CN115058750A - Surface treatment process for high-strength handle - Google Patents
Surface treatment process for high-strength handle Download PDFInfo
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- CN115058750A CN115058750A CN202210885321.9A CN202210885321A CN115058750A CN 115058750 A CN115058750 A CN 115058750A CN 202210885321 A CN202210885321 A CN 202210885321A CN 115058750 A CN115058750 A CN 115058750A
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- handle
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- surface treatment
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004381 surface treatment Methods 0.000 title claims abstract description 18
- 238000009713 electroplating Methods 0.000 claims abstract description 18
- 238000002161 passivation Methods 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 18
- 230000004913 activation Effects 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 4
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 4
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 claims description 3
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 claims description 3
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 3
- 239000012670 alkaline solution Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910001453 nickel ion Inorganic materials 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000001119 stannous chloride Substances 0.000 claims description 3
- 235000011150 stannous chloride Nutrition 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 229910052763 palladium Inorganic materials 0.000 claims 1
- 238000007788 roughening Methods 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000011241 protective layer Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- 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
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
-
- 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
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a surface treatment process for a high-strength handle, which relates to the field of hardware handles and comprises the following steps: the method comprises the following steps: the die-cast handle is polished by using a polishing machine, and burrs on the surface are removed, the die-cast handle is subjected to burr treatment firstly and then deoiled, so that the quality influence of processes such as subsequent electroplating, passivation and the like is effectively avoided, triple roughening is carried out simultaneously, the roughening temperature and concentration are gradually reduced, the damage to the surface of the handle is effectively avoided, the binding force between the surface of the handle and an electroplated layer is larger, the electroplating quality of the handle is greatly improved, the surface strength of the handle is greatly improved, meanwhile, the air pressure is adopted for stirring and passivating, a tighter passivation film is formed on the coating of the handle, the strength of the handle is further improved, and the service life of the handle is greatly prolonged.
Description
Technical Field
The invention relates to the field of hardware handles, in particular to a surface treatment process for a high-strength handle.
Background
In our daily life, the use of handle is comparatively extensive, and because present processing technology problem makes the damage degree of handle higher, and the precision of present handle processing technology surface treatment is not enough, greatly reduced its intensity for the life of handle is shorter, and is very easily oxidized simultaneously, and the paint of spraying drops easily, influences the aesthetic property.
Disclosure of Invention
The invention aims to provide a surface treatment process for a high-strength handle, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a surface treatment process for a high-strength handle comprises the following steps:
the method comprises the following steps: polishing the die-cast handle by using a polishing machine, and removing burrs on the surface;
step two: removing oil from the burr-removed handle by using oil removing powder with the concentration of 8-10 g/L, and then performing mixed multiple cleaning;
step three: carrying out triple coarsening on the cleaned handle, and finally washing with pure water at the temperature of 55-65 ℃;
step four: activating the coarsened pull handle, and then washing with pure water at the temperature of 25 ℃;
step five: immersing the activated handle in alkaline solution for neutralization, and then washing and drying
Step six: carrying out surface zinc and nickel electroplating treatment on the dried handle, controlling the temperature of electroplating solution to be 30-37 ℃, placing the handle in an electroplating bath, and controlling the current to be 1.8A/dm 2 The time is two hours, and water washing is carried out after the completion;
step seven: putting the electroplated handle into a passivation tank for passivation, controlling the pH value of the passivation tank to be 2-2.5, controlling the temperature to be 20-25 ℃, stirring under the pressure of 8-10 KPa of air pressure, keeping for two minutes, taking out and washing with water;
step eight: and (3) placing the passivated handle in a sealed chamber at the temperature of 25-35 ℃, carrying out sealed coating spraying, taking out and drying to obtain the finished handle.
Preferably, the hybrid multiple cleaning in the second step comprises one of: washing with water at 25 deg.C; II, secondly, the method comprises the following steps: carrying out ultrasonic cleaning; thirdly, the method comprises the following steps: pickling with sulfuric acid, the concentration is 1050ml/L, and the cleaning time is 3 minutes.
Preferably, the oil removal temperature in the second step is 60 ℃, and the time is controlled to be 4 minutes.
