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Trivalent chromium electrolytic solution, preparation method and application thereof in electroplating stainless steel work piece

An electroplating solution and trivalent chromium technology, applied in the field of electrochemistry, can solve the problems of difficult chromium plating, high impurity sensitivity, immaturity, etc., and achieve the effects of thick brightness, good coating adhesion, and good wetting effect.

Inactive Publication Date: 2010-06-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of trivalent chromium electroplating is not mature at present, mainly because it is highly sensitive to impurities and it is not easy to plate thick chromium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Add 15g of chromium chloride hexahydrate into 65ml of deionized water, stir until completely dissolved and then add 90g of ammonium chloride and 235ml of deionized water at a mass ratio of 1:6 of chromium chloride hexahydrate / ammonium chloride, while adding While stirring until it completely dissolves; then add 40g of ammonium formate and 50ml of deionized water at a mass ratio of chromium chloride hexahydrate / ammonium formate of 1:2.67, and stir while adding until it dissolves completely; then press chromium chloride hexahydrate Add 8g ammonium bromide and 30ml deionized water at a mass ratio of 1:0.53 of ammonium bromide, stir while adding until fully dissolved; then add 70g at a mass ratio of 1:4.67 of chromium chloride hexahydrate / potassium chloride Potassium chloride and 120ml deionized water, stir while adding until it dissolves completely; Then add 40g boric acid and 130ml deionized water by the mass ratio of chromium chloride hexahydrate / boric acid 1: 2.67, stir ...

example 2

[0022] Add 20g of chromium chloride hexahydrate into 65ml of deionized water, stir until completely dissolved and then add 100g of ammonium chloride and 235ml of deionized water at a mass ratio of 1:5 of chromium chloride hexahydrate / ammonium chloride, while adding While stirring until it is completely dissolved; then add 60g of ammonium formate and 50ml of deionized water at a mass ratio of chromium chloride hexahydrate / ammonium formate of 1:3, and stir while adding until it is completely dissolved; then press chromium chloride hexahydrate Add 12g ammonium bromide and 30ml deionized water at a mass ratio of 1:0.6 of ammonium bromide, stir while adding until fully dissolved; then add 80g at a mass ratio of 1:4 of chromium chloride hexahydrate / potassium chloride Potassium chloride and 120ml deionized water, stir until it is completely dissolved while adding; Then add 70g boric acid and 130ml deionized water according to the mass ratio of 1: 3.5 of chromium chloride hexahydrate / b...

example 3

[0025] Add 18g of chromium chloride hexahydrate to 65ml of deionized water, stir until completely dissolved and then add 95g of ammonium chloride and 235ml of deionized water at a mass ratio of 1:5.28 of chromium chloride hexahydrate / ammonium chloride, while adding While stirring until it is completely dissolved; then add 50g of ammonium formate and 50ml of deionized water at a mass ratio of chromium chloride hexahydrate / ammonium formate of 1:2.78, and stir while adding until it is completely dissolved; then press chromium chloride hexahydrate Add 10g ammonium bromide and 30ml deionized water at a mass ratio of 1:0.56 of ammonium bromide, stir while adding until fully dissolved; then add 70g at a mass ratio of 1:3.89 of chromium chloride hexahydrate / potassium chloride Potassium chloride and 120ml deionized water, add while stirring until it dissolves completely; Then add 60g boric acid and 130ml deionized water according to the mass ratio of chromium chloride hexahydrate / boric ...

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Abstract

The invention relates to trivalent chromium electrolytic solution. The raw material comprises the following components by concentration: 15-20g / L of chromic chloride hexahydrate, 40-60g / L of ammonium formate, 70-80g / L of potassium chloride, 40-50g / L of potassium sulphate, 90-100g / L of ammonium chloride, 8-12g / L of ammonium bromide, 40-70g / L of boric acid, 2ml / L of polyoxyethylene actyl phenolic ether, 2ml / L of glycerine, and appropriate sulphuric acid capable of regulating pH to be 4-5. The preparation method includes that: (1) ammonium chloride solution is added into chromic chloride solution, full stirring is carried out for dissolution; (2) ammonium formate, boric acid, polyoxyethylene actyl phenolic ether and glycerine are added in ratio; (3) then low temperature heating in water bath at 40 DEG C is carried out to dissolve undissolved substance in confecting process; (4) leaching and aging are carried out after confecting is finished, thus obtaining the trivalent chromium electrolytic solution. Nickel plated and aluminium plated work piece is firstly washed by acid, trivalent chromium electrolytic solution is used for electroplating, the conditions include that: working temperature is room temperature, current density is 15-30A / dm2, appropriate sulphuric acid is used for regulating pH of electrolytic solution to be 4-5, electroplating time is 10-40min, and anode electrode is high-purity graphite electrode; and water is used for cleaning work piece after electroplating, and drying is carried out. The electrolytic solution prepared by the invention is easy to prepare and has low toxicity.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a trivalent chromium electroplating solution and a preparation method thereof, as well as its electroplating application on nickel-plated and aluminum-plated workpieces. Background technique [0002] Electroplating products, especially chrome-plated products, are indispensable to people's production and life on the one hand; on the other hand, a series of pollutants are produced during the chrome-plating process, which pollutes the living environment of human beings. However, due to the high hardness of the hexavalent chromium coating, good wear resistance, good heat resistance, strong reflective ability, simple process, and convenient maintenance, chromium technology has always used hexavalent chromium (chromic acid) as the main electroplating raw material. Hexavalent chromium is very toxic, about a hundred times that of trivalent chromium. Hexavalent chromium wastewater ...

Claims

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Application Information

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IPC IPC(8): C25D3/06
Inventor 殷恒波张运生王爱丽陈维广卢章准任敏尹常庆张文辉
Owner JIANGSU UNIV
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