CN112267123A - Method for cleaning residual ash on surface of copper alloy plate strip for preparing lead frame - Google Patents
Method for cleaning residual ash on surface of copper alloy plate strip for preparing lead frame Download PDFInfo
- Publication number
- CN112267123A CN112267123A CN202010932518.4A CN202010932518A CN112267123A CN 112267123 A CN112267123 A CN 112267123A CN 202010932518 A CN202010932518 A CN 202010932518A CN 112267123 A CN112267123 A CN 112267123A
- Authority
- CN
- China
- Prior art keywords
- copper alloy
- alloy plate
- cleaning
- degreasing
- plate strip
- 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.)
- Pending
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 70
- 229910000881 Cu alloy Inorganic materials 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005238 degreasing Methods 0.000 claims abstract description 64
- 238000005498 polishing Methods 0.000 claims abstract description 55
- 238000005406 washing Methods 0.000 claims abstract description 50
- 238000005554 pickling Methods 0.000 claims abstract description 42
- 238000002161 passivation Methods 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 11
- 230000003749 cleanliness Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 239000000047 product Substances 0.000 claims description 23
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- 238000005097 cold rolling Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000000137 annealing Methods 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 238000005237 degreasing agent Methods 0.000 claims description 9
- 239000013527 degreasing agent Substances 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000011265 semifinished product Substances 0.000 claims description 6
- 238000009966 trimming Methods 0.000 claims description 6
- 244000185238 Lophostemon confertus Species 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 239000003112 inhibitor Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 239000004745 nonwoven fabric Substances 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000009713 electroplating Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/103—Other heavy metals copper or alloys of copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/005—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents using brushes
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to a method for cleaning residual ash on the surface of a copper alloy plate strip for preparing a lead frame, belongs to the technical field of nonferrous metal copper alloy plate strip processing, solves the technical problem of cleaning residual ash on the surface of a lead frame material C19400 product, and comprises the following steps: selecting the types of a degreasing brush, a pre-polishing brush and a polishing brush and adjusting the installation positions of the degreasing brush, the pre-polishing brush and the polishing brush; preparing and debugging degreasing solution, pickling solution and passivation solution; the rolled copper alloy plate strip product is sequentially subjected to the following processes: degreasing → primary washing → secondary washing → acid washing → tertiary washing → polishing → four washing → passivation → drying, and finishing the cleaning of the residual ash on the surface of the copper alloy plate strip. The method can obviously improve the residual ash on the surface of the C19400 copper alloy plate strip, obviously improve the surface cleanliness, effectively inhibit the generation of white point trailing defects, and does not influence the subsequent electroplating process.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal copper alloy plate and strip processing, relates to improvement of surface cleanliness of copper alloy plate and strip products, and particularly relates to a method for cleaning residual ash on the surface of a copper alloy plate and strip for preparing a lead frame.
Background
The copper alloy is widely applied to the fields of national defense industry, aerospace, aviation, electronics, electric power and the like, and along with the rapid development of the copper alloy processing industry, the surface quality of copper alloy plates and strips requires brightness, cleanness, flatness, no pollution and corrosion resistance so as to meet the process requirements of secondary processing such as subsequent electroplating, stamping and the like on the surface of a copper strip.
The surface quality control of the copper alloy plate strip relates to each production link in the whole production process flow, wherein the cleaning of the middle and finished products of the strip is an important process for improving the surface quality of the strip.
The processing flow of the copper alloy plate strip product for preparing the lead frame generally comprises the following steps: smelting → casting → heating in a stepping furnace → hot rolling → milling face → one time of cold rolling → trimming → annealing → cleaning of semi-finished product → secondary cold rolling → annealing → cleaning of pre-finished product → third cold rolling → cleaning of finished product → pulling and straightening → slitting → packaging.
The surface quality requirement of the C19400 product strip applied to the lead frame material is very high, and cross striations or printing is easily caused by abrasive brushing, so the method of adopting the abrasive brushing in the copper strip cleaning process is not applicable any more. The change of the process brings new problems, and the cleaning process without the grinding brush causes that the residual ash on the surface of the copper strip can not be well removed, thereby influencing the subsequent strip dividing process. The residual ash on the surface of the strip is more, so that the residual ash under a press plate of the splitting machine is accumulated, and the residual ash accumulation seriously forms a white point tail on the surface of a product and even causes new scratches on the surface of the strip.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the technical problem of cleaning the residual ash on the surface of the lead frame material C19400 product, the method for cleaning the residual ash on the surface of the copper alloy plate strip for preparing the lead frame is provided under the condition of not influencing the subsequent electroplating process and the use of downstream customers, and the surface cleanliness of the copper alloy plate strip is improved.
