CN116083981A - Continuous stainless steel-carbon steel electrogalvanized composite plate and preparation method thereof - Google Patents
Continuous stainless steel-carbon steel electrogalvanized composite plate and preparation method thereof Download PDFInfo
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- CN116083981A CN116083981A CN202310158582.5A CN202310158582A CN116083981A CN 116083981 A CN116083981 A CN 116083981A CN 202310158582 A CN202310158582 A CN 202310158582A CN 116083981 A CN116083981 A CN 116083981A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a continuous stainless steel-carbon steel electrogalvanized composite plate and a preparation method thereof, belonging to the technical field of stainless steel composite plate preparation, wherein the preparation method comprises the following steps: obtaining a cold-rolled stainless steel-carbon steel single-sided composite board; cleaning the cold-rolled stainless steel-carbon steel single-sided composite board to obtain a cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized; performing single-sided electrogalvanizing on the surface of the carbon steel side of the cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized by adopting a horizontal plating tank, and then performing chromium-free passivation, drying, cold film coating and coiling to obtain a continuous stainless steel-carbon steel electrogalvanizing composite board; any one of the upper anode and the lower anode in the horizontal plating tank is electrified, the other anode is not electrified or is not provided with an anode, and the technical problems that the carbon steel side of the stainless steel single-sided composite plate is not corrosion-resistant and the zinc liquid is inevitably sprayed on the stainless steel surface in the single-sided hot galvanizing process of the carbon steel side are solved.
Description
Technical Field
The invention relates to the technical field of stainless steel composite board preparation, in particular to a continuous stainless steel-carbon steel electrogalvanized composite board and a preparation method thereof.
Background
The stainless steel composite board can replace a pure stainless steel plate, so that the equipment cost can be reduced, and the use of the equipment is not affected by the stainless steel composite board. The stainless steel composite plate can be used for desulfurizing towers, ammonia distillation towers, benzene removal towers and the like, and has low cost and corrosion resistance; the stainless steel composite board can also be used in the field of decoration, and the cost can be reduced to more than 30% by adopting the stainless steel composite board to replace a pure stainless steel plate.
The existing stainless steel composite plate is produced by adopting a carbon steel explosion/hot rolling composite coating double-sided stainless steel method, as shown in figure 1, but the double sides are both stainless steel layers, so that the use cost is high.
Production of stainless steel-carbon steel single-sided composite boards is attempted to adopt a single-sided hot galvanizing production method, but in the hot galvanizing process, the technical problem that zinc liquid splashes on one side of the stainless steel is difficult to solve, so that the product quality is affected. Specifically, the strip steel with single-sided continuous hot dip galvanizing is reformed by adopting the existing double-sided hot dip galvanizing unit and passes above the liquid level of a zinc pot molten pool and is supported by a guide roller. The galvanized roller is directly immersed in the molten pool of the zinc pot. The distance between the galvanized roller and the strip steel is regulated to be a few millimeters, so that the galvanized roller and the strip steel reversely rotate, and the lower surface of the strip steel is galvanized. In the single-sided continuous hot galvanizing process of the carbon steel side, a small amount of zinc liquid is inevitably carried up to splash to one side of the stainless steel side, so that the quality of the plate surface is damaged, and the quality of the product is difficult to stabilize. The domestic manufacturers try to reform single-sided continuous hot galvanizing by adopting the existing double-sided hot galvanizing unit, and the improvement of single-sided continuous hot galvanizing is unsuccessful. And a method of coating one side of the strip steel with a material which does not infiltrate with zinc and then hot galvanizing is adopted, so that a single-sided galvanized plate is obtained. However, this process is cumbersome and it is difficult to obtain a single-sided galvanized sheet.
The stainless steel-carbon steel single-sided composite board is produced by adopting a method of bonding a stainless steel-carbon steel polymer layer, and the problems of deformation and cracking in the welding and bending processes are difficult to solve, as shown in figure 2.