Preferably, the triple coarsening in the third step comprises first coarsening, second coarsening and third coarsening, the first coarsening process temperature is 72.5 ℃ and the time is six minutes, the second coarsening process temperature is 65 ℃ and the time is twelve minutes, the third coarsening process temperature is 60 ℃ and the time is twelve minutes, and the coarsening liquid concentrations of the first coarsening, the second coarsening and the third coarsening are respectively 420g/L, 400g/L and 380 g/L.
Preferably, the roughening solution is a mixture of chromic acid and sulfuric acid, and the ratio of the chromic acid to the sulfuric acid is 11: 10.
preferably, the activation in the fourth step includes pre-activation and activation, the pre-activation is carried out by placing the coarsened handle in 150ml/L hydrochloric acid for soaking for 4 minutes, and the activation solution for activation is a mixed solution of 240ml/L hydrochloric acid, 27.ppm metallic palladium and 5g/L stannous chloride, the temperature is controlled at 25 ℃, and the time is 3 minutes.
Preferably, the electroplating solution in the sixth step comprises zinc ions with the concentration of 9g/L, nickel ions with the concentration of 1.75g/L, sodium hydroxide with the concentration of 120g/L and water.
Preferably, in the step eight, the coating is sealed and kept still for two minutes after the sealing spraying is carried out, and then the coating is taken out.
Preferably, the drying in the step eight is to perform primary shaping drying at 100 ℃ for five minutes, take out the molded product and then dry the molded product at 200 ℃ for twenty-five minutes, so that the protective layer formed on the surface of the handle is prevented from being damaged by sudden high temperature, and meanwhile, the surface protective layer is damaged by moisture due to too low drying temperature.
In conclusion, the beneficial effects of the invention are as follows:
according to the invention, the burr treatment is firstly carried out on the die-cast handle, then the oil removal is carried out, so that the quality influence of the processes such as subsequent electroplating and passivation is effectively avoided, the triple roughening is carried out simultaneously, the roughening temperature and concentration are gradually reduced, so that the damage to the surface of the handle is effectively avoided, the binding force between the surface of the handle and an electroplated layer is larger, the electroplating quality of the handle is greatly improved, the surface strength of the handle is greatly improved, and meanwhile, the air pressure is adopted for stirring and passivation, so that a tighter passivation film is formed on a handle coating, the strength of the handle is further improved, and the service life of the handle is greatly prolonged.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a structural diagram of a structural framework of a surface treatment process for a high-strength handle according to the present invention;
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is described in detail below with reference to fig. 1, which provides an embodiment of the invention: a surface treatment process for a high-strength handle comprises the following steps:
the method comprises the following steps: polishing the die-cast handle by using a polishing machine, and removing burrs on the surface;
step two: removing oil from the burr-removed handle by using oil removing powder with the concentration of 8-10 g/L, and then performing mixed multiple cleaning;
step three: carrying out triple coarsening on the cleaned handle, and finally washing with pure water at the temperature of 55-65 ℃;
step four: activating the coarsened pull handle, and then washing with pure water at the temperature of 25 ℃;
step five: immersing the activated handle in alkaline solution for neutralization, and then washing and drying
Step six: carrying out surface zinc and nickel electroplating treatment on the dried handle, controlling the temperature of electroplating solution to be 30-37 ℃, placing the handle in an electroplating bath, and controlling the current to be 1.8A/dm 2 The time is two hours, and water washing is carried out after the completion;
step seven: putting the electroplated handle into a passivation tank for passivation, controlling the pH value of the passivation tank to be 2-2.5, controlling the temperature to be 20-25 ℃, stirring under the pressure of 8-10 KPa of air pressure, keeping for two minutes, taking out and washing;
step eight: and (3) placing the passivated handle in a sealed chamber at the temperature of 25-35 ℃, carrying out sealed coating spraying on the coating, taking out and drying to obtain a finished product handle.
In addition, in one embodiment, the hybrid multi-washing in the second step includes one of: washing with water at 20-30 ℃; II, secondly: carrying out ultrasonic cleaning; thirdly, the method comprises the following steps: pickling with sulfuric acid, the concentration is 1050ml/L, and the cleaning time is 3 minutes.
In addition, in one embodiment, the oil removing temperature in the second step is 55-70 ℃, and the time is controlled to be 4 minutes.
