CN1861389A - High precision composite nickel steel band and its prodn. technique - Google Patents
High precision composite nickel steel band and its prodn. technique Download PDFInfo
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Abstract
A high-accuracy composite Ni-steel band used as the shell of rechargeable high-energy battery and ordinary battery is made up of cold rolled steel band through acid washing, cold rolling, cutting for removing edges, degreasing, heat treating, flattening, stretching, plating Ni layer, annealing for diffusion, flattening and dividing by needed sizes.
Description
Technical Field
The invention relates to a high-precision nickel composite steel strip and a production process thereof. In particular to a steel shell material which is widely used in high-energy rechargeable batteries and common civil batteries, belonging to the technical field of battery steel shell substrate materials.
Background
The shape of the battery can be divided into various special-shaped batteries such as a cylindrical shape, a flat plate shape and a button shape, wherein the cylindrical shape is most used in use. The cylindrical battery can be divided into a high-energy rechargeable battery and a common household battery. The most basic materials are required to manufacture these batteries: a battery case. The battery case is made of a nickel-plated steel strip. The battery shell is produced through drawing and punching deep drawing steel plate into steel shell and electroplating one layer of nickel on the steel shell, and this process has the demerits of uneven nickel layer, hard plating of sufficient nickel layer on the bottom of the cylinder, loose nickel layer, low corrosion resistance and serious influence on the use performance of the battery. For example, the foot part and the weld part of the steel shell for the high-energy battery can not be plated with nickel to expose iron, thereby causing self-discharge or being incapable of charging and being discarded.
Disclosure of Invention
The invention aims to overcome the defects, so that the low-carbon steel hot-rolled steel strip is used as a raw material, a four-roller mill is adopted for cold rolling, and the optimal processes of rolling, degreasing, nickel electroplating, heat treatment, leveling and the like are searched, so that the mechanical properties of the steel strip required by deep drawing and deep stamping forming are achieved; after the battery shell is formed by drawing and punching, the nickel layer is uniform and consistent, and the high-precision nickel composite steel strip has extremely high corrosion resistance and a production process thereof.
The main solution of the invention is realized as follows:
the invention adopts a coil stock with a coiled structure formed by coiling a cold-rolled steel strip from inside to outside, and is characterized in that one side or two sides of the cold-rolled steel strip are respectively plated with nickel on a continuous production line, and the thickness of the steel strip is as follows: 0.10-0.50 mm, width: 100-550 mm. The thickness of the nickel plating layer is as follows: 0.5 to 8 mu. (the nickel layers on both sides can be of equal thickness or different thicknesses)
The invention mainly adopts the following process steps:
1. the method comprises the following steps of firstly carrying out acid pickling treatment on the thickness of a hot rolled steel strip coil raw material of 1.8-3.2mm, and heating acid liquor, wherein the heating temperature is as follows: the pickling speed is about 70-80 degrees centigrade: 10-20 m/min;
2. rolling the pickled steel strip by adopting a four-high mill, and cold-rolling the emulsion for lubricating and cooling agent for 9-11 times to obtain the steel strip with the thickness: 0.15-0.50 mm; the four high millspeed is: 200-400 m/min;
3. the cold-rolled steel strip is subjected to edge cutting, degreasing and coil loosening treatment, wherein the degreasing speed is as follows: 70-80 m/min;
4. carrying out heat treatment on the degreased cold-rolled steel strip, adopting 25% N2+ 75% H2 of nitrogen-hydrogen protective gas to prevent the surface of the steel strip from being oxidized, washing the steel strip by using nitrogen and vacuumizing, completely exhausting air in the steel strip, heating at the speed of 45-55 ℃ per hour, keeping the temperature for 3-5 hours when the temperature is raised to 400-500 ℃, then continuously raising the temperature to 580-690 ℃, keeping the temperature for 11-16 hours, then powering off and cooling to 520-580 ℃, uncovering a heating cover, air cooling to 320-380 ℃, and water cooling to 70-80 ℃ to take the steel strip out of the furnace;
