CN102605400B - Steel strip continuous copper plating process - Google Patents
Steel strip continuous copper plating process Download PDFInfo
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- CN102605400B CN102605400B CN201110290875.6A CN201110290875A CN102605400B CN 102605400 B CN102605400 B CN 102605400B CN 201110290875 A CN201110290875 A CN 201110290875A CN 102605400 B CN102605400 B CN 102605400B
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Abstract
The invention provides a steel strip continuous copper plating process. A cyanide copper plating process is adopted for electric plating. The process mainly comprises a pre-treatment process and an electric copper plating process, wherein the pre-treatment mainly comprises chemical oil removal, electrolysis oil removal, water washing, activation, water washing and the like. The electric plating process mainly comprises copper pre-plating, main copper plating, recovery, water washing and the like. In the steel strip continuous copper plating process, each process tank adopts a sealed trapezoidal groove. For the recovery mode, an atomizing spraying mode is adopted for recovery. In the copper plating process, the electric deposition speed is accelerated through the cyclic filtering of a filtering machine, and brightening agents used in the electric plating are inorganic brightening agents using selenite as main brightening agents or other inorganic brightening agents, so the desoldering phenomenon generated in the subsequent copper plating steel strip soldering work can be avoided. The steel strips are subjected to continuous copper plating, the speed and the efficiency are high, and smooth and compact plating layers can be obtained.
Description
Technical field
The present invention relates to the technical field of alkaline copper plating, specifically continuous copper-plating of steel strip.
Background technology
Along with China's industrial expansion, the especially develop rapidly of automobile and other industries, increases day by day to the demand of copper and brass work.But China is that a poor copper is national, and the main dependence on import of copper, adds copper price moving quickly upward in the world, brings larger cost pressure to the industries such as China's automobile.Through demonstration and facts have proved, at automobile, the industries such as household electrical appliances, it is feasible that steel copper facing goods replace brass work, performance even is in some aspects more better than copper on the contrary.Copper facing steel band is mainly used to produce side enlightening pipe, is generally applied in the aspects such as automobile oil pipe, floor heating pipe, air-conditioner pipe.The still economic problems that use iron instead of copper not, can also reduce carbon emission in a large number.Steel band copper facing has good Social benefit and economic benefit thus.Utilize cyanide electroplating, can obtain densification, the coating that smooth, bonding force is good, so continuous copper-plating of steel strip adopts cyanide copper plating process.
Summary of the invention
Continuous copper-plating of steel strip, mainly comprises pretreatment process and electro-coppering process.Pre-treatment mainly comprises electrochemical deoiling, electrolytic degreasing, washing, activation, washing etc.; Electroplating process mainly comprises pre-copper facing, main copper facing, recovery, washing etc.In continuous copper-plating of steel strip, each technology groove adopts the dovetail groove of closed; Way of recycling adopts the mode of atomizing spray to reclaim.Circulating filtration by filter in copper facing process accelerates electrodeposition rate; The brightening agent using in plating is to take inorganic brightening agent or other the inorganic brightening agents that selenite is main brightener, can avoid like this occurring " sealing-off " phenomenon in the work of follow-up copper plated steel welding.
Embodiment
Continuous copper-plating of steel strip provided by the invention, mainly comprises pretreatment process and electro-coppering process.Described pretreatment process comprises hot water wash, oil removing, washing and activation, water washing process.Wherein oil removal treatment adopts electrochemical deoiling to combine with the male-female utmost point mode that oil removing mutually combines.
Wherein, hot water wash adopts the hot water of 70～80 ℃ to clean 20～30s.
Wherein, oil removal treatment comprises electrochemical deoiling and electrolytic degreasing, and electrolytic degreasing is male-female utmost point associating oil removing.First, carry out electrochemical deoiling, the time is 1～3min, then carries out electrolytic degreasing, during electrolytic degreasing, and first negative electrode oil removing 1min, then anode oil removing 15s.
In described electrochemical deoiling, degreasing fluid is comprised of highly basic, silicate, phosphoric acid salt and carbonate, and degreasing fluid temperature is 60～80 ℃.Electrolytic degreasing liquid is active alkali, and alkali liquid temperature is 60～80 ℃, and current density is 8～10A/dm
2.
