CN101397691B - Apparatus and technology for controlling and improving plating solution PH value on fingerprint resistant production chain - Google Patents
Apparatus and technology for controlling and improving plating solution PH value on fingerprint resistant production chain Download PDFInfo
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- CN101397691B CN101397691B CN2007101519608A CN200710151960A CN101397691B CN 101397691 B CN101397691 B CN 101397691B CN 2007101519608 A CN2007101519608 A CN 2007101519608A CN 200710151960 A CN200710151960 A CN 200710151960A CN 101397691 B CN101397691 B CN 101397691B
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Abstract
The invention provides a technical method for controlling and raising the PH value of galvanizing solution on a fingerprint resistant continuous and automatic production line of the electro-galvanizing and roller coating of a rolled plate; the galvanizing solution rich in zinc ions enters a galvanizing bath from a dezincification bath; the technique is characterized in that: after entering the galvanizing bath from the dezincification bath, the galvanizing solution enters a circulating tank after going through an on-line filtering machine and then enters the galvanizing bath from the circulating tank; the galvanizing solution in the galvanizing bath returns to the galvanizing bath through the circulating tank; and the galvanizing solution is electrolyzed by the current density of 0.1A/dm<2> to 0.3A/dm<2> in an electrobath. The electrobath is internally provided with three anodes and two cathodes at intervals. The technical proposal has the advantages of not only removing hazardous metal impurities, but also increasing dezincification speed, particularly properly raising the PH value, increasing the overpotential of hydrogen, reducing hydrogen evolution, fining electro-galvanizing layers and reducing electric energy consumption, thereby greatly improving product quality.
Description
Affiliated technical field
The present invention relates to a kind of improvement to roll bending galvanizing-roller coat continuous and automatic production line of anti-fingerprint the and roll bending galvanizing-roller coat continuous and automatic production line of anti-fingerprint production technique.
Background technology
Roll bending galvanizing-roller coat fingerprint-proof plate continuous automatic production agent structure is the modern transmission mode of utilization, electro-galvanizing-roller coat two big process of surface treatment sections organically are connected on the production line, under the control of computer, guarantee roll bending from the uncoiling to the rolling, can keep all the time constant speed, synchronously, centering, operation continuously abreast, comprehensive in operational process, finish surface treatments such as roll bending degreasing, activation, plating, roller coat with high standards, single stage method is produced high-quality electrolytic galvanized sheet, fingerprint-proof plate.
In the zinc-plated operation stage, the roll bending of handling will be electroplated through plating tank.
As shown in Figure 1, roll bending 10 is wound in conductive rollers 11 and sinking roller 12, enters and export the plating bath 100 that is contained in the plating tank 1 vertically to enter the formula mode, and plating bath 100 energisings in the plating tank 1 are electroplated, and roll bending 10 is coated with the zinc layer in this process.
The anode that uses on high-speed, high yield electro-galvanizing automatic assembly line is inert anode, and the molten zinc groove of supply zine ion must be arranged on the streamline.As shown in Figure 2, the plating bath that molten zinc groove is rich in zine ion enters plating tank, so guarantees the supply of zine ion in the plating tank.
The pH value of electroplate liquid is directly connected to the quality and the sedimentation velocity thereof of electrolytic coating, and the pH value of the conventional Zinc Plating in Zinc Sulfate Solution liquid of prior art is between 3-3.5.
The current density of conventional Zinc Plating in Zinc Sulfate Solution is 1-3A/dm2 on roll bending galvanizing-roller coat fingerprint-proof plate continuous and automatic production line, and zinc sulfate plating bath pH value under the energising situation sharply is reduced to about 1.2, below the general pH value to 1.5, and corrosion zinc layer significantly just.Low like this pH value is in the metal ion galvanic deposit, and negative electrode is separated out hydrogen fiercely, causes current efficiency and sedimentation velocity to descend, and causes coating porous crack and bonding force not firm, often produces the air-flow striped on the coating, and then has reduced the corrosion resisting property of coating.
The manufacturer that has is for accelerating zinc layer sedimentation velocity, continue to increase current density, its result not only occurs the situation that the zine ion supply do not go up on the negative electrode and causes concentration polarization, simultaneously, it is serious that oxygen is analysed in the cathodic area, the electron reduction hydrogen ion, continuous effusion hydrogen, with the way of big electric current, strengthened and analysed the oxygen phenomenon, promote the pH value in cathodic area, but having neglected zine ion and other metallic impurity can form oxyhydroxide and deposit on negative electrode, make coating coarse, gloomy, even burn, some bubble hydrogens are trapped on the negative electrode, make coating produce pin hole, be mingled with subsalt, crystallization is loose, also has brittle crack.Facts have proved that overcome the lower influence of pH value with the method that improves current density, not only consume electric power influences quality product simultaneously.
