Method of environmentally friendly chemical nickel plating

An environment-friendly, electroless nickel plating technology, applied in the field of material science, can solve the problem of low corrosion resistance of the coating, and achieve the effects of high corrosion resistance, bright corrosion resistance, and excellent corrosion resistance

Active Publication Date: 2018-07-24
GUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods mainly have the main problem of low corrosion resistance of the coating (the neutral salt spray corrosion resistance time is less than 48 hours).

Method used

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  • Method of environmentally friendly chemical nickel plating

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Embodiment Construction

[0019] Embodiments of the invention: a method for environmentally friendly electroless nickel plating,

[0020] 1. Liquid preparation and tank preparation method

[0021] (1) Preparation of liquid A (for tank preparation and addition, based on the preparation of 50L)

[0022] Dissolve 12.5kg of nickel sulfate (hexahydrate) in 35L of pure water. After dissolving, add 4.5kg of citric acid (monohydrate), 2.0L of lactic acid (88%), and 1.25g of benzimidazole. Stir and mix well, then add water to 50L , adjust the pH value to 4.60±0.02 with 20% sodium hydroxide solution and 1+1 ammonia water, and save it for later use;

[0023] (2) Preparation of liquid B (for tank preparation, calculated on the basis of preparation of 50L)

[0024] First dissolve 7.5kg of sodium hypophosphite with about 35L of pure water. After dissolving, add 3.75kg of crystalline sodium acetate, 3.25kg of citric acid (monohydrate), 1.5L of lactic acid, 1.875g of benzimidazole, and 2-ethyl Sodium hexyl sulfate ...

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Abstract

The present invention discloses an environment-friendly chemical nickel plating method. According to the present invention, benzimidazole and the compounding of potassium iodide-copper sulfate respectively provide a stabilization effect and a brightening effect to a citric acid chemical nickel plating system; benzimidazole is adopted as the stabilizing agent of the citric acid chemical nickel plating system, the compounding of potassium iodide and copper sulfate is adopted as the brightening agent, all raw materials, auxiliary materials and additives are easy to buy, the plating process is simple and easy to operate, the plating liquid does not contain Pb<2+>, Cd<2+> and other toxic and harmful heavy metal ions, the plating layer has high corrosion resistance and is bright, and the method is an environment-friendly surface treatment technology, can plate a nickel-phosphorus alloy plating layer on the surface of carbon steel, aluminum alloys and other materials, and has potential application prospects and economic benefits; and with the application of the method of the present invention to perform laboratory plating, the service life of the plating liquid can achieve 8 metal cycles, the neutral salt spray corrosion resistance time of the plating layer is more than 48 h, and the brightness of the plating layer can achieve 208 Gs.

Description

technical field [0001] The invention belongs to the technical field of material science, in particular to an environment-friendly electroless nickel plating method. Background technique [0002] Electroless nickel plating technology has many advantages such as good corrosion resistance, high hardness, uniform coating, and uniform coating on the surface of parts with complex shapes. It is widely used in aviation, aerospace, automobile manufacturing, chemical and other industries. However, in the traditional electroless nickel plating process, divalent lead ions are often used as stabilizers and divalent cadmium ions as brighteners, so that the plating solution and wastewater contain Pb 2+ 、Cd 2+ Toxic and harmful heavy metal ions and other toxic and harmful heavy metal ions, the burden of subsequent wastewater treatment is heavy, which does not conform to the development trend of green surface treatment technology. [0003] The currently adopted solutions are: add thiourea ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/36
CPCC23C18/36
Inventor 刘定富李雨舒刚
Owner GUIZHOU UNIV
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