Wherein, in activation treatment, the etchant in activation solution is hydrochloric acid, concentration 20g/L, and solution temperature is 35 ± 5 ℃, cathode current density is 7～10A/dm
2, erosion time is 20～30s.
Wherein, it is low chlorine ion water or the pure water below 600ppm that the washing after the washing after oil removing and activation all adopts concentration, cleans, and cleaning water temperature is 30～40 ℃.
According to invention, provide continuous copper-plating of steel strip, wherein electroplating process comprises pre-copper facing and continuous main copper facing.Preplating copper electrolyte is mainly comprised of cuprous cyanide, sodium cyanide and sodium carbonate, and during plating, cathode current density is 0.5～1A/dm
2, temperature is 40～50 ℃, electroplating time is 1～2min.Continuously main copper-plated plating solution is mainly comprised of cuprous cyanide, sodium cyanide and sodium hydroxide, and during plating, cathode current density is 0.2～2A/dm
2, temperature is 55～65 ℃, electroplating time is selected according to the thickness of coating.In electroplating process, adopt inorganic brightening agent or other inorganic brightening agents that selenite is main brightener.
Embodiment 1
This embodiment is for illustrating the method for continuous copper-plating of steel strip provided by the invention.
(1) pre-treatment
(1). hot water wash: the wide steel band of 300mm is immersed in completely in the hot water of 70～80 ℃, cleans 20～30s.
(2). electrochemical deoiling: the steel band after step (1) is processed is immersed in the degreasing fluid being comprised of highly basic, silicate, phosphoric acid salt and carbonate, and degreasing fluid temperature is 60～80 ℃, and the oil removing time is 2min.
(3). electrolytic degreasing: the steel band after step (2) is processed is immersed in electrolytic degreasing liquid, and alkali liquid temperature is 60～80 ℃, and current density is 8～10A/dm
2, first negative electrode oil removing 1min, then anode oil removing 15s.
After oil removing, by concentration, be low chlorine ion water or the pure water below 600ppm, clean.
(4). activation: the steel band after step (2) is processed is immersed in activation solution, and the etchant of activation solution is hydrochloric acid, concentration 20g/L, solution temperature is 35 ± 5 ℃, cathode current density is 7～10A/dm
2, erosion time is 25s.After corroding, by concentration, be low chlorine ion water or the pure water below 600ppm, clean.
(2) electro-coppering
(5). pre-copper facing: the steel band that step (4) is obtained is immersed in the plating solution being comprised of cuprous cyanide, sodium cyanide and sodium carbonate, electroplates 2min.During plating, cathode current density is 1A/dm
2, temperature is 50 ℃.
(6). continuous main copper facing: the steel band that step (5) is obtained is immersed in the plating solution being comprised of cuprous cyanide, sodium cyanide and sodium hydroxide, during plating, cathode current density is 1A/dm
2, temperature is 55 ℃, electroplating time 30min.The copper facing steel band note making after plating is 1#.
The dovetail groove that the technology groove using in embodiment 1 is closed
Embodiment 2
This embodiment is for illustrating the method for continuous copper-plating of steel strip provided by the invention.
According to the method for embodiment 1, the wide steel band of 300mm is electroplated, the technology groove using in embodiment 2 is open coating bath, and remaining is identical with the condition of embodiment 1.The copper facing steel band note making after plating is 2#.
Embodiment 3
This embodiment is for illustrating the method for continuous copper-plating of steel strip provided by the invention.
According to the method for embodiment 1, the wide steel band of 300mm is electroplated, different, do not carry out electrolytic degreasing, remaining is identical with the condition of embodiment 1.The copper facing steel band note making after plating is 3#.
Embodiment 4
This embodiment is for illustrating the method for continuous copper-plating of steel strip provided by the invention.
According to the method for embodiment 1, the wide steel band of 300mm is electroplated, different, when electroplating, do not carry out pre-copper facing, remaining is identical with the condition of embodiment 1.The copper facing steel band note making after plating is 4#.
Embodiment 5
This embodiment is for illustrating the method for continuous copper-plating of steel strip provided by the invention.
According to the method for embodiment 1, the wide steel band of 300mm is electroplated, different, when electroplating, use inorganic brightening agent or other inorganic brightening agents that selenite is main brightener.Remaining is identical with the condition of embodiment 1.The copper facing steel band note making after plating is 5#.