PH value in the plating bath, especially near the plating bath pH value the negative electrode has material impact to corrosion resistance of coating, too high as pH value, the result that negative electrode is analysed oxygen will cause forming hydrogen-gasified thing subsalt precipitation near the negative electrode, thereby it is coarse that cathode surface is formed, even loose coating, otherwise low excessively as pH value, fierce liberation of hydrogen current efficiency of negative electrode and sedimentation velocity descend, cause coating porous crack and bonding force not good, reduce the corrosion resisting property of coating.
On the production line that vertically enters formula, there is the galvanized plate face of 1/3 process constantly to leave electric field all the time and is exposed among the air, because zinc is amphoteric metal, all can dissolved corrosion in the solution of bronsted lowry acids and bases bronsted lowry.The plate face that comes out from coating bath is attaching certain plating bath, and these plating baths are the solving zinc layer constantly, and the low more acidity of pH value is big more, and corrosion is just obvious more, if the plate face is smooth, and roller circularity and no problem with plate face parallelism, that is a uniform corrosion; If unfairness of plate face or roller circularity and parallelism be problem slightly, then non-uniform corrosion will cause striped, spot, aberration, has a strong impact on quality product.
Facts have proved that pH value is lower than the corrosion of 1.5 pairs of galvanized sheets will be obvious.
Control to pH value increased Tai-Ace S 150, boric acid in the past in conventional Zinc Plating in Zinc Sulfate Solution solution, pH value is cushioned, and effect is very little on rapid automatized streamline, adding the effect lacked weakens, added many and separated out easily, especially can increase the sediment of tank liquor, so should not adopt.
Summary of the invention
The invention provides the processing method of controlling and promote the plating bath pH value on a kind of roll bending galvanizing-roller coat continuous and automatic production line of anti-the fingerprint, its purpose is to overcome the prior art shortcoming, regulate the pH value of plating bath on the production line, it is reached between the 1.5-2, avoided the harm of low pH value and increased the negative interaction that electric current causes.
The present invention also provides the employed device of processing method of controlling and promote the plating bath pH value on a kind of roll bending galvanizing-roller coat continuous and automatic production line of anti-the fingerprint.
The technical solution adopted for the present invention to solve the technical problems is:
The processing method of control and lifting plating bath pH value on a kind of roll bending galvanizing-roller coat continuous and automatic production line of anti-the fingerprint, the plating bath that is rich in zine ion enters plating tank by molten zinc groove, it is characterized in that: after plating bath is introduced into electrolyzer by molten zinc groove, enter circulation groove again through filter on the line, enter plating tank by circulation groove again, the plating bath in the plating tank is got back to electrolyzer by circulation groove; Plating bath in electrolyzer with the current density electrolysis of 0.1-0.3A/dm2.
The device of control and lifting plating bath pH value on a kind of roll bending galvanizing-roller coat continuous and automatic production line of anti-the fingerprint, it is characterized in that: described device is the electrolyzer in the method according to claim 1, be provided with zinc matter anode and irony negative electrode in the electrolyzer, be arranged in power supply respectively; Electrolyzer be provided with pipeline by filter on the line after the communication loop groove, circulation groove also is provided with pipeline and is communicated with plating tank, molten zinc groove has pipeline to be communicated with electrolyzer.
At interval three anodes are set in the above-mentioned electrolyzer, two negative electrodes, structure is: anode-cathode-anode-cathode-anode.
The usefulness of technique scheme is: increase an electrolyzer on plating-roller coat continuous and automatic production line, can not only remove deleterious metallic impurity, increased molten zinc speed simultaneously, especially suitably promoted pH value, increased the overpotential of hydrogen, reduced hydrogen evolution phenomenon, refinement coating, reduced power consumption, avoided in the production process, because acidity is excessive, pH value is low excessively, and cause the corrosion of zinc coating, thereby greatly promoted quality product.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a prior art plating tank synoptic diagram;
Fig. 2 electroplates the stage process block diagram for prior art;
Fig. 3 electroplates the stage process block diagram for the present invention;
Fig. 4 is a cell construction synoptic diagram of the present invention.
