Method for continuously producing electronickelling composite coating steel strip at high speed

Abstract

The invention relates to a method for continuously producing an electroplated nickel composite coating steel strip at a high speed, and belongs to the technical field of electroplating. The method comprises the following steps: sequentially carrying out chemical alkali washing, first scrubbing, electrolytic alkali washing, second scrubbing, first rinsing, chemical acid washing and second rinsing on a steel strip; the steel strip subjected to second rinsing is subjected to nickel pre-plating treatment in a first nickel electroplating solution; performing third rinsing on the steel belt subjected to nickel pre-plating treatment; the steel strip subjected to third rinsing is subjected to semi-bright nickel plating treatment in a second nickel electroplating solution; and the steel strip subjected to semi-bright nickel plating treatment is subjected to bright nickel plating treatment in a third nickel electroplating solution, and the nickel electroplating composite coating steel strip is obtained. Through the methods of optimizing the technological process, optimizing the components of the electroplating solution, improving the structure of the titanium basket and the like, high-speed, high-efficiency, high-quality and environment-friendly production of the electroplated nickel steel strip is effectively realized.

Description

Technical Field

[0001] The present application relates to the field of electroplating technology, and in particular to a method for high-speed continuous production of electroplated nickel composite-coated steel strips. Background Art

[0002] With the booming new energy vehicle industry, the power lithium battery and related materials industries are experiencing unprecedented growth opportunities. Cylindrical batteries, particularly nickel-plated steel-cased cylindrical batteries, are considered the mainstream direction of future new energy battery development due to their strong compressive strength, high production efficiency, low cost, good consistency, high safety factor, small size, and wide application scenarios. As the primary raw material for these batteries, the quality of nickel-plated steel strip is directly related to battery performance.

[0003] Currently, domestic nickel-plated steel strip production faces several challenges, including narrow product widths (typically no more than 600mm), poor coating uniformity, high production line investment, and low production efficiency. The pre-nickel-plated steel strip market is dominated by foreign products. The existing nickel-plated steel strip production process primarily utilizes the Watt process, which utilizes up to 20-22 electroplating tanks. This requires significant equipment investment, and the plating solution's performance and titanium basket structure limit current density, resulting in low production efficiency. Summary of the Invention

[0004] The present application provides a method for high-speed continuous production of electroplated nickel composite-coated steel strips to solve the following technical problem: how to improve the production efficiency of electroplated nickel steel strips.

[0005] The present invention provides a method for high-speed continuous production of nickel-plated composite-coated steel strips, the method comprising:

[0006] The steel strip is sequentially subjected to chemical alkali cleaning, first brush cleaning, electrolytic alkali cleaning, second brush cleaning, first rinsing, chemical pickling and second rinsing;

[0007] performing a pre-nickel plating treatment on the steel strip after the second rinsing in a first nickel electroplating solution;

[0008] The steel strip after the nickel plating treatment is subjected to a third rinsing;

[0009] Plating the steel strip after the third rinsing with semi-bright nickel in a second nickel electroplating solution;

[0010] The steel strip after the semi-bright nickel plating treatment is subjected to bright nickel plating treatment in a third nickel electroplating solution to obtain a nickel composite electroplated steel strip.

[0011] Optionally, in terms of mass concentration g / L or volume concentration ml / L, the components of the first electroplating nickel solution include: nickel sulfate hexahydrate: 260 g / L to 280 g / L, nickel chloride hexahydrate: 35 g / L to 40 g / L, boric acid: 35 g / L to 45 g / L, wetting agent: 1 ml / L to 2 ml / L; wherein, the wetting agent is composed of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

[0012] Optionally, in terms of mass concentration g / L or volume concentration ml / L, the components of the second electroplating nickel solution include: nickel sulfate hexahydrate: 290 g / L to 300 g / L, nickel chloride hexahydrate: 40 g / L to 50 g / L, boric acid: 45 g / L to 50 g / L, additive: 5 ml / L to 10 ml / L, pyridinium propane sulfonate: 0.2 ml / L to 5 ml / L, wetting agent: 1 ml / L to 2 ml / L; wherein, the additive is composed of propynediol derivatives and alkynylamine compounds, and the wetting agent is composed of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