Disclosure of Invention
The invention aims to provide a continuous stainless steel-carbon steel electrogalvanized composite board and a preparation method thereof, which are used for solving the technical problems that the carbon steel side of a stainless steel single-sided composite board is not corrosion-resistant and zinc liquid is inevitably splashed on the stainless steel surface in the single-sided hot galvanizing process of the carbon steel side.
In a first aspect, embodiments of the present application provide a method for preparing a continuous stainless steel-carbon steel electrogalvanized composite plate, the method comprising:
obtaining a cold-rolled stainless steel-carbon steel single-sided composite board;
cleaning the cold-rolled stainless steel-carbon steel single-sided composite board to obtain a cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized;
performing single-sided electrogalvanizing on the surface of the carbon steel side of the cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized by adopting a horizontal plating tank, and then performing chromium-free passivation, drying, cold film coating and coiling to obtain a continuous stainless steel-carbon steel electrogalvanizing composite board;
wherein any one of the upper anode and the lower anode in the horizontal plating tank is electrified, and the other anode is not electrified or is not provided with an anode.
Further, an insoluble anode is arranged at the upper part of the horizontal plating tank, and an insulating material is arranged at the lower part of the horizontal plating tank.
Further, when the surface of the carbon steel side of the cold rolled stainless steel-carbon steel single-sided composite board to be galvanized is subjected to single-sided electrogalvanizing by adopting a horizontal plating tank, the electroplated layer is pure zinc Zn; the thickness of the coating is 20/20g/m 2 The current density is more than 85A/dm 2 。
Further, when the surface of the cold rolled stainless steel-carbon steel single-sided composite plate to be galvanized is subjected to single-sided electrogalvanizing by adopting a horizontal plating tank, the movement speed of the strip steel serving as a cathode is 85-95 m/min.
Further, when the surface of the carbon steel side of the cold rolled stainless steel-carbon steel single-sided composite board to be galvanized is subjected to single-sided electrogalvanizing by adopting a horizontal plating tank, a zinc sulfate solution is adopted as an electroplating solution, the concentration is 340-360 g/l, no additive is added, and the temperature is 60-70 ℃.
Further, when the surface of the carbon steel side of the cold rolled stainless steel-carbon steel single-sided composite board to be galvanized is subjected to single-sided electrogalvanizing by adopting a horizontal plating tank, a zinc sulfate solution is adopted as a plating solution, the concentration is 350g/l, no additive is added, and the temperature is 65 ℃.
Further, when the surface of the carbon steel side of the cold rolled stainless steel-carbon steel single-sided composite board to be galvanized is subjected to single-sided electrogalvanizing by adopting a horizontal plating tank, the carbon steel side of the stainless steel-carbon steel single-sided composite board is the upper surface of the horizontal movement, and the stainless steel side is the lower surface.
Further, the step of cleaning the cold-rolled stainless steel-carbon steel single-sided composite board to obtain the cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized comprises the following steps:
and sequentially unwinding, alkaline washing, electrolytic cleaning, brushing, pickling and rinsing the cold-rolled stainless steel-carbon steel single-sided composite plate to obtain the cold-rolled stainless steel-carbon steel single-sided composite plate to be galvanized.
In a second aspect, embodiments of the present application provide a continuous stainless steel-carbon steel electrogalvanized composite plate made by the method of making of the first aspect.
Further, the continuous stainless steel-carbon steel electrogalvanizing composite plate comprises a carbon steel base layer, wherein one surface of the carbon steel base layer is provided with a stainless steel layer, and the other surface of the carbon steel base layer is provided with an electrogalvanizing layer.
