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Acidic chemical nickel plating composite brightening agent and its use method

A technology of electroless nickel plating and brightener, which is applied in the field of chemical treatment of the surface of metal materials. It can solve the problems of ineffective electroless plating, complex composition of electroless plating solution, and damage to the plating solution by decomposition products, so as to improve the stability of the plating solution. properties, brightening, and low surface stress

Inactive Publication Date: 2008-02-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex composition and many influencing factors of the electroless plating solution, its mechanism of action is different from that of electroplating, so the effect of the brightener introduced from the electroplating solution on the electroless plating is not very obvious.
The existing electroless nickel plating brighteners or use toxic heavy metal cadmium and lead divalent ions; or the plating solution is unstable, and the decomposition products harm the plating solution; or the price is expensive, which limits its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Primary Brightener: Sodium Benzene Sulfinate 1g

[0028] Secondary brightener: Coumarin 1g

[0029] Thiourea 0.1g

[0030] Auxiliary brightener: sodium allyl sulfonate 10g

[0031] Prepare 1 liter of composite brightener solution, take 2.5ml and add it to the basic plating solution, adjust the pH value to 7.0, heat to 70°C, and then apply plating.

Embodiment 2

[0033] Primary Brightener: Sodium Benzene Sulfinate 15g

[0034] Secondary brightener: Coumarin 10g

[0035] Thiourea 0.1g

[0036] Auxiliary brightener: sodium allyl sulfonate 150g

[0037] Prepare 1 liter of composite brightener solution, take 5ml and add it to the basic plating solution, adjust the pH value to 7.0, heat to 70°C, and then apply plating.

Embodiment 3

[0039] Primary brightener: benzenesulfonic acid 1g

[0040] Secondary brightener: Coumarin 1g

[0041] Thiourea 0.1g

[0042] Auxiliary brightener: sodium allyl sulfonate 10g

[0043] Prepare 1 liter of composite brightener solution, take 2.5ml and add it to the basic plating solution, adjust the pH value to 5.20, heat to 80°C, and then apply plating.

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Abstract

A composite brightening agent for the acidic chemical plating of Ni layer is composed of primary, secondary and auxiliary brightening agents. Its application method includes such steps as slowly adding it to chemical plating liquid using diluted sulfuric acid solution to regulate pH=4.5-7.0, heating to 70-95 deg.C, activating the deoiled workpiece by diluted sulfuric solution, and immersing it in the plating liquid.

Description

technical field [0001] The invention relates to the technical field of chemical surface treatment of metal materials, in particular to an acidic electroless nickel plating composite brightener and its application method. technical background [0002] Electroless nickel-phosphorus alloy, as a new type of excellent engineering material, has become the focus of research and development by domestic and foreign scientific research institutes and production enterprises. It is an emerging surface treatment technology that uses oxidation-reduction reaction to deposit a layer of alloy coating on the catalytic surface. The obtained electroless nickel-phosphorus alloy coating has good corrosion resistance and wear resistance, uniform coating thickness and high hardness. , and good imitation, and thus widely used in chemical machinery, aerospace and other fields. [0003] For a long time, electroless nickel plating has been used as a functional coating, and its surface brightness is no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F3/06
Inventor 严密应华根贺雪峰
Owner ZHEJIANG UNIV