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Alkaline cyanide-free Zn-Ni-Al2O3 electroplating solution, and preparation method and application thereof

An electroplating solution and alkaline technology, applied in the direction of electrolytic paint, coating, etc., can solve the problems of high environmental and human hazards, high toxicity of cyanide, low current efficiency, etc., and achieve low pollution of waste liquid, easy treatment, high current density high effect

Inactive Publication Date: 2018-11-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The basic cyanide is highly toxic and harmful to the environment and human beings, so a basic cyanide-free Zn-Ni-Al was developed. 2 o 3 Electroplating solution is especially important
But the existing basic cyanide-free Zn-Ni-Al 2 o 3 There are still some problems in the composite coating, especially the low current efficiency (50% to 75%), low hardness and poor stability, which limit the application.

Method used

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  • Alkaline cyanide-free Zn-Ni-Al2O3 electroplating solution, and preparation method and application thereof
  • Alkaline cyanide-free Zn-Ni-Al2O3 electroplating solution, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: Alkaline cyanide-free Zn-Ni-Al 2 o 3 The electroplating solution is composed of: 1-aminohydantoin 35g / L, tetraethylenepentamine 5g / L, potassium carbonate 100g / L, zinc sulfate 60g / L, nickel sulfate 30g / L, Al 2 o 3 Nanoparticle suspension 10ml / L, copper sheet after alkaline degreasing, pickling (hydrochloric acid: water = 1:1) and water washing as cathode, inert metal as anode (Pt sheet), the distance between cathode and anode is 5cm, bath temperature is 50℃, pH value is 10, current density is 2A / dm 2 , the stirring speed is 500rpm, the electroplating time is 10min, and the current efficiency of the obtained plating solution is 87%. 2 o 3 The content is 0.86wt.%.

Embodiment 2

[0020] Embodiment 2: Alkaline cyanide-free Zn-Ni-Al 2 o 3 The composition of the electroplating solution is: 3-hydroxymethyl-5,5-diphenylhydantoin 120g / L, glycine 10g / L, potassium carbonate 100g / L, zinc sulfate 60g / L, nickel sulfate 30g / L, al 2 o 3 Nanoparticle suspension 20ml / L, copper sheet after alkaline degreasing, pickling (hydrochloric acid: water = 1:1) and water washing as cathode, inert metal as anode (Pt sheet), the distance between cathode and anode is 10cm, bath temperature is 60℃, pH value is 8, current density is 1A / dm 2 , the stirring speed is 1000rpm, the electroplating time is 20min, the current efficiency of the obtained plating solution is 88%, the appearance of the plating layer is bright, the hardness is high, the stability of the plating solution is good, the Ni content of the plating layer is 13.24wt.%, Al 2 o 3The content is 0.94wt.%.

Embodiment 3

[0021] Embodiment 3: Alkaline cyanide-free Zn-Ni-Al 2 o 3 The composition of the electroplating solution is: 1,3-dibromo-5,5-dimethylhydantoin 60g / L, potassium tartrate 30g / L, potassium carbonate 120g / L, zinc sulfate 80g / L, nickel sulfate 55g / L , Al 2 o 3 Nanoparticle suspension 15ml / L, copper sheet after alkaline degreasing, pickling (hydrochloric acid: water = 1:1) and water washing as cathode, inert metal as anode (Pt sheet), the distance between cathode and anode is 10cm, bath temperature is 60℃, pH value is 9, current density is 3A / dm 2 , the stirring speed is 800rpm, the electroplating time is 30min, and the current efficiency of the obtained plating solution is 86%. 2 o 3 The content is 0.84wt.%.

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Abstract

The invention belongs to the technical field of electroplating of Zn-Ni-Al2O3 composite coatings, and relates to an alkaline cyanide-free Zn-Ni-Al2O3 electroplating solution, and a preparation methodand application thereof. The plating solution is prepared from a primary coordinating agent, an auxiliary coordinating agent, zinc sulfate, nickel sulfate, potassium carbonate, an Al2O3 nanoparticle suspension and ultrapure water, wherein the main coordinating agent is hydantoin and derivatives thereof, and the auxiliary coordinating agent is amine organic matter such as ethylenediamine; the composite coatings are prepared according to an electrodeposition method. The alkaline cyanide-free Zn-Ni-Al2O3 electroplating solution, and the preparation method and the application thereof have the advantages that the electroplating process is optimized by screening and applying the coordinating agents, and the obtained coatings have high corrosion resistance and high hardness; the electroplating solution has high stability and high current density (higher than 85%), and its overall performance is improved remarkably as compared with that of a single coordinating agent.

Description

technical field [0001] The invention belongs to electroplating Zn-Ni-Al 2 o 3 Composite coating technology field, relates to an alkaline cyanide-free Zn-Ni-Al 2 o 3 Electroplating solution, preparation method and application. Background technique [0002] According to statistics, my country loses 6 million tons of steel due to corrosion every year, causing direct economic losses of up to tens of billions of yuan, so the anticorrosion of steel is particularly important. Compared with other anti-corrosion methods, electrodeposition is one of the most important methods of metal anti-corrosion treatment. It has the characteristics of high processing efficiency, low cost, simple operation and easy industrialization. Electrodeposition of an anti-corrosion coating on the surface of steel is a solution to steel corrosion. the most effective means. At present, cadmium coatings have attracted people's attention because of their good corrosion resistance, wear resistance, and high...

Claims

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Application Information

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IPC IPC(8): C25D15/00C25D3/56
CPCC25D3/565C25D15/00
Inventor 冯忠宝王琳邢鹏飞安茂忠
Owner NORTHEASTERN UNIV
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