A kind of cyanide-free electroplating brass plating solution containing ionic liquid additive and its application method

A technology of ionic liquids and additives, applied in the field of improving the performance of deposited coatings, can solve problems such as poor continuity of coatings, unstable copper-zinc ratio, missing plating, etc., and achieve high energy consumption, difficult maintenance and management, simple and clean process Effect

Active Publication Date: 2018-04-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the one-step cyanide-free electroplating of brass, mainly in poor continuity of the coating, unstable copper-zinc ratio, and sometimes missing plating.

Method used

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  • A kind of cyanide-free electroplating brass plating solution containing ionic liquid additive and its application method
  • A kind of cyanide-free electroplating brass plating solution containing ionic liquid additive and its application method
  • A kind of cyanide-free electroplating brass plating solution containing ionic liquid additive and its application method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] The ionic liquid [OMIM]HSO 4 Dry in vacuum at 50°C for 24 hours, in the glove box, under the protection of inert gas argon, measure [OMIM]HSO with a pipette 4 And added to the pre-prepared plating solution, in the plating solution [OMIM]HSO 4 Concentration is 5.0mg / L, keep stirring until the plating solution is fully mixed and even. The steel cord base material is degreased with acetone, washed with ethanol, washed with water, derusted with pickling, washed with water and activated as the cathode; the anode is made of brass plate (H68), polished with sandpaper, degreased with acetone, washed with water, After ethanol washing, water washing, acid washing and water washing pretreatment, it is ready for use. Add the plating solution into the plating tank, the distance between the anode and the cathode is about 4.0cm, the deposition temperature is room temperature (25±3°C), and the current density is 1.75A / dm 2 , the electrodeposition process uses a peristaltic pump to c...

example 2

[0036] The difference between this embodiment and embodiment 1 is that the ionic liquid additive added in the cyanide-free plating solution is [HMIM] HSO 4 , the concentration is 20mg / L, the plating time is 5min, and the current density is 1.5A / dm 2 , the others are the same as in Example 1. On the steel cord base material, a uniform, continuous and dense brass coating is prepared on the steel cord substrate, and its copper-zinc ratio and thickness etc. 2009 "Steel cord for rubber track" and the technical requirements of relevant national standards.

example 3

[0038] The difference between this embodiment and embodiment 2 is that the ionic liquid additive added in the cyanide-free plating solution is [BMIM] HSO 4 , the concentration is 10mg / L, the plating time is 10min, and the current density is 1.5A / dm 2, the others are the same as in Example 2. On the steel cord base material, a uniform, continuous and dense brass coating is prepared on the steel cord base material. 2009 "Steel cord for rubber track" and the technical requirements of relevant national standards.

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Abstract

The invention relates to the field of clean electroplating and provides a cyanide-free brass plating solution containing a novel ionic liquid additive aiming at the problems such as high toxicity, high environmental protection cost, complex process and high energy consumption existing in preparation of a steel cord brass coating by using the traditional cyanide process and thermal diffusion method and the defects that the cyanide-free electroplating brass coating is low in continuity and instable in copper-zinc ratio and has a plating leakage phenomenon and the like. The plating solution consists of 200-270 g / L of potassium pyrophosphate trihydrate (A), 1-2g / L of copper sulfate pentahydrate (B), 35-45g / L of zinc sulfate heptahydrate (C), 0.1-0.6ml / L of hydrogen peroxide (D) and 1.0-20mg / L of ionic liquid (E). The operating conditions are as follows: the pH value is equal to 8.50 to 9.20, the current density is 1.5-2.0A / dm<2>, the temperature refers to room temperature, the plating time refers to 5-10 minutes, and the circular flow of the plating solution is 2200ml / min. The brass coating which is high in binding force with a matrix, uniform, continuous and dense is prepared, and the copper-zinc ratio, thickness and other plating performances meet the technical requirements on the GB / T 24245-2009 steel cords for rubber belt tracks and related national standards.

Description

technical field [0001] The invention relates to the field of clean electroplating, in particular to improving the properties of deposited coatings by adding ionic liquids to a cyanide-free electroplating brass system. Background technique [0002] Electroplated brass (copper-zinc alloy) coatings are widely used in industrial production, among which functional brass coatings are mainly used for steel cords of radial tires. Because steel cord steel wire and rubber are two completely different materials, there is almost no bonding force between the two, only after the surface of the steel wire is coated with copper, zinc, bronze (copper-tin alloy) or brass (copper-zinc alloy) , the steel wire will have different degrees of bonding force with the rubber, and the bonding force between the brass coating and the rubber is the best. [0003] There are traditionally two methods for electroplating brass on steel cords: cyanidation and thermal diffusion. The cyanidation method is a t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/38C25D5/00
CPCC25D3/38C25D5/00
Inventor 张锁江杜文朝王倩吕兴梅
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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