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A kind of environment-friendly cyanide-free alkaline galvanizing electroplating solution and galvanizing process

A cyanide-free alkaline galvanizing and electroplating solution technology, applied in electrolytic process, electrolytic components, cells, etc., can solve the problems of uneven coating thickness, imperfect coating, air flow, scars, etc., and achieve good coating adhesion and improve Surface gloss and stability, surface leveling effect

Active Publication Date: 2018-03-23
广东比格莱科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These intermediates individually or in combination have a certain brightness-enhancing effect, but they are not perfect for the coating. Only the main light agent is added to the base liquid. Although the brightness of the coating can be greatly displayed, it cannot fully Dissolve into the bulk plating solution and evenly absorb and wet the metal / solution interface, resulting in inevitable airflow and scars on the metal surface, especially in the high current area, and even foggy and missing plating in the low current area
The crystal grains are large, the thickness of the coating is extremely uneven, and the brittleness is relatively large

Method used

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  • A kind of environment-friendly cyanide-free alkaline galvanizing electroplating solution and galvanizing process

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Embodiment 1

[0040] An environment-friendly cyanide-free alkaline galvanizing electroplating solution provided by the invention, said cyanide-free alkaline galvanizing electroplating solution is composed of the following components:

[0041] Zinc 10 g / L

[0042] Sodium hydroxide 130 g / L

[0043] Regulator 25 ml / L

[0044] Cylinder opener 6 ml / L

[0045] Brightener 1 ml / L

[0046] Humectant 0.1 ml / L

[0047] Wherein, the brightener is prepared by the following method: 10 parts of polyethyleneimine, 15 parts of imidazole propoxy condensate, 25 parts of nitrogen heterocyclic derivatives, 13 parts of modified aromatic aldehyde compounds and 400 parts of water Add it into the reactor and raise the temperature to 45°C; add 70 parts of epichlorohydrin into the dropping funnel, slowly drop it into the reactor and stir the reaction, the reaction temperature does not exceed 45°C, and the dropping time is 3~5 h; after Step S2 After the dropwise addition of epichlorohydrin is completed, the tempe...

Embodiment 2

[0050] An environment-friendly cyanide-free alkaline galvanizing electroplating solution provided by the invention, said cyanide-free alkaline galvanizing electroplating solution is composed of the following components:

[0051] Zinc 11 g / L

[0052] Sodium hydroxide 140 g / L

[0053] Regulator 27 ml / L

[0054] Cylinder opener 7 ml / L

[0055] Brightener 2 ml / L

[0056] Humectant 0.2 ml / L

[0057]Wherein, the brightener is prepared by the following method: 15 parts of polyethyleneimine, 20 parts of imidazole propoxy condensate, 30 parts of nitrogen heterocyclic derivatives, 18 parts of modified aromatic aldehyde compounds and 450 parts of water Add it into the reactor and raise the temperature to 45°C; add 75 parts of epichlorohydrin into the dropping funnel, slowly drop it into the reactor and stir the reaction, the reaction temperature does not exceed 45°C, and the dropping time is 3~5 h; after Step S2 After the dropwise addition of epichlorohydrin is completed, the temper...

Embodiment 3

[0060] An environment-friendly cyanide-free alkaline galvanizing electroplating solution provided by the invention, said cyanide-free alkaline galvanizing electroplating solution is composed of the following components:

[0061] Zinc 12 g / L

[0062] Sodium hydroxide 145 g / L

[0063] Regulator 30 ml / L

[0064] Cylinder opener 8 ml / L

[0065] Brightener 3 ml / L

[0066] Humectant 0.3 ml / L

[0067] Wherein, the brightener is prepared by the following method: 20 parts of polyethyleneimine, 25 parts of imidazole propoxy condensate, 35 parts of nitrogen heterocyclic derivatives, 13~23 parts of modified aromatic aldehyde compounds and 500 parts Add part of water into the reactor, raise the temperature to 45°C; add 80 parts of epichlorohydrin into the dropping funnel, slowly drop into the reactor and stir for reaction, the reaction temperature does not exceed 45°C, and the dropping time is 3~5 h ; After the epichlorohydrin is added dropwise in step S2, the temperature of the react...

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Abstract

The invention relates to the technical field of electroplating, and discloses an environment-friendly cyanide-free alkaline galvanizing electroplating solution and a galvanizing process. The cyanide-free alkaline zinc plating solution is composed of the following components: zinc 10~12 g / L, sodium hydroxide 130~145 g / L, 51011 regulator 25~30 ml / L, 51012 cylinder opening agent 6~8 ml / L, 51015 brightener 1~3 ml / L, 51016 wetting agent 0.1~0.3 ml / L; wherein, the brightener is composed of polyethyleneimine, imidazole propoxy condensate, nitrogen heterocyclic derivatives , Modified aromatic aldehydes, epichlorohydrin and water. The environment-friendly cyanide-free alkaline galvanizing electroplating solution and galvanizing process provided by the present invention not only improve the brightness of the galvanized layer, but also have a thickness of up to 30 microns without brittleness, and make the dispersing ability and covering ability of the plating solution exceed the traditional alkaline galvanizing brightener.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an environment-friendly cyanide-free alkaline galvanizing electroplating solution and a galvanizing process. Background technique [0002] For a long time in the past, the cyanide galvanizing process has been widely used because of the good stability of the cyanide plating solution, strong throwing ability, fine coating, and good corrosion resistance. However, due to the severe hydrogen evolution in the cyanide galvanizing process, the galvanized layer is very brittle, and the cyanide galvanizing solution is highly toxic, the wastewater treatment is difficult, and the air and groundwater are seriously polluted. Galvanizing and weak acid galvanizing processes are gradually developed and used in industrial electroplating to replace cyanide galvanizing. Compared with the cyanide galvanizing process, the destructive power of the alkaline galvanizing process to the environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/22C25D21/10
Inventor 陈楷城
Owner 广东比格莱科技有限公司
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