Compared with the prior art, the scheme provided by the embodiment of the application has at least the following beneficial effects:
compared with the conventional prior disclosed electrogalvanizing method, the single-sided continuous electrogalvanizing method adopts a horizontal electroplating bath, so that one anode of the upper anode and the lower anode is electrified, the other anode is not electrified or is not provided with the anode, thereby realizing single-sided electrogalvanizing, and solving the technical problems that the carbon steel side of the stainless steel single-sided composite plate is not corrosion-resistant and the zinc liquid is inevitably splashed on the stainless steel surface in the single-sided hot galvanizing process of the carbon steel side; meanwhile, the prepared composite board meets the requirements of GB/T8165-2008 of composite stainless steel plate and Steel band.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a conventional clad stainless steel-carbon steel composite plate.
Fig. 2 is a schematic structural view of a conventional stainless steel-carbon steel bonded composite panel.
FIG. 3 is a schematic illustration of a single sided electrogalvanizing process using a horizontal plating tank in accordance with the present invention.
FIG. 4 is a schematic structural view of a stainless steel-carbon steel single-sided electrogalvanized composite plate in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present invention will be described in detail with reference to specific examples.
The general idea of the technical scheme provided by the embodiment of the invention is as follows:
the embodiment of the application provides a preparation method of a continuous stainless steel-carbon steel electrogalvanized composite plate, which comprises the following steps:
obtaining a cold-rolled stainless steel-carbon steel single-sided composite board;
cleaning the cold-rolled stainless steel-carbon steel single-sided composite board to obtain a cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized;
performing single-sided electrogalvanizing on the surface of the carbon steel side of the cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized by adopting a horizontal plating tank, and then performing chromium-free passivation, drying, cold film coating and coiling to obtain a continuous stainless steel-carbon steel electrogalvanizing composite board;
wherein any one of the upper anode and the lower anode in the horizontal plating tank is electrified, and the other anode is not electrified or is not provided with an anode.
As shown in fig. 3, in comparison with the conventional prior art disclosed "electrogalvanizing" method, the "single-sided continuous electrogalvanizing" in the present invention employs a horizontal plating bath, so that one of the upper and lower anodes is electrified, and the other anode is not electrified or provided with an anode, thereby realizing single-sided electrogalvanizing. The strip steel used as the cathode is always in a state of high-speed movement (such as 90 m/min). Has the following characteristics:
the cathode current density is large and is more than 85A/dm 2 。
The working voltage is low, and the electricity-saving effect is obvious because the cathode-anode distance is smaller than 12 mm.
Due to the high-speed movement of the cathode and the large working current density, electroplating is completed in a short time, the structure of the plating layer is compact, the defects of the plating layer are few, and the corrosion resistance is high.
The horizontal plating tank consists of an anode, a conductive roller, a supporting roller and an edge cover, wherein the upper surface of the strip steel is a carbon steel side, and the lower surface of the strip steel is a stainless steel side. The edge cover is used for shielding the power line at the edge part and preventing the power line from jumping out of the stainless steel plate surface. The edge cover is controlled by a hydraulic servo control system and follows the strip steel to effectively eliminate edge thickening and power line jumping.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Example 1
The example provides a preparation method of a continuous stainless steel-carbon steel electrogalvanized composite plate, which comprises the following steps: cold rolling stainless steel-carbon steel single-sided composite board, uncoiling, alkali washing, electrolytic cleaning, rinsing (scrubbing), acid washing, rinsing, single-sided electrogalvanizing, chromium-free passivation, drying, cold film coating, coiling, packaging and warehousing. The specific process is as follows:
the cold-rolled stainless steel-carbon steel single-sided composite board is characterized in that a steel coil trolley supports and conveys a steel coil on a steel coil seat to an uncoiler. After the strip steel is welded, a metal surface degreasing agent (NaOH is more than 20%) is adopted in a cleaning section to pair the strip steelThe steel is subjected to alkaline washing and electrolytic washing, and the coulomb density is more than 11C/dm 2 And (3) removing residual oil, residual iron and residual carbon powder on the surface of the steel plate, spraying and brushing, and then enabling the strip steel to enter an electrolytic pickling tank to carry out electrolytic pickling on the strip steel. Is an acid washing method which accelerates the chemical reaction of metal in acid liquor by means of an externally applied potential. The electrolytic acid washing solution is H 2 SO 4 (50-70 g/l) and the temperature is 55-65 ℃. Reaction principle:
Fe 3 O 4 +4H 2 SO 4 ＝FeSO4+Fe 2 (SO4) 3 +4H 2 O
Fe2O 3 +3H 2 SO 4 ＝Fe 2 (SO4) 3 +3H 2 O
anode 40H-4 e- =2h 2 O+O 2 ↑
Cathode 2h++2e- =h 2 ↑
The electrolytic pickling tank is of a middle two-way horizontal jet structure, electrolytic current is direct current, and working current is more than 8C/dm 2 Coulomb control by the intermediate conductor method is adopted. The acid liquor is input from top to bottom in the middle of the working tank. Then the electrolytic cleaning areas are respectively sprayed through gaps between the nozzles and the strip steel, and the surface of the strip steel is subjected to electrolytic pickling to remove an oxide film on the surface of the strip steel so as to perform activation treatment. And (3) feeding the steel strip subjected to electrolytic pickling into a washing tank, and removing residual acid liquor on the surface of the steel strip through spray brushing.
