Corrosion-resistant nickel-plated steel strip and processing technology thereof

Abstract

The invention relates to the technical field of steel strip machining, in particular to a corrosion-resistant nickel-plated steel strip and a machining process thereof. Low-carbon steel is used as a raw material, acetylene gas with different concentrations is used for carburizing the surface of the low-carbon steel in a high-temperature environment, so that a step-shaped carburizing reinforced layer is formed on the surface of the steel strip, and the phenomenon that stress on the surface and the interior of the steel strip is not uniform after carburizing is effectively avoided; on the basis, a copper layer is further subjected to magnetron sputtering on the surface of the steel plate, the bonding strength between a steel layer and a nickel layer can be effectively improved through introduction of the copper layer, phosphorus is further introduced into nickel liquid during nickel plating, the hardness of a plating layer is effectively improved, and the wear resistance of the plating layer is improved; and on the basis, a heating and tempering procedure is further added after the nickel plating layer is prepared, phosphorus elements in the nickel plating layer can be further diffused to be combined with copper to form a diffusion layer at the high temperature, the corrosion resistance of the copper layer is improved, and therefore protection is further provided.

Description

Technical Field

[0001] The invention relates to the technical field of steel strip processing, in particular to a corrosion-resistant nickel-plated steel strip and a processing technology thereof. Background Art

[0002] In recent years, with the development of new energy technology, electric vehicles have gradually become popular, and batteries as the power source of electric vehicles have also received more and more attention. The battery shell is an important component to protect the internal structure of the battery. Therefore, the quality of the battery shell during use also seriously affects the use status of the battery.

[0003] At present, battery shells are often made of steel strips. However, stainless steel strips with excellent corrosion resistance are limited by their own properties and are not suitable for stamping processes. Therefore, the industry currently uses low-carbon steel as raw material and prepares battery shells after its surface is protected from corrosion. Although this process can greatly improve the processing of the shell, the hardness of low-carbon steel is relatively low, and during the processing, the coating will fall off and peel off with the stamping, affecting the corrosion resistance of the battery shell. Therefore, it is necessary to improve this type of defect. Summary of the invention

[0004] The object of the present invention is to provide a corrosion-resistant nickel-plated steel strip and a processing technology thereof to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: a processing technology for corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0006] S1. The low-carbon alloy steel is hot-rolled and cold-rolled in a four-roll mill, and then polished with 600-800 mesh sandpaper, and then electrolytically decontaminated and pickled, and then the surface is rinsed with deionized water and anhydrous ethanol, and hot-air dried to obtain a steel strip blank;

[0007] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the temperature is raised for carburization, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0008] S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, and the sputtering deposition rate is 0.05-0.1nm / s. After the sputtering is completed, a copper layer is formed on the surface of the pretreated steel strip blank, and the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer on the surface of the pretreated steel strip blank;

[0009] S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 350-400°C in a nitrogen atmosphere, tempered for 1-1.5 hours, and then cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0010] Furthermore, in step S1, during electrolytic decontamination, the low carbon steel is energized and placed in an alkaline solution for electrolysis for 2-3 minutes; the voltage intensity is 7-8V, and the electrolytic alkaline solution contains 20-40g / L of sodium hydroxide, 8-12g / L of sodium silicate, 20-40g / L of sodium phosphate, and 15-30g / L of sodium carbonate.

[0011] Furthermore, in step S1, during pickling, the acid solution used is a nitric acid solution with a concentration of 8-10wt%.

[0012] Furthermore, in step S2, when carburizing by heating, the acetylene pressure is controlled to be 0.01-0.03MPa, and the temperature is raised to 350-400°C and kept for 1-1.5h, and then the temperature is raised to 900-1000°C again, and after keeping for 0.5h, the acetylene pressure is adjusted to 0.03-0.05MPa, and kept for 0.5-1h, and the acetylene pressure is adjusted to 0.05-0.1MPa again, and after keeping for 1-1.5h, the carburizing by heating is completed and the heating is stopped.

[0013] Furthermore, in step S3, the copper layer has a thickness of 80-200 nm; and the nickel-plated layer has a thickness of 2.5-3.5 μm.

