A corrosion-resistant steel strip and multi-layer coating process thereof

Abstract

The present invention relates to the technical field of steel strip plating, and specifically to a corrosion-resistant steel strip and a multi-layer plating process thereof. Specifically, the following steps are included: S1: pre-treating the steel strip by three steps of cleaning, roughening and activating to obtain a pre-treated steel strip; S2: immersing the pre-treated steel strip in a nickel plating solution for electroplating, and then plasma spraying the pre-treated steel strip, and finally plating an inner nickel layer on its surface to obtain a nickel-plated steel strip I; S3: plating an intermediate nickel layer on the surface of the nickel-plated steel strip I by a plasma spraying method to obtain a nickel-plated steel strip II; S4: plating an outer nickel layer on the surface of the nickel-plated steel strip II by a plasma spraying method to obtain a nickel-plated steel strip III; S5: heat-treating the nickel-plated steel strip III to obtain a corrosion-resistant steel strip. The present invention greatly improves the wear resistance and corrosion resistance of the steel strip by sequentially plating an inner nickel layer, an intermediate nickel layer and an outer nickel layer on the steel strip, and the layers are tightly bonded.

Description

Technical Field

[0001] The invention relates to the technical field of steel strip plating, in particular to a corrosion-resistant steel strip and a multi-layer plating process thereof. Background Art

[0002] In recent years, as people's requirements for battery performance have become higher and higher, the performance of battery shell materials such as alkaline manganese batteries, nickel-metal hydride batteries and lithium-ion power batteries has also attracted more and more attention from professionals. As a sealed container, the battery shell is filled with highly corrosive electrolytes, so it is required to have strong enough corrosion resistance.

[0003] At present, the commonly used method is to enhance the corrosion resistance of the battery shell by plating a nickel layer on the battery shell, but if it is a pure nickel layer, it has the limitations of high cost and the corrosion resistance cannot be maximized. In the existing patent CN102148339A, a nickel-cobalt / nickel / nickel-cobalt multilayer film battery shell steel strip and its preparation process are disclosed. The steel strip is used as the substrate, and the two sides of the steel strip are respectively plated with nickel-cobalt / nickel / nickel-cobalt multilayer films. The bottom layer is a nanocrystalline nickel-cobalt alloy coating, the middle layer is a micron-crystalline nickel coating, and the surface layer is a nanocrystalline nickel-cobalt alloy coating. The multilayer film material of this invention optimizes and improves the corrosion resistance and stamping performance of the steel strip as a whole. After the battery shell is stamped into a battery shell with this steel strip and the battery is assembled, the electrical performance and storage performance of the battery can be improved.

[0004] Based on this, the present invention provides a corrosion-resistant steel strip and a multi-layer coating process thereof. Summary of the invention

[0005] The object of the present invention is to provide a corrosion-resistant steel strip and a multi-layer coating process thereof to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-layer coating process for a corrosion-resistant steel strip comprises the following steps:

[0008] S1: pre-treating the steel strip to obtain a pre-treated steel strip;

[0009] S11: After the whole coil of steel strip raw material is uncoiled and straightened in sequence, it is immersed in an acidic degreasing agent at 40-50° C. for 2-10 minutes, taken out, rinsed with clean water, and dried to complete the cleaning and roughening treatment to obtain a pretreated steel strip I;

[0010] S12: immersing the pretreated steel strip I in the activation solution at 40-50° C. for 1-3 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0011] S2: immersing the pretreated steel strip in a nickel plating solution for electroplating, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with an inner nickel layer to obtain a nickel-plated steel strip I;

[0012] S3: using a plasma spraying method to coat an intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0013] S4: using a plasma spraying method to coat an outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0014] S5: heat treating the nickel-plated steel strip III to obtain a corrosion-resistant steel strip.

[0015] Furthermore, the acidic degreasing agent is obtained by mixing a degreasing agent of model KZD-1012, an enhancer and water in a volume ratio of 2:(1-2):10.

[0016] Furthermore, the enhancer includes the following raw materials in concentrations: concentrated sulfuric acid 5-10 g / L, citric acid 20-30 g / L, corrosion inhibitor 5-10 g / L, stabilizer 5-10 g / L, and the solvent is water.

[0017] Furthermore, the corrosion inhibitor includes but is not limited to a combination of one or more of sodium silicate, aniline, and hexamethylenetetramine.

[0018] Furthermore, the stabilizer includes but is not limited to a combination of one or more of 4-pentoxybenzyl alcohol, 1,2,5-pentanetriol, and neopentyl glycol dibenzoate.

[0019] Furthermore, the roughness of the pretreated steel strip I is Ra=0.8~1.2μm.

[0020] Furthermore, the activation solution includes the following raw materials in concentration: 35-37 wt % hydrochloric acid and 5-10 g / L surfactant.

[0021] Furthermore, the surfactant includes but is not limited to a combination of one or more of sodium allyl sulfonate, sodium o-sulfonylbenzamide, sodium vinyl sulfonate, OP-10, and NP-10; the surfactant has an activation effect, and cooperates with hydrochloric acid to activate the steel strip, thereby further enhancing the bonding force between the steel strip and the metal coating.

[0022] The surface of the steel strip contains substances such as rust, oil, and oxide film that affect the bonding strength with the metal coating. Therefore, in order to make the metal plating process go smoothly and obtain a metal coating with good bonding strength, the steel strip needs to be cleaned before formal plating to remove substances such as rust, oil, and oxide film. In addition, another way to promote the bonding strength of the metal coating is to increase the roughness of the substrate. On the one hand, the roughness can increase the contact area between the metal coating and the substrate, and on the other hand, the roughness can increase the mechanical bite force between the metal coating and the substrate, thereby improving the bonding strength of the metal coating. However, it is also necessary to pay attention to the control of roughness. Roughness itself is a crack source, which will cause stress concentration and damage to the substrate; and too low roughness will also reduce the bonding strength.