5. the cold-rolled steel strip after heat treatment is leveled, a leveling roller (a roughening roller) is adopted, and the roughness is as follows: 0.6-0.8 μm, convexity: 0.05-0.07 mm, leveling and then stretching, bending and straightening, wherein the tension in the stretching and straightening process is as follows: 280-320 Mpa at a speed of: 80-100 m/min;
6. and (3) performing nickel electroplating after stretching and straightening:
(1) chemical oil removal: chemically degreasing the steel strip after stretching and straightening, and spraying and washing; the oil removing powder is taken as follows: preparing an oil removing powder solution by 60-70 g/L, and heating the oil removing powder solution at the temperature of: 70-85 ℃; the oil removal speed is as follows: 80-100 m/min;
(2) and electrolytic degreasing: carrying out electrolytic degreasing on the steel strip subjected to spray rinsing, and scrubbing;the electrolytic degreasing solution is prepared by sodium hydroxide and water, wherein the sodium hydroxide is as follows: 2-4 wt%, the balance being water; and heating the electrolytic solution at the temperature: 70-85 ℃; current: 3000A; the electrolytic degreasing speed is as follows: 80-100 m/min;
(3) acid washing: and carrying out acid washing and brushing on the steel strip which is subjected to electrolytic degreasing and brushing. The acid washing solution is prepared by hydrochloric acid and water, wherein the hydrochloric acid is as follows: 3-9 wt%, the balance being water; the pickling speed is as follows: 80-100 m/min; the working temperature is room temperature, and heating is not needed;
(4) electroplating nickel on the steel strip subjected to acid washing and scrubbing, wherein the formula of the electroplating solution for the nickel-plating layer comprises the following components: in grams/liter: nickel sulfamate is: 300-450, sodium chloride is: 20-25, boric acid is: 25-32, pH: 4 to 5.5; the temperature of the electroplating solution is as follows: at 40-55 ℃, the current density is as follows: 5-25 amperes/dm 2; the thickness of the nickel plating layer is as follows: 0.5-8 mu;
(5) after nickel electroplating, spraying and washing are carried out;
(6) and drying the steel strip after spraying and washing, wherein the drying temperature is as follows: 120-140 ℃; performing electrostatic oiling on the dried nickel-plated steel strip, wherein the oiling amount is 2-6 mg/m 2;
7. the steel strip is subjected to nickel plating and then enters diffusion annealing treatment, nitrogen-hydrogen protective gas 25% N2+ 75% H2 is used in the diffusion annealing treatment, then the temperature is raised at the speed of 45-55 ℃ per hour, the temperature is raised to 590-610 ℃, the temperature is kept for 10-12 hours, then the power is cut off, the steel strip is cooled to 520-580 ℃, a heating cover is hung, the steel strip is cooled to 320-380 ℃ along with the furnace, and the steel strip is cooled to 70-80 ℃ by water and taken out of the furnace;
8. and flattening and cutting the nickel-plated steel strip subjected to the diffusion annealing treatment to obtain a finished product.
Compared with the prior art, the invention has the following advantages:
the invention has simple manufacturing process, can reduce the production cost, and has simpler post-treatment of products; the four-high mill is adopted for cold rolling, the mechanical properties of the steel strip required by deep drawing and deep drawing forming are achieved through an advanced nickel electroplating process, after the steel strip is drawn and pressed into a battery shell, the nickel layer is uniform and consistent, the corrosion resistance is extremely high, the method is suitable for industrial production, and the urgent need of high-performance materials of high-energy batteries, automobiles, computers and the like at home and abroad is solved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
the first embodiment is as follows:
the invention selects hot rolling strip blank coil stock with the thickness as follows: 1.8-3.2mm, and the length is determined according to the requirement of a client. The thickness of the cold-rolled steel strip after cold rolling is as follows: 0.15-0.5 mm, width is: 100-550 mm.
