Cyanide-free copper-zinc alloy electroplating solution and preparation method thereof

An alloy electroplating solution and electroplating solution technology are applied in the field of electrochemical copper-zinc plating, which can solve the problems affecting the health of operators, polluting the environment, and difficult wastewater treatment, and achieve low production costs, low impurity content, and low wastewater treatment costs. Effect

Active Publication Date: 2014-05-21
浙江洽福科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the copper-zinc cyanide electroplating solution of the prior art contains toxic substance cyanide, affects the health of the operator, pollutes the environment, and the waste water is difficult to handle, and provides a cyanide-free copper-zinc alloy electroplating solution, The electroplating solution does not contain cyanide, is environmentally friendly, and is safe and convenient to manufacture, store and use

Method used

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  • Cyanide-free copper-zinc alloy electroplating solution and preparation method thereof
  • Cyanide-free copper-zinc alloy electroplating solution and preparation method thereof
  • Cyanide-free copper-zinc alloy electroplating solution and preparation method thereof

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Embodiment 1

[0044] A preparation method of cyanide-free copper-zinc alloy electroplating solution, said preparation method comprising the following steps:

[0045] (1) Preparation of complexing agent: the general formula of the complexing agent is M x H y P n O 3n +1R z , Where x=3, y=0, n=2, z=1, M is K + , R is an acetyl group, the specific structural formula is as follows:

[0046]

[0047] Potassium hydroxide, phosphoric acid and acetic acid were mixed and reacted at a molar ratio of 3:2:1, and the reaction solution was spray-dried to obtain partially polymerized intermediate powder. The intermediate powder was placed in a rake dryer for polymerization at 250°C for 10 hours , The finished product of complexing agent is obtained after the polymerization reaction is finished;

[0048] (2) Preparation of copper salt: the complexing agent prepared in step (1) is mixed with copper sulfate at a molar ratio of 2:3 in an aqueous phase system and reacted at 25°C for 1 hour. After the reaction, it is ...

Embodiment 2

[0054] A preparation method of cyanide-free copper-zinc alloy electroplating solution, said preparation method comprising the following steps:

[0055] (1) Preparation of complexing agent: the general formula of the complexing agent is M x H y P n O 3n +1R z , Where x=3, y=0, n=3, z=2, M is K + And Na + , R is an acetyl group, the specific structural formula is as follows:

[0056]

[0057] Sodium hydroxide, phosphoric acid and acetic acid were mixed and reacted at a molar ratio of 3:3:2, and the reaction solution was flash dried to obtain a partially polymerized intermediate powder. The intermediate powder was placed in a rake dryer at 200°C for polymerization. 10h, after the polymerization reaction, the finished product of complexing agent is obtained;

[0058] (2) Preparation of copper salt: the complexing agent prepared in step (1) and copper sulfate at a molar ratio of 2:3 are mixed uniformly in an aqueous system, reacted at 100°C for 0.5h, and centrifuged and dried after the re...

Embodiment 3

[0064] A preparation method of cyanide-free copper-zinc alloy electroplating solution, said preparation method comprising the following steps:

[0065] (1) Preparation of complexing agent: the general formula of the complexing agent is M x H y P n O 3n +1R z , Where x=1, y=100, n=100, z=1, M is Na + , R is an acetyl group, the specific structural formula is as follows:

[0066]

[0067] Sodium bicarbonate, phosphoric acid and acetic acid were mixed and reacted at a molar ratio of 1:100:1, and the reaction solution was flash dried to obtain partially polymerized intermediate powder. The intermediate powder was placed in a rake dryer at 300°C for polymerization. 2.5h, the finished product of complexing agent is obtained after the polymerization reaction is finished;

[0068] (2) Preparation of copper salt: Mix the complexing agent prepared in step (1) with copper sulfate at a molar ratio of 2:1, and react at 25°C for 1.0 h. After the reaction, the copper salt is obtained by centrifugal...

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Abstract

The invention relates to a cyanide-free copper-zinc alloy electroplating solution and a preparation method thereof. The electroplating solution consists of the following components in percentage by weight: 1-60 percent of complexing agent, 0.3-10 percent of copper salt, 0.2-10 percent of zinc salt and the balance of water, wherein the general formula of the complexing agent is MxHyPnO(3n+1)Rz; M is any one or multiple in alkali metal ions and NH<4+>; R is acyl; the general formula of the copper salt is Cux/2HyPnO(3n+1)Rz; the general formula of the zinc salt is Znx/2HyPnO(3n+1)Rz; x, n and z are positive integers; y is 0 or a positive integer; x+y+z is equal to n+2. The cyanide-free copper-zinc alloy electroplating solution is prepared by mixing the complexing agent, the copper salt, the zinc salt and water, the complexing capacity of the complexing agent is high, the complexing constant of copper ions can be 10<26-27>, and the complexing agent is far superior to a conventional complexing agent in the prior art. The stability of the electroplating solution prepared from the complexing agent is greatly improved, the quality of the electroplating solution is high, when the cyanide-free electroplating solution is used for pre-plating, main salt metal ions in the electroplating solution are not subjected to a replacement reaction with a metal base material, a loose replacement layer structure is not formed, and the quality of the electroplating layer is greatly improved.

Description

Technical field [0001] The invention relates to an electroplating solution, in particular to a cyanide-free copper-zinc alloy electroplating solution and a preparation method thereof, and belongs to the technical field of electrochemical copper-zinc plating. Background technique [0002] Copper-zinc alloy coating has a golden yellow appearance, and can also be chemically colored on its surface to achieve special decorative effects. Therefore, it is widely used for decorative coatings, but due to the large difference between the standard potentials of copper and zinc, It is impossible to obtain an ideal alloy coating from a single salt solution, and there is still no electroplating solution that can replace cyanide copper-zinc alloy plating satisfactorily. [0003] Although the copper-zinc alloy electroplating solution containing cyanide (ie, copper-zinc cyanide electroplating solution) is used, the copper-zinc plating layer is fine and has good adhesion, and the plating solution is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 孙松华孙婧
Owner 浙江洽福科技有限公司
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