CN105088298A - Composite electroplating bath for electroplating of cold rolling thin strip steel surface and electroplating section of composite electroplating bath - Google Patents
Composite electroplating bath for electroplating of cold rolling thin strip steel surface and electroplating section of composite electroplating bath Download PDFInfo
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- CN105088298A CN105088298A CN201410217651.6A CN201410217651A CN105088298A CN 105088298 A CN105088298 A CN 105088298A CN 201410217651 A CN201410217651 A CN 201410217651A CN 105088298 A CN105088298 A CN 105088298A
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Abstract
The invention relates to a composite electroplating bath for electroplating of a cold rolling thin strip steel surface and an electroplating section of the composite electroplating bath. The composite electroplating bath comprises anode plates, conduction rollers, drying rollers, a sinking roller and an electroplating power system, all of which are borne in electroplating bath bodies. The anode plates, the conduction rollers and the drying rollers in electroplating areas of the single composite electroplating bath bodies are arranged to be four sections, wherein the first electroplating area and the fourth electroplating area are horizontally arranged, and the second electroplating area and the third electroplating area are vertically arranged. The two conduction rollers and one sinking roller are arranged, the wrap angle of the conduction rollers and the wrap angle of cold rolling thin strip steel are both 90 degrees, and the two conduction rollers make contact with the lower surface of the cold rolling thin strip steel. The wrap angle of the sinking roller and the wrap angle of the strip steel are both 180 degrees, and the sinking roller makes contact with the upper surface of the cold rolling thin strip steel. The power system comprises two electroplating power sources, wherein the first electroplating power source supplies power to the first electroplating area and the second electroplating area, and the second power source supplies power to the third electroplating area and the fourth electroplating area. The composite electroplating bath is suitable for producing electroplating layers with higher quality, economic efficiency is higher, and maintaining is easier.
Description
Technical field
The present invention relates to a kind of electroplanting device for thin strip cold electroplating surface, relate to a kind of plating tank for thin strip cold electroplating surface specifically.
Background technology
Current, the continuous electroplating unit used in industrial circle, such as Thin Strip Steel surface continuous electroplating zinc unit, its plating Duan Jun realizing plating function is connected in series by several plating tanks and forms.Different according to the orientation of electroplating region in plating tank, there are horizontal electroplating bath and rectilinear plating tank two kinds.Figure 1 shows that and Figure 2 shows that the arrangement that multiple (m) rectilinear plating tank is serially connected by the arrangement that multiple (n) horizontal electroplating bath is serially connected.
As shown in Figure 1, the scope of single horizontal coating bath is part shown in " coating bath 101 " in figure, comprise conductive rollers 2, positive plate 4, electroplating power supply 5, conductive rollers 2 is placed in the top of band steel 1, cold rolled strip 1 is clamped between conductive rollers 2 and rubber faced roll 3 and runs continuously, rubber faced roll 2 plays a part support belt steel 1 to be made it to be adjacent to conductive rollers 2, also referred to as support roll, conductive rollers 2 is connected to the negative pole of electroplating power supply 5 by busbar, positive plate 4 is connected to the positive pole of electroplating power supply 5 by busbar, band steel 1 contacts with conductive rollers 2, become equipotential system, thus, anode 4 with steel 1 and pairing forms upper and lower surface electroplating region, complete the plating that band steel two is surperficial.
As shown in Figure 2, the scope of single rectilinear horizontal coating bath is part shown in diagram " coating bath 10 ' 1 ", comprise conductive rollers 2, positive plate 4, electroplating power supply 5, conductive rollers 2 is placed in the below of band steel 1, cold rolled strip 1 runs continuously around conductive rollers 2 and rubber faced roll 3, rubber faced roll 3 plays band steel steering-effecting, also referred to as sinking roller, squeezing roller 6 is provided with in conductive rollers 2 times both sides, be brought in conductive rollers in order to avoid the plating solution of electroplating region with band steel, conductive rollers 2 is connected to the negative pole of electroplating power supply 5 by busbar, positive plate 4 is connected to the positive pole of electroplating power supply 5 by busbar, band steel 1 contacts with conductive rollers 2, become equipotential system, thus, anode 4 with steel 1 and pairing forms upper and lower surface electroplating region, complete the plating that band steel two is surperficial.