The invention is realized by the following technical scheme.
A method for cleaning residual ash on the surface of a copper alloy plate strip for preparing a lead frame comprises the following steps: smelting → casting → heating in a stepping furnace → hot rolling → milling face → one time of cold rolling → trimming → annealing → cleaning of semi-finished product → secondary cold rolling → annealing → cleaning of preform → three times of cold rolling → cleaning of finished product → pulling and straightening → slitting → packaging, the cleaning of finished product comprises the following steps:
s1, selecting the types of the degreasing brush, the pre-polishing brush and the fine polishing brush: the degreasing brush and the pre-polishing brush are both nylon brushes, the fine polishing brush is a non-woven fabric brush, the degreasing brush is arranged in a cleaning box for containing degreasing fluid, and the pre-polishing brush and the fine polishing brush are sequentially arranged in a brush box for polishing on a machine array according to the cleaning sequence;
s2, adjusting the pressing positions of the degreasing brush, the pre-polishing brush and the fine polishing brush to ensure that the bristles are fully contacted with the surface of the copper alloy plate strip as far as possible under the condition that obvious brush lines do not appear on the surface of the copper alloy plate strip;
s3, preparation and debugging of degreasing solution, pickling solution and passivation solution:
firstly, preparing a degreasing solution: heating deionized water to 50-65 ℃, and then adding a degreasing agent into the deionized water to prepare a degreasing solution with the concentration of 0.8-1.2%; the temperature is matched with the concentration, and the residual rolling liquid and the attached organic matters on the surface of the strip are thoroughly removed;
preparing a passivation solution: heating deionized water to 75-85 deg.C, adding passivator into deionized water to obtain 0.15-0.2% passivator solution; the temperature and the concentration of the alloy are matched, the corrosion resistance of the strip is improved, and the discoloration is prevented;
preparing pickling solution: the concentration of the pickling solution is 14-18%; fully removing oxides on the surface of the strip;
s4, debugging of degreasing solution, pickling solution and passivation solution: respectively circulating the prepared degreasing solution, pickling solution and passivation solution in corresponding cleaning tanks for 30-40min to uniformly mix the effective components in the degreasing solution, pickling solution and passivation solution;
s5, sequentially carrying out the following steps on the rolled copper alloy plate strip product: degreasing → primary washing → secondary washing → acid washing → tertiary washing → polishing → four washing → passivation → drying, and finishing the cleaning of the residual ash on the surface of the copper alloy plate strip; wherein the temperature of the first water washing is room temperature, the temperature of the second water washing is 50-60 ℃, the temperature of the third water washing is room temperature, and the temperature of the fourth water washing is 50-60 ℃.
Further, the grade of the copper alloy plate strip is C19400.
Further, the degreasing agent is a neutral water-based degreasing agent, the passivating agent is a compound corrosion inhibitor mainly based on B.T.A, and the acid added in the pickling solution is pure sulfuric acid
Further, after the residual ash on the surface of the copper alloy plate strip is cleaned in the step S5, the surface cleanliness of the copper alloy plate strip is first grade.
Further, the pickling solution is replaced every half year.
Furthermore, two layers of filter screens are arranged in an inlet pipeline of the cleaning tank containing the pickling solution, the distance between the filter screens is 50cm, and the material of the filter screens has high precision and acid resistance.
Furthermore, the material of filter screen is the stainless steel net, and the filter fineness of filter screen is 15 mu m.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for cleaning the residual ash on the surface of the copper alloy plate strip for preparing the lead frame, provided by the invention, the residual ash on the surface of the C19400 copper alloy plate strip is obviously improved, the surface cleanliness is obviously improved, the generation of white point trailing defects is effectively inhibited, and the subsequent electroplating process is not influenced.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the examples follow conventional experimental conditions. In addition, it will be apparent to those skilled in the art that various modifications or improvements can be made to the material components and amounts in these embodiments without departing from the spirit and scope of the invention as defined in the appended claims.