[0023] Based on the above reasons, the present invention uses an acidic degreasing agent to pre-treat the steel strip (including cleaning and roughening treatment). Since the thickness of oil stains, rust, and oxide film on the surface of the steel strip is not uniform, there must be some areas where oil stains and other pollutants are cleaned, while other areas are not completely cleaned. Therefore, by further controlling the treatment time of the steel strip in the acidic degreasing agent, the steel strip can be completely cleaned and subjected to a certain acid etching treatment, thereby increasing the roughness of the steel strip. In order to maximize the bonding strength between the steel strip and the subsequent coating, the roughness Ra in the present invention is controlled between 0.8 and 1.2 μm.

[0024] In addition, since the KZD-1012 degreasing agent has strong degreasing and rust removal capabilities, but poor acid etching capabilities, an enhancer is prepared in the present invention to improve it. Concentrated sulfuric acid and citric acid can increase the activity of acid etching and promote subsequent acid etching; the corrosion inhibitor plays a role in preventing the steel strip from being excessively acid-etched; and the stabilizer plays a role in promoting the affinity between the KZD-1012 degreasing agent and the enhancer, enhancing the connection between the two, so as to improve the performance of the acid degreasing agent.

[0025] Furthermore, the nickel plating solution comprises the following raw materials in concentration: 180-300 g / L nickel sulfate, 30-50 g / L nickel chloride, 30-50 g / L boric acid, and the solvent is water.

[0026] Furthermore, the pH of the nickel plating solution is adjusted to 3.5-4.5 using ammonia water.

[0027] Furthermore, the process parameters of the electroplating treatment are: the current density is 2~6A / dm 2 , the electroplating temperature is 50~70℃.

[0028] Furthermore, in S2, the spraying powder used for the plasma spraying is nickel powder with a purity of ≥99.99% and a particle size of 1~5μm.

[0029] Furthermore, the process parameters of the plasma spraying treatment are: power of 30-40KW, powder feeding rate of 20-30g / min, argon flow rate of 45-55L / min, hydrogen flow rate of 20-25L / min, and spraying distance of 90-110mm.

[0030] Furthermore, the inner nickel layer has a thickness of 15-20 μm.

[0031] Since the surface of the pre-treated steel strip has a certain degree of roughness, the scheme first adopts the electroplating method to deposit nickel as completely as possible on all parts of the surface of the pre-treated steel strip; however, the electroplating treatment has the problem that the quality and thickness of the coating are difficult to control, and this situation will be more serious when the surface of the pre-treated steel strip itself has a certain degree of roughness. Therefore, the scheme further adopts the plasma spraying method to spray nickel on the electroplated nickel layer to compensate for the defects caused by the electroplating treatment, and finally a nickel layer with uniform quality and thickness is plated on the pre-treated steel strip; in order to prevent the quality of the coating obtained by electroplating from having major defects, the process parameters of the electroplating treatment should be strictly controlled, such as the current density being controlled at 2~6A / dm 2 , the electroplating temperature is controlled at 50~70℃.

[0032] Furthermore, in S3, the powder used for plasma spraying includes the following raw materials in a mass percentage ratio: nickel powder 93-97wt%, cobalt powder 1-4wt%, titanium dioxide 1-3wt%, nickel / titanium carbide / graphene nanomaterial 0.5-1.5wt%.

[0033] Furthermore, the purity of the titanium dioxide and cobalt powders is 99.99% and the particle size is 1-5 μm.

[0034] Furthermore, the preparation method of the nickel / titanium carbide / graphene nanomaterial is: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 2-10 hours, and then vacuum sintering for 2-6 hours at 950-1000° C. and 15-25 MPa to obtain the nickel / titanium carbide / graphene nanomaterial.

[0035] Furthermore, the mass ratio of the graphene, nickel powder and titanium carbide is (0.01-0.2):100:(0.2-0.5); wherein the graphene is in a single-layer sheet with a thickness of 0.5-1.2 nm, the particle size of the nickel powder is 1-5 μm, and the particle size of the titanium carbide is 1-5 μm.

[0036] Furthermore, the thickness of the intermediate nickel layer is 10-20 μm.

[0037] In the present invention, a layer of intermediate nickel layer is plated on the inner nickel layer by plasma spraying technology, and cobalt, titanium dioxide, nickel / titanium carbide / graphene nanomaterials are added to the intermediate nickel layer. Among them, cobalt can stabilize the lattice structure of nickel, reduce the formation of crystal defects in the intermediate nickel layer, and increase the stability of the intermediate nickel layer; titanium dioxide has a certain lubricating effect and can enhance the wear resistance of the intermediate nickel layer; graphene can cooperate with titanium dioxide to enhance the wear resistance of the intermediate nickel layer, and titanium carbide can promote the wear resistance of graphene, and both of them have certain modification and enhancement for corrosion resistance. Therefore, in the present invention, titanium carbide and graphene are introduced by nickel / titanium carbide / graphene nanomaterials, which not only solves the problem that single graphene is not tightly combined with metal, but also has obvious enhancement of the wear resistance and corrosion resistance of the intermediate nickel layer, and will not affect the bonding between the intermediate nickel layer and the inner nickel layer.