The coating bath of the above-mentioned two kinds of existing coating baths of comprehensive analysis, its relative merits are as follows:
The advantage of horizontal coating bath has: compact construction, and occupation of land space is little, and maintenance of the equipment is relatively easy; Shortcoming has: as shown in Figure 1, and conductive rollers 2 is linear contact with band steel 1, is namely 0 ° of cornerite in theory, and the flow area that the electroplating current of " conductive rollers → band steel " transmits is little, and roll surface is easily burnt; Without squeezing roller between conductive rollers 2 and electroplating region, conductive rollers directly contacts with plating solution, and due to conductive rollers and electroplating region closer, the characteristic of " negative electrode " that conductive rollers has, conduction roll surface is also had " deposition zinc ", " deposition zinc " of roll surface must remove in time, otherwise the quality of the direct influence zone steel overlay coating of meeting.In order to remove this " deposition zinc ", need configuration conductive rollers roll surface device for scraping on the one hand, mechanical system is scraped prune " deposition zinc ", on the other hand, also " deposition zinc " that do not remove by mechanical scraping dissolving will be gone by electroplate liquid.The former causes conductive rollers can only be placed on band steel, otherwise roll surface device for scraping is without installing space, and the latter causes can not arranging squeezing roller between conductive rollers and electroplating region, otherwise can not realize plating solution and " deposition zinc " of roll surface is dissolved the object of going.Meanwhile, in order to dissolve quickly " deposition zinc " of removing conductive rollers roll surface, little (being about 1) of the pH value selection of electroplate liquid, also namely the acidity of plating solution is strong, and this also causes plating tank region to touch the early stage corrosion damage of liquid equipment.The features of above-mentioned conductive rollers causes conductive rollers roll surface state-retention capabilities weak, and it is short that conductive rollers single uses on the machine the cycle, is generally 15-20 days, and machine will be descended afterwards to re-start roll surface grinding, and conductive rollers use cost is high.
The advantage of rectilinear coating bath has: as shown in Figure 2, and the cornerite of conductive rollers 2 and band steel 1 is 180 °, and the flow area that the electroplating current of " conductive rollers → band steel " transmits is large, and roll surface is not easily burnt; Conductive rollers 2 is placed in below band steel 1, strip surface quality easily controls, conductive rollers 2 and electroplating region distance are greatly, squeezing roller is provided with between conductive rollers 2 and electroplating region, thus conductive rollers 2 does not directly contact with plating solution, do not have " deposition zinc ", conductive rollers roll surface state easily ensures, conductive rollers single uses on the machine the time can be very long.In addition, because conductive rollers 2 plating solution of getting along well directly contacts, device for scraping machinery except conductive rollers is removed because except the roll surface " sticky zinc " of the relatively sliding generation between conductive rollers and coating band steel, also be equipped with independently roll surface dilute sulphuric acid cleaning system in addition, thus the pH value of coating bath electroplate liquid is selected, compared with horizontal coating bath, can be more greatly, also namely compared to horizontal coating bath, the corrodibility of rectilinear coating bath electroplate liquid is low, also will be lighter than horizontal electroplating bath to the corrosion of tactile liquid equipment.Shortcoming has: when several rectilinear coating bath serial connections, as shown in Figure 2, in unit space, equipment is intensive, the maintenance of equipment is caused to become very difficult, such as, conductive rollers and band ladle angle are 180 °, and conductive rollers roll surface device for scraping can only be arranged on the side-lower of conductive rollers, cause actual use difficulty, inconvenience;
Chinese invention patent " CN201010120245.X " discloses a kind of static-pressure horizontal electroplating bath, be made up of upper frame, underframe, lower anode, Anodic, liquid barrier, conductive rollers, support roll, side cover and automatic tracking system, in the middle part of plating tank between I and F electroplating region, be configured with static pressure chamber and upper static pressure chamber under bicavate; The plating solution inputting upper and lower static pressure chamber sprays into I and F electroplating region by the gap level between band steel and chamber, upper and lower static pressure chamber head.This invention is the improving technology scheme on the basis of existing level formula plating tank, still has the shortcomings of existing level formula plating tank.