Example one
In the first embodiment, the copper alloy plate strip is of the grade C19400, and a method for cleaning residual ash on the surface of the copper alloy plate strip for manufacturing a lead frame comprises the following steps: smelting → casting → heating in a stepping furnace → hot rolling → milling face → one time of cold rolling → trimming → annealing → cleaning of semi-finished product → secondary cold rolling → annealing → cleaning of preform → three times of cold rolling → cleaning of finished product → pulling and straightening → slitting → packaging, the cleaning of finished product comprises the following steps:
s1, selecting the types of the degreasing brush, the pre-polishing brush and the polishing brush: the degreasing brush and the pre-polishing brush are both nylon brushes, the fine polishing brush is a non-woven fabric brush, the degreasing brush is arranged in a cleaning box for containing degreasing fluid, and the pre-polishing brush and the fine polishing brush are sequentially arranged in a brush box for polishing on a machine array according to the cleaning sequence;
s2, adjusting the pressing positions of the degreasing brush, the pre-polishing brush and the fine polishing brush to ensure that the bristles are fully contacted with the surface of the copper alloy plate strip as far as possible under the condition that obvious brush lines do not appear on the surface of the copper alloy plate strip;
s3, preparation and debugging of degreasing solution, pickling solution and passivation solution:
firstly, preparing a degreasing solution: heating deionized water to 50 ℃, and then adding a neutral water-based degreasing agent into the deionized water to prepare degreasing liquid with the concentration of 0.8%;
preparing a passivation solution: heating deionized water to 75 ℃, and then adding a compound corrosion inhibitor mainly containing B.T.A into the deionized water to prepare a passivation solution with the concentration of 0.15%;
preparing pickling solution: the effective component of the pickling solution is sulfuric acid, and the concentration of the effective component in the pickling solution is 14%;
s4, debugging of degreasing solution, pickling solution and passivation solution: respectively circulating the prepared degreasing solution, pickling solution and passivation solution in corresponding cleaning tanks for 30min to uniformly mix the effective components in the degreasing solution, pickling solution and passivation solution;
s5, sequentially carrying out the following steps on the rolled copper alloy plate strip product: degreasing → primary washing → secondary washing → acid washing → tertiary washing → polishing → fourth washing → passivation → drying, and finishing the cleaning of the residual ash on the surface of the copper alloy plate strip, wherein the surface cleanliness of the cleaned copper alloy plate strip is first grade; wherein the temperature of the first water washing is room temperature, the temperature of the second water washing is 50 ℃, the temperature of the third water washing is room temperature, and the temperature of the fourth water washing is 50 ℃.
The following two items also need to be noted during the cleaning process:
1. the pickling solution is replaced every half year;
2. two layers of filter screens are arranged in an inlet pipeline of a cleaning tank for containing pickling solution, the distance between the filter screens is 50cm, the filter screens are made of stainless steel meshes and have high precision and acid resistance, and the filtering precision of the filter screens is 15 mu m.
Example two
In the second embodiment, the copper alloy plate strip is of the grade C19400, and a method for cleaning residual ash on the surface of the copper alloy plate strip for manufacturing a lead frame comprises the following steps: smelting → casting → heating in a stepping furnace → hot rolling → milling face → one time of cold rolling → trimming → annealing → cleaning of semi-finished product → secondary cold rolling → annealing → cleaning of preform → three times of cold rolling → cleaning of finished product → pulling and straightening → slitting → packaging, the cleaning of finished product comprises the following steps:
s1, selecting the types of the degreasing brush, the pre-polishing brush and the polishing brush: the degreasing brush and the pre-polishing brush are both nylon brushes, the fine polishing brush is a non-woven fabric brush, the degreasing brush is arranged in a cleaning box for containing degreasing fluid, and the pre-polishing brush and the fine polishing brush are sequentially arranged in a brush box for polishing on a machine line according to the cleaning sequence;
s2, adjusting the pressing positions of the degreasing brush, the pre-polishing brush and the fine polishing brush to ensure that the bristles are fully contacted with the surface of the copper alloy plate strip as far as possible under the condition that obvious brush lines do not appear on the surface of the copper alloy plate strip;
s3, preparation and debugging of degreasing solution, pickling solution and passivation solution:
firstly, preparing a degreasing solution: heating deionized water to 60 ℃, and then adding a neutral water-based degreasing agent into the deionized water to prepare degreasing liquid with the concentration of 1.0%;
preparing a passivation solution: heating deionized water to 80 ℃, and then adding a compound corrosion inhibitor mainly containing B.T.A into the deionized water to prepare a passivation solution with the concentration of 0.18%;
preparing pickling solution: the effective component of the pickling solution is sulfuric acid, and the concentration of the effective component in the pickling solution is 16%;
s4, debugging of degreasing solution, pickling solution and passivation solution: circulating the prepared degreasing solution, pickling solution and passivation solution in corresponding cleaning tanks for 35min respectively to uniformly mix the effective components in the degreasing solution, pickling solution and passivation solution;
s5, sequentially carrying out the following steps on the rolled copper alloy plate strip product: degreasing → primary washing → secondary washing → acid washing → tertiary washing → polishing → fourth washing → passivation → drying, and finishing the cleaning of the residual ash on the surface of the copper alloy plate strip, wherein the surface cleanliness of the cleaned copper alloy plate strip is first grade; wherein the temperature of the first water washing is room temperature, the temperature of the second water washing is 55 ℃, the temperature of the third water washing is room temperature, and the temperature of the fourth water washing is 55 ℃.