The invention adopts the following process steps:
1. the method comprises the following steps of carrying out acid cleaning treatment on a hot rolled strip blank roll raw material, wherein the concentration of an acid cleaning medium is not lower than 15% by adopting hydrochloric acid aqueous solution, and heating acid solution by using steam at the temperature: the pickling speed is controlled according to the cleanliness of the surface of the steel strip at about 70 ℃, and is generally 15 m/min, so that the oxide skin on the surface of the steel strip can be washed away to the maximum extent;
2. the number of passes and the thickness of the hot rolled strip are selected based on the user's requirements for the physical properties of the finished strip and the thickness of the final product. The rolling is carried out on a four-roller rolling mill, the thickness of a hot rolled strip is rolled from 1.8-3.2mm to 0.15-0.5 mm, the total reduction rate reaches more than 90%, and in order to ensure the cleanliness of the surface of a finished steel strip and reduce the pollution to a lubricating coolant of a rolling process as much as possible, an emulsion is adopted in the rolling process, and the volume concentration of the emulsion is selected as follows: 4-6%, and the pH value is: 7-8, and preparing the oil of the emulsion by using a QUAKROLL II number. The four high mill speed is: 200 m/min, and then degreasing;
3. in order to ensure the cleanness of the surface of the steel strip and no bonding during annealing, the cold-rolled steel strip is subjected to trimming, degreasing and coil loosening treatment, wherein the degreasing is carried out on a continuous line through a metal surface detergent solutiontank → a water washing tank → a NaOH alkaline tank and electrolytic degreasing → clean water washing → brushing → drying → recoiling. The volume concentration of the cleaning agent solution is as follows: 7-8%, and NaOH solution: 35-45%, and the solution temperature is: 65-75 ℃, and the drying temperature is as follows: the degreasing speed is as follows at 100 ℃: 70 m/min;
4. the cold-rolled steel strip after large reduction ratio is subjected to heat treatment to recover the processability, and in order to ensure that the surface of the steel strip is not oxidized and keeps bright, 25 percent of N2+ is protected by nitrogen-hydrogen protective gas75% H2, the nitrogen-hydrogen protective gas is obtained by decomposing liquid ammonia at about 800 deg.C, and Ni is used as catalyst . In order to ensure that good processing performance is obtained after annealing, the furnace is washed by using nitrogen and vacuumizing after charging, the air in the furnace is completely exhausted, then the temperature is raised at the speed of 45 ℃ per hour, the temperature is kept for 3 hours when the temperature is raised to 400 ℃, then the temperature is continuously raised to 600 ℃ and kept for 11 hours, then the power is cut off, the temperature is lowered to 520 ℃, a heating cover is uncovered, the air is cooled to 320 ℃, and the furnace is taken out after the water is cooled to 70 ℃;
5. the cold-rolled steel strip after heat treatment is leveled, a leveling roller (a roughening roller) is adopted, and the roughness is as follows: 0.6 μm; the convexity is as follows: 0.07mm, leveling and then stretching, bending and straightening, wherein the tension in the stretching and straightening process is as follows: 280Mpa, speed: 80 m/min; the steel strip after the pulling and straightening treatment becomes more straight.