Summary of the invention
The object of this invention is to provide a kind of Combined type electric coating bath for cold-rolled thin steel strip electroplating surface and plating section thereof, can when selecting the plating tank of multi-pass, avoid the shortcoming of existing pure water flat coating bath and existing pure rectilinear coating bath and merge its advantage, thus being applicable to produce more high quality coating; And economy is higher and more easy care.
A kind of Combined type electric coating bath for cold-rolled thin steel strip electroplating surface is provided according to an aspect of the present invention, comprise the positive plate, conductive rollers, squeezing roller, sinking roller and the electroplating power supply system that are carried on plating tank cell body, positive plate in the electroplating region of single Combined type electric coating bath, conductive rollers, squeezing roller are arranged to four sections, wherein first paragraph and the 4th section of electroplating region horizontally disposed, second segment and the 3rd section of electroplating region are in being arranged vertically.
The length of horizontally disposed each positive plate is identical, and the length of vertically arranged each positive plate is identical.
Horizontally disposed positive plate is (0.5 ~ 1) with the length ratio being arranged vertically positive plate: 1.
Single Combined type electric coating bath comprises two conductive rollers and a sinking roller, the cornerite of conductive rollers and cold-rolled thin steel strip is 90 °, two conductive rollers all contact with the lower surface of cold-rolled thin steel strip, and the cornerite of sinking roller and band steel is 180 °, and sinking roller contacts with the upper surface of cold-rolled thin steel strip.
Power-supply system comprises two electroplating power supplies, and first electroplating power supply is powered to first paragraph and second segment electroplating region, and second electroplating power supply is powered to the 3rd section and the 4th section of electroplating region.
Wherein, first conductive rollers is the common cathode of first paragraph and second segment electroplating region, and second conductive rollers is the common cathode of the 3rd section and the 4th section electroplating region.
Single Combined type electric coating bath comprises four pairs of squeezing rollers, and a pair squeezing roller is arranged in the front and back of every root conductive rollers, wherein, extracts function a pair for horizontal section strip steel, extracts function a pair for vertical section strip steel.
Thering is provided a kind of plating section for cold-rolled thin steel strip surface continuously plating product line according to a further aspect of the invention, is be connected in series by multiple above-mentioned single Combined type electric coating bath to form.
Combined type electric coating bath for cold-rolled thin steel strip electroplating surface of the present invention has the advantage of horizontal coating bath and rectilinear coating bath concurrently, and abandons the shortcoming of the two.Wherein conductive rollers is that 90 ° of cornerites contact with band steel, although do not have 180 ° of cornerites of rectilinear plating large, the cornerite of 90 ° is also enough large, and the flow area that the electroplating current of " conductive rollers → band steel " transmits is large, roll surface is not easily burnt, and this is the advantage that horizontal coating bath does not have; Squeezing roller is configured with between the electroplating region of conductive rollers and horizontal section and vertical section, thus conductive rollers does not directly contact with plating solution, do not have " deposition zinc ", conductive rollers roll surface state easily ensures, conductive rollers single uses on the machine the time can be very long, and this is also the advantage that horizontal coating bath does not have; Because conductive rollers discord plating solution directly contacts, device for scraping machinery except conductive rollers is removed except a small amount of roll surface " sticky zinc ", also be equipped with roll surface dilute sulphuric acid washing unit in addition, thus the pH value of coating bath electroplate liquid is selected compared with horizontal coating bath, can be more greatly, also namely compared to horizontal coating bath, the corrodibility of Combined type electric coating bath electroplate liquid is low, also will be lighter than horizontal electroplating bath to the corrosion of tactile liquid equipment.In addition, Combined type electric coating bath does not have the shortcoming of rectilinear coating bath, i.e. Combined type electric coating bath space relative loose, larger space is had between groove and groove, easy maintenance, the installing space of conductive rollers roll surface scraper device is also greater than rectilinear plating tank, and device for scraping can optimal design-aside, give full play to its performance, improve the life-span on probation of conductive rollers and the surface quality of coating further.