[0013] Optionally, in terms of mass concentration g / L or volume concentration ml / L, the components of the third electroplating nickel solution include: nickel sulfate hexahydrate: 290 g / L to 300 g / L, nickel chloride hexahydrate: 40 g / L to 50 g / L, boric acid: 45 g / L to 50 g / L, additive: 15 ml / L to 25 ml / L, pyridinium propane sulfonate: 2 ml / L to 5 ml / L, wetting agent: 1 ml / L to 3 ml / L; wherein, the additive is composed of propynediol derivatives and alkynylamine compounds, and the wetting agent is composed of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

[0014] Optionally, the current density of the pre - nickel plating treatment is 2 A / dm 2 ~15 A / dm 2 。

[0015] Optionally, the current densities of both the semi - bright nickel plating treatment and the bright nickel plating treatment are 5 A / dm 2 ~15 A / dm 2 。

[0016] Optionally, the thickness of the electroplated nickel composite coating steel strip is 0.08 mm to 0.8 mm, and the width of the electroplated nickel composite coating steel strip is 600 mm to 1000 mm.

[0017] Optionally, the nickel layer thickness of the electroplated nickel composite coating steel strip is 0.5 μm to 6 μm, and the range difference of the nickel layer thickness of the electroplated nickel composite coating steel strip ≤ 0.24 μm.

[0018] Optionally, the coating structure of the electroplated nickel composite coating steel strip includes: a dull nickel coating, a semi-bright nickel coating, and a semi-bright nickel-bright nickel coating; wherein,

[0019] The thickness ratio of the dull nickel coating, the semi-bright nickel coating, and the semi-bright nickel-bright nickel coating is (1 to 1.3):(3.9 to 4):(1.8 to 2).

[0020] Optionally, the washing solutions for both the chemical alkali washing and the electrolytic alkali washing include a first NaOH solution, the concentration of the first NaOH solution is 40 g / L to 50 g / L, the temperature of the first NaOH solution is 70°C to 80°C, and the current density of the electrolytic alkali washing is 4 A / dm 2 ~20 A / dm 2 .

[0021] Optionally, the washing solutions for both the first brushing and the second brushing include a second NaOH solution, the mass concentration of the second NaOH solution is 30 g / L to 40 g / L, and the temperature of the second NaOH solution is 70°C to 80°C.

[0022] Optionally, the washing solutions for both the first brushing and the second brushing include a second NaOH solution, the mass concentration of the second NaOH solution is 30 g / L to 40 g / L, and the temperature of the second NaOH solution is 70°C to 80°C.

[0023] Optionally, the washing solutions for the first rinsing, the second rinsing, and the third rinsing all include demineralized water.

[0024] Optionally, the anodes for the pre-nickel plating treatment, the semi-bright nickel plating treatment, and the bright nickel plating treatment are titanium baskets filled with nickel blocks, the frames of the titanium baskets are titanium-clad copper, and the interiors of the titanium baskets include titanium-clad copper rods.

[0025] Optionally, the production speed of the method is ≤ 32 m / min.

[0026] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0027] An embodiment of the present application provides a method for continuously and rapidly producing an electroplated nickel composite coating steel strip. The method includes: sequentially subjecting the steel strip to chemical alkali washing, first brushing, electrolytic alkali washing, second brushing, first rinsing, chemical acid washing, and second rinsing; subjecting the steel strip after the second rinsing to pre-nickel plating treatment in a first electroplated nickel solution; subjecting the steel strip after the pre-nickel plating treatment to third rinsing; subjecting the steel strip after the third rinsing to semi-bright nickel plating treatment in a second electroplated nickel solution; subjecting the steel strip after the semi-bright nickel plating treatment to bright nickel plating treatment in a third electroplated nickel solution to obtain an electroplated nickel composite coating steel strip. By improving the titanium basket structure during the pre-nickel plating treatment, semi-bright nickel plating treatment, and bright nickel plating treatment to achieve uniform current distribution, the uniformity of the coating is improved. At the same time, electroplating solutions with fast deposition rates and good stability are selected to ensure the quality and production efficiency of the coating, and parameters such as the current density during the electroplating process are precisely controlled, improving the electroplating efficiency and the quality of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0029] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic flow chart of a method for continuously and rapidly producing an electroplated nickel composite coating steel strip provided by an embodiment of the present application;

[0031] Figure 2 It is a structural diagram of a titanium basket provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0033] The various embodiments of the present application may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be construed as a rigid limitation on the scope of the present application; therefore, it should be considered that the described range description has specifically disclosed all possible sub-ranges and single values within that range; for example, it should be considered that the range description 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., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, and this applies regardless of the range; in addition, whenever a numerical range is indicated herein, it means including any cited number (fraction or integer) within the indicated range.