Embodiment 6
This embodiment is for illustrating the method for continuous copper-plating of steel strip provided by the invention.
According to the method for embodiment 1, the wide steel band of 300mm is electroplated, different, when electroplating, use organic brightening agent.Remaining is identical with the condition of embodiment 1.The copper facing steel band note making after plating is 6#.
Note: all do not use brightening agent in embodiment 1-4.
Coating performance test
The plated item by the following method embodiment 1-3 being obtained carries out the test of high bake, sticking power test and cold-hot impact property, and the outward appearance of plating piece is estimated, and result is as shown in table 1.
(1). high bake: each plating piece is toasted to 30min at 180 ℃, then naturally cool to room temperature, observe and have or not foaming phenomenon.
(2). sticking power test
Testing standard: ISO 2409
Testing method: use blade to mark at coating surface the grid that the length of side is 1mm.Guarantee that cut is all cut to the matrix of copper facing steel band.Both direction along cut is respectively brushed 5 times with brush.Adhesive tape is sticky from the teeth outwards, with finger tip, wiping belt is tight, guarantee the good contact with coating, when 5min, from the free end of adhesive tape, with the angle of 60 °, in 0.5-1s, throw off adhesive tape is well-regulated.
Grade classification
0 grade: the edge of otch is completely level and smooth, the square of grid does not all peel off;
1 grade: the area that peels off part is not more than and 5% of the adhesive tape area of Surface Contact;
2 grades: the area that peels off part is greater than 5%, and is no more than 15%;
3 grades: the area that peels off part is greater than 15%, and is no more than 35%;
4 grades: the area that peels off part is greater than 35%, and is no more than 65%;
5 grades: the area that peels off part is greater than 65%.
Acceptable criterion: 0 grade and 1 grade of acceptance.
(3). temperature shock
Testing method: plating piece is respectively placed to 45min at-40 ℃ and 85 ℃ of each temperature, is one-period, is less than 10s switching time, in totally 27 cycles, at room temperature recovers 2h after testing.Then observe sample situation.
Acceptable criterion: product surface coating is without cracking, bubble, the phenomenon coming off.
(4). observe appearance: whether smoothly observe workpiece surface.
(5). thickness measurement: use magnetic-type gage to measure thickness of coating.
(6). porosity measurement
Measuring method: paste filter paper method.The wetting paper that is soaked with test soln is affixed on pretreated tested intercalation upper, the test solution on filter paper infiltrates in hole and intermediate deposit or matrix metal effect, generates to have thing and levy the spot of color and show on filter paper.Then there to be the number of color spot look to evaluate coating porosity on filter paper.
In addition 1#-6# is carried out to welding test, observe and whether occur sealing-off phenomenon.
Table 1
As can be seen from Table 1, the present invention, in continuous steel strip electroplating, by using electrochemical deoiling, male-female utmost point associating oil removing to combine and process, increases strike copper plating order, can strengthen the bonding force of coating, guarantees workpiece outward appearance.By using closed dovetail groove can improve electrodepositing speed.In continuous copper-plating of steel strip, " the sealing-off phenomenon " occurring while using inorganic brightening agent can avoid workpiece welding.