EXAMPLE III
In the third embodiment, the copper alloy plate strip is of the grade C19400, and a method for cleaning residual ash on the surface of the copper alloy plate strip for manufacturing a lead frame comprises the following steps: smelting → casting → heating in a stepping furnace → hot rolling → milling face → one time of cold rolling → trimming → annealing → cleaning of semi-finished product → secondary cold rolling → annealing → cleaning of preform → three times of cold rolling → cleaning of finished product → pulling and straightening → slitting → packaging, the cleaning of finished product comprises the following steps:
s1, selecting the types of the degreasing brush, the pre-polishing brush and the polishing brush: the degreasing brush and the pre-polishing brush are both nylon brushes, the fine polishing brush is a non-woven fabric brush, the degreasing brush is arranged in a cleaning box for containing degreasing fluid, and the pre-polishing brush and the fine polishing brush are sequentially arranged in a brush box for polishing on a machine line according to the cleaning sequence; s2, adjusting the pressing positions of the degreasing brush, the pre-polishing brush and the fine polishing brush to ensure that the bristles are fully contacted with the surface of the copper alloy plate strip as far as possible under the condition that obvious brush lines do not appear on the surface of the copper alloy plate strip;
s3, preparation and debugging of degreasing solution, pickling solution and passivation solution:
firstly, preparing a degreasing solution: heating deionized water to 65 ℃, and then adding a neutral water-based degreasing agent into the deionized water to prepare degreasing liquid with the concentration of 1.2%;
preparing a passivation solution: heating deionized water to 85 ℃, and then adding a compound corrosion inhibitor mainly containing B.T.A into the deionized water to prepare a passivation solution with the concentration of 0.20%;
preparing pickling solution: the effective component of the pickling solution is sulfuric acid, and the concentration of the effective component in the pickling solution is 18 percent;
s4, debugging of degreasing solution, pickling solution and passivation solution: respectively circulating the prepared degreasing solution, pickling solution and passivation solution in corresponding cleaning tanks for 40min to uniformly mix the effective components in the degreasing solution, pickling solution and passivation solution;
s5, sequentially carrying out the following steps on the rolled copper alloy plate strip product: degreasing → primary washing → secondary washing → acid washing → tertiary washing → polishing → fourth washing → passivation → drying, and finishing the cleaning of the residual ash on the surface of the copper alloy plate strip, wherein the surface cleanliness of the cleaned copper alloy plate strip is first grade; wherein the temperature of the first water washing is room temperature, the temperature of the second water washing is 60 ℃, the temperature of the third water washing is room temperature, and the temperature of the fourth water washing is 60 ℃.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A method for cleaning residual ash on the surface of a copper alloy plate strip for preparing a lead frame comprises the following steps: smelting → casting → heating in a stepping furnace → hot rolling → milling face → one time of cold rolling → trimming → annealing → cleaning of semi-finished product → secondary cold rolling → annealing → cleaning of preform → third cold rolling → cleaning of finished product → pulling and straightening → slitting → packaging, characterized in that: the finished product cleaning process comprises the following steps:
s1, selecting the types of the degreasing brush, the pre-polishing brush and the fine polishing brush: the degreasing brush and the pre-polishing brush are both nylon brushes, the fine polishing brush is a non-woven fabric brush, the degreasing brush is arranged in a cleaning box for containing degreasing fluid, and the pre-polishing brush and the fine polishing brush are sequentially arranged in a brush box for polishing on a machine array according to the cleaning sequence;
s2, adjusting the pressing positions of the degreasing brush, the pre-polishing brush and the fine polishing brush to ensure that the bristles are fully contacted with the surface of the copper alloy plate strip as far as possible under the condition that obvious brush lines do not appear on the surface of the copper alloy plate strip;
s3, preparation of degreasing solution, pickling solution and passivation solution:
firstly, preparing a degreasing solution: heating deionized water to 50-65 ℃, and then adding a degreasing agent into the deionized water to prepare a degreasing solution with the concentration of 0.8-1.2%;
preparing a passivation solution: heating deionized water to 75-85 deg.C, adding passivator into deionized water to obtain 0.15-0.2% passivator solution;
preparing pickling solution: the concentration of the pickling solution is 14-18%;
s4, debugging of degreasing solution, pickling solution and passivation solution: respectively circulating the prepared degreasing solution, pickling solution and passivation solution in corresponding cleaning tanks for 30-40min to uniformly mix the effective components in the degreasing solution, pickling solution and passivation solution;
s5, sequentially carrying out the following steps on the rolled copper alloy plate strip product: degreasing → primary washing → secondary washing → acid washing → tertiary washing → polishing → four washing → passivation → drying, and finishing the cleaning of the residual ash on the surface of the copper alloy plate strip; wherein the temperature of the first water washing is room temperature, the temperature of the second water washing is 50-60 ℃, the temperature of the third water washing is room temperature, and the temperature of the fourth water washing is 50-60 ℃.