[0034] In this text, terms including "comprising" etc. mean "including but not limited to". Relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. "And / or", which describes the association relationship of associated objects, indicates that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone; where A and B can be singular or plural. "At least one" means one or more, and "a plurality" means two or more; "at least one kind", "at least one of the following items (pieces)" or similar expressions refer to any combination of these items, including any combination of single items (pieces) or plural items (pieces); for example, "at least one of a, b, or c", or, "at least one of a, b, and c" can both mean: a, b, c, a - b (i.e., a and b), a - c, b - c, or a - b - c, where a, b, and c can be single or multiple respectively. "Parts representation method" such as parts by weight, parts by mass, etc. represents the proportional relationship between each component. In the proportional relationships involved in this text, the parameters that need to be described by proportion should be understood as the antecedents of the proportion formula in the order of description, and the proportional numbers should be understood as the consequents of the proportion formula. For example, if the mass ratio of substance A, substance B, and substance C is 1:2:3, then substance A, substance B, and substance C should correspond one by one with the proportional numbers in the proportion formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0035] Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment, etc. used in this text can be obtained through market purchase or can be prepared by existing methods.

[0036] Figure 1 It is a schematic flow diagram of a method for continuously producing an electroplated nickel composite coating steel strip at high speed provided for the embodiments of the present application.

[0037] AsFigure 1 As shown in Figure 1 , an embodiment of the present application provides a method for continuously producing electroplated nickel composite coating steel strips at high speed. The method includes:

[0038] S1. Sequentially subject the steel strip to chemical alkali cleaning, first brushing, electrolytic alkali cleaning, second brushing, first rinsing, chemical acid pickling, and second rinsing;

[0039] In the production process of electroplated nickel steel strips, the pretreatment of the steel strip is a crucial step, which directly affects the quality and performance of the subsequent electroplated layer. The steel strip pretreatment process provided by the embodiment of the present application includes steps such as chemical alkali cleaning, brushing, electrolytic alkali cleaning, rinsing, and chemical acid pickling. Appropriate cleaning agents and conditions are used in each step to ensure that the surface of the steel strip is thoroughly cleaned and prepared, providing a high-quality substrate for the subsequent electroplating process.

[0040] In some embodiments, the cleaning solutions for both the chemical alkali cleaning and the electrolytic alkali cleaning include a first NaOH solution. The concentration of the first NaOH solution is 40 g / L to 50 g / L, the temperature of the first NaOH solution is 70°C to 80°C, and the current density of the electrolytic alkali cleaning is 4 A / dm 2 ~20 A / dm 2 .

[0041] Chemical alkali cleaning is the first step in the pretreatment of the steel strip, aiming to remove grease, dirt, and other impurities on the surface of the steel strip. In the embodiment of the present application, NaOH solution is used as the cleaning agent for chemical alkali cleaning. The concentration of the NaOH solution is 40 g / L to 50 g / L, and this concentration range can ensure effective cleaning effect while avoiding excessive corrosion of the steel strip substrate. The temperature of the NaOH solution is controlled at 70°C to 80°C, and this temperature range can accelerate chemical reactions and improve cleaning efficiency.

[0042] In some embodiments, the cleaning solutions for both the first brushing and the second brushing include a second NaOH solution. The mass concentration of the second NaOH solution is 30 g / L to 40 g / L, and the temperature of the second NaOH solution is 70°C to 80°C.

[0043] After chemical alkali cleaning, some cleaning agents and other impurities will remain on the surface of the steel strip. In order to thoroughly remove these residues, the first brushing is required. After electrolytic alkali cleaning, some impurities generated by electrolysis may remain on the surface of the steel strip again. Therefore, the second brushing is required. The conditions for the second brushing are the same as those for the first brushing, that is, using NaOH solution with a concentration of 30 g / L to 40 g / L and maintaining the temperature at 70°C to 80°C.