Claims (1)
1. continuous copper-plating of steel strip adopts cyanide copper plating process to electroplate, and mainly comprises pretreatment process and electro-coppering process, and pre-treatment mainly comprises electrochemical deoiling, electrolytic degreasing, washing, activation, washing; Electroplating process mainly comprises pre-copper facing, main copper facing, recovery, washing, it is characterized in that: the technology groove in continuous copper-plating of steel strip adopts the trapezoidal technology groove with viewing window of closed; In continuous copper-plating of steel strip, adopt the mode of atomizing spray to reclaim the remaining plating solution on steel band;
Concrete electroplating technology flow process is as follows:
(1) the electrochemical deoiling liquid in pretreatment process mainly contains highly basic, silicate, phosphoric acid salt and carbonate composition, and degreasing fluid temperature is 60～80 ℃;
(2) in pretreatment process, electrolytic degreasing liquid is active alkali, and alkali liquid temperature is 60～80 ℃, and current density is 8～10A/dm
2;
(3) in pretreatment process, electrolytic degreasing adopts male-female utmost point associating oil removing, wherein the negative electrode oil removing time long, the anode oil removing time is short;
(4) in pretreatment process, the etchant in activation solution is hydrochloric acid, concentration 20g/L, and solution temperature is 35 ± 5 ℃, cathode current density is 7～10A/dm
2, erosion time is 20～30s;
(5) in electro-coppering, adopt 1 the pre-coating bath being arranged in order, 5 coating baths, 1 accumulator tank and 1 rinse bath;
(6) in continuous copper-plating of steel strip, in coating bath, plating solution, by the circulating filtration of filter, stirs, and accelerates electrodeposition rate;
(7) in electro-coppering, preplating copper electrolyte is mainly comprised of cuprous cyanide, sodium cyanide and sodium carbonate, and during plating, cathode current density is 0.5～1A/dm
2, temperature is 40～50 ℃, electroplating time is 1～2min;
(8) main copper facing adopts the mode of multi-work-station continuous electroplating, and plating solution is mainly comprised of cuprous cyanide, sodium cyanide and sodium hydroxide, and during plating, cathode current density is 0.2～2A/dm
2, temperature is 55～65 ℃, electroplating time is selected according to the thickness of coating;
(9) washing of the cleaning in each process employing concentration is low chlorine ion water or the pure water below 600ppm;
(10) brightening agent using in electroplating is to take the inorganic brightening agent that selenite is main brightener.
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| CN201110290875.6A CN102605400B (en) | 2011-09-29 | 2011-09-29 | Steel strip continuous copper plating process |
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| CN201110290875.6A CN102605400B (en) | 2011-09-29 | 2011-09-29 | Steel strip continuous copper plating process |
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| CN102605400B true CN102605400B (en) | 2014-10-08 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103290463A (en) * | 2013-06-22 | 2013-09-11 | 兰溪市卓越电子有限公司 | Electroplating steel electrolytic oil removal method |
| CN103668374B (en) * | 2013-12-19 | 2016-05-18 | 湖南永盛新材料股份有限公司 | A kind of wide cut stainless steel band one side copper coating and electroplating bath |
| CN103924275B (en) * | 2014-05-11 | 2016-06-29 | 山东建筑大学 | A kind of continuous copper-plating of steel strip method |
| CN103952737B (en) * | 2014-05-11 | 2016-03-02 | 山东建筑大学 | A kind of technique of continuous copper-plating of steel strip |
| CN103938244B (en) * | 2014-05-11 | 2016-07-06 | 山东建筑大学 | A kind of electroplating technology of continuous copper-plating of steel strip |
| CN103938239A (en) * | 2014-05-11 | 2014-07-23 | 山东建筑大学 | Steel band continuous copper plating I |
| CN103938238B (en) * | 2014-05-11 | 2016-08-03 | 山东建筑大学 | A kind of continuous copper-plating of steel strip method |
| CN103952735B (en) * | 2014-05-11 | 2016-06-29 | 山东建筑大学 | A kind of continuous copper-plating of steel strip technique |
| CN104451832A (en) * | 2014-10-21 | 2015-03-25 | 德清县浙北通讯器材有限公司 | Liquid recovery device for wire electroplating equipment |
| CN105063732A (en) * | 2015-08-27 | 2015-11-18 | 天津佰金隆金属制品有限公司 | Device for cyanide-free copper plating |
| CN107620116A (en) * | 2017-11-03 | 2018-01-23 | 安徽新合富力科技有限公司 | A kind of powder metallurgy zirconium-base alloy surface treatment method |
| CN114214682B (en) * | 2021-12-22 | 2023-05-30 | 东莞市金瑞五金股份有限公司 | Electroplating process and electroplating equipment for copper plating of workpiece |
| CN114657616B (en) * | 2022-04-20 | 2024-07-02 | 阳江市鼎华晟新材料科技有限公司 | Copper plating process for stainless steel |
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| US2891896A (en) * | 1956-01-30 | 1959-06-23 | Fred I Nobel | Improved cyanide copper plating baths |
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| 李家柱.氰化物光亮镀铜工艺的研究.《电镀与涂饰》.2003,第22卷(第3期),35-38页. * |
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