The cleaned steel strip enters a horizontal electrogalvanizing tank, an insoluble anode is arranged at the upper part of the plating tank, and an insulating material is not arranged at the lower part of the plating tank. The side of the stainless steel-carbon steel single-sided composite board, which is the upper side of the horizontal movement, is the lower side, and the surface of the side of the carbon steel is subjected to single-sided electrogalvanizing. The electroplated layer is pure zinc Zn; the thickness of the coating is 20/20g/m 2 The current density is more than 90A/dm 2 Zinc sulphate (ZnSO) 4 ·7H 2 O) solution was used as the plating solution at a concentration of 350g/l and at a temperature of 65℃without additives.
A total of 8 electrogalvanizing tanks are arranged, and the electrogalvanizing tank is of a middle bidirectional horizontal jet type structure, and plating solution is input from top to bottom in the middle of the electrogalvanizing tank. And then spraying the electroplating areas into gaps between the nozzles and the strip steel respectively, and electroplating the upper and lower surfaces of the strip steel under the action of current. The insoluble anode is used, and the metal ions required for electroplating deposition are supplied from a zinc dissolving station. The plating solution leaving the plating tank flows back to the plating solution circulation tank through the reflux tank, and the working principle of the plating is as follows:
cathode Zn 2+ +2e-＝Zn↓2H + +2e-＝H 2 ↑
Anode 40H-4 e- =2h 2 O+O 2 ↑
In order to ensure the stability of production and product quality, a zinc dissolving station is arranged outside a main plant, a metal zinc strip (20 multiplied by 150 mm) is added into a zinc dissolving tank, and then a dilute sulfuric acid solution in a plating solution circulating tank is pumped into the zinc dissolving tank by a pump to perform the following reaction:
Zn+H 2 SO 4 ＝ZnSO 4 +H 2 ↑
preparation of Zinc sulfate (ZnSO4.7H) 2 O) plating baths continue to provide the desired zinc ions. The solution is recycled without discharge.
After the steel strip is galvanized, the surface plating solution is squeezed to dryness by the conductive roller and the supporting roller, and then the steel strip enters a water washing tank for spray washing. And removing the residual plating solution on the surface of the strip steel.
The surface of the steel strip after water washing is dried by hot air, and enters an immersion type sealing groove to carry out surface sealing treatment of a galvanized layer. The treatment solution is SWG-J6000 (Parka-semen Corp.) impregnated with chromium-free passivating agent at room temperature. After the surface treatment is finished, the steel strip enters an induction heating device to be dried, and the heating temperature is 80-120 ℃.
And after the surface of the steel belt is dried, naturally cooling to room temperature, rolling by a coiling machine, and packaging and warehousing after unloading by a crane.