[0038] Further, in S4, the powder used for plasma spraying includes the following raw materials in a mass percentage ratio: nickel powder 87~92wt%, aluminum powder 3~6wt%, cobalt powder 1~3wt%, titanium dioxide 1~2wt%, tungsten carbide 0.5~2wt%, silicon carbide 0.5~2wt%, nickel / titanium carbide / graphene nanomaterial 0.5~2wt%.

[0039] Furthermore, the thickness of the outer nickel layer is 10-20 μm.

[0040] Furthermore, the purity of the aluminum powder, cobalt powder, titanium dioxide, tungsten carbide and silicon carbide is 99.99% and the particle size is 1-5 μm.

[0041] In the present invention, a plasma spraying technology is further used to plate an outer nickel layer on the middle nickel layer. Compared with the middle inner layer, aluminum powder, tungsten carbide and silicon carbide are further added to the outer nickel layer. Tungsten carbide and silicon carbide can enhance the wear resistance and corrosion resistance of the outer nickel layer; aluminum powder can promote the compactness of silicon carbide, tungsten carbide and nickel / titanium carbide / graphene nanomaterials in the outer nickel layer, thereby making tungsten carbide, silicon carbide and nickel / titanium carbide / graphene nanomaterials fully play their role; and nickel powder and aluminum powder have a certain adhesion after plasma spraying, which can promote the bonding with the middle nickel layer; in addition, in order to ensure the quality of each layer, the process parameters of plasma spraying should be strictly controlled.

[0042] Furthermore, the heat treatment process is: placing the nickel-plated steel plate III in an argon atmosphere, heating it at 500~700℃ for 1~5h, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment; after heat treatment, the bonding strength between the inner nickel layer and the steel strip and the middle nickel layer, the middle nickel layer and the inner nickel layer and the outer nickel layer, and the outer nickel layer and the middle nickel layer can be further strengthened; at the same time, the density of each layer is also enhanced.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. In the present invention, the bonding force between the steel strip and the inner nickel layer is greatly enhanced by performing a three-step pretreatment of the steel strip, namely, a cleaning treatment, a roughening treatment, and an activation treatment;

[0045] 2. In the present invention, through electroplating treatment + plasma spraying treatment, the inner nickel layer with uniform quality and thickness is plated, which greatly promotes the combination of the subsequent intermediate nickel layer and the inner nickel layer;

[0046] 3. In the present invention, by adjusting the plasma spraying powder, the middle nickel layer is plated on the inner nickel layer and the outer nickel layer is plated on the middle nickel layer in sequence, the layers are tightly combined, and the wear resistance and corrosion resistance of the steel strip are significantly improved. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that the purchasers of all raw materials involved in the present invention include, without any special restrictions, illustratively:

[0049] The steel strip is 301 stainless steel strip, purchased from Wuxi Wangshang Stainless Steel Co., Ltd.

[0050] KZD-1012 degreasing agent, purchased from Zhengzhou Kezhide Trading Co., Ltd.;

[0051] Sodium silicate with a purity of 99% and 4-pentyloxybenzyl alcohol with a purity of 99% were purchased from Shanghai Jinjinle Industrial Co., Ltd.;

[0052] Sodium allyl sulfonate had a purity of 99%, nickel powder, cobalt powder, titanium dioxide, and aluminum powder had a purity of 99.99%, and a particle size of 1 to 5 μm, purchased from Hubei Jusheng Technology Co., Ltd.;

[0053] Graphene is in the form of a single-layer sheet with a thickness of 0.5-1.2 nm, purchased from Di Chuang (Suzhou) New Materials Technology Co., Ltd.;

[0054] Titanium carbide, silicon carbide, and tungsten carbide all have a purity of 99.99% and a particle size of 1 to 5 μm and were purchased from Shanghai Buwei Applied Materials Technology Co., Ltd.

[0055] Example 1: A multi-layer coating process for corrosion-resistant steel strip:

[0056] S1: Preparation of pre-treated steel strip:

[0057] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 45°C for 5 minutes, taken out, rinsed with clean water, dried, and the cleaning and roughening treatments are completed to obtain a pretreated steel strip I, and its Ra is detected to be 0.95±0.01μm;

[0058] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent, an enhancer and water in a volume ratio of 2:1.5:10, the enhancer is obtained by mixing the following raw materials in concentration, including: concentrated sulfuric acid 8g / L, citric acid 24g / L, sodium silicate 7g / L, 4-pentyloxybenzyl alcohol 7g / L, and the solvent is water;

[0059] S12: immersing the pretreated steel strip I in the activation solution at 45° C. for 2 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0060] The activation solution is obtained by mixing the following raw materials with different concentrations, including: 36wt% hydrochloric acid, 8g / L sodium allyl sulfonate;

[0061] S2: first immersing the pretreated steel strip in a nickel plating solution for electroplating treatment, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with a 15 μm thick inner nickel layer to obtain a nickel-plated steel strip I;

[0062] The nickel plating solution is obtained by mixing the following raw materials, including: 270 g / L nickel sulfate, 40 g / L nickel chloride, 40 g / L boric acid, the solvent is water, and ammonia water is added to adjust the pH to 4;

[0063] The process parameters of electroplating are: current density is 4A / dm 2 , the electroplating temperature is 55℃;

[0064] The powder used for plasma spraying is nickel powder;

[0065] The process parameters of plasma spraying treatment are: power 35KW, powder feeding rate 25g / min, argon flow rate 50L / min, hydrogen flow rate 22.5L / min, spraying distance 100mm;

