CN103952735B - A kind of continuous copper-plating of steel strip technique - Google Patents

Abstract

A kind of continuous copper-plating of steel strip technique adopts cyanide copper plating process to electroplate.Mainly include pretreatment process and electro-coppering process.Pre-treatment mainly includes ultrasonic oil removal, electrolytic degreasing, washing, activation, washing；Electroplating process mainly includes copper facing, recovery, washing.Technology groove in continuous copper-plating of steel strip adopts the isosceles trapezoid groove with transparent openable observation window of closed, and cell body is designed as the cell body that top is isosceles trapezoid；Three transparent openable observation windows are respectively designed at the position, two slopes of groove；Article two, be respectively provided with between steel band and 3 anodes 4 block lengths equal there is nonmetal baffle plate corrosion-resistant, resistant to elevated temperatures, substantial amounts of electric lines of force, coating uniform ground will not be assembled in the edge of steel band.

Description

A continuous copper plating process for steel strip

technical field

The invention relates to the technical field of alkaline copper plating, in particular to a continuous copper plating process for steel strips.

Background technique

With the development of my country's industry, especially the rapid development of automobile and other industries, the demand for copper and copper products is increasing day by day. However, my country is a copper-poor country. Copper mainly depends on imports. In addition, the price of copper in the world has risen rapidly, which has brought great cost pressure to my country's automobile and other industries. After demonstration and practice, it is feasible to replace copper products with copper-plated steel products in industries such as automobiles and home appliances, and even have better performance than copper in some aspects. Copper-plated steel strips are mainly used to produce help pipes, which are widely used in automobile oil pipes, floor heating pipes, air-conditioning pipes, etc. Substituting iron for copper is not only an economic issue, it can also greatly reduce carbon emissions. Therefore, copper plating on steel strip has good social and economic benefits. Cyanide copper plating can be used to obtain a dense, smooth, and well-bonded coating, so the continuous copper plating of steel strips adopts the cyanide copper plating process. In the production of steel strip, the electric force lines between the anode and the steel strip tend to gather at the edge of the steel strip, resulting in differences in the thickness of the steel strip coating, which affects the performance of the coating.

Contents of the invention

A continuous copper plating process for a steel strip mainly includes a pretreatment process and an electroplating copper process. Pretreatment mainly includes chemical degreasing, electrolytic degreasing, water washing, activation, and water washing; electroplating process mainly includes pre-copper plating, main copper plating, recycling, and water washing. The process tank in the continuous copper plating of steel strip adopts a closed isosceles trapezoidal tank with a transparent and openable observation window, and the tank body is designed as an isosceles trapezoidal tank body above; It is designed with three transparent observation windows that can be opened; between the two steel strips and the three anodes, there are four non-metallic baffles of equal length with corrosion resistance and high temperature resistance; in the production of steel strips, the high current area It is often at the edge of the steel strip, that is, the edge effect. The edge effect will cause a large difference in the thickness of the coating in the high-current area and the low-current area. After adding a non-metallic baffle with corrosion resistance and high temperature resistance, the gap between the steel strip and the anode The power lines between them can go around the baffle, and the edge of the steel belt will not gather a large number of power lines, and the coating is even and flat.

detailed description

A continuous copper plating process for a steel strip provided by the present invention mainly includes a pretreatment process and an electroplating copper process. The pretreatment mainly includes chemical degreasing, electrolytic degreasing, water washing, activation, and water washing; the electroplating process mainly includes copper plating, recycling, wash. Among them, the degreasing treatment adopts the combination of ultrasonic degreasing and cathode-anode joint degreasing.

1. Hot water washing Use hot water at 70-80°C for 20-30 seconds.

2. Degreasing treatment includes ultrasonic degreasing and electrolytic degreasing, and electrolytic degreasing is cathode-anode joint degreasing. First, chemical degreasing is carried out for 1-3 minutes, and then electrolytic degreasing is carried out. When electrolytic degreasing is performed, the cathodic degreasing is first performed for 1 min, and then the anode is degreased for 15 s.