2. The method for cleaning the residual ash on the surface of the copper alloy plate strip for preparing the lead frame according to claim 1, which is characterized in that: the grade of the copper alloy plate strip is C19400.
3. The method for cleaning the residual ash on the surface of the copper alloy plate strip for preparing the lead frame according to claim 1, which is characterized in that: the degreasing agent is a neutral water-based degreasing agent, the passivating agent is a compound corrosion inhibitor mainly based on B.T.A, and the acid added in the pickling solution is pure sulfuric acid.
4. The method for cleaning the residual ash on the surface of the copper alloy plate strip for preparing the lead frame according to claim 1, which is characterized in that: and after the residual ash on the surface of the copper alloy plate strip is cleaned in the step S5, the surface cleanliness of the copper alloy plate strip is first grade.
5. The method for cleaning the residual ash on the surface of the copper alloy plate strip for preparing the lead frame according to claim 1, which is characterized in that: the pickling solution is replaced every half year.
6. The method for cleaning the residual ash on the surface of the copper alloy plate strip for preparing the lead frame according to claim 1, which is characterized in that: two layers of filter screens are arranged in an inlet pipeline of a cleaning tank for containing pickling solution, the distance between the filter screens is 50cm, and the material of the filter screens has high precision and acid resistance.
7. The method for cleaning the residual ash on the surface of the copper alloy plate strip for preparing the lead frame according to claim 6, wherein the method comprises the following steps: the material of filter screen is the stainless steel net, and the filter fineness of filter screen is 15 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010932518.4A CN112267123A (en) | 2020-09-08 | 2020-09-08 | Method for cleaning residual ash on surface of copper alloy plate strip for preparing lead frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010932518.4A CN112267123A (en) | 2020-09-08 | 2020-09-08 | Method for cleaning residual ash on surface of copper alloy plate strip for preparing lead frame |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112267123A true CN112267123A (en) | 2021-01-26 |
Family
ID=74348587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010932518.4A Pending CN112267123A (en) | 2020-09-08 | 2020-09-08 | Method for cleaning residual ash on surface of copper alloy plate strip for preparing lead frame |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112267123A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113083897A (en) * | 2021-04-07 | 2021-07-09 | 太原晋西春雷铜业有限公司 | Preparation method of high-uniformity surface of copper or copper alloy strip |
| CN113106466A (en) * | 2021-04-07 | 2021-07-13 | 太原晋西春雷铜业有限公司 | Method for solving white mark on surface of strip in cleaning process of finished lead frame product |
| CN115058670A (en) * | 2022-08-18 | 2022-09-16 | 太原晋西春雷铜业有限公司 | Preparation method of C19400 copper alloy lead frame material |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538710A (en) * | 2009-04-30 | 2009-09-23 | 杭州百木表面技术有限公司 | Method for continuously cleaning and passivating copper and copper alloy |
| CN106001159A (en) * | 2016-08-05 | 2016-10-12 | 徐高磊 | Production technology of copper and tin alloy strips |
| CN107695622A (en) * | 2017-09-22 | 2018-02-16 | 山西春雷铜材有限责任公司 | The preparation method of new energy car battery lug copper strips |
| CN107723719A (en) * | 2017-09-15 | 2018-02-23 | 中天合金技术有限公司 | A kind of cleaning of wide cut Ultrathin copper strip |
| CN107988570A (en) * | 2017-11-30 | 2018-05-04 | 中铝洛阳铜加工有限公司 | A kind of copper alloy plate strip paper tinsel low temperature destressing stretcher leveling technique |
| CN108754368A (en) * | 2018-05-31 | 2018-11-06 | 太原晋西春雷铜业有限公司 | A kind of preparation method for eliminating corson alloy strip surface informal voucher defect |