[0044] Electrolytic alkali cleaning is carried out in an electrolytic cell. By applying a certain voltage and current, the cleaning process of the steel strip surface is accelerated using electrolysis. Compared with chemical alkali cleaning, electrolytic alkali cleaning has higher cleaning efficiency and better cleaning quality. In the embodiments of this application, the current density of electrolytic alkali cleaning is 4 A / dm 2 ~20 A / dm 2 , this current density range can ensure uniform cleaning of the steel strip surface, while avoiding excessive hydrogen generation during electrolysis from damaging the steel strip.

[0045] In some embodiments, the cleaning solution for chemical pickling includes an aqueous sulfuric acid solution, the mass concentration of the aqueous sulfuric acid solution is 50 g / L to 90 g / L, and the temperature of the aqueous sulfuric acid solution is 40°C to 50°C.

[0046] Chemical pickling aims to remove the oxide layer and other impurities on the steel strip surface, providing a clean substrate for the electroplating process. In the embodiments of this application, chemical pickling uses an aqueous sulfuric acid solution with a concentration of 50 g / L to 90 g / L and the temperature is controlled at 40°C to 50°C. This sulfuric acid concentration and temperature can ensure effective pickling effect while avoiding excessive corrosion of the steel strip substrate.

[0047] S2. Perform pre-nickel plating treatment on the steel strip after the second rinsing in the first nickel plating solution;

[0048] Pre-nickel plating treatment plays a crucial role in ensuring the quality and performance of the final coating. The purpose of this step is to form a uniform and dense nickel bottom layer on the steel strip surface to enhance the adhesion between the steel strip surface and the subsequent electroplated layer, and improve the corrosion resistance and wear resistance of the overall coating. Through pre-nickel plating treatment, a good foundation can be provided for the subsequent electroplating process, thereby obtaining high-quality electroplated products. In the embodiments of this application, 1 plating bath is used for pre-nickel plating treatment.

[0049] In some embodiments, calculated by mass concentration g / L or volume concentration ml / L, the components of the first nickel plating solution include: nickel sulfate hexahydrate: 260 g / L to 280 g / L, nickel chloride hexahydrate: 35 g / L to 40 g / L, boric acid: 35 g / L to 45 g / L, wetting agent: 1 ml / L to 2 ml / L; wherein, the wetting agent is composed of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

[0050] In the embodiments of this application, nickel sulfate hexahydrate serves as the main salt to provide nickel ions for deposition; nickel chloride hexahydrate serves as an auxiliary salt to help control the conductivity and deposition rate of the plating solution; boric acid serves as a buffer for the electroplating solution, which can stabilize the pH value of the electroplating solution and prevent drastic fluctuations in the pH value during electroplating, thereby ensuring the stability of the coating quality. In addition, a wetting agent is added to improve the wetting performance of the plating solution, which helps with uniform deposition.

[0051] In some embodiments, the current density of the pre-nickel plating treatment is 2 A / dm 2 ~15 A / dm 2 .

[0052] The current density of the pre-nickel plating treatment affects the coating quality and deposition rate.

[0053] S3. Thirdly rinse the steel strip after the pre-nickel plating treatment;

[0054] In some embodiments, the washing liquids for the first rinse, the second rinse and the third rinse all include demineralized water.

[0055] S4. Perform semi-bright nickel plating treatment on the steel strip after the third rinse in a second nickel plating solution;

[0056] S5. Perform bright nickel plating treatment on the steel strip after the semi-bright nickel plating treatment in a third nickel plating solution to obtain a steel strip with an electroplated nickel composite coating.

[0057] After the pre-nickel plating treatment is completed, semi-bright nickel plating and bright nickel plating treatments need to be carried out to form nickel composite coatings with different gloss degrees and properties. These two steps are crucial in the electroplating process because they directly affect the appearance and durability of the final product. In the embodiments of the present application, 4 plating tanks are used for the semi-bright nickel plating treatment and 2 plating tanks are used for the bright nickel plating treatment.

