glycol is 0.8mg/L, the concentration of allylthiourea is 0.7mg/L, the concentration of titanium sulfate is 5mg/L, and the concentration of hydrochloric acid is 16 mg/L;
the second composite electrolyte is positioned in the second electrolytic tank, and is stirred, the temperature of the second composite electrolyte is 45 ℃, and the current density is 42A/dm2(ii) a The rough surface of the electrolytic copper foil is positioned at the outer side of the cathode roller (the 'glossy surface' is contacted with the cathode roller), and the electrolytic copper foil runs in a second electrolytic tank at the speed of 22m/min to obtain the electrolytic copper foil with the surface treated;
3) enhancement treatment: the electrolytic copper foil whose surface was treated was heated at 185 ℃ for 0.8 hour to obtain a desired electrolytic copper foil (high-frequency high-speed electrolytic copper foil).
The electrolytic copper foil has a normal temperature elongation of 21-22%, a roughness of a rough surface of 0.3 μm or less, and a normal temperature tensile strength of 920-.
The raw materials listed in the invention, the upper and lower limits and interval values of the raw materials of the invention, and the upper and lower limits and interval values of the process parameters (such as temperature, time and the like) can all realize the invention, and the examples are not listed.
Claims (3)
1. A production method of high-frequency high-speed electrolytic copper foil is characterized by comprising the following steps:
1) preparing electrolytic copper foil by adopting a direct current deposition process: preparing an electrolyte: preparing an electrolyte with the copper sulfate content of 280-300 g/L and the sulfuric acid content of 100-115 g/L;
adding allyl thiourea, citric acid and hydrochloric acid into the electrolyte to obtain a first composite electrolyte; in the first composite electrolyte, the concentration of citric acid is 10-15 mg/L, the concentration of hydrochloric acid is 15-19 mg/L, and the concentration of allylthiourea is 0.5-0.8 mg/L;
③ electrodeposition: adjusting the temperature of the first composite electrolyte to 41-49 ℃, stirring the first composite electrolyte (stirring by adopting a stirrer), and using a high-frequency pulse power supply in a first electrolytic tank at the current density of 50-60A/dm2Carrying out electrodeposition on copper ions in the first composite electrolyte between the cathode plate and the anode plate, controlling the rotating speed of a cathode roller to be 7-8 m/min, controlling the frequency of a high-frequency pulse power supply to be 70-80 Hz, and preparing an electrolytic copper foil on the cathode; stripping the generated electrolytic copper foil from the cathode roller and then feeding the electrolytic copper foil into a second electrolytic tank;
2) and (3) second electroplating treatment: preparing a second composite electrolyte: the copper sulfate content is 80-90 g/L, the sulfuric acid content is 80-95 g/L, the concentration of carboxymethyl cellulose is 2-5 mg/L, the concentration of polyoxyethylene alkyl ether is 2-5 mg/L, the concentration of polyethylene glycol is 0.5-1 mg/L, and the concentration of allylthiourea is 0.5-0.8 mg/L;
the second composite electrolyte is positioned in the second electrolytic tank, and is stirred, the temperature of the second composite electrolyte is 40-49 ℃, and the current density is 40-45A/dm2(ii) a The rough surface of the electrolytic copper foil is positioned outside the cathode roller, and the electrolytic copper foil runs in a second electrolytic tank at the speed of 20-25 m/min to obtain the electrolytic copper foil with the surface treated;
3) enhancement treatment: and heating the electrolytic copper foil with the surface treated at 180-190 ℃ for 0.8-0.9 h to obtain the high-frequency high-speed electrolytic copper foil.
2. The method for producing a high-frequency high-speed electrolytic copper foil according to claim 1, characterized in that: the second composite electrolyte also comprises titanium sulfate and hydrochloric acid, and in the second composite electrolyte: the concentration of the titanium sulfate is 2-5 mg/L, and the concentration of the hydrochloric acid is 14-16 mg/L.
3. The method for producing a high-frequency high-speed electrolytic copper foil according to claim 1, characterized in that: the electrodeposition in the step 1) adopts a duty ratio of 0.8-0.85.
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|---|---|---|---|---|
| CN114875457A (en) * | 2022-04-13 | 2022-08-09 | 广东腐蚀科学与技术创新研究院 | Copper foil and preparation method and application thereof |
| CN114875457B (en) * | 2022-04-13 | 2023-10-03 | 广东腐蚀科学与技术创新研究院 | Copper foil and preparation method and application thereof |
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Application publication date: 20200107 |