CN103695991A - Electroplating current optimization method applicable to continuous electrotinning unit - Google Patents
Electroplating current optimization method applicable to continuous electrotinning unit Download PDFInfo
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- CN103695991A CN103695991A CN201310602446.7A CN201310602446A CN103695991A CN 103695991 A CN103695991 A CN 103695991A CN 201310602446 A CN201310602446 A CN 201310602446A CN 103695991 A CN103695991 A CN 103695991A
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Abstract
The invention provides an electroplating current optimization method applicable to a continuous electrotinning unit. The method comprises the following steps: (1) making a steel coil production plan according to plating thickness and carrying out continuous production of steel coils; (2) starting all the electroplating passes of the unit when producing a tin plate with plating thickness of no less than 5.6 g/m<2>, and starting half of the electroplating passes of the unit when producing a tin plate with plating thickness of no more than 2.8 g/m<2>; (3) when changes of plating specifications cause reduction of total current, maintaining the number of started electroplating passes to be unchanged while changing current distribution of each pass to reduce total current for front and rear steel coils with plating thickness in a same divided interval, and halving the number of plating baths while changing current distribution of each pass to reduce total current for front and rear steel coils with plating thickness in different divided intervals; and (4) when speed reduction of the unit causes reduction of total current, maintaining the number of started electroplating passes to be unchanged while changing current distribution of each pass to reduce total current. The method provided by the invention takes high current density distribution principles into consideration, employs a small number of plating baths for thin strip steel and enables distribution current density to be high, thereby guaranteeing electroplating quality.
Description
Technical field
The present invention relates to a kind of plating control method, be specifically related to a kind of electroplating current optimization method that is applicable to continuous electroplating tin unit.
Background technology
Band steel continuous electroplating tin unit, adopts the series connection of multi-pass plating tank zinc-plated.Each passage is provided with electroplated electrode, conductive rollers, deflector roll.Band steel is operation continuously between each passage, carries out zinc-plated.The zinc-plated amount of belt steel surface is with band steel during by whole passage, and the total current that each passage electroplated electrode passes through is directly proportional.
Electric current is by strip width, thickness of coating, electroplating efficiency, unit speed calculative determination.When strip width narrows down, thickness of coating step-down or unit speed be when reduce, and may cause that total current reduces.Total current reduces can be by reducing coating bath number or reducing single groove electroplating current and realize.
When Japanese Patent JP2004131786A has pointed out that from improving the angle of electric life time of the level plating total current reduces, should guarantee full passage use, by reducing the allocation proportion of electric current in each passage, reduce total current; And point out the IrO that eleetrotinplate adopts
2electrode, in the low electroplating solution of pH value, when energising and power-off, steady state is different.During power-off, top layer IrO
2unstable, power on/off, can cause IrO repeatedly
2electrode constantly consumes, and affects electrode life.
But this Japanese Patent has only proposed the allocative decision of electroplating current from the angle of electrode life, do not consider the impact of electroplating current on electroplating quality.Different bath systems, corresponding best current density range, in approaching the scope of diffusion current density, coating is fine and close, and solidity to corrosion is high; In the scope far below diffusion current density, coating coarse grains, electroplating quality is poor, tin plate poor quality.It proposes the band steel to all specifications, all adopts and all electroplates passage.This scheme is being produced low thickness of coating as 2.8g/ m
2during tin plate below thickness, can make each passage electroplating current density extremely low, tin plate is of poor quality; Under limiting condition, even can not adopt full passage to produce.
In a plating tank, have 2 antianode plates, each positive plate is connected with 1 rectifier respectively, can control respectively each positive plate current switching.As because producing poor thickness product or because electroplating the sub-distribution of total road, cause, in same coating bath 2 antianode plates, having 1,2 or 3 positive plate no powers, remaining positive plate energising, positive plate at difference can become electroplating cathode so, and at positive plate surface precipitating metal tin.When this positive plate reuses, the metallic tin on top layer can affect positive plate Surface current distribution, causes thickness of coating uneven.Therefore,, when coating bath is electroplated road sub-distribution, should guarantee all pole plates while break-makes in same coating bath.
