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A highly stable cyanide-free alkaline zinc plating solution

A cyanide-free alkaline galvanizing technology with high stability, applied in the field of electroplating, can solve the problems of low stability and achieve the effects of improved stability, easy maintenance and strong adhesion

Active Publication Date: 2018-03-13
GUANGZHOU ULTRA UNION CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to propose a highly stable cyanide-free alkaline zinc-plating solution, which solves the problems of low stability of the current cyanide-free alkaline zinc-plating solution

Method used

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  • A highly stable cyanide-free alkaline zinc plating solution
  • A highly stable cyanide-free alkaline zinc plating solution
  • A highly stable cyanide-free alkaline zinc plating solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Hanging galvanizing process of the present invention is as follows:

[0018]

[0019]

[0020] The preparation method of the brightener is as follows: dissolve 30-50 g of sodium metabisulfite in 900 mL of water, and then add 20-50 g of 3-methoxy-4-hydroxybenzaldehyde or 3,4-dimethoxybenzaldehyde or 4-formaldehyde Oxybenzaldehyde, stir until the aldehyde compound is completely dissolved, and then add water to 1000mL.

[0021] The preparation method of the auxiliary agent is as follows: 50-150g of low-molecular-weight polyacrylamide, 20-50g of the reactant of imidazole and epichlorohydrin, 20-50g of pyridinium propane sulfobetaine or pyridinium hydroxypropyl sulfobetaine Add betaine to 750g of water, stir to dissolve, and then add water to 1000mL.

[0022] Hall cell test results:

[0023] Carry out 250mL Hall cell test, each test piece is plated with 1A current for 10min, add 0.15mL of brightener and 0.1mL of auxiliary agent for each plated 6 test pieces, add zinc...

Embodiment 2

[0031] Barrel galvanizing process of the present invention is as follows:

[0032]

[0033]

[0034] The preparation method of the brightener is as follows: dissolve 30-50 g of sodium metabisulfite in 900 mL of water, and then add 20-50 g of 3-methoxy-4-hydroxybenzaldehyde or 3,4-dimethoxybenzaldehyde or 4-formaldehyde Oxybenzaldehyde, stir until the aldehyde compound is completely dissolved, and then add water to 1000mL.

[0035] The preparation method of the auxiliary agent is as follows: 50-150 g of low molecular weight polyacrylamide, 20-50 g of the reactant of imidazole and epichlorohydrin, 20-50 g of pyridinium propane sultaine or pyridinium hydroxypropyl sultaine One of the alkalis, add 750g of water, stir to dissolve, and then add water to 1000mL.

[0036] According to this process, 80L of plating solution was prepared, and the actual barrel plating test was carried out for 20 hours. The performance of the plating solution remained good, and the coating test res...

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Abstract

The invention discloses a highly stable cyanide-free alkaline galvanizing solution, which is characterized in that it includes the following components: zinc ions 6 to 14 g / L; sodium hydroxide 90 to 150 g / L; brightener 0.5 to 1.5 mL / L; auxiliary agent 6~20mL / L. The highly stable cyanide-free alkaline galvanizing solution of the present invention improves the stability of the plating solution and the coating performance by re-selecting and combining the main brightener, auxiliary brightener and carrier brightener. The highly stable cyanide-free alkaline galvanizing solution provided by the invention is stable, easy to maintain, has high current efficiency and does not decrease with the extension of electroplating time, has less brittleness, greater adhesion and better corrosion resistance of the coating. high.

Description

technical field [0001] The invention relates to the field of electroplating, in particular to a highly stable cyanide-free alkaline zinc plating solution. Background technique [0002] The basic components of the cyanide-free alkaline zinc plating solution are zincate and sodium hydroxide, and an appropriate amount of brightener and auxiliary agent is added. The coating is suitable for various passivation treatments, and its corrosion resistance is higher than that of acid galvanizing and roughly the same as that of cyanide galvanizing. my country began to develop and use the cyanide-free alkaline galvanizing process in the 1970s. At the end of the 20th century and the beginning of the 21st century, it began to focus on improving and improving the performance of the cyanide-free alkaline galvanizing process. In the research literature on cyanide-free alkaline galvanizing additives, in 1994, a cyanide-free alkaline galvanizing brightener synthesized with organic amine and ep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/22
Inventor 赖奂汶郭崇武
Owner GUANGZHOU ULTRA UNION CHEM LTD
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