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Alkaline electrolyte and method for preparing bright nickel by means of electrolysis in alkaline electrolyte

An electrolyte and bright nickel technology, applied in the field of non-ferrous metallurgy, can solve the problems of nickel blackening and brittleness, and achieve good toughness

Inactive Publication Date: 2016-08-31
YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to address the deficiency of the existing boric acid system and the problem that nickel is blackened and brittle by electrolysis of the nickel-ammonia complex alkaline system, and proposes an alkaline electrolyte and a method for electrolytically preparing bright nickel in the alkaline system. method, the alkaline electrolyte can effectively solve the problem that the deposited nickel layer is black and brittle by adding an appropriate amount of sodium benzenesulfinate to the nickel-ammonia complex alkaline system, and successfully prepares bright nickel. This method has current efficiency High, the prepared nickel is bright, good toughness and other advantages

Method used

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  • Alkaline electrolyte and method for preparing bright nickel by means of electrolysis in alkaline electrolyte

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Effect test

Embodiment 1

[0033] Configure 250 mL of electrolyte solution containing 50 g / L of nickel chloride, 80 g / L of ammonium chloride, 30 g / L of ammonia water, and 0.03 g / L of sodium benzenesulfinate. Take the anode of the thick nickel electrode and immerse it in 1mol / L nitric acid for 60 minutes to remove the surface oxide layer and impurities, take it out, rinse it with deionized water, and dry it with cold air. Using stainless steel as the cathode material, after grinding with 1#, 3#, and 5# sandpaper, degreasing with absolute ethanol, washing with deionized water and drying with cold air, put the cathode and anode into the electrolytic cell at the same time, and control the electrodeposition temperature to 25℃, the current density is -500A / m 2 , Stir the electrolyte at a speed of 650r / min. After 0.5h of electrodeposition, take out the cathode, rinse the residual electrolyte on the surface with water, dry it with cold air, and peel off the nickel from the stainless steel to obtain high-purity ...

Embodiment 2

[0036] Prepare 250 mL of electrolyte solution containing 400 g / L of nickel chloride, 450 g / L of ammonium chloride, 350 g / L of ammonia water, and 1 g / L of sodium benzenesulfinate. Take the anode of the thick nickel electrode, soak it in 5mol / L nitric acid for 10min to remove the surface oxide layer and impurities, take it out, rinse it with deionized water, and dry it with cold air. Using stainless steel as the cathode material, after grinding with 1#, 3#, and 5# sandpaper, degreasing with absolute ethanol, washing with deionized water and drying with cold air, put the cathode and anode into the electrolytic cell at the same time, and control the electrodeposition temperature to 65℃, the current density is -100A / m 2 , Stir the electrolyte at a speed of 250r / min. After 100 hours of electrodeposition, take out the cathode, rinse the residual electrolyte on the surface with water, dry it with cold air, and peel off the nickel from the stainless steel to obtain high-purity nickel w...

Embodiment 3

[0039] Configure 250 mL of electrolyte containing 80 g / L of nickel chloride, 100 g / L of ammonium chloride, 50 g / L of ammonia water, and 0.05 g / L of sodium benzenesulfinate. Take the anode of the thick nickel electrode and immerse it in 2mol / L nitric acid for 40min to remove the surface oxide layer and impurities, take it out, rinse it with deionized water, and dry it with cold air. Using stainless steel as the cathode material, after grinding with 1#, 3#, and 5# sandpaper, degreasing with absolute ethanol, washing with deionized water and drying with cold air, put the cathode and anode into the electrolytic cell at the same time, and control the electrodeposition temperature to 40℃, the current density is -400A / m 2 , Stir the electrolyte at a speed of 500r / min. After 1 hour of electrodeposition, take out the cathode, rinse the residual electrolyte on the surface with water, dry it with cold air, and peel off the nickel from the stainless steel to obtain high-purity nickel with...

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Abstract

The invention discloses an alkaline electrolyte and a method for preparing bright nickel by means of electrolysis in the alkaline electrolyte. The alkaline electrolyte comprises nickel chloride, ammonium chloride, ammonia water, benzene sulfinic acid sodium salt and water, wherein the concentration of nickel chloride is 50g / L to 400g / L; the concentration of ammonium chloride is 80g / L to 450g / L; the concentration of ammonia water is 30g / L to 350g / L; the concentration of benzene sulfinic acid sodium salt is 0.03g / L to 1g / L. The method for preparing bright nickel by means of electrolysis in the alkaline electrolyte comprises the following steps: (1) preparing the alkaline electrolyte; (2) removing surface oxide layers of a cathode material, degreasing the cathode material, and soaking an anode material in nitric acid to remove the surface oxide layers and impurities; (3) performing electro-deposition on the pretreated cathode material and anode material in an electrolytic cell containing the alkaline electrolyte to obtain a bright and smooth nickel layer. The alkaline electrolyte disclosed by the invention is capable of effectively solving the difficult problem that a deposited nickel layer is black and fragile and can be used for successfully preparing bright nickel; the method has the advantages that the current efficiency is high, the prepared nickel is bright and good in toughness and the like.

Description

(1) Technical field [0001] The invention relates to an alkaline electrolyte and a method for electrolytically preparing bright nickel in the alkaline electrolyte, belonging to the technical field of nonferrous metallurgy. (2) Background technology [0002] In the current electrolytic industrial production of nickel, the bright nickel is mainly prepared by electrolysis with the Watts nickel plating solution of the boric acid system. This process has been continuously improved and matured after decades of transformation and innovation. The progress of the traditional electrolytic nickel process is increasingly revealing its shortcomings in production. The disadvantages of the traditional electrolytic nickel process are as follows: [0003] 1. Using acidic system electrolytic nickel process, using boric acid as a buffer, it is necessary to strictly control the pH within the range of 4.5 to 5.4. If the pH is too low, the efficiency of the cathode will decrease, and if the pH is...

Claims

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Application Information

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IPC IPC(8): C25D3/12C25D5/34C25D5/36C25D5/40
CPCC25D3/12C25D5/34C25D5/36C25D5/40
Inventor 伍廉奎郑国渠曹华珍
Owner YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH
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