Wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process

A cyanide-free alkaline galvanizing, bright type technology, which is applied in the wide bright cyanide-free alkaline galvanizing process, wide temperature, wide current field, can solve the uneven coating thickness, air flow, scars, large crystal grains, etc. problem, to achieve the effect of bright coating, easy passivation and low brittleness

Inactive Publication Date: 2012-01-04
武汉吉和昌新材料股份有限公司
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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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  • Wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process
  • Wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process
  • Wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Process of the present invention is as follows:

[0015]

[0016] The concentration of the halogenated semicarbazide polymer is 250 g / L.

[0017] The brightener is prepared by the following method: take 100 milliliters of nicotinic acid with a concentration of 0.05 g / ml, 100 milliliters of ethylenetetraacetic acid disodium solution with a concentration of 0.10 g / mL, and 100 milliliters of triol-based polysulfone , 40 ml of sodium benzyl nicotinate and 200 ml of thiazolethione solution with a concentration of 0.01 g / mL are mixed together, added distilled water to 1000 ml, and stirred evenly.

Embodiment 2

[0019] Process of the present invention is as follows:

[0020]

[0021]

[0022] The concentration of the halogenated semicarbazide polymer is 200 g / L.

[0023] The brightener is prepared by the following method: take 125 milliliters of nicotinic acid with a concentration of 0.05 g / ml, 100 milliliters of ethylenetetraacetic acid disodium solution with a concentration of 0.10 g / mL, and 100 milliliters of triol-based polysulfone , 40 ml of sodium benzyl nicotinate and 180 ml of thiazolethione solution with a concentration of 0.01 g / mL are mixed together, added distilled water to 1000 ml, and stirred evenly.

Embodiment 3

[0025] Process of the present invention is as follows:

[0026]

[0027] The concentration of the halogenated semicarbazide polymer is 225 g / L.

[0028] The brightener is prepared by the following method: take 150 milliliters of nicotinic acid with a concentration of 0.05 g / ml, 80 milliliters of ethylenetetraacetic acid disodium solution with a concentration of 0.10 g / mL, and 120 milliliters of triol-based polysulfone , 56 ml of sodium benzyl nicotinate and 150 ml of thiazolethione solution with a concentration of 0.01 g / mL were mixed together, added distilled water to 1000 ml, and stirred evenly.

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PUM

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Abstract

The present invention relates to a zinc plating process method, specifically to a wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process. The process is as follow: 1 l of a zinc plating solution comprises of 8-12 g of ZnO, 120-140 g of NaOH, 15-20 ml of a brightener, 15-20 ml of a halogenated semicarbazide polymer; the cathode current density is 0.5-8.0A / dm<2>, the operating temperature is 5-45 DEG C. According to the present invention, the plating coat prepared through the process provided by the present invention has characteristics of brightness, uniformity, low brittleness, easy passivation; the operation is easy to be controlled; the amount of the brightener consuming is reduced so as to reduce cost and pollution.

Description

technical field [0001] The invention relates to a galvanizing process, in particular to a cyanide-free alkaline galvanizing process with wide temperature, wide current and wide brightness. Background technique [0002] After adding brighteners (monomers, intermediates and their mixed compounds) to the cyanide-free alkaline galvanizing, the brightness and smoothness of the coating surface are greatly improved from a macroscopic point of view, which can basically meet the requirements. General needs; but from a microscopic point of view, the grains of the coating texture are relatively rough and loose, and some have less obvious airflow scars or tumors, and the difference in the thickness of the deposited layer between the high and low current areas is also relatively large , There are even rough high areas and missing plating in low areas. Although these defects are related to the dispersibility of the brightener, which is often referred to as "positioning" by people in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22
Inventor 宋文超左正忠胡哲周自强
Owner 武汉吉和昌新材料股份有限公司
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