[0058] In some embodiments, in terms of mass concentration g / L or volume concentration ml / L, the components of the second nickel plating solution include: nickel sulfate hexahydrate: 290 g / L~300 g / L, nickel chloride hexahydrate: 40 g / L~50 g / L, boric acid: 45 g / L~50 g / L, additive: 5 ml / L~10 ml / L, pyridinium propane sulfonate: 0.2 ml / L~5 ml / L, wetting agent: 1 ml / L~2 ml / L; wherein, the additive is composed of propynediol derivatives and alkynylamine compounds, and the wetting agent is composed of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

[0059] In some embodiments, in terms of mass concentration g / L or volume concentration ml / L, the components of the third nickel plating solution include: nickel sulfate hexahydrate: 290 g / L~300 g / L, nickel chloride hexahydrate: 40 g / L~50 g / L, boric acid: 45 g / L~50 g / L, additive: 15 ml / L~25 ml / L, pyridinium propane sulfonate: 2 ml / L~5 ml / L, wetting agent: 1 ml / L~3 ml / L; wherein, the additive is composed of propynediol derivatives and alkynylamine compounds, and the wetting agent is composed of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

[0060] The solution compositions for plating semi-bright nickel and bright nickel are different. The semi-bright nickel plating solution mainly contains basic components such as nickel sulfate hexahydrate, nickel chloride hexahydrate, boric acid, wetting agent, etc., as well as a small amount of additives and pyridinium propane sulfonate. In the embodiments of the present application, the additive is composed of propynediol derivatives and alkynylamine compounds, and these compounds can refine the grain size of the coating, improve the smoothness and gloss of the coating, and at the same time enhance the hardness and corrosion resistance of the coating. Pyridinium propane sulfonate, as a leveling agent, can adjust the stress distribution of the coating, reduce the internal stress of the coating, thereby improving the toughness and crack resistance of the coating. In the second nickel plating solution, the contents of the additive and pyridinium propane sulfonate are relatively small, so the surface of the coating shows a relatively rough gloss. In the third nickel plating solution, on the basis of the basic components, more additives and pyridinium propane sulfonate are added, and the function is to improve the gloss and flatness of the coating, making the surface smoother and brighter.

[0061] In some embodiments, the current density of the semi-bright nickel plating treatment and the bright nickel plating treatment is 5 A / dm 2 ~15 A / dm 2 .

[0062] In some embodiments, the thickness of the electroplated nickel composite coating steel strip is 0.08 mm to 0.8 mm, and the width of the electroplated nickel composite coating steel strip is 600 mm to 1000 mm.

[0063] In some embodiments, the nickel layer thickness of the electroplated nickel composite coating steel strip is 0.5 μm to 6 μm, and the range of the nickel layer thickness of the electroplated nickel composite coating steel strip ≤ 0.24 μm.

[0064] The range of the nickel layer thickness refers to the maximum difference value of the nickel layer thickness on the electroplated nickel composite coating steel strip. In the embodiments of the present application, in order to ensure the consistency and reliability of the coating, the range of the nickel layer thickness is controlled within 0.24 μm. This control target aims to reduce the fluctuation of the coating thickness, thereby improving the overall performance and uniformity of the steel strip.

[0065] In some embodiments, the coating structure of the electroplated nickel composite coating steel strip includes: a dull nickel coating, a semi-bright nickel coating, and a semi-bright nickel - bright nickel coating; among them,

[0066] The thickness ratio of the dull nickel coating, the semi-bright nickel coating, and the semi-bright nickel - bright nickel coating is (1 - 1.3):(3.9 - 4):(1.8 - 2).

[0067] In the embodiments of the present application, the coating structure of the electroplated nickel composite coating steel strip is designed to include multiple layers, specifically including a dull nickel coating, a semi-bright nickel coating, and a semi-bright nickel - bright nickel coating. This multi-layer structure aims to provide various performance advantages, such as enhancing corrosion resistance, improving wear resistance, and improving appearance, etc.

[0068] In some embodiments, the anodes for the pre-nickel plating treatment, the semi-bright nickel plating treatment, and the bright nickel plating treatment are titanium baskets filled with nickel blocks. The frames of the titanium baskets are titanium-coated copper, and the interiors of the titanium baskets include titanium-coated copper rods.

