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CN-121976270-A - Production process of tinned copper clad steel wire

CN121976270ACN 121976270 ACN121976270 ACN 121976270ACN-121976270-A

Abstract

The invention discloses a production process of a tinned copper clad steel wire, which comprises the steps of heating and softening a low-carbon steel wire, carrying out primary water tank wire drawing, electrolytic pickling and wire drawing on the steel wire, carrying out nickel alloy plating on the steel wire, carrying out copper plating on the steel wire by a secondary water tank, carrying out wire drawing on the steel wire until the steel wire reaches a target section and a target wire diameter, carrying out ultrasonic water washing and copper clad steel wire drawing, carrying out nickel plating on the steel wire, and carrying out tin plating on the steel wire, wherein the nickel alloy plating is made of nickel-iron-manganese alloy, the mass volume concentration ratio of nickel salt, iron salt and manganese salt in nickel alloy plating solution is 100 (2.2-7.5): (0.4-3.1), and the thickness of a nickel-iron-manganese alloy layer is 0.5-1.5 mu m. The nickel-iron-manganese alloy with compact crystal grains is adopted to replace a nickel layer between a steel wire substrate and a copper layer in the prior art, an ultrasonic water washing step is arranged, the hardness of a plating layer and the binding force with a matrix are improved, the defects of plating layer cracks, stripping and the like in a wiredrawing copper-clad steel wire are reduced, and the mechanical property of the tinned copper-clad steel wire is improved.

Inventors

  • ZHU XIANGYANG
  • HU JIAMAO

Assignees

  • 江阴六环合金线有限公司

Dates

Publication Date
20260505
Application Date
20260116

Claims (11)

  1. 1. The production process of the tinned copper clad steel wire is characterized by comprising the following steps of: Heating and softening the low-carbon steel wire, primary water tank wire drawing, electrolytic pickling the wire drawing steel wire, nickel alloy plating of the steel wire, copper plating of the steel wire, secondary water tank wire drawing to a target section and a target wire diameter, ultrasonic water washing copper-clad steel wire drawing, nickel plating of the steel wire and tin plating of the steel wire; The nickel alloy plating layer is made of nickel-iron-manganese alloy, and the mass volume concentration ratio of nickel salt, iron salt and manganese salt in the nickel alloy plating solution is 100 (2.2-7.5): (0.4-3.1); the thickness of the nickel-iron-manganese alloy layer is 0.5-1.5 mu m.
  2. 2. The production process of the tinned copper clad steel wire according to claim 1, wherein the pickling solution for electrolytic pickling is a 22% -29% sulfuric acid solution, the current density is 1.6-3A/dm 2 , and the pickling time is 30-60 s.
  3. 3. The production process of the tinned copper clad steel wire according to claim 2, wherein the alloy plating solution of the steel wire nickel plating alloy comprises 210-270 g/L of nickel sulfamate, 15-50 g/L of nickel sulfate, 8-21 g/L of ferrous sulfate, 1.5-7.3 g/L of manganese sulfamate, 15-35 g/L of boric acid, 25-40 g/L of complexing agent, 3-8 g/L of reducing agent, 0.05-0.4 g/L of wetting agent and the balance of deionized water, and the alloy plating solution is added with metallic nickel in the steel wire nickel plating alloy step.
  4. 4. The process for producing a tin-plated copper clad steel wire according to claim 3, wherein the plating temperature of the alloy plating solution is 40-55 ℃ and the current density is 2.1-3 a/dm 2 .
  5. 5. The process for producing a tinned copper clad steel wire according to claim 2, wherein the drawing deformation of primary water tank drawing is 40% -55% in terms of diameter before and after drawing; the wire diameter of the steel wire obtained by primary water tank wire drawing is 1.2-1.8 mm, the thickness of the copper layer is 5-50 mu m, and the target wire diameter specification is not less than 0.3mm.
  6. 6. The process for producing a tinned copper clad steel wire according to claim 3, wherein the complexing agent is at least one selected from the group consisting of ethylenediamine tetraacetic acid, citric acid, nitrilotriacetic acid and hydroxyethyl ethylenediamine triacetic acid, the reducing agent is glucose and/or sulfite, and the wetting agent is at least one selected from the group consisting of long-chain alkyl sodium sulfate.
  7. 7. The process for producing the tinned copper clad steel wire according to claim 1 or 5, wherein the heating and softening step comprises the steps of charging the steel wire into a furnace, gradually raising the furnace temperature from normal temperature to 570-610 ℃ in nitrogen atmosphere, preserving heat for 10-18 h, cooling to room temperature and discharging.
  8. 8. The process for producing a tinned copper clad steel wire according to claim 3, wherein the complexing agent is a combination of ethylenediamine tetraacetic acid and citric acid, and the concentration ratio of ethylenediamine tetraacetic acid to citric acid is 1 (0.3-0.7).
  9. 9. The process for producing a tin-plated copper clad steel wire according to claim 3, 6 or 8, wherein the alloy plating solution further comprises 0.05-0.5 g/L of polyoxyethylene Shan Naiji ether.
  10. 10. The process for producing a tinned copper clad steel wire according to claim 1 or 5, wherein the water temperature of the ultrasonic water washing is 75-95 ℃, and the ultrasonic frequency is 16-25 khz.
  11. 11. The process for producing a tin-plated copper clad steel wire according to claim 1, wherein the copper plating step of the steel wire is copper sulfate plating, the current density is 4-8 a/dm 2 , and the plating solution temperature is 30-50 ℃.