Accompanying drawing explanation
Fig. 1 is that n horizontal electroplating bath serial connection of prior art arranges schematic diagram;
Fig. 2 is that m rectilinear plating tank serial connection of prior art arranges schematic diagram;
Fig. 3 is that the single Combined type electric coating bath serial connection of the Combined type electric coating bath for cold-rolled thin steel strip electroplating surface of one embodiment of the invention arranges schematic diagram;
Fig. 4 is k Combined type electric coating bath serial connection layout schematic diagram embodiment illustrated in fig. 3.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.First it should be noted that, the present invention is not limited to following embodiment, and the spirit that those skilled in the art should embody from following embodiment is to understand the present invention, and each technical term can do the most wide in range understanding based on spirit of the present invention.Reference numeral identical in the accompanying drawings represents identical part.
As shown in Figure 3, the single Combined type electric coating bath 10 for cold-rolled thin steel strip electroplating surface of one embodiment of the invention "; comprise the positive plate 4, conductive rollers 2, squeezing roller 6, sinking roller 3 and the electroplating power supply system (sign) that are carried on plating tank cell body (not shown); the positive plate 4 in the electroplating region of single Combined type electric coating bath, conductive rollers 2, squeezing roller 3 are arranged to four sections; as shown in the figure wherein first paragraph and the 4th section of electroplating region horizontally disposed, second segment and the 3rd section of electroplating region are in being arranged vertically.The length of horizontally disposed each positive plate 4 is identical, and the length of vertically arranged each positive plate 4 is also identical.Horizontally disposed positive plate is (0.5 ~ 1) with the length ratio being arranged vertically positive plate: 1.In the present embodiment, single Combined type electric coating bath 10 " comprise two conductive rollers 2 and a sinking roller 3; conductive rollers 2 is 90 ° with the cornerite of cold-rolled thin steel strip 1; two conductive rollers namely as shown in the figure left and right conductive rollers 2,2 all contact with the lower surface of cold-rolled thin steel strip 1; sinking roller 3 and be with the cornerite of steel 1 to be 180 °, sinking roller 3 contacts with the upper surface of cold-rolled thin steel strip 1.Single Combined type electric coating bath 10 " comprise four pairs of squeezing rollers 6, a pair squeezing roller 6 is arranged in the front and back of every root conductive rollers 2, wherein, extracts function a pair for horizontal section strip steel 1, extracts function a pair for vertical section strip steel 1.
Single Combined type electric coating bath 10 " be equipped with two electroplating power supplies 5,5; and first electroplating power supply is powered to first paragraph and second segment electroplating region; second electroplating power supply is powered to the 3rd section and the 4th section of electroplating region; wherein; first conductive rollers and left conductive rollers 2 are common cathode of first paragraph and second segment electroplating region, second conductive rollers and right conductive rollers 2 are common cathode of the 3rd section and the 4th section electroplating region.
Adopt the single Combined type electric coating bath 10 for cold-rolled thin steel strip electroplating surface of multiple above-described embodiment "; comprise plating tank 10 as shown in Figure 4 " 1, plating tank 10 " 2 ... k-1, plating tank 10 " k by compose in series for cold-rolled thin steel strip surface continuously plating product line plating section.
Below an embody rule example is enumerated further so that the specific implementation process of above-described embodiment to be described.
A continuous Thin Strip Steel surface galvanizing production line have employed technical scheme of the present invention, and totally 6 Combined type electric coating bath serial connections form, and see Fig. 4, namely in Fig. 4, k is chosen as 6.The specification of the band steel produced is: thickness: 1.0 ~ 2.5mm, width: 800 ~ 1550mm, and production line top speed is 150m/min, double side zinc coating, and one side zinc coating layer maximum ga(u)ge is 90g/m2.As follows according to the configuration of the single composite plating bath of the present invention's this production line determined plating section:
1, see Fig. 3, single Combined type electric coating bath 10 " comprise positive plate 4, conductive rollers 2, sinking roller 3, squeezing roller 6; and carry the plating tank cell body of above-mentioned mechanical means, electroplating power supply systems etc., the electroplating region of single Combined type electric coating bath is divided into four sections; two sections are horizontally disposed, and two sections are arranged vertically.Wherein, the diameter of conductive rollers 2 and sinking roller 3 is 1000mm.