6. And (3) performing nickel electroplating after stretching and straightening:
(1) chemical oil removal: chemically degreasing the steel strip after stretching and straightening, and spraying and washing; the oil removing powder is taken as follows: preparing an oil removing powder solution by 60 g/L, and heating the oil removing powder solution at the temperature of: 70 ℃; the oil removal speed is as follows: 80 m/min;
(2) and electrolytic degreasing: carrying out electrolytic degreasing on the steel strip subjected to spray rinsing, and scrubbing; preparing 3 weight percent of sodium hydroxide and the balance of water into an electrolytic solution; and heating the electrolytic solution at the temperature: 70 ℃; current: 3000A; the electrolytic degreasing speed is as follows: 80 m/min;
(3) acid washing: carrying out acid washing and scrubbing on the steel strip which is subjected to electrolytic degreasing and scrubbing, and preparing acid washing solution by taking 3 wt% of hydrochloric acid and the balance of water; the pickling speed is as follows: 80 m/min;
(4) carrying out double-sided nickel electroplating on the steel strip after acid washing and scrubbing, wherein the formula of the nickel plating electroplating solution comprises the following components: in grams/liter: nickel sulfamate is: 300. the sodium chloride is: 20. the boric acid is: 28; the nickel plating layer temperature is: 42 ℃ and current density: 10 amperes/dm 2; the thickness of the nickel plating layer is as follows: 2.4 mu;
(5) after nickel plating, spraying and washing are carried out;
(6) and drying the steel strip after spraying and washing, wherein the drying temperature is as follows: 120 ℃; and (3) electrostatically oiling the dried nickel-plated steel strip by adopting DOS oil, wherein the oiling amount is asfollows: 2mg/m 2;
7. the steel strip is subjected to nickel plating and then enters diffusion annealing treatment, nitrogen-hydrogen protective gas 25% N2+ 75% H2 is used for the diffusion annealing treatment, then the temperature is raised at the speed of 45 ℃ per hour, when the temperature is raised to 590 ℃, the temperature is kept for 10 hours, then the power is cut off, the steel strip is cooled to 520 ℃, a heating cover is hung, and the steel strip is cooled to 320 ℃ along with the furnace, is cooled to 70 ℃ by water and is taken out of the furnace;
8. and flattening and cutting the nickel-plated steel strip subjected to the diffusion annealing treatment to obtain a finished product. And the cutting is to be sent to the user after being subjected to strip packaging according to the using width required by the user.
Example two
The invention selects hot rolling strip blank coil stock with the thickness as follows: 1.8-3.2mm, and the length is determined according to the requirement of a client. The thickness of the cold-rolled steel strip after cold rolling is as follows: 0.15-0.50 mm, width: 100-550 mm.
The invention adopts the following process steps:
1. the method comprises the following steps of carrying out acid cleaning treatment on a hot rolled strip blank roll raw material, wherein the concentration of an acid cleaning medium is not lower than 15% by adopting hydrochloric acid aqueous solution, and heating acid solution by using steam at the temperature: controlling the pickling speed according to the cleanliness of the surface of the steel strip at about 75 ℃, wherein the pickling speed is generally 15 m/min;
2. carrying out cold rolling after acid pickling treatment, carrying out cold rolling on a four-roller rolling mill, rolling the thickness of a hot rolled strip from 1.8-3.2mm to 0.15-0.50 mm, wherein the total reduction rate is more than 90%, the rolling process adopts emulsion, and the volume concentration of the emulsion is selected as follows: 4-6%, and the pH value is: the oil used to prepare the emulsion is QUAK ROLL II. The four high mill speed is: 300 m/min;
3. the cold-rolled steel strip is subjected to edge cutting, degreasing and coil loosening treatment, wherein the degreasing is performed on a continuous line, and the degreasing speed is as follows: 75 m/min;
