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Complete-displacement cyanide-free alkaline copper

A technology of cyanide-alkali copper and moving agent, which is applied in the field of electroplating chemistry, and can solve problems such as corrosion flow marks at the nozzle, affecting electroplating, and corrosion of iron substrates

Inactive Publication Date: 2013-02-27
NANJING DADI REFRIGERATION FOOD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the shape of the workpiece is relatively complex, such as the inner wall of the iron pipe, it is difficult to deposit copper coating in ordinary alkali copper electroplating, so in the subsequent acidic plating solution, the iron substrate will be corroded, and impurities such as iron will be brought to the subsequent plating solution. Affect the subsequent electroplating; at the same time, the corrosion of the inner wall of the iron pipe will also cause corrosion flow marks at the nozzle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] In 120g / L HEDP (hydroxyethylidene diphosphonic acid) solution, add 20g / L EDTA and stir well. Then add 20g / L copper pyrophosphate and 5g / L copper sulfate, heat to 50°C and stir evenly. Continue to add 10g / L tetrahydroxypropyl ethylenediamine, 5ppm 2,2-bipyridine, 80ppm potassium ferricyanide and 10ppm polyethylene glycol, and adjust the pH to 10-11 with 20% sodium hydroxide .

[0010] Electroplate the test piece in the Hull cell, the operating conditions are: 1A current, and the electroplating time is 2 minutes. The copper plating on the obtained test piece completely covered the test piece, and was semi-bright and evenly red.

[0011] In addition, a pilot test was carried out in a 50L large tank. Under the current density of 0.5-1A / dm2, the iron pipe was used as the workpiece to be electroplated for 5 minutes under the charged tank. The outer wall of the iron pipe was coated with a semi-bright copper coating, and the thickness of the coating was 0.2-1.2 μm; and the i...

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PUM

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Abstract

The present invention discloses a complete-displacement cyanide-free alkaline copper, which comprises the following components: 1-10 g / L of copper ions, 50-150 g / L of a HEDP complexing agent, 10-25 g / L of EDTA, 10-15 g / L of tetrahydroxypropyl ethylenediamine, 3-8 ppm of 2,2-dipyridyl, 50-100 ppm of potassium ferricyanide, and 1-20 ppm of a displacement agent. The complete-displacement cyanide-free alkaline copper has advantages of no cyanide and complete-displacement copper covering capacity, and is particularly suitable for complex shape workpieces.

Description

technical field [0001] The invention belongs to the technical field of electroplating chemistry, in particular to a cyanide-free copper plating solution with low pollution and low toxicity. Background technique [0002] Electroplating copper is an important type of plating in electroplating, mainly divided into acid copper plating and alkaline copper plating. At present, the complexing agent of alkaline copper plating all adopts cyanide, so it has extremely high toxicity and causes great environmental pollution. Recently, some companies have also researched electroplating copper in the environment of pentacyanide, but it can only be used for iron substrates. When the shape of the workpiece is relatively complex, such as the inner wall of the iron pipe, it is difficult to deposit copper coating in ordinary alkali copper electroplating, so in the subsequent acidic plating solution, the iron substrate will be corroded, and impurities such as iron will be brought to the subsequ...

Claims

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Application Information

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IPC IPC(8): C25D3/38
Inventor 陈大弟
Owner NANJING DADI REFRIGERATION FOOD