Electroplating total current is directly proportional to thickness of coating, strip width, unit speed.Unit speed set(ting)value is generally this with maximum unit speed corresponding to steel specification.In this context, electroplate total current and be subject to having the greatest impact of thickness of coating.According to GB/T2520-2008, tin plate thickness of coating specification is by 1.1 g/ m
2, 2.2 g/ m
2, 2.8 g/ m
2, 5.6 g/ m
2, 8.4 g/ m
2, 11.2 g/ m
2several tier group become uniform thickness plated product or poor thick plated product.By common specification tin plate is analyzed, with electroplating current, be equally assigned into calculating principle, thickness of coating≤2.8 g/ m
2tin plate generally use design to electroplate half following plating passage of passage; Thickness of coating>=5.6g/ m
2tin plate generally use design to electroplate passage plating passage over half.Thickness of coating≤2.8 g/ m
2if indivedual specifications adopt half following plating passage not produce with top speed, can consider to reduce unit speed and reduce and electroplate required total current.
Summary of the invention
The present invention In view of the foregoing completes.Its object is to provide a kind of electroplating current optimization method, while solving electroplating current change, pole plate repeatedly power on/off causes the problem that the pole plate life-span reduces, and takes into account the requirement that electroplating quality should adopt high current density as far as possible simultaneously, and meets while electroplating in single coating bath all pole plates power on/off simultaneously.
For addressing the above problem, the present invention has adopted following method.
An electroplating current optimization method that is applicable to continuous electroplating tin unit, comprising:
(1) by thickness of coating, set and arrange the coil of strip production program, thickness of coating>=5.6g/ m
2coil of strip produce continuously, thickness of coating≤2.8 g/ m
2coil of strip produce continuously;
(2) production thickness of coating>=5.6g/ m
2tin plate, start unit and all electroplate passage; Production thickness of coating≤2.8 g/ m
2tin plate, start half plating passage of unit;
(3) because coating specifications vary causes total current, reduce, front and back coil of strip thickness of coating in same demarcation interval, starts and electroplates passage invariable number, by changing each road primary current, distributes to reduce total current; Before and after coil of strip thickness of coating in different demarcation interval, coating bath number reduces by half, and changes each road primary current simultaneously and distributes to reduce total current;
(4) while causing total current to reduce due to unit reduction of speed, start and electroplate passage invariable number, by changing each road primary current, distribute to reduce total current.
In (2) described operation, for thickness of coating≤2.8 g/ m
2tin plate, when determine electroplating passage number, if total coating bath number is even numbers, electroplates number of times and equal total coating bath number; If total coating bath number is odd number, electroplates number of times and equal 2 * ([total coating bath number/2]+1).While guaranteeing to electroplate with this, the pole plate of single coating bath is power on/off simultaneously, while avoiding electroplating, the pole plate of not switching on as negative electrode by zinc-plated.
In (3) (4) described operation, for guaranteeing that the most of coating of tin plate is to electroplate and obtain with high current density, owing to being with steel specifications vary or unit reduction of speed to cause, electroplating after total current reduction, with part coating bath, adopt minimum current density, the mode that part coating bath current density is still controlled in the excellent scope of electroplating quality reduces plating total current.Adopt the number of minimum current density by calculating.
Aforesaid method can guarantee that unit continues to produce with whole passages or half fixing passage within for some time, avoids coating specification frequent variations, the plating passage frequent variations of bringing, thus cause the frequent power on/off of electroplating pole plate; Aforesaid method is taken into account high current density distribution principle, and thin gauge strip is adopted to fewer object coating bath, can make to distribute current density higher, thereby guarantee electroplating quality.
Embodiment
Below by different embodiment, illustrate concrete scheme of the present invention and technique effect under different situations.
Embodiment 1:
10 of coating bath numbers, always electroplate 19, passage, and wherein the 1st passage of the 1st coating bath is for activation.
Production dimensions is 850mm * 0.3mm, and thickness of coating is 11.2g/m
2during tin plate, unit speed is 298m/min, and the plating passage needing is 19, and total current is 85.5KA, and electric current rate of utilization is 100%.