[0066] S3: Preparation of nickel-plated steel strip II:

[0067] S31: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 5 hours, and then sintering in vacuum at 980° C. and 20 MPa for 4 hours to obtain nickel / titanium carbide / graphene nanomaterials;

[0068] Among them, the mass ratio of graphene, nickel powder and titanium carbide is 0.1:100:0.4;

[0069] S32: using a plasma spraying method to plate a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0070] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 93.8wt% nickel powder, 2.8wt% cobalt powder, 2.2wt% titanium dioxide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0071] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0072] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 88.8wt% nickel powder, 5wt% aluminum powder, 2.2wt% cobalt powder, 1.2wt% titanium dioxide, 0.8wt% tungsten carbide, 0.8wt% silicon carbide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0073] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0074] Example 2: A multi-layer coating process for corrosion-resistant steel strip:

[0075] S1: Preparation of pre-treated steel strip:

[0076] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 40°C for 2 minutes, taken out, rinsed with clean water, and dried to complete the cleaning and roughening treatment to obtain a pretreated steel strip I, and its Ra is detected to be 0.82±0.01μm;

[0077] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent, an enhancer and water in a volume ratio of 2:1:10, the enhancer is obtained by mixing the following raw materials in concentration, including: concentrated sulfuric acid 8g / L, citric acid 24g / L, sodium silicate 7g / L, 4-pentyloxybenzyl alcohol 7g / L, and the solvent is water;

[0078] S12: immersing the pretreated steel strip I in the activation solution at 40° C. for 1 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0079] The activation solution is obtained by mixing the following raw materials with different concentrations, including: 36wt% hydrochloric acid, 8g / L sodium allyl sulfonate;

[0080] S2: first immersing the pretreated steel strip in a nickel plating solution for electroplating treatment, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with a 15 μm thick inner nickel layer to obtain a nickel-plated steel strip I;

[0081] The nickel plating solution is obtained by mixing the following raw materials, including: 270 g / L nickel sulfate, 40 g / L nickel chloride, 40 g / L boric acid, the solvent is water, and ammonia water is added to adjust the pH to 4;

[0082] The process parameters of electroplating are: current density is 2A / dm 2 , the electroplating temperature is 50℃;

[0083] The powder used for plasma spraying is nickel powder;

[0084] The process parameters of plasma spraying treatment are: power 30KW, powder feeding rate 25g / min, argon flow rate 45L / min, hydrogen flow rate 20L / min, spraying distance 100mm;

[0085] S3: Preparation of nickel-plated steel strip II:

[0086] S31: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 5 hours, and then sintering in vacuum at 980° C. and 20 MPa for 4 hours to obtain nickel / titanium carbide / graphene nanomaterials;

[0087] Among them, the mass ratio of graphene, nickel powder and titanium carbide is 0.01:100:0.2;

[0088] S32: using a plasma spraying method to plate a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0089] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 93.8wt% nickel powder, 2.8wt% cobalt powder, 2.2wt% titanium dioxide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0090] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II, namely, the nickel-plated steel strip III;

[0091] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 88.8wt% nickel powder, 5wt% aluminum powder, 2.2wt% cobalt powder, 1.2wt% titanium dioxide, 0.8wt% tungsten carbide, 0.8wt% silicon carbide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0092] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0093] Example 3: A multi-layer coating process for corrosion-resistant steel strip:

[0094] S1: Preparation of pre-treated steel strip:

[0095] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 50°C for 10 minutes, taken out, rinsed with clean water, and dried to complete the cleaning and roughening treatment to obtain a pretreated steel strip I, and its Ra is detected to be 1.15±0.01μm;

[0096] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent, an enhancer and water in a volume ratio of 2:2:10, the enhancer is obtained by mixing the following raw materials in concentration, including: concentrated sulfuric acid 8g / L, citric acid 24g / L, sodium silicate 7g / L, 4-pentyloxybenzyl alcohol 7g / L, and the solvent is water;

[0097] S12: immersing the pretreated steel strip I in the activation solution at 50° C. for 3 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0098] The activation solution is obtained by mixing the following raw materials with different concentrations, including: 36wt% hydrochloric acid, 8g / L sodium allyl sulfonate;

[0099] S2: first immersing the pretreated steel strip in a nickel plating solution for electroplating treatment, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with a 15 μm thick inner nickel layer to obtain a nickel-plated steel strip I;

[0100] The nickel plating solution is obtained by mixing the following raw materials, including: 270 g / L nickel sulfate, 40 g / L nickel chloride, 40 g / L boric acid, the solvent is water, and ammonia water is added to adjust the pH to 4;

[0101] The process parameters of electroplating treatment are: current density is 6A / dm 2 , the electroplating temperature is 60℃;

[0102] The powder used for plasma spraying is nickel powder;

[0103] The process parameters of plasma spraying treatment are: power 40KW, powder feeding rate 30g / min, argon flow rate 55L / min, hydrogen flow rate 25L / min, spraying distance 100mm;

[0104] S3: Preparation of nickel-plated steel strip II:

[0105] S31: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 5 hours, and then sintering in vacuum at 980° C. and 20 MPa for 4 hours to obtain nickel / titanium carbide / graphene nanomaterials;

[0106] Among them, the mass ratio of graphene, nickel powder and titanium carbide is 0.2:100:0.5;

[0107] S32: using a plasma spraying method to plate a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0108] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 93.8wt% nickel powder, 2.8wt% cobalt powder, 2.2wt% titanium dioxide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0109] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0110] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 88.8wt% nickel powder, 5wt% aluminum powder, 2.2wt% cobalt powder, 1.2wt% titanium dioxide, 0.8wt% tungsten carbide, 0.8wt% silicon carbide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0111] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0112] Based on Example 1, a control experiment is carried out, and comparative examples 1 to 6 are set as follows:

[0113] Comparative Example 1: Comparative Example 1 is based on Example 1, with the following modifications: only KZD-1012 type degreasing agent is used to clean and roughen the 301 type stainless steel strip, and other processes remain unchanged;

[0114] A multi-layer coating process for corrosion-resistant steel strip:

[0115] S1: Preparation of pre-treated steel strip:

[0116] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 45°C for 5 minutes, taken out, rinsed with clean water, dried, and the cleaning and roughening treatments are completed to obtain a pretreated steel strip I, and its Ra is detected to be 0.64±0.01μm;

[0117] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent and water in a volume ratio of 2:10;

[0118] S12: immersing the pretreated steel strip I in the activation solution at 45° C. for 2 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0119] The activation solution is obtained by mixing the following raw materials with different concentrations, including: 36wt% hydrochloric acid, 8g / L sodium allyl sulfonate;

[0120] S2: first immersing the pretreated steel strip in a nickel plating solution for electroplating treatment, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with a 15 μm thick inner nickel layer to obtain a nickel-plated steel strip I;

[0121] The nickel plating solution is obtained by mixing the following raw materials, including: 270 g / L nickel sulfate, 40 g / L nickel chloride, 40 g / L boric acid, the solvent is water, and ammonia water is added to adjust the pH to 4;

[0122] The process parameters of electroplating treatment are: current density is 4A / dm 2 , the electroplating temperature is 55℃;

[0123] The powder used for plasma spraying is nickel powder;

[0124] The process parameters of plasma spraying treatment are: power 35KW, powder feeding rate 25g / min, argon flow rate 50L / min, hydrogen flow rate 22.5L / min, spraying distance 100mm;

[0125] S3: Preparation of nickel-plated steel strip II:

[0126] S31: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 5 hours, and then sintering in vacuum at 980° C. and 20 MPa for 4 hours to obtain nickel / titanium carbide / graphene nanomaterials;

[0127] Among them, the mass ratio of graphene, nickel powder and titanium carbide is 0.1:100:0.4;

[0128] S32: using a plasma spraying method to plate a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0129] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 93.8wt% nickel powder, 2.8wt% cobalt powder, 2.2wt% titanium dioxide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0130] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0131] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 88.8wt% nickel powder, 5wt% aluminum powder, 2.2wt% cobalt powder, 1.2wt% titanium dioxide, 0.8wt% tungsten carbide, 0.8wt% silicon carbide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0132] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0133] Comparative Example 2: Comparative Example 2 is based on Example 1, with the following adjustments: the pre-treated steel strip I is not activated, and other processes remain unchanged, specifically:

[0134] A multi-layer coating process for corrosion-resistant steel strip:

[0135] S1: Preparation of pre-treated steel strip:

[0136] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 45°C for 5 minutes, taken out, rinsed with clean water, dried, and the cleaning and roughening treatment is completed to obtain a pretreated steel strip, and its Ra is detected to be 0.95±0.01μm;

[0137] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent, an enhancer and water in a volume ratio of 2:1.5:10, the enhancer is obtained by mixing the following raw materials in concentration, including: concentrated sulfuric acid 8g / L, citric acid 24g / L, sodium silicate 7g / L, 4-pentyloxybenzyl alcohol 7g / L, and the solvent is water;

[0138] S2: first immersing the pretreated steel strip in a nickel plating solution for electroplating treatment, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with a 15 μm thick inner nickel layer to obtain a nickel-plated steel strip I;

[0139] The nickel plating solution is obtained by mixing the following raw materials, including: 270 g / L nickel sulfate, 40 g / L nickel chloride, 40 g / L boric acid, the solvent is water, and ammonia water is added to adjust the pH to 4;

[0140] The process parameters of electroplating are: current density is 4A / dm 2 , the electroplating temperature is 55℃;

[0141] The powder used for plasma spraying is nickel powder;

[0142] The process parameters of plasma spraying treatment are: power 35KW, powder feeding rate 25g / min, argon flow rate 50L / min, hydrogen flow rate 22.5L / min, spraying distance 100mm;

[0143] S3: Preparation of nickel-plated steel strip II:

[0144] S31: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 5 hours, and then sintering in vacuum at 980° C. and 20 MPa for 4 hours to obtain nickel / titanium carbide / graphene nanomaterials;

[0145] Among them, the mass ratio of graphene, nickel powder and titanium carbide is 0.1:100:0.4;

[0146] S32: using a plasma spraying method to plate a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0147] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 93.8wt% nickel powder, 2.8wt% cobalt powder, 2.2wt% titanium dioxide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0148] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0149] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 88.8wt% nickel powder, 5wt% aluminum powder, 2.2wt% cobalt powder, 1.2wt% titanium dioxide, 0.8wt% tungsten carbide, 0.8wt% silicon carbide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0150] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0151] Comparative Example 3: Comparative Example 3 is based on Example 1, with the following adjustments: no electroplating treatment is performed, and other processes remain unchanged, specifically:

[0152] A multi-layer coating process for corrosion-resistant steel strip:

[0153] S1: Preparation of pre-treated steel strip:

[0154] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 45°C for 5 minutes, taken out, rinsed with clean water, dried, and the cleaning and roughening treatments are completed to obtain a pretreated steel strip I, and its Ra is detected to be 0.95±0.01μm;