[0014] Furthermore, in step S3, the nickel solution used for nickel plating contains 100-120 g / L of nickel sulfate, 30-35 g / L of boric acid, 15-20 g / L of nickel chloride, 35-45 g / L of phosphoric acid, and 0.1-0.15 g / L of sodium dodecyl sulfate.

[0015] Furthermore, in step S2, during nickel plating, the nickel solution temperature is 45-50°C and the current density is 3-12A / dm 2 .

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention uses low carbon steel as raw material, and utilizes the characteristics of low carbon steel itself that it is soft and easy to process, thereby facilitating the subsequent processing process; at the same time, on this basis, the present invention performs carburizing treatment on the low carbon steel. Using acetylene gas of different concentrations, the surface of the low carbon steel is carburized in a high temperature environment. In a low concentration acetylene gas environment, the surface of the steel strip will be initially carburized to form an iron carbide strengthening layer. Then, in a subsequent high concentration acetylene gas environment, these iron carbide strengthening layers will be further strengthened in the acetylene gas environment and organize the acetylene gas to further carburize the inside of the steel strip, thereby eventually forming a stepped carburized strengthening layer with a high degree of carburization on the outer layer and a low degree of carburization on the inner layer, thereby effectively avoiding the uneven stress phenomenon on the surface and inside of the steel strip caused by carburizing;

[0018] Then, on this basis, the present invention also performs magnetron sputtering of a copper layer on the surface. The introduction of the copper layer can effectively improve the bonding strength between the steel layer and the nickel layer. In addition, during the nickel plating process, due to the presence of hydrogen ions in the electroplating solution, hydrogen ions will be formed on the metal surface of the steel layer during electroplating, thereby causing hydrogen embrittlement. The introduction of the copper layer can effectively hinder the intrusion of hydrogen, reduce the risk of hydrogen embrittlement, and improve the stability of the coating.

[0019] Afterwards, the present invention also introduces phosphorus into the nickel solution during nickel plating, and then phosphorus can be introduced into the surface of the steel strip during electroplating of nickel. The introduction of phosphorus can effectively improve the hardness of the coating and enhance its wear resistance; and on this basis, the present invention further adds a temperature rising and tempering procedure after preparing the nickel plating layer. At high temperature, the phosphorus element in the nickel plating layer will further diffuse and combine with copper to form a diffusion layer, and improve the corrosion resistance of the copper layer, thereby providing further protection behind the nickel plating layer. DETAILED DESCRIPTION

[0020] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0021] The low carbon steel used in this application is Q195 low carbon steel;

[0022] Embodiment 1. A process for processing a corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0023] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0024] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the acetylene pressure is controlled to be 0.01 MPa, the temperature is raised to 380°C, and after being kept at this temperature for 1 hour, the temperature is raised to 950°C again, and after being kept at this temperature for 0.5 hour, the acetylene pressure is adjusted to 0.03 MPa, and the temperature is kept at this temperature for 0.5 hour, and the acetylene pressure is adjusted to 0.05 MPa again, and after being kept at this temperature for 1 hour, the carburizing is completed, the heating is stopped, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0025] S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, the sputtering deposition rate is 0.1 nm / s, and after the sputtering is completed, a copper layer with a thickness of 85±1 nm is formed on the surface of the pretreated steel strip blank, and then the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer with a thickness of 3 μm on the surface of the pretreated steel strip blank;

[0026] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm 2 ;

[0027] S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 380°C in a nitrogen atmosphere. After heat preservation and tempering for 1 hour, it is cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0028] Embodiment 2. A processing technology for corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0029] Compared with Example 1, this embodiment increases the acetylene gas pressure at each stage in step S2;

[0030] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0031] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the acetylene pressure is controlled to be 0.02MPa, the temperature is raised to 380°C, and after being kept at this temperature for 1h, the temperature is raised to 950°C again, and after being kept at this temperature for 0.5h, the acetylene pressure is adjusted to 0.04MPa, and the temperature is kept at this temperature for 0.5h. The acetylene pressure is adjusted to 0.07MPa again, and after being kept at this temperature for 1h, the carburizing is completed, the heating is stopped, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0032] S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, the sputtering deposition rate is 0.1 nm / s, and after the sputtering is completed, a copper layer with a thickness of 85±1 nm is formed on the surface of the pretreated steel strip blank, and then the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer with a thickness of 3 μm on the surface of the pretreated steel strip blank;