Production dimensions is 850mm * 0.3mm, and thickness of coating is 5.6g/m
2during tin plate, unit speed is 500m/min, and total current is 71.7KA, and electric current rate of utilization is reduced to 83.9%.
Adopt optimization method of the present invention, the electroplating current rate of utilization that the electroplating current rate of utilization of 1st ~ 17 passages reduces to 93.2%, the 18 ~ 19 passage reduces to 5%, i.e. (0.932x17+0.05x2)/19=0.839.The allocative decision of this operating mode and Japanese Patent JP2004131786A is as broad as long.All electrodes, all in noble potential, have guaranteed the stability of electrode; The zinc-plated amount on tin plate top layer 99.4% is all to electroplate under high current density, and electroplating quality is high.
Embodiment 2:
10 of coating bath numbers, always electroplate 19, passage, and wherein the 1st passage of the 1st coating bath is for activation.
Production dimensions is 850mm * 0.3mm, and thickness of coating is 11.2g/m
2during tin plate, unit speed is 298m/min, and the plating passage needing is 19, and total current is 85.5KA, and electric current rate of utilization is 100%.
Production dimensions is 750 mm * 0.16mm, and thickness of coating is 1.1g/m
2coil of strip time, unit speed is with hardness of steel specification to limit, top speed is 300m/min, total electroplating current is 7.46KA, electric current rate of utilization is reduced to 8.7%.Adopt
By the method for Japanese Patent JP2004131786A, electric current allocative decision is that the electric current rate of utilization of 19 passages is all reduced to 8.7%.The current density of each passage is far below diffusion current density, and electroplating quality is poor.
Adopt optimization method of the present invention, thickness of coating is 1.1g/m
2time, adopt 5 coating baths, electroplate passage for 9.The same electric weight that the energising amount of 1st ~ 2 passages reduces to 65.2%, the 3 ~ 9 passage reduces to 5%, i.e. (0.652x2+0.05x7)/19=0.087.Consequently, the power-off of part coating bath pole plate, but owing to having controlled the production program, the pole plate of power-off keeps off-position within for some time, and pole plate repeatedly power on/off state improves greatly.The zinc-plated amount on tin plate top layer 78.8% is all to electroplate under higher current density, and electroplating quality is high.
Embodiment 3:
10 of coating bath numbers, always electroplate 19, passage, and wherein the 1st passage of the 1st coating bath is for activation.
Production dimensions is 950mm * 0.3mm, and thickness of coating is 2.8g/m
2during tin plate, unit speed is 500m/min.According to this patent, the plating passage of setting is 9, and electric current rate of utilization is 100%.Production dimensions is 850 mm * 0.3mm, and thickness of coating is 1.1g/m
2coil of strip time, top speed is 500m/min, total electroplating current is 15.72KA, electric current rate of utilization is reduced to 38.8%.The same electric weight that the energising amount of 1st ~ 2 passages reduces to 81.1%, the 3 ~ 9 passage reduces to 5%, i.e. (0.811x4+0.05x5)/9=0.388.Consequently, all electrode power on/off states are constant, guaranteed the stability of electrode; The zinc-plated amount on tin plate top layer 92.8% is all to electroplate under higher current density, and electroplating quality is high.
Although with reference to a plurality of explanatory embodiment inventing, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other modification and embodiments, and these are revised and within embodiment will drop on the disclosed principle scope and spirit of the application.More particularly, in the scope of the disclosed specification sheets of the application and claim, can carry out multiple modification and improvement to the building block of subject combination layout and/or layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes will be also obvious.
