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Carrier brightener precursor and carrier brightener for alkaline zinc-plating or zinc alloy electroplating solution and electroplating solution

A technology of carrier brightener and electroplating solution, applied in the field of carrier brightener, electroplating solution, and carrier brightener precursor, can solve the problems of easy "foaming" of the coating, low cathode current efficiency, good dispersion ability of the carrier brightener, etc.

Active Publication Date: 2014-07-30
SHAOGUAN MEITUO WEIZHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Through investigation and research on the carrier brighteners published so far for alkaline cyanide-free galvanizing, it is found that some carrier brighteners have good dispersion ability and strong protection function for high areas, but the total cathodic current efficiency is low and the leveling is not enough Well, some carrier brighteners have a good effect on the grain refinement of the coating, and the coating brightness is good, but the tolerance to the main brightener traditionally used in the galvanizing industry - benzylidene pyridinium-3-carboxylate is very poor , that is to say, the internal stress of the coating is very large, and the coating is easy to "bubble", and the phenomenon of "bubble" often occurs after a few weeks, which leads to claims and lawsuits in the electroplating industry

Method used

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  • Carrier brightener precursor and carrier brightener for alkaline zinc-plating or zinc alloy electroplating solution and electroplating solution
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  • Carrier brightener precursor and carrier brightener for alkaline zinc-plating or zinc alloy electroplating solution and electroplating solution

Examples

Experimental program
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Effect test

Embodiment 1

[0091] Example 1 Carrier Brightener Precursor Mixed Amine Used in Alkaline Zinc Plating or Zinc Alloy Electroplating Bath and Preparation Method thereof

[0092] The urea or urea calculated according to the reaction formula and the urea homologue (N-methylurea or N-phenylurea) of the general structural formula (four), and the compound (3- Dimethylaminopropylamine or 2-dimethylaminoethylamine) into a three-necked flask equipped with stirring, condensing and reflux, temperature measuring (controlling) devices and heating devices, and the end of the reflux condenser should be connected to an ammonia absorption device (use 10% dilute sulfuric acid as absorbent). Replace the air in the system with nitrogen. The temperature was raised while stirring, and when the temperature rose to 110°C, the mixture became homogeneous, and a small amount of ammonia gas began to evolve. As the temperature rises, the release rate of ammonia gas will increase. Control it at the rate of temperature ...

Embodiment 2

[0095] Embodiment 2 is used for the carrier brightener in alkaline galvanizing or zinc alloy electroplating solution and preparation method thereof

[0096] Add a known amount of precursor mixed amines into the three-necked flask. Prepare and measure pure water. The amount of pure water added is 100-105% of the total amount of other substances participating in the reaction, so that the solid content of the carrier brightener in the obtained product is 45%. Dissolve the calculated amount of sodium hydroxide in the prepared pure water, then add it into the three-necked flask, and dissolve it with the mixed amine while stirring. The reaction device should be equipped with a stirring, condensing and reflux device, a temperature measuring (controlling) device, a heating device and a separatory funnel for feeding. Add the calculated linking agent into the separating funnel, heat up while stirring, and add the linking agent dropwise from the separating funnel to the reactant when th...

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Abstract

The invention discloses a carrier brightener precursor for an alkaline zinc-plating or zinc alloy electroplating solution. The carrier brightener precursor is obtained by carrying out a one-time chemical reaction of a mixed amine of one amide functional group-containing ditertiary amine and one or more amide functional group-containing monotertiary amines. The invention also discloses a carrier brightener for the alkaline zinc-plating or zinc alloy electroplating solution. The carrier brightener is a random intercondensation polymer; and components participating copolycondensation mainly comprise the following two components: the carrier brightener precursor mixed amine and one or more bridging agents. The intercondensation polymer used as the carrier brightener of the alkaline zinc-plating or zinc alloy electroplating solution has quite good compatibility with a main brightening agent benzyl pyridinium-3-carboxylate which is widely used at present, dependence on sulfonated aromatic aldehyde can be reduced, on one hand, the tendency of blistering of a plating layer is overcome, an operating window is expanded, and at the same time, the dispersion property of the plating solution is relatively improved; and a high-brightness electroplating layer having high dispersibility and high covering power also can be obtained, and the plating layer has excellent spalling (foaming) resistant performance.

Description

technical field [0001] The invention belongs to the technical field of alkaline galvanizing or zinc alloy electroplating solution, and in particular relates to a carrier brightener precursor used in alkaline galvanizing or zinc alloy electroplating solution, a carrier brightener and an electroplating solution. Background technique [0002] The electrodeposition of zinc or zinc alloys based on sodium zincate has been known for many years. It is not possible to obtain industrially valuable electrodeposited layers with simple sodium zincate electrolytes because the electrodeposits obtained are powdery and Dendritic crystals. Therefore, it has been proposed to use various additives to improve this situation, such as using sodium cyanide, using CN- to complex the zinc ion, increasing the overvoltage of the cathode reaction, and reducing the Zn 2+ The deposition rate at the cathode can obtain an industrially valuable electrodeposited layer. This method has been used in the indust...

Claims

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Application Information

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IPC IPC(8): C25D3/22C25D3/56C08G73/00
Inventor 高瑛吴成勇郑镜飞
Owner SHAOGUAN MEITUO WEIZHI CHEM
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