[0033] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm 2 ;

[0034] S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 380°C in a nitrogen atmosphere. After heat preservation and tempering for 1 hour, it is cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0035] Embodiment 3. A processing technology for corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0036] Compared with Example 1, this embodiment increases the pressure of the acetylene gas in step S2;

[0037] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0038] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the acetylene pressure is controlled to be 0.03MPa, the temperature is raised to 380°C, and after being kept at this temperature for 1h, the temperature is raised to 950°C again, and after being kept at this temperature for 0.5h, the acetylene pressure is adjusted to 0.05MPa, and the temperature is kept at this temperature for 0.5h. The acetylene pressure is adjusted to 0.1MPa again, and after being kept at this temperature for 1h, the carburizing is completed, the heating is stopped, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0039] S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, the sputtering deposition rate is 0.1 nm / s, and after the sputtering is completed, a copper layer with a thickness of 85±1 nm is formed on the surface of the pretreated steel strip blank, and then the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer with a thickness of 3 μm on the surface of the pretreated steel strip blank;

[0040] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm 2 ;

[0041] S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 380°C in a nitrogen atmosphere. After heat preservation and tempering for 1 hour, it is cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0042] Embodiment 4. A processing technology for corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0043] Compared with Example 1, the present embodiment increases the thickness of the copper layer in step S3;

[0044] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0045] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the acetylene pressure is controlled to be 0.01 MPa, the temperature is raised to 380°C, and after being kept at this temperature for 1 hour, the temperature is raised to 950°C again, and after being kept at this temperature for 0.5 hour, the acetylene pressure is adjusted to 0.03 MPa, and the temperature is kept at this temperature for 0.5 hour, and the acetylene pressure is adjusted to 0.05 MPa again, and after being kept at this temperature for 1 hour, the carburizing is completed, the heating is stopped, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0046] S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, the sputtering deposition rate is 0.1 nm / s, and after the sputtering is completed, a copper layer with a thickness of 180±1 nm is formed on the surface of the pretreated steel strip blank, and then the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer with a thickness of 3 μm on the surface of the pretreated steel strip blank;

[0047] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm 2 ;

[0048] S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 380°C in a nitrogen atmosphere. After heat preservation and tempering for 1 hour, it is cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0049] Embodiment 5. A process for processing a corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0050] Compared with Example 1, this embodiment increases the insulation and tempering time in step S4;

[0051] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0052] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the acetylene pressure is controlled to be 0.01 MPa, the temperature is raised to 380°C, and after being kept at this temperature for 1 hour, the temperature is raised to 950°C again, and after being kept at this temperature for 0.5 hour, the acetylene pressure is adjusted to 0.03 MPa, and the temperature is kept at this temperature for 0.5 hour, and the acetylene pressure is adjusted to 0.05 MPa again, and after being kept at this temperature for 1 hour, the carburizing is completed, the heating is stopped, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0053] S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, the sputtering deposition rate is 0.1 nm / s, and after the sputtering is completed, a copper layer with a thickness of 85±1 nm is formed on the surface of the pretreated steel strip blank, and then the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer with a thickness of 3 μm on the surface of the pretreated steel strip blank;

[0054] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm 2 ;

[0055] S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 380°C in a nitrogen atmosphere. After heat preservation and tempering for 1.5 hours, it is cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0056] Embodiment 6. A process for processing a corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0057] Compared with Example 3, this embodiment further increases the insulation time in step S2;

[0058] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0059] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the acetylene pressure is controlled to be 0.03MPa, the temperature is raised to 380°C, and after being kept at this temperature for 1.5h, the temperature is raised to 950°C again, and after being kept at this temperature for 0.5h, the acetylene pressure is adjusted to 0.05MPa, and the temperature is kept at this temperature for 1h. The acetylene pressure is adjusted to 0.1MPa again, and after being kept at this temperature for 1.5h, the carburizing is completed, the heating is stopped, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0060] S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, the sputtering deposition rate is 0.1 nm / s, and after the sputtering is completed, a copper layer with a thickness of 85±1 nm is formed on the surface of the pretreated steel strip blank, and then the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer with a thickness of 3 μm on the surface of the pretreated steel strip blank;

