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Environment-friendly copper and copper alloy plate strip surface hot-dip tinning method

A copper alloy plate, hot-dip plating technology, applied in the hot-dip plating process, metal material coating process, coating, etc., can solve the problems of low production efficiency, damage, uneven coating thickness distribution, etc., to improve production Efficiency, guaranteed uniformity, and quality-enhancing effects

Active Publication Date: 2018-01-16
凯美龙精密铜板带(河南)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Since the thickness of the coating is determined by controlling the magnitude of the current and the concentration of the electrolyte, the thickness of the coating on the surface of the copper strip is unevenly distributed. Generally, the thickness of the edge is greater than the thickness of the middle
[0005] (2) During the electroplating process, whiskers are easy to form, resulting in internal stress in the coating or weak adhesion between the tin layer and the base metal, which in turn causes short-circuit accidents in miniaturized electronic components using electro-tinned copper strips
[0006] (3) At present, the production efficiency is low in the process of electrified tinning of copper plates, and the general speed is 40~50m / min;
[0007] (4) The composition of the electroplating solution is complex and contains a large amount of heavy metals, which is not suitable for recycling
Although the thickness of the coating can be controlled through this process, after a certain amount of tin wiping steel roll is used, the surface of the steel roll is prone to accumulation of tin slag or damage, which will lead to uneven distribution of coating thickness or a large number of defects in the coating
In addition, the existing hot-dip tinning process cannot meet high-speed continuous production, resulting in small coil diameter, low coil weight and low production efficiency of hot-dip tinned copper strips

Method used

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  • Environment-friendly copper and copper alloy plate strip surface hot-dip tinning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] An environment-friendly production process for hot-dip tinning of metal strips, comprising the following steps:

[0067] (1) Uncoil, place the pre-plated 0.1mm thick and 370mm wide C70250 copper alloy strip on the uncoiler for unwinding.

[0068] (2) Introduce the C70250 copper alloy strip treated in step (1) into the front S roll, and keep the tension of the strip at 15Mpa.

[0069] (3) Degreasing, degreasing and cleaning the C70250 copper alloy coil after the treatment in step (2) with an alkaline degreasing solution composed of silicates and non-ionic surfactants, keeping the concentration of the degreasing solution at 1-2% , The temperature is 50-80 ℃. Remove the oil on the surface of the copper strip through step (3) to ensure that the tin layer is uniform and smooth during hot-dip tinning.

[0070] (4) Cold rinsing. The copper and copper alloy strips treated in step (3) are cold-rinsed with deionized water or pure water, and the pH value of the cleaning water is...

Embodiment 2

[0089] An environment-friendly production process for hot-dip tinning of metal strips, comprising the following steps:

[0090] (1) Uncoil, place the pre-plated 1.5mm thick and 200mm wide C42500 copper alloy strip on the uncoiler for unwinding.

[0091] (2) The C42500 copper alloy strip treated in step (1) is introduced into the front S roller, and the tension of the strip is kept at 30Mpa.

[0092](3) Degreasing, degreasing and cleaning the C42500 copper alloy coil after the treatment in step (2) with an alkaline degreasing solution composed of silicates and non-ionic surfactants, keeping the concentration of the degreasing solution at 1-2% , The temperature is 50-80 ℃. Remove the oil on the surface of the copper strip through step (3) to ensure that the tin layer is uniform and smooth during hot-dip tinning.

[0093] (4) Cold rinsing. The copper and copper alloy strips treated in step (3) are cold-rinsed with deionized water or pure water, and the pH value of the cleaning ...

Embodiment 3

[0112] An environment-friendly production process for hot-dip tinning of metal strips, comprising the following steps:

[0113] (1) Uncoil, place the pre-plated 1.2mm thick and 370mm wide C10100 (TU00) copper strip coil on the uncoiler for unwinding.

[0114] (2) Introduce the C10100 (TU00) copper strip coil treated in step (1) into the front S roller, and keep the coil tension at 20Mpa.

[0115] (3) Degreasing, degreasing and cleaning the C10100 (TU00) copper coils treated in step (2) with an alkaline degreasing solution composed of silicates and non-ionic surfactants, keeping the concentration of the degreasing solution at 1- 2%, the temperature is 50-80°C. Remove the oil on the surface of the copper strip through step (3) to ensure that the tin layer is uniform and smooth during hot-dip tinning.

[0116] (4) Cold rinsing. The copper and copper alloy strips treated in step (3) are cold-rinsed with deionized water or pure water, and the pH value of the cleaning water is kep...

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Abstract

The invention discloses an environment-friendly copper and copper alloy plate strip surface hot-dip tinning method. The environment-friendly copper and copper alloy plate strip surface hot-dip tinningmethod comprises the following steps: performing degreasing treatment on a copper and copper alloy plate strip by alkaline degreasing liquid; performing acid-washing treatment on the plate strip by using H2SO4; performing activating treatment on the plate strip by a solution consisting of ammonium bromide, hydrogen bromide and other chemical agents; preheating the copper and copper alloy plate strip in a drying / preheating area, wherein the preheating temperature is 50 to 130 DEG C; introducing the plate strip into a tin liquid groove of pure tin or tin silver alloy, and tinning, wherein the tinning temperature is 230 to 290 DEG C; introducing the plate strip into an air knife position, and automatically controlling the thickness of the plating layer according to the thickness of the pre-plated plate strip and the preset thickness of the plating layer; introducing the plate strip into an air cooling area and reducing the temperature to 120 to 150 DEG C by an air-cooling fan; and introducing the plate strip into a water tank containing deionized water or pure water and reducing the temperature to 20 to 60 DEG C. According to the plate strip surface hot-dip tinning method provided bythe invention, the steps are reasonable, uniformity of the tin layer on the surface of the copper plate strip is effectively guaranteed and the tinning quality is improved.

Description

technical field [0001] The invention relates to the field of production and processing of metal strips, in particular to an environment-friendly method for hot dip tinning the surface of copper and copper alloy strips. Background technique [0002] Tin-plated copper strip has many excellent properties, prevents copper strip from being oxidized and corroded by acidic and alkaline substances, reduces contact resistance in motor components and electronic components, and is used in the new generation of information technology industry, advanced rail transit, energy saving and It has been widely used and developed in new energy vehicles and electric power equipment industries, and is mainly used in the manufacture of large-scale integrated circuits, high-density lead frames, high-end electronic components, and precision connector terminals. [0003] At present, tinning on the surface of copper strips is generally divided into electro-tinning and hot-dip tinning. Compared with ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/08C23C2/20
Inventor 刘爱奎刘栋王世中鲁长建郭凯柯希富赵红生孟凡俭
Owner 凯美龙精密铜板带(河南)有限公司
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