4. in order to ensure that the surface of a steel strip is not oxidized and keeps bright, nitrogen-hydrogen protective gas 25% N2+ 75% H2 is used, in order to ensure that good processing performance is obtained after annealing, nitrogen and vacuumizing are used for washing the furnace after charging, the air in the furnace is completely exhausted, then the temperature is increased at the speed of 50 ℃ per hour, the temperature is kept for 4 hours when the temperature is increased to 450 ℃, then the temperature is continuously increased to 610 ℃ and kept for 12 hours, then the power is cut off and the temperature is reduced to 550 ℃, a heating cover is uncovered, air is cooled to 350 ℃, and water is cooled to 75 ℃ to be discharged from the furnace;
5. leveling the cold-rolled steel strip after heat treatment, wherein a roughening roller is adopted as a leveling roller, and the roughness is as follows: 0.7um, convexity is: 0.07mm, leveling and then stretching, bending and straightening, wherein the tension in the stretching and straightening process is as follows: 300Mpa, speed: 90 m/min;
6. and (3) performing nickel electroplating after stretching and straightening:
(1) chemical oil removal: chemically degreasing the steel strip after stretching and straightening, and spraying and washing; the oil removing powder is taken as follows: preparing an oil removing powder solution by 65 g/L, and heating the oil removing powder solution at the temperature of: 75 ℃; the oil removal speed is as follows: 90 m/min;
(2) and electrolytic degreasing: carrying out electrolytic degreasing on the steel strip subjected to spray rinsing, and scrubbing; preparing electrolytic degreasing liquid by taking 3 weight percent of sodium hydroxide and the balance of water; and heating the electrolytic solution at the temperature: 75 ℃; current: 3000A; the electrolytic degreasing speed is as follows: 90 m/min;
(3) acid washing: carrying out acid washing on the steel strip which is electrolytically degreased and scrubbed, and preparing acid washing solution by taking 5 weight percent of hydrochloric acid and the balance of water; the pickling speed is as follows: 90 m/min;
(4) the front 2 and the back 3 of the steel strip 1 after acid cleaning and scrubbing are respectively plated with nickel layers, and the formula of the electroplating solution of the nickel layers comprises: in grams/liter: nickel sulfamate is: 380. the sodium chloride is: 23. the boric acid is: 28; the temperature of the nickel plating solution is as follows: at 50 ℃, the current density is: 15 amperes/dm 2; the thickness of the nickel plating layer is as follows: 3.5 mu;
(5) after nickel plating, spraying and washing are carried out;
(6) and drying the steel strip after spraying and washing, wherein the drying temperature is as follows: 130 ℃; electrostatically oiling the dried nickel-plated steel strip by using DOS oil, wherein the oiling amount is 4mg/m 2;
7. the steel strip is subjected to diffusion annealing treatment after being plated with a nickel layer, the diffusion annealing treatment uses nitrogen-hydrogen protective gas 25%N2+ 75% H2, then the temperature is raised at the speed of 50 ℃ per hour, when the temperature is raised to 500 ℃, the power is cut off after the temperature is kept for 11 hours, the steel strip is cooled to 550 ℃, a heating cover is hung, and the steel strip is cooled to 350 ℃ along with the furnace, is cooled to 75 ℃ by water and is taken out of the furnace;
8. and flattening and cutting the nickel-plated steel strip subjected to the diffusion annealing treatment to obtain a finished product.
Example three:
the invention selects hot rolling strip blank coil stock with the thickness as follows: 1.8-3.2mm, and the length is determined according to the requirement of a client.
The thickness of the cold-rolled steel strip after cold rolling is as follows: 0.1-0.50 mm, width: 100-550 mm.
The invention adopts the following process steps:
1. the method comprises the following steps of firstly carrying out acid pickling treatment on a hot rolled strip blank roll raw material, and heating acid liquor by using steam at the temperature: pickling speed is about 80 ℃, and the pickling speed is generally 20 m/min;
2. carrying out a rolling process on a four-roller rolling mill after acid pickling treatment, wherein the rolling process is to roll the hot rolled strip from 1.8-3.2mm thick to 0.15-0.50 mm thick, the total reduction rate is more than 90%, emulsion is adopted in the rolling process, and the volume concentration of the emulsion is selected as follows: 4-6%, and the pH value is: 7, the four-high mill speed is: 400 m/min;