[0155] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent, an enhancer and water in a volume ratio of 2:1.5:10, the enhancer is obtained by mixing the following raw materials in concentration, including: concentrated sulfuric acid 8g / L, citric acid 24g / L, sodium silicate 7g / L, 4-pentyloxybenzyl alcohol 7g / L, and the solvent is water;

[0156] S12: immersing the pretreated steel strip I in the activation solution at 45° C. for 2 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0157] The activation solution is obtained by mixing the following raw materials with different concentrations, including: 36wt% hydrochloric acid, 8g / L sodium allyl sulfonate;

[0158] S2: Plating a 15 μm thick inner nickel layer on the pretreated steel strip by plasma spraying to obtain a nickel-plated steel strip I;

[0159] The powder used for plasma spraying is nickel powder;

[0160] The process parameters of plasma spraying treatment are: power 35KW, powder feeding rate 25g / min, argon flow rate 50L / min, hydrogen flow rate 22.5L / min, spraying distance 100mm;

[0161] S3: Preparation of nickel-plated steel strip II:

[0162] S31: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 5 hours, and then sintering in vacuum at 980° C. and 20 MPa for 4 hours to obtain nickel / titanium carbide / graphene nanomaterials;

[0163] Among them, the mass ratio of graphene, nickel powder and titanium carbide is 0.1:100:0.4;

[0164] S32: using a plasma spraying method to plate a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0165] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 93.8wt% nickel powder, 2.8wt% cobalt powder, 2.2wt% titanium dioxide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0166] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0167] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 88.8wt% nickel powder, 5wt% aluminum powder, 2.2wt% cobalt powder, 1.2wt% titanium dioxide, 0.8wt% tungsten carbide, 0.8wt% silicon carbide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0168] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0169] Comparative Example 4: Comparative Example 4 is based on Example 1, with the following adjustments: no nickel / titanium carbide / graphene nanomaterials are added to the plasma spray coating, and other processes remain unchanged, specifically:

[0170] A multi-layer coating process for corrosion-resistant steel strip:

[0171] S1: Preparation of pre-treated steel strip:

[0172] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 45°C for 5 minutes, taken out, rinsed with clean water, dried, and the cleaning and roughening treatments are completed to obtain a pretreated steel strip I, and its Ra is detected to be 0.95±0.01μm;

[0173] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent, an enhancer and water in a volume ratio of 2:1.5:10, the enhancer is obtained by mixing the following raw materials in concentration, including: concentrated sulfuric acid 8g / L, citric acid 24g / L, sodium silicate 7g / L, 4-pentyloxybenzyl alcohol 7g / L, and the solvent is water;

[0174] S12: immersing the pretreated steel strip I in the activation solution at 45° C. for 2 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0175] The activation solution is obtained by mixing the following raw materials with different concentrations, including: 36wt% hydrochloric acid, 8g / L sodium allyl sulfonate;

[0176] S2: first immersing the pretreated steel strip in a nickel plating solution for electroplating treatment, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with a 15 μm thick inner nickel layer to obtain a nickel-plated steel strip I;

[0177] The nickel plating solution is obtained by mixing the following raw materials, including: 270 g / L nickel sulfate, 40 g / L nickel chloride, 40 g / L boric acid, the solvent is water, and ammonia water is added to adjust the pH to 4;

[0178] The process parameters of electroplating are: current density is 4A / dm 2 , the electroplating temperature is 55℃;

[0179] The powder used for plasma spraying is nickel powder;

[0180] The process parameters of plasma spraying treatment are: power 35KW, powder feeding rate 25g / min, argon flow rate 50L / min, hydrogen flow rate 22.5L / min, spraying distance 100mm;

[0181] S3: using a plasma spraying method to coat a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0182] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 95wt% nickel powder, 2.8wt% cobalt powder, and 2.2wt% titanium dioxide; the process parameters of plasma spraying treatment are the same as those of S2;

[0183] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0184] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: nickel powder 90wt%, aluminum powder 5wt%, cobalt powder 2.2wt%, titanium dioxide 1.2wt%, tungsten carbide 0.8wt%, silicon carbide 0.8wt%; the process parameters of plasma spraying treatment are the same as those of S2;

[0185] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0186] Comparative Example 5: Comparative Example 5 is based on Example 1, with the following adjustments: In S3 and S4, no cobalt powder is added to the spray coating material used for the nickel layer plasma spraying treatment, and other processes remain unchanged, specifically:

[0187] A multi-layer coating process for corrosion-resistant steel strip:

[0188] S1: Preparation of pre-treated steel strip:

[0189] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 45°C for 5 minutes, taken out, rinsed with clean water, dried, and the cleaning and roughening treatments are completed to obtain a pretreated steel strip I, and its Ra is detected to be 0.95±0.01μm;

[0190] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent, an enhancer and water in a volume ratio of 2:1.5:10, the enhancer is obtained by mixing the following raw materials in concentration, including: concentrated sulfuric acid 8g / L, citric acid 24g / L, sodium silicate 7g / L, 4-pentyloxybenzyl alcohol 7g / L, and the solvent is water;

[0191] S12: immersing the pretreated steel strip I in the activation solution at 45° C. for 2 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0192] The activation solution is obtained by mixing the following raw materials with different concentrations, including: 36wt% hydrochloric acid, 8g / L sodium allyl sulfonate;

[0193] S2: first immersing the pretreated steel strip in a nickel plating solution for electroplating treatment, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with a 15 μm thick inner nickel layer to obtain a nickel-plated steel strip I;

