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High-dispersibility alkaline non-cyanide zinc-plating brightener and preparation method and application thereof

A technology with high dispersibility and brightening agent, applied in the field of alkaline cyanide-free electrogalvanizing surface treatment, which can solve the problems of poor covering ability and dispersion performance, low current efficiency, and narrow current density range of alkaline cyanide-free zinc plating. , to achieve the effect of less hydrogen evolution, wide current density range and low carbon content

Active Publication Date: 2020-02-28
武汉奥邦表面技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of narrow current density range, low current efficiency, poor covering ability and dispersion performance of existing alkaline cyanide-free galvanizing, the present invention provides a highly dispersible alkaline cyanide-free galvanizing brightener and its preparation method, can avoid adding complexing agent in alkaline cyanide-free zinc plating additive

Method used

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  • High-dispersibility alkaline non-cyanide zinc-plating brightener and preparation method and application thereof
  • High-dispersibility alkaline non-cyanide zinc-plating brightener and preparation method and application thereof
  • High-dispersibility alkaline non-cyanide zinc-plating brightener and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take the above basic solution, the concentration of each component in the plating solution is as follows:

[0033] Zinc (g / L) 8.0

[0034] Caustic soda (g / L) 125.0

[0035] Take 500mL of the above-mentioned plating solution and add it to the Hull cell, use the zero zinc plate as the anode, and use the copper sheet (6.5cm×20cm) with a thickness of 0.3mm as the mirror surface polished by the cloth wheel as the cathode, and place the Hull cell at a constant temperature In the water bath, control the temperature of the test piece at 25°C and the current density at 0.5A / dm 2 , electroplating for 15min, a gray loose spongy coating was obtained, figure 1 Its appearance diagram.

Embodiment 2

[0037] On the basis of embodiment 1 plating solution, add DPE-III+BPC-48 alkaline cyanide-free zinc plating brightener to be mixed with plating solution, the concentration of each component in the plating solution is as follows:

[0038]

[0039] Take 500mL of the above-mentioned plating solution and add it to the Hull cell, use the No. In the water bath, control the temperature of the test piece at 25°C and the current density at 0.5A / dm 2 , electroplating for 15 minutes, to obtain a bright coating on the whole piece, figure 2 Its appearance diagram.

Embodiment 3

[0041]In a clean and dry 1000mL four-neck flask with stirring, heating and reflux condenser, add 160g of 5-amino-8-hydroxyquinoline, 122.2g of salicylaldehyde as a substrate and 0.085g of paraformaldehyde as a catalyst, Then add 200mL of ethanol, stir until dissolved, then raise the temperature to 90°C, and react under reflux for 4h; 122g of propane sultone was added dropwise into the bottle, and after the addition was completed, the temperature was raised to 90°C to react for 2 hours to obtain an alkaline cyanide-free zinc-plating brightener.

[0042] Get the above-mentioned alkaline cyanide-free galvanizing brightener to be mixed with plating solution, the concentration of each component in the plating solution is as follows:

[0043]

[0044] Take 500mL of the above-mentioned plating solution and add it to the Hull cell, use the zero zinc plate as the anode, and use the copper sheet (6.5cm×20cm) with a thickness of 0.3mm as the mirror surface polished by the cloth wheel ...

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Abstract

The invention discloses a high-dispersibility alkaline non-cyanide zinc-plating brightener and a preparation method and application thereof and belongs to the field of surface treatment electrogalvanizing. The preparation method comprises the following steps that 5-amino-8-quinolinol and salicylic aldehyde are dissolved in an organic solvent which is mutually soluble with water at the mole ratio of 1-3:1-3, a small amount of paraformaldehyde is added as a catalyst, the temperature is raised to 80-90 DEG C, and a reflux reaction is performed for 4-5 h; after the reaction is completed, a sodiumhydroxide solution is added, the temperature is raised to 40-50 DEG C, propane sultone is dropwise added, after adding, the temperature is raised to 90-105 GEG C, after a sufficient reaction, the alkaline non-cyanide zinc-plating brightener is obtained. The mole ratio between the propane sultone and the 5-amino-8-quinolinol is 1.0-1.3:1. The current density range of a plating solution prepared from the prepared alkaline non-cyanide zinc-plating brightener is 0.5-11 A / dm<2>, when the through current is 2A, the current efficiency is higher than or equal to 80%, and the dispersive capacity reaches about 88%. The high-dispersibility alkaline non-cyanide zinc-plating brightener has good application prospect.

Description

technical field [0001] The invention relates to the field of surface treatment of alkaline cyanide-free electro-galvanizing using ZnO and NaOH as raw materials, in particular to a highly dispersible alkaline cyanide-free zinc-plating brightener and its preparation method and application. Background technique [0002] The traditional alkaline galvanizing is mainly based on cyanide galvanizing. The cyanide electroplating process has always occupied an important position in the alkaline galvanizing process because of its wide process range and high impurity tolerance, especially in the defense and military industrial products. . In the cyanide galvanizing process, cyanide is very critical. Zinc ions and cyanide form cyanide-zinc complex ions. The existence of complex ions inhibits the discharge of zinc ions at the cathode and improves the polarization of the cathode, thus playing a fine role. At the same time, because cyanide can increase the polarization of the cathode, affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22
CPCC25D3/22
Inventor 蒋晟吕明威吕志
Owner 武汉奥邦表面技术有限公司
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