3. the cold-rolled steel strip is subjected to edge cutting, degreasing and coil loosening treatment, wherein the degreasing is performed on a continuous line, and the degreasing speedis as follows: 80 m/min;
4. in order to ensure that the surface of a steel strip is not oxidized and keeps bright, nitrogen-hydrogen protective gas 25% N2+ 75% H2 is used, nitrogen and vacuumizing are used for washing the steel strip after the steel strip is charged, air in the steel strip is completely exhausted, then the temperature is raised at the speed of 55 ℃ per hour, the temperature is kept for 5 hours when the temperature is raised to 500 ℃, then the temperature is continuously raised to 620 ℃ and kept for 13 hours, then the power is cut off and the temperature is reduced to 580 ℃, a heating cover is uncovered, the steel strip is air-cooled to 380 ℃, and the steel strip is taken out from the furnace after being;
5. leveling the cold-rolled steel strip after heat treatment, wherein a roughening roller is adopted as a leveling roller, and the roughness is as follows: 0.7 μm, convexity: 0.07mm, leveling and then stretching, bending and straightening, wherein the tension in the stretching and straightening process is as follows: 320Mpa, speed: 100 m/min;
6. and (3) performing nickel electroplating after stretching and straightening:
(1) chemical oil removal: chemically degreasing the steel strip after stretching and straightening, and spraying and washing; the oil removing powder is taken as follows: 70 g/L of the mixture is prepared into an oil removing powder solution, and the oil removing powder solution is heated at the temperature: 85 ℃; the oil removal speed is as follows: 100 m/min;
(2) and electrolytic degreasing: carrying out electrolytic degreasing on the steel strip subjected to spray rinsing, and scrubbing; preparing 4 weight percent of sodium hydroxide and the balance of water into an electrolytic solution; and heating the electrolytic solution at the temperature: 85 ℃; current: 3000A; the electrolytic degreasingspeed is as follows: 100 m/min;
(3) acid washing: pickling the steel strip which is electrolytically degreased and scrubbed, and preparing 9 weight percent of hydrochloric acid and the balance of water into pickling solution; the pickling speed is as follows: 100 m/min;
(4) the steel strip after acid cleaning and scrubbing is respectively plated with nickel on one side or two sides, and the formula of the nickel plating electroplating solution comprises the following components: in grams/liter: nickel sulfamate is: 450. the sodium chloride is: 25. the boric acid is: 28; the temperature of the nickel plating solution is as follows: at 55 ℃, the current density was: 20 amperes/dm 2; the thickness of the nickel plating layer is as follows: 4.5 mu;
(5) after nickel plating, spraying and washing are carried out;
(6) and drying the steel strip after spraying and washing, wherein the drying temperature is as follows: 140 ℃; and (3) performing electrostatic oiling on the dried nickel-plated steel strip, wherein the oiling amount is as follows: 6mg/m 2;
7. the steel strip is subjected to diffusion annealing treatment after being plated with a nickel layer, the diffusion annealing treatment uses nitrogen-hydrogen protective gas 25% N2+ 75% H2, then the temperature is raised at the speed of 55 ℃ per hour, when the temperature is raised to 590 ℃, the power is cut off after the temperature is kept for 12 hours, the steel strip is cooled to 580 ℃ and hung on a heating cover, and the steel strip is cooled to 380 ℃ along with the furnace, cooled to 80 ℃ by water and taken out of the furnace;
8. and flattening and cutting the nickel-plated steel strip subjected to the diffusion annealing treatment to obtain a finished product.
The raw materials adopted in the embodiment of the invention are purchased in the market, and the used equipment such as a single-stand four-roll mill and the like are conventional equipment.
Claims (4)
1. A high-precision nickel composite steel band is coiled into a coil material with a coil structure from inside to outside by a cold-rolled steel band, and is characterized in that a nickel layer is electroplated on one side or both sides of the cold-rolled steel band.
2. The high precision nickel composite steel strip according to claim 1, wherein the steel strip has a thickness of: 0.10-0.50 mm, width: 100-550 mm.
3. The high-precision nickel composite steel strip according to claim 1, wherein the thickness of the nickel plating layer is as follows: 0.5-8 u.
