Maintenance method for alkaline non-cyanide plating copper

A cyanide-free copper plating, alkaline technology, applied in the field of electrochemical surface science and engineering, to achieve the effect of good dispersion and deep plating ability, good bonding force, and convenient process maintenance

Inactive Publication Date: 2008-10-01
广州市二轻研究所股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims to solve the anode problem and the maintenance method of the plating solution. If the insoluble anode is used, copper salt needs to be supplemented to make up for the consumption of copper ions in the electroplating process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A maintenance method for alkaline cyanide-free copper plating, comprising the steps of: in a citrate system alkaline cyanide-free copper plating bath, the content of copper ions is 8g / L, and adjusting the concentration of the bath with citric acid or sodium hydroxide The pH value is 8.5, stainless steel is used as the insoluble anode, and the iron hook is used as the cathode to be plated for the workpiece to be electroplated; during the electroplating process, the cathode is moved 5 times per minute at 1A / dm 2 Electroplating at the current density for 2 minutes, then acid copper plating, bright nickel plating, trivalent chromium plating or hexavalent chromium plating. , Supplement copper ions to the initial concentration, adjust the pH value of the plating solution to 8.5 with citric acid or sodium hydroxide, and filter the plating solution with a filter, the electroplating can continue, and the quality of the plating layer has not declined.

Embodiment 2

[0028] In the alkaline cyanide-free copper plating solution of tartrate system, the copper ion content is 8g / L, the pH value of the plating solution is adjusted to 9 with tartaric acid, sulfuric acid or sodium hydroxide, stainless steel is used as the insoluble anode, and the iron hook is used as the cathode. Plating the workpiece for electroplating; during the electroplating process, the pressure is 0.3MPa air stirring, with 1A / dm 2 Electroplating at a current density of 10 minutes, followed by acidic copper plating, bright nickel plating, trivalent chromium plating or hexavalent chromium plating, the surface is bright, no sand, the iron hook is bent to break, the fracture does not burst, and the battery is electroplated for 10 ampere hours Finally, add copper tartrate to bring the copper ions to the initial concentration, and adjust the pH value of the plating solution to 9 with tartaric acid, sulfuric acid or sodium hydroxide, and filter the plating solution with a filter to...

Embodiment 3

[0030] In the alkaline cyanide-free copper plating solution of pyrophosphate system, the copper ion content is 25g / L, the pH value of the plating solution is adjusted to 8.2 with phosphoric acid, sulfuric acid or sodium hydroxide, and ammonia water, and stainless steel is used as the insoluble anode. The aluminum alloy after nickel is used as the cathode to be plated, and electroplating is carried out; during the electroplating process, the cathode is moved 15 times per minute, and 0.02g / L of selenium dioxide additive is added at a rate of 1A / dm 2 Electroplating at the current density for 5 minutes, then acidic copper plating, bright nickel plating, trivalent chromium plating or hexavalent chromium plating, the surface is bright, no sand, the iron hook bends to break, the fracture does not burst, electroplating 100 ampere hours Finally, add copper pyrophosphate to make the copper ion to the initial concentration, add 0.001g / L additive selenium dioxide, and adjust the pH value o...

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PUM

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Abstract

The invention discloses a maintaining method for an alkalescent non-cyanide cuprodine. The method uses indissoluble anode, cathode in the alkalescent non-cyanide cuprodine liquor as the galvanized workpiece, adds cupric salt, complexing agents and additives and adjusts the pH value of the galvanizing liquor to control the current dense range between 0.1-7A / dm2; the galvanizing time is between 1min to 72h; then the galvanizing liquor is filtered; the galvanizing liquor is processed air bend or moves the workpiece while galvanizing. The invention uses the indissoluble anode comprising stainless steel, DSA coating, titanium, platinum, graphite which is simple to use, innoxious, harmless; the invention has a low production cost and even, smooth and shining fine galvanizing layer by using the indissoluble anode. The technique maintaining method of the invention has a simple operation, great stability of galvanizing liquor and convenient maintenance for the galvanizing liquor.

Description

technical field [0001] The invention belongs to the field of electrochemical surface science and engineering, in particular to a maintenance method for alkaline cyanide-free copper plating. Background technique [0002] Cyanide copper plating has long been used as a base copper plating process for steel, zinc alloys, etc., but cyanide is highly toxic and poses a serious threat to operators and the environment, which makes cyanide copper plating contrary to clean production. Therefore, the cyanide-free electroplating process is The direction of future development. Cyanide-free alkaline copper plating is the product required by the development of clean production in the country. To a large extent, it eliminates the hazards of cyanide copper plating to operators and the environment. Many scientific researchers have paid a lot of attention to the exploration and promotion of cyanide-free plating technology Great progress has been made with little effort, but there are still gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/38C25D21/00C25D21/12
Inventor 赵国鹏邓正平徐金来胡耀红刘建平曾人正张晓明
Owner 广州市二轻研究所股份有限公司
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