[0194] The nickel plating solution is obtained by mixing the following raw materials, including: 270 g / L nickel sulfate, 40 g / L nickel chloride, 40 g / L boric acid, the solvent is water, and ammonia water is added to adjust the pH to 4;

[0195] The process parameters of electroplating treatment are: current density is 4A / dm 2 , the electroplating temperature is 55℃;

[0196] The powder used for plasma spraying is nickel powder;

[0197] The process parameters of plasma spraying treatment are: power 35KW, powder feeding rate 25g / min, argon flow rate 50L / min, hydrogen flow rate 22.5L / min, spraying distance 100mm;

[0198] S3: Preparation of nickel-plated steel strip II:

[0199] S31: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 5 hours, and then sintering in vacuum at 980° C. and 20 MPa for 4 hours to obtain nickel / titanium carbide / graphene nanomaterials;

[0200] Among them, the mass ratio of graphene, nickel powder and titanium carbide is 0.1:100:0.4;

[0201] S32: using a plasma spraying method to plate a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0202] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratios, including: 96.6wt% nickel powder, 2.2wt% titanium dioxide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0203] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0204] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratios, including: 91wt% nickel powder, 5wt% aluminum powder, 1.2wt% titanium dioxide, 0.8wt% tungsten carbide, 0.8wt% silicon carbide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0205] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0206] Comparative Example 6: Comparative Example 6 is based on Example 1, with the following adjustments: In S4, no aluminum powder is added, and other processes remain unchanged, specifically:

[0207] A multi-layer coating process for corrosion-resistant steel strip:

[0208] S1: Preparation of pre-treated steel strip:

[0209] S11: The whole coil of 301 stainless steel strip is uncoiled by an uncoiler and straightened by a straightener, and then immersed in an acidic degreasing agent at 45°C for 5 minutes, taken out, rinsed with clean water, dried, and the cleaning and roughening treatments are completed to obtain a pretreated steel strip I, and its Ra is detected to be 0.95±0.01μm;

[0210] The acidic degreasing agent is obtained by mixing KZD-1012 degreasing agent, an enhancer and water in a volume ratio of 2:1.5:10, the enhancer is obtained by mixing the following raw materials in concentration, including: concentrated sulfuric acid 8g / L, citric acid 24g / L, sodium silicate 7g / L, 4-pentyloxybenzyl alcohol 7g / L, and the solvent is water;

[0211] S12: immersing the pretreated steel strip I in the activation solution at 45° C. for 2 min, taking it out, rinsing it with clean water, and drying it to complete the activation treatment, thereby obtaining the pretreated steel strip;

[0212] The activation solution is obtained by mixing the following raw materials with different concentrations, including: 36wt% hydrochloric acid, 8g / L sodium allyl sulfonate;

[0213] S2: first immersing the pretreated steel strip in a nickel plating solution for electroplating treatment, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with a 15 μm thick inner nickel layer to obtain a nickel-plated steel strip I;

[0214] The nickel plating solution is obtained by mixing the following raw materials, including: 270 g / L nickel sulfate, 40 g / L nickel chloride, 40 g / L boric acid, the solvent is water, and ammonia water is added to adjust the pH to 4;

[0215] The process parameters of electroplating are: current density is 4A / dm 2 , the electroplating temperature is 55℃;

[0216] The powder used for plasma spraying is nickel powder;

[0217] The process parameters of plasma spraying treatment are: power 35KW, powder feeding rate 25g / min, argon flow rate 50L / min, hydrogen flow rate 22.5L / min, spraying distance 100mm;

[0218] S3: Preparation of nickel-plated steel strip II:

[0219] S31: adding graphene, nickel powder and titanium carbide into a ball mill and grinding for 5 hours, and then sintering in vacuum at 980° C. and 20 MPa for 4 hours to obtain nickel / titanium carbide / graphene nanomaterials;

[0220] Among them, the mass ratio of graphene, nickel powder and titanium carbide is 0.1:100:0.4;

[0221] S32: using a plasma spraying method to plate a 15 μm thick intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II;

[0222] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 93.8wt% nickel powder, 2.8wt% cobalt powder, 2.2wt% titanium dioxide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0223] S4: using a plasma spraying method to coat a 20 μm thick outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III;

[0224] The powder used for plasma spraying is composed of the following raw materials in the following mass percentage ratio, including: 93.8wt% nickel powder, 2.2wt% cobalt powder, 1.2wt% titanium dioxide, 0.8wt% tungsten carbide, 0.8wt% silicon carbide, and 1.2wt% nickel / titanium carbide / graphene nanomaterials; the process parameters of plasma spraying treatment are the same as those of S2;

[0225] S5: placing the nickel-plated steel sheet III in an argon atmosphere, heating it at 550° C. for 4 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment and obtain a corrosion-resistant steel strip.

[0226] Performance test: The corrosion-resistant steel strips prepared in the above Examples 1 to 3 and Comparative Examples 1 to 6 were subjected to bonding strength test, wear resistance test and corrosion resistance test, as follows:

[0227] (1) Bonding strength test: According to the standard of ASTM C633-79, the bonding strength test is carried out using a universal testing machine;

[0228] (2) Wear resistance test: The wear resistance of each group of corrosion-resistant steel strips was tested using a friction and wear testing machine. The wear load was 196N and the rotation speed was 100r / min. The wear rate after 1000r was measured (wear rate = (weight of sample before test - weight of sample after test) / weight of sample before test);

[0229] (3) Corrosion resistance test: According to the standard of GB / T 10125-2021, at 25°C, add 0.2 g / L of anhydrous cupric chloride to a 50 g / L sodium chloride solution, and adjust the pH to 3.2 to prepare an acidified salt solution; perform a salt spray test on the corrosion-resistant steel strip at 50°C, with a salt spray deposition of 2 mL / 80 cm 2 ·h, the test duration is 200h; the specific test results are shown in Table 1:

[0230]

[0231] Result analysis: From the data in Table 1 above, it can be seen that the present invention obtains a corrosion-resistant steel strip with excellent corrosion resistance and wear resistance by pretreating the steel strip (cleaning + roughening + activation) and combining electroplating and plasma spraying technology.

