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Propanetriol non-cyanide bright copper plating liquid

A technology of glycerin and copper plating solution, which is applied in the fields of glycerin-free cyanide-free bright copper plating and cyanide-free copper plating. Uniform and flat coating, wide range of cathode current density and low production cost

Inactive Publication Date: 2008-01-16
MATERIAL SCI RES INST SHANDONG INST OFCIVIL ENG
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0018] In addition to the above-mentioned processes, people have also studied the copper plating solution with potassium sodium tartrate, nitrilotriacetic acid, citric acid, etc. as the main complexing agent. Good coating, but the preparation of the plating solution is cumbersome, the maintenance of the plating solution is difficult, the requirements for the operator are high, the cost of the plating solution is high, and it is difficult to realize industrial production

Method used

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  • Propanetriol non-cyanide bright copper plating liquid

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Embodiment Construction

[0034] Weigh glycerol and sodium hydroxide according to the above formula, make a solution according to two-thirds of the total volume of the plating solution, add the corresponding amount of copper sulfate to the solution after dissolving, sodium sulfate and ammonium citrate respectively Dissolved into the plating tank, diluted to the total volume.

[0035] The pH value of the above-mentioned plating solution is 7-8, at room temperature at 0.1-3.0A / dm 2 In the range of cathode current density, a uniform, bright, fine and good coating can be obtained. (the binding force is measured by thermal shock method) when the cathode current density D K 2 , a very uneven coating was obtained. When the cathode current density D K >3.0A / dm 2 , the coating is scorched. At 0.1~3.0A / dm 2 Within the range of cathodic current density and the same plating time, the thickness of the coating gradually increases with the increase of current density. As the current density increases, t...

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Abstract

A brightening non-cyanogen copper-plating liquid is proportionally prepared from copper sulfate propanetriol, sodium hydroxide, decahydrated sodium sulfate and ammonium citrate through preparing the solution of propanetriol and sodium hydroxide, dissolving copper sulfate in it, dissolving others in it, and deluting.

Description

technical field [0001] The invention relates to the field of cyanide-free copper plating, in particular to the field of glycerin-free cyanide-free bright copper plating. Background technique [0002] In order to obtain a coating with good bonding force in electroplating production, pre-plating is often selected according to the difference of the plating type and the difference of the parts to be plated. In the previous pre-plating process, cyanide copper plating was often used, but because CN is highly toxic, it will cause great damage to the health of electroplating workers; at the same time, the sewage and waste gas of CN will also seriously pollute the environment. Order No. 32 issued by the State Economic and Trade Commission in 2002 clearly stipulates that cyanide-containing electroplating will be limited to phase-out in 2003. It is imminent to speed up the research of cyanide-free electroplating process, realize clean production and strengthen environmental protection...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/38
Inventor 王玥冯立明李华杨维刚王静
Owner MATERIAL SCI RES INST SHANDONG INST OFCIVIL ENG