-
2020
- 2020-09-08 CN CN202010932518.4A patent/CN112267123A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538710A (en) * | 2009-04-30 | 2009-09-23 | 杭州百木表面技术有限公司 | Method for continuously cleaning and passivating copper and copper alloy |
| CN106001159A (en) * | 2016-08-05 | 2016-10-12 | 徐高磊 | Production technology of copper and tin alloy strips |
| CN107723719A (en) * | 2017-09-15 | 2018-02-23 | 中天合金技术有限公司 | A kind of cleaning of wide cut Ultrathin copper strip |
| CN107695622A (en) * | 2017-09-22 | 2018-02-16 | 山西春雷铜材有限责任公司 | The preparation method of new energy car battery lug copper strips |
| CN107988570A (en) * | 2017-11-30 | 2018-05-04 | 中铝洛阳铜加工有限公司 | A kind of copper alloy plate strip paper tinsel low temperature destressing stretcher leveling technique |
| CN108754368A (en) * | 2018-05-31 | 2018-11-06 | 太原晋西春雷铜业有限公司 | A kind of preparation method for eliminating corson alloy strip surface informal voucher defect |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113083897A (en) * | 2021-04-07 | 2021-07-09 | 太原晋西春雷铜业有限公司 | Preparation method of high-uniformity surface of copper or copper alloy strip |
| CN113106466A (en) * | 2021-04-07 | 2021-07-13 | 太原晋西春雷铜业有限公司 | Method for solving white mark on surface of strip in cleaning process of finished lead frame product |
| CN115058670A (en) * | 2022-08-18 | 2022-09-16 | 太原晋西春雷铜业有限公司 | Preparation method of C19400 copper alloy lead frame material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112267123A (en) | Method for cleaning residual ash on surface of copper alloy plate strip for preparing lead frame | |
| CN108165822B (en) | Preparation method of TA2 cold-rolled titanium strip for low-strength and easy-to-form welded pipe | |
| CN109622613B (en) | Processing method of 201 cold-rolled stainless steel strip | |
| CN108085704B (en) | Wire acid pickling process | |
| CN110820003A (en) | Cleaning and passivating process for special-shaped copper strip | |
| CN105506536B (en) | A kind of resistance to etching technique of carbon steel frying pan | |
| CN109016774B (en) | Aluminum alloy brazing compounding process for automobile heat exchange system | |
| CN111893496B (en) | Pickling agent for copper and copper alloy finishing process | |
| CN115532833A (en) | Cold rolling production process of cold-rolled hard titanium plate | |
| CN113215372B (en) | Production method of stainless steel band for medical clamp | |
| CN114472515A (en) | Preparation method of multi-element alloy thin strip for lead frame | |
| CN113198867A (en) | Production process of copper strip | |
| CN114472521A (en) | Production method of rough surface acid continuous rolling hot-rolled pickled plate | |
| KR20190072768A (en) | How to Remove Scale and Improve Surface Cleanliness of Automotive Fasteners | |
| WO2021217950A1 (en) | Drawing and rust removal process for steel wire | |
| CN107345302A (en) | A kind of precision metal bloom cleaning agent | |
| CN109304371B (en) | Production process of tab copper material | |
| CN113106466A (en) | Method for solving white mark on surface of strip in cleaning process of finished lead frame product | |
| KR20090067870A (en) | Method for manufacturing ferrite stainless steel having improved surface roughness | |
| CN118180174A (en) | Preparation method for improving emulsion white strip defect of C19400 copper alloy strip after emulsion cold rolling | |
| CN114289530A (en) | Continuous finish rolling process for 304 stainless steel thin rolled plate | |
| CN111058064A (en) | Nickel plating process for aluminum alloy | |
| CN113881834B (en) | Oxygen-free copper-316L stainless steel layered composite material for high temperature and preparation process thereof | |
| CN113818018B (en) | Surface regulator for metal substrate and surface treatment method of metal substrate | |
| CN114427097A (en) | Citric acid copper alloy pickling solution and preparation method thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210126 |
|
| RJ01 | Rejection of invention patent application after publication |