Described ultrasonic degreasing, ultrasonic degreasing cleaning agent, concentration is 5%, temperature is 40～50 ℃, and ultrasonic frequency is 25kHz.

3. In the activation treatment, the etching agent in the activation solution is hydrochloric acid, the concentration is 20g/L, the solution temperature is 35±5°C, the cathode current density is 7-10A/dm ² , and the etching time is 20-30s.

4. The water washing after degreasing and the water washing after activation all use pure water with a concentration of 0.5μS or less for cleaning, and the temperature of the washing water is 30-40°C.

5. A continuous copper plating process for a steel strip, wherein the electroplating process is a continuous copper plating process. The copper plating solution is mainly composed of cuprous cyanide, sodium cyanide and sodium hydroxide. During electroplating, the cathode current density is 0.2-2A/dm2, and the temperature is 55-65°C. The thickness of the coating is determined by the current and the tape winding machine. speed control. Cleaning water in each process uses pure water with a concentration of 0.5 μS or less.

Example 1

The process tank in the continuous copper plating of the steel strip adopts a closed isosceles trapezoidal tank with a transparent automatic opening observation window, and the tank body is designed as an isosceles trapezoidal tank body above; It is designed with three transparent observation windows that can be opened; between the two steel strips and the three anodes, there are four non-metallic baffles of equal length with corrosion resistance and high temperature resistance; in the production of steel strips, the high current area It is often at the edge of the steel strip, that is, the edge effect. The edge effect will cause a large difference in the thickness of the coating in the high-current area and the low-current area. After adding a non-metallic baffle with corrosion resistance and high temperature resistance, the gap between the steel strip and the anode The power lines between them can go around the baffle, and the edge of the steel belt will not gather a large number of power lines, and the coating is even and flat.

Claims (1)

1. A continuous copper plating process for steel strips, which adopts the cyanide copper plating process for electroplating, mainly includes a pretreatment process and an electroplating copper process, and the pretreatment mainly includes ultrasonic degreasing, electrolytic degreasing, washing, activation, and washing; the electroplating process It mainly includes copper plating, recycling, and water washing. It is characterized in that: the process tank in the continuous copper plating of steel strips adopts a closed isosceles trapezoidal tank with a transparent and openable observation window, and the tank body is designed to be isosceles Trapezoidal trough body; three transparent and openable observation windows are designed on the two slopes of the trough; four equal-length non-corrosion and high temperature resistant metal baffle; (1) Ultrasonic degreasing in the pretreatment process, ultrasonic degreasing cleaning agent, the concentration is 5%, the temperature is 40~50°C, and the ultrasonic frequency is 25kHz; (2) During the pretreatment process, the electrolytic deoiling solution is active alkali, the temperature of the alkali solution is 60-80°C, and the current density is 8-10A/dm ² ; (3) In the pretreatment process, electrolytic degreasing adopts cathode-anode joint degreasing, in which the cathode degreasing time is long, and the anode degreasing time is short; (4) The etching agent in the activation solution in the pretreatment process is hydrochloric acid, the concentration is 20g/L, the solution temperature is 35±5°C, the cathode current density is 7-10A/dm ² , and the erosion time is 20-30s; (5) 6 plating tanks, 1 recovery tank and 1 cleaning tank arranged in sequence are used in copper electroplating; (6) In the continuous copper plating of the steel strip, the plating solution in the plating tank passes through the circulating filtration of the filter to accelerate the electrodeposition speed; (7) adopt the mode of atomization spray to reclaim the plating solution on the steel strip at the steel strip outlet of the electroplating bath in the continuous copper plating of the steel strip; (8) Copper plating adopts the method of multi-station continuous electroplating. The plating solution is mainly composed of cuprous cyanide, sodium cyanide and sodium hydroxide. During electroplating, the cathode current density is 0.2-2A/dm ² and the temperature is 55-65 ℃, the thickness of the copper plating layer is determined by the current or transmission speed; (9) Cleaning and washing in each process uses pure water with a conductivity of 0.5 μS or less.