[0069] The titanium baskets are used as anodes during electroplating. Their interiors are filled with the anode material, nickel blocks. Through the action of an electric current, the nickel blocks inside the titanium baskets gradually dissolve and deposit on the cathode to form the required electroplated layer. To improve the current distribution and enhance the uniformity of the coating, in the embodiments of the present application, the frames of the titanium baskets used are titanium-coated copper, and the interiors include titanium-coated copper rods to enhance the uniformity of current distribution in the titanium baskets.

[0070] In some embodiments, the production speed of the method is ≤ 32 m / min.

[0071] The method provided by the embodiments of the present application can reach a maximum production speed of 32 m / min, improving production efficiency while ensuring product quality.

[0072] The embodiments of the present application adopt a reverse osmosis filtration + evaporator concentration mode to treat nickel-containing wastewater, achieving zero discharge and reducing production costs.

[0073] The following further elaborates the present application in conjunction with specific embodiments. For the experimental methods without specific conditions indicated in the following embodiments, they are generally determined according to national standards / industry standards; if there are no corresponding national standards / industry standards, they are carried out according to general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0074] The embodiments of the present application provide a method for continuously and highly speedily producing an electroplated nickel composite coating steel strip, including the following steps:

[0075] Subject the steel strip to chemical alkali washing, first brushing, electrolytic alkali washing, second brushing, first rinsing, chemical acid washing, and second rinsing in sequence;

[0076] Subject the steel strip after the second rinsing to pre-nickel plating treatment in a first electroplated nickel solution;

[0077] Subject the steel strip after the pre-nickel plating treatment to third rinsing;

[0078] Subject the steel strip after the third rinsing to semi-bright nickel plating treatment in a second electroplated nickel solution;

[0079] Subject the steel strip after the semi-bright nickel plating treatment to bright nickel plating treatment in a third electroplated nickel solution to obtain an electroplated nickel composite coating steel strip. See Table 1 for the main process parameters.

[0080] Table 1

[0081]

[0082] The salt spray resistance of the nickel-plated steel sheet was evaluated with reference to GB / T 10125-2021 "Artificial Atmosphere Corrosion Test - Salt Spray Test" and GB / T 6461-2002 "Rating of Specimens and Test Pieces of Metals and Other Inorganic Coatings on Metallic Substrates after Corrosion Tests". The specific results are shown in Table 1.

[0083] As can be seen from Table 1, the process parameters of the examples are all within the required range of the present invention, and the production speed reaches up to 32 m / min.

[0084] Appendix Figure 2 Detailed description:

[0085] Figure 2 This is the structural diagram of the titanium basket provided by the embodiment of the present application. The overall material of the titanium basket is metallic titanium, the frame is titanium-coated copper, and there are 5 titanium-coated copper rods inside the titanium basket.

[0086] One or more technical solutions in the embodiments of the present invention at least further have the following technical effects or advantages:

[0087] In the embodiment of the present invention, the number of electroplating tanks is reduced to 7, and the equipment investment is about 1 / 3 of the traditional process.

[0088] In the embodiment of the present invention, the production speed can reach up to 32 m / min at most, the upper limit of the current density is high, and the production efficiency is high.

[0089] The titanium basket structure in the embodiment of the present invention is conducive to realizing uniform current distribution, the coating uniformity is good, and the coating thickness difference is ≤ 0.24 μm.

[0090] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown in the present application, but will conform to the widest scope consistent with the principles and novel features claimed in the present application.

Claims

1. A method for continuously and rapidly producing an electroplated nickel composite coating steel strip, the method comprising: subjecting the steel strip to chemical alkali washing, first brushing, electrolytic alkali washing, second brushing, first rinsing, chemical acid washing and second rinsing in sequence; subjecting the steel strip after the second rinsing to pre-nickel plating treatment in a first electroplated nickel solution; subjecting the steel strip after the pre-nickel plating treatment to third rinsing; subjecting the steel strip after the third rinsing to semi-bright nickel plating treatment in a second electroplated nickel solution; subjecting the steel strip after the semi-bright nickel plating treatment to bright nickel plating treatment in a third electroplated nickel solution to obtain an electroplated nickel composite coating steel strip.

