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Nickel-chromium alloy electroplate liquid

A nickel-chromium alloy and electroplating solution technology, which is applied in the field of metal surface treatment, can solve the problems of thick coating and thick coating adhesion, uneven coating distribution and composition, incomplete cathode discharge and other problems, so as to improve the coating quality, Production management is easy to master, and the effect of promoting and applying value is good

Inactive Publication Date: 2015-04-22
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carrying out nickel-chromium alloy plating on the basis of trivalent chromium plating solution has many deficiencies, such as Cr 3+ and Ni 2+ It is not completely clear in which form of ligand to discharge at the cathode, Cr 3+ Hydroxyl bridge compounds are formed near the cathode, which causes a large amount of hydrogen evolution in the cathode, resulting in low current efficiency and rough coating; and the stability of the plating solution, the prevention and control of pollution, the uneven distribution and composition of the coating, the thickness of the coating and the binding force of the thick coating. problems etc. are flawed
[0004] Based on the above defects, the choice of complexing agent in the plating solution is the core, and some processes choose to add a bipolar, aprotic, neither alkali nor acid substance - dimethylformamide (DMF). There are citric acid, glycine and glycolic acid, etc. The performance of the plating solution has been slightly improved, but there are still many problems

Method used

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  • Nickel-chromium alloy electroplate liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The formula of the electroplating solution is: each liter of the electroplating solution contains 35g of nickel sulfate hexahydrate, 80g of chromium trichloride hexahydrate, 40ml of formic acid, 30g of boric acid, 30g of urea, 60g of ammonium chloride, 40g of potassium chloride, 60g of citric acid, dodecane 0.1g of sodium base sulfate, 1.5g of saccharin, 2ml of 791 nickel plating brightener, and the rest is water.

[0018] Preparation of electroplating solution: According to the above formula, take each raw material accurately, first boil sodium lauryl sulfate for 15-20 minutes for later use, then put other raw materials in a 1-liter container in turn, add 800ml of water, heat at 80-90°C and stir to dissolve , continue to stir for 5 minutes, cool down, and finally add boiled sodium lauryl sulfate solution and 791 nickel plating brightener, add water to dilute to 1 liter, stir evenly, control the temperature at 60-70°C, and test plating for 1 hour.

Embodiment 2

[0020] The formula of electroplating solution is: per liter of electroplating solution contains 30g of nickel sulfate hexahydrate, 80g of chromium trichloride hexahydrate, 35ml of formic acid, 28g of boric acid, 40g of urea, 50g of ammonium chloride, 50g of potassium chloride, 50g of citric acid, dodecane Sodium base sulfate 0.11g, saccharin 2g, 791 nickel plating brightener 3ml, the rest is water.

[0021] The preparation of electroplating solution: with embodiment 1.

Embodiment 3

[0023] Each liter of electroplating solution contains 25g of nickel sulfate hexahydrate, 90g of chromium trichloride hexahydrate, 30ml of formic acid, 20g of boric acid, 60g of urea, 30g of ammonium chloride, 60g of potassium chloride, 30g of citric acid, and 0.1g of sodium lauryl sulfate , saccharin 2.5g, 791 nickel plating brightener 3ml, and the rest is water.

[0024] The preparation of electroplating solution: with embodiment 1.

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Abstract

The invention relates to nickel-chromium alloy electroplate liquid. A liter of the electroplate liquid comprises from 25g to 35g of nickel sulfate hexahydrate, from 80g to 100g of chromium trichloride hexahydrate, from 30ml to 40ml of formic acid, from 20g to 30g of boric acid, from 1g to 60g of urea, from 30g to 80g of ammonium chloride, from 40g to 60g of potassium chloride, from 30g to 60g of critic acid, from 0.1g to 0.12g of sodium dodecyl sulfate, from 1.5g to 2.5g of saccharin, from 2ml to 4ml of nickel plating brighteners and the balance water. The urea is used as a coordination additive, and the performance of the electroplate liquid is greatly improved, so that behaviors of electrodes, the covering power and the dispersing power of a cathode and the stability, the coating performance and the contamination status of the electroplate liquid are greatly improved.

Description

technical field [0001] The invention relates to a nickel-chromium alloy electroplating solution, which belongs to the technical field of metal surface treatment. Background technique [0002] Electroplated nickel-chromium alloy has attracted people's attention for its excellent coating performance, such as corrosion resistance, wear resistance and good decorative effect of the coating. The application range is extremely wide, and some coatings can replace chrome-plated products, especially depositing a layer of nickel-chromium alloy on the surface of metal materials, which can improve the corrosion resistance of the substrate, thereby reducing the amount of stainless steel and saving chromium resources. [0003] The electroplating nickel-chromium alloy technology in the early years used hexavalent chromium plating solution. Because hexavalent chromium is a highly toxic and carcinogenic pollutant, the rapid development of this technology has been hindered. With the rise of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56
Inventor 殷平张丕俭王增娣曲荣君刘希光张江徐强
Owner LUDONG UNIVERSITY
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