2, see Fig. 3, single Combined type electric coating bath 10 " first paragraph and the 4th section of electroplating region be horizontally disposed, and the length of the positive plate of the two is equal, is 600mm, and second segment and the 3rd section of electroplating region are in being arranged vertically, and the length of the positive plate of the two is equal, is 900mm; The two length is than being 0.67:1;
3, single Combined type electric coating bath 10 " comprise two conductive rollers 2 and a sinking roller 3; and the cornerite of conductive rollers 2 and cold-rolled thin steel strip 1 is 90 °; two conductive rollers 2,2 all contact with the lower surface of cold-rolled thin steel strip 1; cornerite of sinking roller 3 and band steel 1 is 180 °, and sinking roller 3 contacts with the upper surface of cold-rolled thin steel strip 1;
4, see Fig. 3, single Combined type electric coating bath 10 " comprise four pairs of squeezing rollers 6; and squeezing roller diameter is 200mm, and a pair squeezing roller 6 is arranged in the front and back of every root conductive rollers 2, wherein; extract function for horizontal section strip steel a pair, extracts function a pair for vertical section strip steel;
5, see Fig. 3, single Combined type electric coating bath 10 " be equipped with two electroplating power supplies 5,5; and maximum current capability is 20KA, and voltage is 20V, and first electroplating power supply 5 powers to first paragraph and second segment electroplating region; second electroplating power supply 5 is powered to the 3rd section and the 4th section of electroplating region; wherein, first conductive rollers 2 is common cathode of first paragraph and second segment electroplating region, and second conductive rollers 2 is common cathode of the 3rd section and the 4th section electroplating region.
By comparative illustration hereafter, composite plating bath is not the simple superposition of horizontal coating bath and vertical coating bath, but combines the advantage of the two more dexterously, has abandoned the shortcoming of original coating bath as much as possible simultaneously.
The contrast of three kinds of coating baths
In sum, Combined type electric coating bath has the advantage of horizontal coating bath and rectilinear coating bath concurrently, and abandons the shortcoming of the two, has positive effect, is specifically summarized as follows:
Combined type coating bath, first has the plurality of advantages of rectilinear plating tank:
Combined type electric coating bath, conductive rollers 2 is that 90 ° of cornerites contact with band steel 1, although do not have 180 of rectilinear plating ° of cornerites large, but the cornerite of 90 ° is also enough large, the flow area that the electroplating current of " conductive rollers → band steel " transmits is large, roll surface is not easily burnt, and this is the advantage that horizontal coating bath does not have;
In Combined type electric coating bath, squeezing roller 6 is configured with between the electroplating region of conductive rollers 2 and horizontal section and vertical section, thus conductive rollers 2 does not directly contact with plating solution, do not have " deposition zinc ", conductive rollers roll surface state easily ensures, conductive rollers single uses on the machine the time can be very long, and this is also the advantage that horizontal coating bath does not have.
In Combined type electric coating bath, because conductive rollers 2 plating solution of getting along well directly contacts, device for scraping machinery except conductive rollers is removed except a small amount of roll surface " sticky zinc ", also be equipped with roll surface dilute sulphuric acid washing unit in addition, thus the pH value of coating bath electroplate liquid is selected, and compares with horizontal coating bath, can be more greatly, also namely compared to horizontal coating bath, the corrodibility of Combined type electric coating bath electroplate liquid is low, also will be lighter than horizontal electroplating bath to the corrosion of tactile liquid equipment.
Combined type electric coating bath, there is no the shortcoming of rectilinear coating bath, i.e. Combined type electric coating bath space relative loose, see Fig. 4, have larger space between groove and groove, easily overhaul, the installing space of conductive rollers roll surface scraper device is also greater than rectilinear plating tank, device for scraping can optimal design-aside, gives full play to its performance, improves the life-span on probation of conductive rollers and the surface quality of coating further.
The Electro-galvanizing Production Line of combined type coating bath of the present invention has merged the advantage of horizontal and rectilinear coating bath thus, abandoned simultaneously the two shortcoming, be applicable to produce more high quality coating, the economy of coating bath is higher, more easy care.
Should be understood that those skilled in the art can make various changes or modifications the present invention after having read above-mentioned teachings of the present invention, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (8)
1. the Combined type electric coating bath for cold-rolled thin steel strip electroplating surface, comprise the positive plate, conductive rollers, squeezing roller, sinking roller and the electroplating power supply system that are carried on plating tank cell body, it is characterized in that, positive plate in the electroplating region of single Combined type electric coating bath, conductive rollers, squeezing roller are arranged to four sections, wherein first paragraph and the 4th section of electroplating region horizontally disposed, second segment and the 3rd section of electroplating region are in being arranged vertically.