The structural schematic diagram of the stainless steel-carbon steel single-sided electrogalvanized composite plate obtained in the example is shown in figure 4, and the composite plate obtained through detection meets the requirements of GB/T8165-2008 of composite steel plate and Steel strip of stainless steel.
Various embodiments of the present application may exist in a range format; it should be understood that the description in a range format is merely for convenience and brevity and should not be interpreted as a rigid limitation on the scope of the application. It is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In addition, in the description of the present application, the terms "include", "comprise", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (10)
1. A method for preparing a continuous stainless steel-carbon steel electrogalvanized composite plate, which is characterized by comprising the following steps:
obtaining a cold-rolled stainless steel-carbon steel single-sided composite board;
cleaning the cold-rolled stainless steel-carbon steel single-sided composite board to obtain a cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized;
performing single-sided electrogalvanizing on the surface of the carbon steel side of the cold-rolled stainless steel-carbon steel single-sided composite board to be galvanized by adopting a horizontal plating tank, and then performing chromium-free passivation, drying, cold film coating and coiling to obtain a continuous stainless steel-carbon steel electrogalvanizing composite board;
wherein any one of the upper anode and the lower anode in the horizontal plating tank is electrified, and the other anode is not electrified or is not provided with an anode.
2. The preparation method according to claim 1, wherein an insoluble anode is arranged at the upper part of the horizontal plating tank, and an insulating material is arranged at the lower part of the horizontal plating tank.
3. The preparation method according to claim 1, wherein when the surface of the cold rolled stainless steel-carbon steel single-sided composite plate to be galvanized is subjected to single-sided electrogalvanizing by adopting a horizontal plating tank, the electroplated layer is pure zinc Zn; the thickness of the coating is 20/20g/m 2 The current density is more than 85A/dm 2 。
4. The method according to claim 1, wherein when the surface of the cold rolled stainless steel-carbon steel single-sided composite plate to be galvanized on the carbon steel side is single-sided electrogalvanized using a horizontal plating bath, the movement speed of the strip steel as a cathode is 85-95 m/min.
5. The method according to claim 1, wherein when the surface of the carbon steel side of the cold rolled stainless steel-carbon steel single-sided composite plate to be galvanized is single-sided electrogalvanized using a horizontal plating tank, a zinc sulfate solution is used as the plating solution, the concentration is 340-360 g/l, no additive is added, and the temperature is 60-70 ℃.
6. The method according to claim 1, wherein when the surface of the carbon steel side of the cold rolled stainless steel-carbon steel single-sided composite plate to be galvanized is single-sided electrogalvanized using a horizontal plating tank, a zinc sulfate solution is used as the plating solution, the concentration is 350g/l, no additive is added, and the temperature is 65 ℃.
7. The method according to claim 1, wherein when the surface of the carbon steel side of the cold rolled stainless steel-carbon steel single-sided composite plate to be galvanized is single-sided electrogalvanized using a horizontal plating bath, the carbon steel side of the stainless steel-carbon steel single-sided composite plate is an upper side moving horizontally, and the stainless steel side is a lower side.
8. The method according to any one of claims 1 to 7, wherein the step of cleaning the cold rolled stainless steel-carbon steel single-sided composite sheet to obtain a cold rolled stainless steel-carbon steel single-sided composite sheet to be galvanized comprises:
and sequentially unwinding, alkaline washing, electrolytic cleaning, brushing, pickling and rinsing the cold-rolled stainless steel-carbon steel single-sided composite plate to obtain the cold-rolled stainless steel-carbon steel single-sided composite plate to be galvanized.
9. A continuous stainless steel-carbon steel electrogalvanized composite sheet, characterized in that the continuous stainless steel-carbon steel electrogalvanized composite sheet is produced by the production method of any one of claims 1 to 8.
10. The continuous stainless steel-carbon steel electrogalvanized composite plate of claim 9, comprising a carbon steel substrate provided with a stainless steel layer on one side and an electrogalvanized layer on the other side.
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