In addition, in one embodiment, the triple coarsening in the third step includes first coarsening, second coarsening and third coarsening, the first coarsening process temperature is 70-75 ℃ for six minutes, the second coarsening process temperature is 60-70 ℃ for twelve minutes, the third coarsening process temperature is 55-65 ℃ for twelve minutes, and the coarsening liquid concentrations of the first coarsening, the second coarsening and the third coarsening are respectively 420g/L, 400g/L and 380 g/L.
Additionally, in one embodiment, the roughening solution is a chromic acid and sulfuric acid mixture, and the ratio is 11: 10.
in addition, in one embodiment, the activation in the fourth step includes pre-activation and activation, the pre-activation is performed by placing the coarsened handle in 150ml/L hydrochloric acid to be soaked for 4 minutes, and the activation solution for activation is a mixed solution of 230 to 250ml/L hydrochloric acid, 25 to 30ppm metallic palladium and 5g/L stannous chloride, and the temperature is controlled at 25 ℃ for 3 minutes.
In addition, in one embodiment, the electroplating solution in the sixth step includes zinc ions with a concentration of 8-10 g/L, nickel ions with a concentration of 1.5-2 g/L, sodium hydroxide with a concentration of 110-130 g/L, and water.
In addition, in one embodiment, in the step eight, the coating is sealed and kept still for two minutes after the sealing spraying is carried out, and then the coating is taken out.
In addition, in one embodiment, the drying in the step eight is to perform drying at a temperature of 80-100 ℃ for five minutes to perform preliminary shaping and drying, and then to perform drying at a temperature of 180-200 ℃ for twenty-five minutes after being taken out, so that the protective layer formed on the surface of the handle is prevented from being damaged by sudden high temperature, and meanwhile, the surface protective layer is damaged by moisture due to too low drying temperature.
In conclusion, the pressure-cast handle is subjected to burr treatment and oil removal, so that the quality influence of processes such as subsequent electroplating and passivation is effectively avoided, triple roughening is performed, the roughening temperature and concentration are gradually reduced, the damage to the surface of the handle is effectively avoided, the binding force between the surface of the handle and an electroplated layer is larger, the electroplating quality of the handle is greatly improved, the surface strength of the handle is greatly improved, and meanwhile, the handle is stirred and passivated by air pressure, so that a tighter passivation film is formed on a handle coating, the strength of the handle is further improved, and the service life of the handle is greatly prolonged.
The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.
Claims (9)
1. A surface treatment process for a high-strength handle is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: polishing the die-cast handle by using a polishing machine, and removing burrs on the surface;
step two: removing oil from the burr-removed handle by using oil removing powder with the concentration of 8-10 g/L, and then performing mixed multiple cleaning;
step three: carrying out triple coarsening on the cleaned handle, and finally washing with pure water at the temperature of 55-65 ℃;
step four: activating the coarsened pull handle, and then washing with pure water at the temperature of 25 ℃;
step five: immersing the activated handle in alkaline solution for neutralization, and then washing and drying
Step six: carrying out surface zinc and nickel electroplating treatment on the dried handle, controlling the temperature of electroplating solution to be 30-37 ℃, placing the handle in an electroplating bath, and controlling the current to be 1.8A/dm 2 The time is two hours, and water washing is carried out after the completion;
step seven: putting the electroplated handle into a passivation tank for passivation, controlling the pH value of the passivation tank to be 2-2.5, controlling the temperature to be 20-25 ℃, stirring under the pressure of 8-10 KPa of air pressure, keeping for two minutes, taking out and washing with water;
step eight: and (3) placing the passivated handle in a sealed chamber at the temperature of 25-35 ℃, carrying out sealed coating spraying, taking out and drying to obtain the finished handle.
2. The surface treatment process for the high-strength pull handle according to claim 1, characterized in that: the mixed multi-cleaning in the second step comprises the following steps: washing with water at 20-30 ℃; II, secondly: carrying out ultrasonic cleaning; thirdly, the steps of: pickling with sulfuric acid, the concentration is 1050ml/L, and the cleaning time is 3 minutes.
3. The surface treatment process for the high-strength pull handle according to claim 1, characterized in that: and the oil removing temperature in the second step is 55-70 ℃, and the time is controlled to be 4 minutes.