Description

Production process of tinned copper clad steel wire Technical Field The invention relates to the technical field of tinned copper clad steel wire production, in particular to a production process of a tinned copper clad steel wire. Background The tinned copper clad steel wire takes the steel wire as a core, the copper layer provides conductivity, and the surface tin layer provides antioxidation and welding performance, and is widely applied to the fields of circuit board connection, component lead wire, high-frequency signal transmission and the like. The tin-plated copper-clad steel wire has a hard state and a soft state. The hard state product has a higher tensile strength, rigidity and lower elongation than the soft state product. The production process for producing the hard tinned copper clad steel wire by electroplating in the prior art comprises the following steps of annealing and softening an iron wire, drawing wire to a smaller wire diameter at one time, plating copper, drawing wire to a target wire diameter at the second time, plating nickel and plating tin in sequence. In order to enhance the binding force between the copper layer and the steel, the improved technical scheme is as described in CN107564624A, and a nickel layer is firstly electroplated on the surface of the steel wire before the copper plating step. The sections of the raw steel wires for primary wire drawing and secondary wire drawing are round, and the target section for secondary wire drawing comprises round, square and flat. When the ratio of the wire diameter size after the secondary wire drawing to the wire diameter size before the wire drawing is more than or equal to 4, the wire drawing production of the copper-clad steel wire has the following problems that the plating layer at the edge angle of the square copper-clad steel wire obtained by the first and the secondary wire drawing has peeling or crack defects (shown in figure 1), and the curling and winding performance test of the round copper-clad steel wire obtained by the second and the secondary wire drawing has multiple plating layer cracks and peels. The defect of insufficient adhesion of the plating layer can further influence the normal use of the tinned copper clad steel wire, so that the problems of poor soldering tin and the like are caused. In addition, the mechanical properties of the tinned copper clad steel wire are also to be improved. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides a production process of a tinned copper clad steel wire, which improves the binding force between a plating layer and a low-carbon steel matrix and reduces the probability of defects such as flaking, cracking and the like of the plating layer after secondary wire drawing. In order to achieve the technical effects, the technical scheme of the invention is that the production process of the tinned copper clad steel wire comprises the following steps: Heating and softening the low-carbon steel wire, primary water tank wire drawing, electrolytic pickling the wire drawing steel wire, nickel alloy plating of the steel wire, copper plating of the steel wire, secondary water tank wire drawing to a target section and a target wire diameter, ultrasonic water washing copper-clad steel wire drawing, nickel plating of the steel wire and tin plating of the steel wire; The nickel alloy plating layer is made of nickel-iron-manganese alloy, wherein the alloy plating solution of the nickel alloy comprises nickel salt, ferric salt and manganese salt, and the mass volume concentration ratio of the nickel salt, the ferric salt and the manganese salt is 100 (2.2-7.5) (0.4-3.1); the thickness of the nickel-iron-manganese alloy layer is 0.5-1.5 mu m. According to the preferable technical scheme, the pickling solution for electrolytic pickling is a sulfuric acid solution with concentration of 22% -29%, the current density is 1.6-3A/dm 2, and the pickling time is 30-60 s. The concentration of the pickling solution for electrolytic pickling is selected to be 22%, 24%, 26%, 28%, 29% or a range with two points as the minimum value and the maximum value, the current density is selected to be 1.6, 1.9, 2.1, 2.4, 2.7, 3A/dm 2 or a range with two points as the minimum value and the maximum value, more preferably 1.8-2.5A/dm 2, and the pickling time is selected to be 30s, 40s, 50s, 60s or a range with two points as the minimum value and the maximum value. The alloy plating solution for the nickel plating alloy of the steel wire comprises 210-270 g/L of nickel sulfamate, 15-50 g/L of nickel sulfate, 8-21 g/L of ferrous sulfate, 1.5-7.3 g/L of manganese sulfamate, 15-35 g/L of boric acid, 25-40 g/L of complexing agent, 3-8 g/L of reducing agent, 0.05-0.4 g/L of wetting agent and the balance of deionized water, wherein a metal nickel material is added into the alloy plating solution in the nickel plating alloy step of the steel wire. Specifically, the concentration