2. the Combined type electric coating bath for cold-rolled thin steel strip electroplating surface according to claim 1, is characterized in that, the length of horizontally disposed each positive plate is identical, and the length of vertically arranged each positive plate is identical.
3. the Combined type electric coating bath for cold-rolled thin steel strip electroplating surface according to claim 2, is characterized in that, horizontally disposed positive plate is (0.5 ~ 1) with the length ratio being arranged vertically positive plate: 1.
4. the Combined type electric coating bath for cold-rolled thin steel strip electroplating surface according to claim 1, it is characterized in that, single Combined type electric coating bath comprises two conductive rollers and a sinking roller, the cornerite of conductive rollers and cold-rolled thin steel strip is 90 °, two conductive rollers all contact with the lower surface of cold-rolled thin steel strip, the cornerite of sinking roller and band steel is 180 °, and sinking roller contacts with the upper surface of cold-rolled thin steel strip.
5. the Combined type electric coating bath for cold-rolled thin steel strip electroplating surface according to claim 1, it is characterized in that, power-supply system comprises two electroplating power supplies, and first electroplating power supply is powered to first paragraph and second segment electroplating region, and second electroplating power supply is powered to the 3rd section and the 4th section of electroplating region.
6. the Combined type electric coating bath for cold-rolled thin steel strip electroplating surface according to claim 4, it is characterized in that, power-supply system comprises two electroplating power supplies, and first electroplating power supply is powered to first paragraph and second segment electroplating region, and second electroplating power supply is powered to the 3rd section and the 4th section of electroplating region; Wherein first conductive rollers is the common cathode of first paragraph and second segment electroplating region, and second conductive rollers is the common cathode of the 3rd section and the 4th section electroplating region.
7. the Combined type electric coating bath for cold-rolled thin steel strip electroplating surface according to claim 1 or 4, it is characterized in that, single Combined type electric coating bath comprises four pairs of squeezing rollers, a pair squeezing roller is arranged in the front and back of every root conductive rollers, wherein, extract function for horizontal section strip steel a pair, extract function for vertical section strip steel a pair.
8. for a plating section for cold-rolled thin steel strip surface continuously plating product line, it is characterized in that, is be connected in series by multiple single Combined type electric coating bath as described in any one of claim 1 to 7 to form.
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| CN201410217651.6A CN105088298A (en) | 2014-05-20 | 2014-05-20 | Composite electroplating bath for electroplating of cold rolling thin strip steel surface and electroplating section of composite electroplating bath |
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| CN201410217651.6A CN105088298A (en) | 2014-05-20 | 2014-05-20 | Composite electroplating bath for electroplating of cold rolling thin strip steel surface and electroplating section of composite electroplating bath |
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| CN106119937A (en) * | 2016-08-21 | 2016-11-16 | 无锡瑾宸表面处理有限公司 | The special electroplated discs of plating line |
| CN106917134A (en) * | 2015-12-24 | 2017-07-04 | Posco公司 | The electroplanting device and method of Fe Ni systems alloying metal paper tinsel |
| CN112680773A (en) * | 2020-12-17 | 2021-04-20 | 中国二十冶集团有限公司 | Dismounting, updating and reforming method for electroplating bath of electrotinning unit |
| WO2021164474A1 (en) * | 2020-02-20 | 2021-08-26 | 深圳市海瀚新能源技术有限公司 | Coating conductive device, coating system and coating method for conductive film |
| CN116083981A (en) * | 2023-02-13 | 2023-05-09 | 北京依蓝能源科技有限公司 | Continuous stainless steel-carbon steel electrogalvanized composite plate and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106917134A (en) * | 2015-12-24 | 2017-07-04 | Posco公司 | The electroplanting device and method of Fe Ni systems alloying metal paper tinsel |
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| CN112680773A (en) * | 2020-12-17 | 2021-04-20 | 中国二十冶集团有限公司 | Dismounting, updating and reforming method for electroplating bath of electrotinning unit |
| CN116083981A (en) * | 2023-02-13 | 2023-05-09 | 北京依蓝能源科技有限公司 | Continuous stainless steel-carbon steel electrogalvanized composite plate and preparation method thereof |
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Application publication date: 20151125 |