2. The method according to claim 1, wherein Based on mass concentration g / L or volume concentration ml / L, the components of the first electroplated nickel solution include: nickel sulfate hexahydrate: 260 g / L to 280 g / L, nickel chloride hexahydrate: 35 g / L to 40 g / L, boric acid: 35 g / L to 45 g / L, wetting agent: 1 ml / L to 2 ml / L; wherein, the wetting agent consists of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

3. The method according to claim 1, characterized in that Based on mass concentration g / L or volume concentration ml / L, the components of the second electroplated nickel solution include: nickel sulfate hexahydrate: 290 g / L to 300 g / L, nickel chloride hexahydrate: 40 g / L to 50 g / L, boric acid: 45 g / L to 50 g / L, additive: 5 ml / L to 10 ml / L, pyridinium propane sulfonate: 0.2 ml / L to 5 ml / L, wetting agent: 1 ml / L to 2 ml / L; wherein, the additive consists of propynediol derivatives and alkynylamine compounds, and the wetting agent consists of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

4. The method according to claim 1, wherein Based on mass concentration g / L or volume concentration ml / L, the components of the third electroplated nickel solution include: nickel sulfate hexahydrate: 290 g / L to 300 g / L, nickel chloride hexahydrate: 40 g / L to 50 g / L, boric acid: 45 g / L to 50 g / L, additive: 15 ml / L to 25 ml / L, pyridinium propane sulfonate: 2 ml / L to 5 ml / L, wetting agent: 1 ml / L to 3 ml / L; wherein, the additive consists of propynediol derivatives and alkynylamine compounds, and the wetting agent consists of sodium dioctyl sulfosuccinate and sodium dodecyl sulfate.

5. The method according to claim 1, characterized in that The current density of the pre-nickel plating treatment is 2 A / dm 2 ~15 A / dm 2 ; and / or, The current density of both the semi-bright nickel plating treatment and the bright nickel plating treatment is 5 A / dm 2 ~15 A / dm 2 .

6. The method according to claim 1, wherein The thickness of the electroplated nickel composite coating steel strip is 0.08 mm to 0.8 mm, and the width of the electroplated nickel composite coating steel strip is 600 mm to 1000 mm; and / or, The nickel layer thickness of the electroplated nickel composite coating steel strip is 0.5 μm to 6 μm, and the range of the nickel layer thickness of the electroplated nickel composite coating steel strip ≤ 0.24 μm.

7. The method according to claim 1, wherein The coating structure of the electroplated nickel composite coating steel strip includes: a dull nickel coating, a semi-bright nickel coating and a semi-bright nickel - bright nickel coating; wherein, The thickness ratio of the dull nickel coating, the semi-bright nickel coating and the semi-bright nickel - bright nickel coating is (1 to 1.3):(3.9 to 4):(1.8 to 2).

8. The method according to claim 1, characterized in that The washing liquids of the chemical caustic washing and the electrolytic caustic washing both include a first NaOH solution, the concentration of the first NaOH solution is 40 g / L to 50 g / L, the temperature of the first NaOH solution is 70 °C to 80 °C, and the current density of the electrolytic caustic washing is 4 A / dm 2 ~20 A / dm 2 ; and / or, The washing liquids for the first brushing and the second brushing both include a second NaOH solution, the mass concentration of the second NaOH solution is 30 g / L to 40 g / L, and the temperature of the second NaOH solution is 70 °C to 80 °C; and / or, The washing liquid for the chemical pickling includes an aqueous sulfuric acid solution, the mass concentration of the aqueous sulfuric acid solution is 50 g / L to 90 g / L, and the temperature of the aqueous sulfuric acid solution is 40 °C to 50 °C; and / or, The washing liquids for the first rinsing, the second rinsing and the third rinsing all include demineralized water.

9. The method according to claim 1, wherein The anodes for the pre-nickel plating treatment, the semi-bright nickel plating treatment and the bright nickel plating treatment are titanium baskets filled with nickel blocks, the frames of the titanium baskets are titanium-clad copper, and the interiors of the titanium baskets include titanium-clad copper rods.

10. The method according to claim 1, characterized in that, The production speed of the method is ≤ 32 m / min.

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