4. The surface treatment process for the high-strength pull handle according to claim 1, characterized in that: the triple coarsening in the third step comprises first coarsening, second coarsening and third coarsening, wherein the temperature of the first coarsening process is 70-75 ℃, the time is six minutes, the temperature of the second coarsening process is 60-70 ℃, the time is twelve minutes, the temperature of the third coarsening process is 55-65 ℃, the time is twelve minutes, and the coarsening liquid concentrations of the first coarsening, the second coarsening and the third coarsening are respectively 420g/L, 400g/L and 380 g/L.
5. The surface treatment process for the high-strength pull handle according to claim 1, characterized in that: the coarsening liquid is a mixture of chromic acid and sulfuric acid, and the proportion is 11: 10.
6. the surface treatment process for the high-strength pull handle according to claim 1, characterized in that: and the activation in the fourth step comprises pre-activation and activation, the pre-activation is carried out by placing the coarsened handle in 150ml/L hydrochloric acid for soaking for 4 minutes, and then the activation is carried out, the activated activating solution is a mixed solution of 230-250 ml/L hydrochloric acid, 25-30 ppm metal palladium and 5g/L stannous chloride, the temperature is controlled at 25 ℃, and the time is 3 minutes.
7. The surface treatment process for the high-strength pull handle according to claim 1, characterized in that: the electroplating solution in the sixth step comprises zinc ions with the concentration of 8-10 g/L, nickel ions with the concentration of 1.5-2 g/L, sodium hydroxide with the concentration of 110-130 g/L and water.
8. The surface treatment process for the high-strength pull handle according to claim 1, characterized in that: and in the step eight, after sealed spraying, sealing and standing for two minutes, and then taking out.
9. The surface treatment process for the high-strength pull handle according to claim 1, characterized in that: and the drying in the step eight is to perform drying at the temperature of 80-100 ℃ for five minutes to perform preliminary shaping and drying, and then to perform drying at the temperature of 180-200 ℃ for twenty-five minutes after being taken out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210885321.9A CN115058750A (en) | 2022-07-26 | 2022-07-26 | Surface treatment process for high-strength handle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210885321.9A CN115058750A (en) | 2022-07-26 | 2022-07-26 | Surface treatment process for high-strength handle |
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| Publication Number | Publication Date |
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| CN115058750A true CN115058750A (en) | 2022-09-16 |
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| CN202210885321.9A Pending CN115058750A (en) | 2022-07-26 | 2022-07-26 | Surface treatment process for high-strength handle |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105951142A (en) * | 2016-05-19 | 2016-09-21 | 南通柏源汽车零部件有限公司 | Pretreatment technology for electroplating of automobile door handle |
| CN106757240A (en) * | 2016-11-30 | 2017-05-31 | 重庆帅邦机械有限公司 | A kind of pre-treating technology of automobile external part plating |
| CN107794555A (en) * | 2017-09-13 | 2018-03-13 | 杭州莱源环保科技有限公司 | A kind of pre-treating technology of the double-colored plating of automobile decoration piece |
| CN108588775A (en) * | 2018-04-04 | 2018-09-28 | 延康汽车零部件如皋有限公司 | A kind of pre-treating technology of PC material product plating |
| CN112226795A (en) * | 2020-10-09 | 2021-01-15 | 宁波晶美科技有限公司 | Manufacturing method of automobile door handle |
-
2022
- 2022-07-26 CN CN202210885321.9A patent/CN115058750A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105951142A (en) * | 2016-05-19 | 2016-09-21 | 南通柏源汽车零部件有限公司 | Pretreatment technology for electroplating of automobile door handle |
| CN106757240A (en) * | 2016-11-30 | 2017-05-31 | 重庆帅邦机械有限公司 | A kind of pre-treating technology of automobile external part plating |
| CN107794555A (en) * | 2017-09-13 | 2018-03-13 | 杭州莱源环保科技有限公司 | A kind of pre-treating technology of the double-colored plating of automobile decoration piece |
| CN108588775A (en) * | 2018-04-04 | 2018-09-28 | 延康汽车零部件如皋有限公司 | A kind of pre-treating technology of PC material product plating |
| CN112226795A (en) * | 2020-10-09 | 2021-01-15 | 宁波晶美科技有限公司 | Manufacturing method of automobile door handle |
Non-Patent Citations (1)
| Title |
|---|
| 伍学高 等: "固定资产投资项目能评文件编制实务", vol. 01, 中国纺织出版社有限公司, pages: 219 - 220 * |
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