[0232] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A multi-layer coating process for a corrosion-resistant steel strip, characterized in that: The specific steps include: S1: Steel strip pretreatment: S11: After the whole roll of steel strip raw material is unrolled and straightened in sequence, it is immersed in an acidic degreasing agent at 40-50°C for 2-10 minutes, taken out, cleaned, and dried to obtain a pretreated steel strip I; S12: immersing the pretreated steel strip I in the activation solution at 40-50° C. for 1-3 min, taking out, washing, and drying to obtain the pretreated steel strip; S2: immersing the pretreated steel strip in a nickel plating solution for electroplating, and then plasma spraying the pretreated steel strip, and finally coating the surface of the pretreated steel strip with an inner nickel layer to obtain a nickel-plated steel strip I; In the inner nickel layer, the spraying powder used for plasma spraying is nickel powder; S3: using a plasma spraying method to coat an intermediate nickel layer on the surface of the nickel-plated steel strip I to obtain a nickel-plated steel strip II; In the middle nickel layer, the powder used for plasma spraying includes the following raw materials in the following mass percentage ratios: nickel powder 93-97wt%, cobalt powder 1-4wt%, titanium dioxide 1-3wt%, nickel / titanium carbide / graphene nanomaterial 0.5-1.5wt%; S4: using a plasma spraying method to coat an outer nickel layer on the surface of the nickel-plated steel strip II to obtain a nickel-plated steel strip III; In the outer nickel layer, the powder used for plasma spraying includes the following raw materials in the following mass percentage ratio: nickel powder 87-92wt%, aluminum powder 3-6wt%, cobalt powder 1-3wt%, titanium dioxide 1-2wt%, tungsten carbide 0.5-2wt%, silicon carbide 0.5-2wt%, nickel / titanium carbide / graphene nanomaterial 0.5-2wt%; S5: heat treating the nickel-plated steel strip III to obtain a corrosion-resistant steel strip; The preparation method of the nickel / titanium carbide / graphene nanomaterial is as follows: graphene, nickel powder and titanium carbide are added into a ball mill and ground for 2-10 hours, and then vacuum sintered for 2-6 hours at 950-1000° C. and 15-25 MPa to obtain the nickel / titanium carbide / graphene nanomaterial.

2. A multi-layer coating process for a corrosion-resistant steel strip according to claim 1, characterized in that: In S1, the acidic degreasing agent is obtained by mixing a degreasing agent, an enhancer and water in a volume ratio of 2:(1-2):10; wherein the enhancer comprises the following concentration raw materials: concentrated sulfuric acid 5-10 g / L, citric acid 20-30 g / L, corrosion inhibitor 5-10 g / L, stabilizer 5-10 g / L, and the solvent is water; The activation solution includes the following raw materials in concentrations: 35-37 wt % hydrochloric acid and 5-10 g / L surfactant.

3. The multi-layer coating process for a corrosion-resistant steel strip according to claim 1, characterized in that: The roughness of the pretreated steel strip I is Ra=0.8~1.2μm.

4. The multi-layer coating process for a corrosion-resistant steel strip according to claim 1, characterized in that: In S2, the process parameters of the electroplating treatment are: current density is 2~6A / dm 2 , the electroplating temperature is 50~70℃; the nickel plating solution includes the following raw materials in concentration: 180~300g / L nickel sulfate, 30~50g / L nickel chloride, 30~50g / L boric acid, and the solvent is water; the nickel plating solution uses ammonia water to adjust the pH to 3.5~4.

5.

5. The multi-layer coating process for a corrosion-resistant steel strip according to claim 1, characterized in that: The mass ratio of the graphene, nickel powder and titanium carbide is (0.01-0.2):100:(0.2-0.5), the graphene is in a single-layer sheet with a thickness of 0.5-1.2 nm, the particle size of the nickel powder is 1-5 μm, and the particle size of the titanium carbide is 1-5 μm.

6. The multi-layer coating process for a corrosion-resistant steel strip according to claim 1, characterized in that: In S2, S3, and S4, the process parameters of the plasma spraying treatment are: power of 30-40 kW, powder feeding rate of 20-30 g / min, argon flow rate of 45-55 L / min, hydrogen flow rate of 20-25 L / min, and spraying distance of 90-110 mm.

7. The multi-layer coating process for a corrosion-resistant steel strip according to claim 1, characterized in that: The thickness of the inner nickel layer is 15-20 μm; the thickness of the middle nickel layer is 10-20 μm; and the thickness of the outer nickel layer is 10-20 μm.

8. The multi-layer coating process for a corrosion-resistant steel strip according to claim 1, characterized in that: In S5, the heat treatment process is: placing the nickel-plated steel plate III in an argon atmosphere, heating it at 500-700° C. for 1-5 hours, and after heating, allowing it to cool naturally in the argon atmosphere to complete the heat treatment.

9. A corrosion-resistant steel strip obtained by the multi-layer plating process of the corrosion-resistant steel strip according to any one of claims 1 to 8.

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