4. A process for producing a high-precision nickel composite steel strip according to claim 1, characterized by comprising the following process steps:
(1) the thickness of the hot rolled steel strip coil raw material is 1.8-3.2mm, acid pickling treatment is carried out, acid liquor is heated, and the heating temperature is as follows: the pickling speed is about 70-80 degrees centigrade: 10-20 m/min;
(2) rolling the steel strip subjected to acid pickling by adopting a four-high mill, and carrying out 9-11 times of cold rolling on the emulsion for lubricating and cooling agent to obtain the steel strip with the thickness: 0.15-0.50 mm; the four high mill speed is: 200-400 m/min;
(3) and performing trimming, degreasing and coil loosening treatment on the cold-rolled steel strip, wherein the degreasing speed is as follows: 70-80 m/min;
(4) carrying out heat treatment on the degreased cold-rolled steel strip, adopting 25% N2+ 75% H2 of nitrogen-hydrogen protective gas to prevent the surface of the steel strip from being oxidized, washing the steel strip by using nitrogen and vacuumizing, completely exhausting air in the steel strip, then raising the temperature at 45-55 ℃ per hour to 400-500 ℃, preserving the heat for 3-5 hours, then continuing raising the temperature to 580-690 ℃, preserving the heat for 11-16 hours, then powering off and cooling to 520-580 ℃, uncovering a heating cover, air cooling to 320-380 ℃, and water cooling to 70-80 ℃ to take the steel strip out of the furnace;
(5) and flattening the cold-rolled steel strip after heat treatment, wherein the roughness is as follows: 0.6-0.8 μm, convexity: 0.05-0.07 mm, leveling and then stretching, bending and straightening, wherein the tension in the stretching and straightening process is as follows: 280-320 Mpa at a speed of: 80-100 m/min;
(6) and performing nickel electroplating after stretching and straightening:
(a) chemical oil removal: chemically degreasing the steel strip after stretching and straightening, and spraying and washing; the oil removing powder is taken as follows: preparing an oil removing powder solution by 60-70 g/L, and heating the oil removing powder solution at the temperature of: 70-85 ℃; the oil removal speed is as follows: 80-100 m/min;
(b) and electrolytic degreasing: carrying out electrolytic degreasing on the steel strip subjected to spray rinsing, and scrubbing; taking sodium hydroxide as follows: 2-4 wt% of water, and the balance being water, to prepare an electrolytic degreasing solution; and heating the electrolytic solution at the temperature: 70-85 ℃; current: 3000A; the electrolytic degreasing speed is as follows: 80-100 m/min;
(c) acid washing: carrying out acid washing and scrubbing on the steel strip subjected to electrolytic degreasing and scrubbing, wherein hydrochloric acid is taken as: 3-9 wt% of water, and the balance being water, to prepare an acid washing solution; the pickling speed is as follows: 80-100 m/min;
(d) the steel strip after acid cleaning and scrubbing is electroplated with nickel, and the formula of the nickel plating electroplating solution comprises the following components: in grams/liter: nickel sulfamate is: 300-450, sodium chloride is: 20-25, boric acid is: 25-32, pH: 4 to 5.5; the temperature of the electroplating solution is as follows: at 40-55 ℃, the current density is as follows: 5-25 amperes/dm 2; the thickness of the nickel plating layer is as follows: 0.5-8 mu;
(e) after nickel electroplating, spraying and washing are carried out;
(f) and drying the steel strip after spraying and washing, wherein the drying temperature is as follows: 120-140 ℃; performing electrostatic oiling on the dried nickel-plated steel strip, wherein the oiling amount is 2-6 mg/m 2;
(7) the steel strip is subjected to nickel plating and then enters diffusion annealing treatment, nitrogen-hydrogen protective gas 25% N2+ 75% H2 is used in the diffusion annealing treatment, then the temperature is raised at the speed of 45-55 ℃ per hour, the temperature is raised to 590-610 ℃, the temperature is kept for 10-12 hours, then the power is cut off, the steel strip is cooled to 520-580 ℃, a heating cover is hung, the steel strip is cooled to 320-380 ℃ along with the furnace, and the steel strip is cooled to 70-80 ℃ by water and taken out of the furnace;
(8) and flattening and cutting the nickel-plated steel strip subjected to the diffusion annealing treatment to obtain a finished product.
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| CN113578962A (en) * | 2021-07-23 | 2021-11-02 | 安徽楚江特钢有限公司 | Production method of ultrathin cold-rolled steel strip for clothing |
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2006
- 2006-06-13 CN CNB2006100859877A patent/CN100560354C/en not_active Expired - Fee Related
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| CN114737196A (en) * | 2021-01-07 | 2022-07-12 | 江苏创泰特钢制品有限公司 | Production method of softened steel strip |
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| CN113578962A (en) * | 2021-07-23 | 2021-11-02 | 安徽楚江特钢有限公司 | Production method of ultrathin cold-rolled steel strip for clothing |
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| CN114411213A (en) * | 2022-02-17 | 2022-04-29 | 江苏东方九天新能源材料有限公司 | Preparation method of nickel-plated steel strip for lithium battery |
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