[0061] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm 2 ;

[0062] S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 380°C in a nitrogen atmosphere. After heat preservation and tempering for 1 hour, it is cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0063] Comparative Example 1. A processing technology for corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0064] Compared with Example 1, this comparative example does not perform step S12 processing;

[0065] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0066] S2. magnetron sputtering is performed on the surface of the steel strip blank under argon atmosphere protection, the magnetron sputtering target is copper, the sputtering deposition rate is 0.1 nm / s, and after the sputtering is completed, a copper layer with a thickness of 85±1 nm is formed on the surface of the steel strip blank, and then the steel strip blank is subjected to nickel plating treatment in a system electroplating solution to form a nickel plating layer with a thickness of 3 μm on the surface of the steel strip blank;

[0067] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm 2 ;

[0068] S4. The surface of the nickel-plated steel strip is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 380°C in a nitrogen atmosphere. After heat preservation and tempering for 1 hour, it is cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0069] Comparative Example 2. A processing technology for a corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0070] Compared with Example 1, in step S3 of this comparative example, no copper layer is magnetron sputtered;

[0071] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0072] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the acetylene pressure is controlled to be 0.01 MPa, the temperature is raised to 380°C, and after being kept at this temperature for 1 hour, the temperature is raised to 950°C again, and after being kept at this temperature for 0.5 hour, the acetylene pressure is adjusted to 0.03 MPa, and the temperature is kept at this temperature for 0.5 hour, and the acetylene pressure is adjusted to 0.05 MPa again, and after being kept at this temperature for 1 hour, the carburizing is completed, the heating is stopped, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0073] S3. The pretreated steel strip body is subjected to nickel plating in a plating solution to form a nickel-plated layer having a thickness of 3 μm on the surface of the pretreated steel strip body;

[0074] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm2 ;

[0075] S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 380°C in a nitrogen atmosphere. After heat preservation and tempering for 1 hour, it is cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

[0076] Comparative Example 3. A processing technology for a corrosion-resistant nickel-plated steel strip, comprising the following steps:

[0077] S1. After hot rolling and cold rolling of low carbon alloy steel in a four-roll mill, the steel was polished with 800-mesh sandpaper, and then electrolyzed in an alkaline solution for decontamination. The voltage was 8V, and the alkaline solution contained 25g / L sodium hydroxide, 10g / L sodium silicate, 30g / L sodium phosphate, and 15g / L sodium carbonate. After electrolysis for 3 minutes, the surface of the low carbon alloy steel was pickled with a nitric acid solution with a concentration of 8wt%, and then the surface was rinsed with deionized water and anhydrous ethanol, and hot air dried to obtain a steel strip blank;

[0078] S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the acetylene pressure is controlled to be 0.01 MPa, the temperature is raised to 380°C, and after being kept at this temperature for 1 hour, the temperature is raised to 950°C again, and after being kept at this temperature for 0.5 hour, the acetylene pressure is adjusted to 0.03 MPa, and the temperature is kept at this temperature for 0.5 hour, and the acetylene pressure is adjusted to 0.05 MPa again, and after being kept at this temperature for 1 hour, the carburizing is completed, the heating is stopped, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank;

[0079] S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, the sputtering deposition rate is 0.1 nm / s, and after the sputtering is completed, a copper layer with a thickness of 85±1 nm is formed on the surface of the pretreated steel strip blank, and then the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer with a thickness of 3 μm on the surface of the pretreated steel strip blank;

[0080] During nickel plating, the nickel solution contains 100g / L nickel sulfate, 30g / L boric acid, 15g / L nickel chloride, 40g / L phosphoric acid, and 0.1g / L sodium dodecyl sulfate. The nickel solution temperature is 48°C and the electroplating current is 4A / dm 2 After the electroplating is completed, the surface is cleaned and dried to obtain a corrosion-resistant nickel-plated steel strip.