Claims (3)
1. an electroplating current optimization method that is applicable to continuous electroplating tin unit, is characterized in that comprising:
(1) by thickness of coating, set and arrange the coil of strip production program, thickness of coating>=5.6g/ m
2coil of strip produce continuously, thickness of coating≤2.8 g/ m
2coil of strip produce continuously;
(2) production thickness of coating>=5.6g/ m
2tin plate, start unit and all electroplate passage; Production thickness of coating≤2.8 g/ m
2tin plate, start half plating passage of unit;
(3) because coating specifications vary causes total current, reduce, front and back coil of strip thickness of coating in same demarcation interval, starts and electroplates passage invariable number, by changing each road primary current, distributes to reduce total current; Before and after coil of strip thickness of coating in different demarcation interval, coating bath number reduces by half, and changes each road primary current simultaneously and distributes to reduce total current;
(4) while causing total current to reduce due to unit reduction of speed, start and electroplate passage invariable number, by changing each road primary current, distribute to reduce total current.
2. be applicable to according to claim 1 the electroplating current optimization method of continuous electroplating tin unit, it is characterized in that in (2) described operation, for thickness of coating≤2.8 g/ m
2tin plate, when determine electroplating passage number, if total coating bath number is even numbers, electroplates number of times and equal total coating bath number; If total coating bath number is odd number, electroplates number of times and equal 2 * ([total coating bath number/2]+1).
3. be applicable to according to claim 1 the electroplating current optimization method of continuous electroplating tin unit, it is characterized in that in described (3), (4) operation, for guaranteeing that the most of coating of tin plate is to electroplate and obtain with high current density, owing to being with steel specifications vary or unit reduction of speed to cause, electroplating after total current reduction, with part coating bath, adopt minimum current density, the mode that part coating bath current density is still controlled in the excellent scope of electroplating quality reduces plating total current.
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|---|---|---|---|
| CN201310602446.7A CN103695991A (en) | 2013-11-25 | 2013-11-25 | Electroplating current optimization method applicable to continuous electrotinning unit |
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| CN201310602446.7A CN103695991A (en) | 2013-11-25 | 2013-11-25 | Electroplating current optimization method applicable to continuous electrotinning unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107740173A (en) * | 2017-09-15 | 2018-02-27 | 首钢京唐钢铁联合有限责任公司 | Edge quality control method of high-tin-content tin plate |
| CN110093657A (en) * | 2019-06-13 | 2019-08-06 | 首钢京唐钢铁联合有限责任公司 | Electroplating efficiency self-learning control method and system |
| CN110552052A (en) * | 2019-09-05 | 2019-12-10 | 首钢京唐钢铁联合有限责任公司 | method and device for controlling electrotinning anode current |
Citations (3)
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| JPH11293498A (en) * | 1998-04-10 | 1999-10-26 | Nippon Steel Corp | Method for controlling plating coating weight |
| JP2004131786A (en) * | 2002-10-10 | 2004-04-30 | Nippon Steel Corp | Method for prolonging service life of electroplating electrode |
| CN1844479A (en) * | 2006-03-21 | 2006-10-11 | 无锡新大中钢铁有限公司 | Secondary alloying nickel and stannum -plating steel plate and belt and method for preparing same |
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2013
- 2013-11-25 CN CN201310602446.7A patent/CN103695991A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11293498A (en) * | 1998-04-10 | 1999-10-26 | Nippon Steel Corp | Method for controlling plating coating weight |
| JP2004131786A (en) * | 2002-10-10 | 2004-04-30 | Nippon Steel Corp | Method for prolonging service life of electroplating electrode |
| CN1844479A (en) * | 2006-03-21 | 2006-10-11 | 无锡新大中钢铁有限公司 | Secondary alloying nickel and stannum -plating steel plate and belt and method for preparing same |
Non-Patent Citations (3)
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| 曹绪铖: "镀锡机组电镀电流的控制", 《梅山科技》 * |
| 李其增: "电镀锡机组工艺涉及分析", 《上海冶金涉及》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107740173A (en) * | 2017-09-15 | 2018-02-27 | 首钢京唐钢铁联合有限责任公司 | Edge quality control method of high-tin-content tin plate |
| CN110093657A (en) * | 2019-06-13 | 2019-08-06 | 首钢京唐钢铁联合有限责任公司 | Electroplating efficiency self-learning control method and system |
| CN110552052A (en) * | 2019-09-05 | 2019-12-10 | 首钢京唐钢铁联合有限责任公司 | method and device for controlling electrotinning anode current |
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Application publication date: 20140402 |