Embodiment
As shown in Figure 3, the processing method of control and lifting plating bath pH value is for before plating bath enters plating tank by molten zinc groove on roll bending galvanizing-roller coat continuous and automatic production line of anti-fingerprint the of the present invention, plating bath is beaten by pump earlier by molten zinc groove earlier or the method for overflow enters electrolyzer, plating bath in electrolyzer with the current density electrolysis of 0.1-0.3A/dm2, plating bath after the electrolysis treatment enters circulation groove after filtering through filter on the line again, enter plating tank by circulation groove again, the plating bath in the plating tank is got back to electrolyzer by circulation groove.
Be illustrated in figure 4 as the device of realizing above-mentioned processing method, it has an electrolyzer 4, and electrolyzer 4 is of a size of 1/5 of whole electroplating cell body.Shelve 5 road copper bars above electrolyzer 4, wherein 3 roads are that anode copper bar 41,2 roads are negative electrode copper bar 42, are provided with at interval, form anode-cathode-anode-cathode-anodic structure.Hang zine plate or zink rod 410 on the anode copper bar 41, hang iron plate 420 on the negative electrode copper bar 42, form zinc matter anode and irony negative electrode, be arranged in power supply 6 respectively; Anode in the electrolyzer 4 is the soluble Zn anode.Electrolyzer 4 is provided with pipeline 402 by filter on the line 3 back communication loop grooves 2, also is provided with pipeline 204 between electrolyzer 4 and the plating tank and communicates, and circulation groove 2 also is provided with pipeline 201,102 and is communicated with plating tank 1, and molten zinc groove 5 has pipeline 504 to be communicated with electrolyzer 4.
Above-mentioned electrolyzer is equivalent to the function of two same volume electrolyzers owing to adopted the double cathode structure.Reduce floor space, correspondingly reduced fund input.
Electrolytic current density is conventional of the same type galvanized 1/10, and the electrolysis mode of low current mainly is the Ji Li that profit has the metal preferential deposition of electropotential calibration, removes deleterious metal ion in the solution, improves the purity of electroplating solution.
Electrolyzer is used for controlling and promoting the pH value of solution with little current electroanalysis removal of impurities the time.
In the electrolytic process
Anodic reaction Zn-2e → Zn2+
Cathodic reaction Zn2++2e → Zn
Simultaneously because the electropotential of H+ than Zn2+ just, so generate the Zn except that existing Zn2+ to obtain electronics at negative electrode, also exist H+ obtain electronics generate H2 ↑ side reaction.That is:
Zn2++2e→Zn
2H++2e→H2↑
H+ constantly reduces H+ concentration attenuating in generation H2 ↑ effusion tank liquor in reaction, so pH value is improved.
Facts have proved that antianode district solution after energising is because the anode electrochemical reaction, the Zn2+ that dissolves has little time to depend on electromigration to move away under minimum Faradaic current situation, chemical dissolution constantly in addition is so Zn2+ content constantly increases positive column solution thereby often go up positive charge.
The electron reduction H+ of positive column radiation generates H2 ↑ effusion.
Consume acid solution in the molten first zinc process; Two come the electron reduction hydrogen ion to generate hydrogen overflows, so acidity lowers pH value and slightly rises.
The cumulative volume of solution accounts for 1/3 of whole plating bath in the electrolyzer, in the process that plating bath constantly circulates, has regulated the pH value of plating bath on the production line, and it is reached between the 1.5-2, has avoided the harm of low excessively pH value and has increased the negative interaction that electric current causes.
In sum, on plating-roller coat continuous and automatic production line, increase an electrolyzer, can not only remove deleterious metallic impurity, increase molten zinc speed simultaneously, especially suitably promoted pH value, increased the overpotential of hydrogen, reduced hydrogen evolution phenomenon, refinement coating, reduced power consumption, avoided in the production process, because acidity is excessive, pH value is low excessively, and causes the corrosion of zinc coating, thereby has greatly promoted quality product.
Claims (3)
1. control and promote the processing method of plating bath pH value on roll bending galvanizing-roller coat continuous and automatic production line of anti-the fingerprint, the plating bath that is rich in zine ion enters plating tank by molten zinc groove, it is characterized in that: after plating bath is introduced into electrolyzer by molten zinc groove, enter circulation groove again through filter on the line, enter plating tank by circulation groove again, the plating bath in the plating tank is got back to electrolyzer by circulation groove; Plating bath in electrolyzer with the current density electrolysis of 0.1-0.3A/dm2.
2. control and promote the device of plating bath pH value on roll bending galvanizing-roller coat continuous and automatic production line of anti-the fingerprint, it is characterized in that: described device is the electrolyzer in the method according to claim 1, be provided with zinc matter anode and irony negative electrode in the electrolyzer, be arranged in power supply respectively; Electrolyzer be provided with pipeline by filter on the line after the communication loop groove, circulation groove also is provided with pipeline and is communicated with plating tank, molten zinc groove has pipeline to be communicated with electrolyzer.