[0081] Test: The corrosion resistance of the steel strips prepared in Examples 1-6 and Comparative Examples 1-3 was tested according to GB / T 6461-2002. The test conditions were as follows: the steel strips were placed in an environment of 35°C and 95% relative humidity, and a 50 g / L sodium chloride solution was continuously sprayed on the surface of the steel strips at a spray rate of 1.5 mL / h·cm 2 , the spraying time is 8h;

[0082] The steel strips prepared in Examples 1-6 and Comparative Examples 1-3 were folded three times in succession, each folding angle was 90°, and after the folding was completed, the corrosion resistance was tested again;

[0083] According to QB / T 3822, the microhardness of the steel strips prepared in Examples 1-6 and Comparative Examples 1-3 was tested using a microhardness tester;

[0084] The mechanical properties of the steel strips of Examples 1-6 and Comparative Examples 1-3 were tested using a tensile testing machine, and they were characterized according to GB / T5027-2016, and their plastic strain ratios were tested;

[0085] The test results are shown in the table below;

[0086]

[0087] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A processing technology for corrosion-resistant nickel-plated steel strip, characterized in that: The following steps are involved: S1. The low-carbon alloy steel is hot-rolled and cold-rolled in a four-roll mill, and then polished with 600-800 mesh sandpaper, and then electrolytically decontaminated and pickled, and then the surface is rinsed with deionized water and anhydrous ethanol, and hot-air dried to obtain a steel strip blank; S2. The steel strip blank is placed in a vacuum environment, acetylene gas is introduced therein, the temperature is raised for carburization, and the steel strip blank is cooled to room temperature with the furnace to obtain a pretreated steel strip blank; S3. Under argon atmosphere protection, magnetron sputtering is performed on the surface of the pretreated steel strip blank, the magnetron sputtering target is copper, and the sputtering deposition rate is 0.05-0.1nm / s. After the sputtering is completed, a copper layer is formed on the surface of the pretreated steel strip blank, and the pretreated steel strip blank is subjected to nickel plating in a plating solution to form a nickel plating layer on the surface of the pretreated steel strip blank; S4. The surface of the pretreated steel strip after nickel plating is cleaned with ultrapure water and anhydrous ethanol, dried, and then heated to 350-400°C in a nitrogen atmosphere, tempered for 1-1.5 hours, and then cooled to room temperature to obtain a corrosion-resistant nickel-plated steel strip.

2. The processing technology of a corrosion-resistant nickel-plated steel strip according to claim 1, characterized in that: In step S1, during electrolytic decontamination, the low carbon steel is energized and placed in an alkaline solution for electrolysis for 2-3 minutes; the voltage intensity is 7-8V, and the electrolytic alkaline solution contains 20-40g / L of sodium hydroxide, 8-12g / L of sodium silicate, 20-40g / L of sodium phosphate, and 15-30g / L of sodium carbonate.

3. The processing technology of the corrosion-resistant nickel-plated steel strip according to claim 1 is characterized in that: In step S1, during pickling, the acid solution used is a nitric acid solution with a concentration of 8-10wt%.

4. The processing technology of a corrosion-resistant nickel-plated steel strip according to claim 1, characterized in that: In step S2, when the temperature is increased for carburizing, the acetylene pressure is controlled to be 0.01-0.03MPa. After the temperature is increased to 350-400°C and kept for 1-1.5h, the temperature is increased to 900-1000°C again, and after keeping for 0.5h, the acetylene pressure is adjusted to 0.03-0.05MPa, and kept for 0.5-1h. The acetylene pressure is adjusted to 0.05-0.1MPa again, and after keeping for 1-1.5h, the temperature increase carburizing is completed and the heating is stopped.

5. The processing technology of the corrosion-resistant nickel-plated steel strip according to claim 1 is characterized in that: In step S3, the copper layer has a thickness of 80-200 nm; and the nickel-plated layer has a thickness of 2.5-3.5 μm.

6. The processing technology of the corrosion-resistant nickel-plated steel strip according to claim 1, characterized in that: In step S3, the nickel solution used for nickel plating contains 100-120 g / L of nickel sulfate, 30-35 g / L of boric acid, 15-20 g / L of nickel chloride, 35-45 g / L of phosphoric acid, and 0.1-0.15 g / L of sodium dodecyl sulfate.

7. The processing technology of the corrosion-resistant nickel-plated steel strip according to claim 1 is characterized in that: In step S2, during nickel plating, the nickel solution temperature is 45-50°C and the current density is 3-12A / dm 2 .

8. A corrosion-resistant nickel-plated steel strip produced by the processing technology described in any one of claims 1 to 7.

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