3. the device of control and lifting plating bath pH value on roll bending galvanizing-roller coat continuous and automatic production line of anti-fingerprint the as claimed in claim 2, it is characterized in that: three anodes are set in the electrolyzer at interval, two negative electrodes, structure is: anode-cathode-anode-cathode-anode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101519608A CN101397691B (en) | 2007-09-24 | 2007-09-24 | Apparatus and technology for controlling and improving plating solution PH value on fingerprint resistant production chain |
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| CN2007101519608A CN101397691B (en) | 2007-09-24 | 2007-09-24 | Apparatus and technology for controlling and improving plating solution PH value on fingerprint resistant production chain |
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| CN101397691A CN101397691A (en) | 2009-04-01 |
| CN101397691B true CN101397691B (en) | 2010-09-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102776534A (en) * | 2012-04-24 | 2012-11-14 | 长江润发(江苏)薄板镀层有限公司 | Water treatment process of fingerprint resistant plate |
| CN103510141B (en) * | 2012-06-20 | 2016-01-20 | 五冶集团上海有限公司 | A kind of method improving electro-galvanizing multi-layer device setting accuracy |
| CN104894633A (en) * | 2015-05-22 | 2015-09-09 | 北京中冶设备研究设计总院有限公司 | Continuous nickel electroplating solution supply device |
| CN104947173A (en) * | 2015-05-22 | 2015-09-30 | 北京中冶设备研究设计总院有限公司 | Device and method for improving pH value of continuous electronickelling solution |
| CN105442024A (en) * | 2015-12-30 | 2016-03-30 | 桂林斯壮微电子有限责任公司 | Automatic chemical liquid adding system |
| CN106048702A (en) * | 2016-07-18 | 2016-10-26 | 江门市河正环保设备有限公司 | Electroplating device |
| CN105999826A (en) * | 2016-07-18 | 2016-10-12 | 江门市河正环保设备有限公司 | Electrolytic filter |
| CN107313107A (en) * | 2017-06-29 | 2017-11-03 | 十堰市协兴工贸有限公司 | A kind of molten zinc technology method outside line |
| CN110453273B (en) * | 2019-09-25 | 2021-07-13 | 嘉兴市金鹰新材料股份有限公司 | Short-distance zinc liquid electroplating assembly line |
| CN110983381B (en) * | 2019-12-26 | 2021-02-09 | 有研亿金新材料有限公司 | Method for preparing superfine tungsten powder by electrolyzing ammonium tungstate solution |
| CN112160017A (en) * | 2020-10-23 | 2021-01-01 | 江苏九天光电科技有限公司 | A continuous purification device for plating solution |
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| CN1865517A (en) * | 2006-03-31 | 2006-11-22 | 江苏华达涂层有限公司 | Process for preparing cyanide-free alkaline zinc-electroplating anti-fingerprint rolled board |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1865517A (en) * | 2006-03-31 | 2006-11-22 | 江苏华达涂层有限公司 | Process for preparing cyanide-free alkaline zinc-electroplating anti-fingerprint rolled board |
Non-Patent Citations (4)
| Title |
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| JP昭57-29600A 1982.02.17 |
| JP昭58-93899A 1983.06.03 |
| 陈义庆等.涂镀钢铁产品发展近况.鞍钢技术 3.2006,(3),14-19. |
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Application publication date: 20090401 Assignee: CHANGJIANG RUNFA (JIANGSU) THIN PLATE COATING Co.,Ltd. Assignor: Changjiang Runfa Group Co.,Ltd.|Jiangsu Huada Coating Co.,Ltd. Contract record no.: 2013320000685 Denomination of invention: Apparatus and technology for controlling and improving plating solution PH value on fingerprint resistant production chain Granted publication date: 20100929 License type: Exclusive License Record date: 20130910 |
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Effective date of registration: 20170222 Address after: Suqian City, Jiangsu province 223800 Emei Suyu District Road No. 98 Patentee after: CHANGJIANG RUNFA (JIANGSU) THIN PLATE COATING Co.,Ltd. Address before: Changjiang Road 215633 in Jiangsu province Zhangjiagang City gold town, No. 98 Patentee before: Changjiang Runfa Group Co.,Ltd. Patentee before: Jiangsu Huada Coating Co.,Ltd. |
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Granted publication date: 20100929 |
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