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Cyanide-free cadmium-titanium plating alloy plating bath solution regeneration treatment method

A technology of electroplating bath solution and treatment method, which is applied in the direction of electrolysis process, electrolysis components, cells, etc., can solve the problems of large loss of bath solution, rough coating, difficulty in regeneration bath solution, etc., so as to increase production cost, reduce production cost, improve The effect of production efficiency

Active Publication Date: 2020-08-25
JIANGXI HONGDU AVIATION IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The electroplating process of cyanide-free cadmium-plated titanium alloy is easy to operate, the obtained coating has fine crystallization, good corrosion resistance, good hydrogen embrittlement resistance and no highly toxic cyanide in the plating solution, which has attracted more and more attention from domestic aviation companies, and Many companies have used it in production, but during the production process, milky white colloids are prone to appear in the bath, making the coating rough, black in appearance, low in titanium content, and hydrogen embrittlement performance that cannot meet aviation needs
[0003] If according to HB / Z 107-86 "High Strength Steel Parts Low Hydrogen Embrittlement Cadmium Plating-Titanium Process", the method of accelerating the coagulation of the sol by heating, and regenerating the sediment by filtering the sediment for a period of time will consume a lot of energy and the tank The liquid loss is large, and it is difficult to regenerate a large number of baths. In production, the method of scrapping is often used to reconstitute. As we all know, it is difficult to configure the cyanide-free cadmium-plated titanium bath, and the newly prepared cyanide-free cadmium-plated titanium bath needs a lot of time. Long-term aging, which will seriously affect the production progress and bring great pressure on the treatment of cadmium-containing wastewater in sewage stations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take 25 liters of invalid cyanide-free cadmium titanium alloy electroplating solution, the pH value is 6.5, the plating solution is turbid, when 2A / dm 2 When the current density is applied for plating, the appearance of the coating will be black, which cannot meet the production requirements.

[0040] According to the technical scheme of the present invention, the above-mentioned tank solution is regenerated, firstly add concentrated hydrochloric acid to adjust the pH value to 1.8, place it at low temperature for 48 hours, then adjust the pH value to 6.6 with concentrated ammonia water, the tank solution becomes clear, and quantitatively analyze the bath solution Each component, and add each component to the process range, wherein the content of titanium is 5g / L, the content of cadmium is 17.5 g / L, the content of EDTA is 35 g / L, and the content of NTA is 115 g / L.

[0041] Plating on A3 (75mm×25mm×2mm) steel, room temperature, current density 2A / dm 2 , The electroplat...

Embodiment 2

[0043] Take 25 liters of invalid cyanide-free cadmium titanium alloy electroplating solution, the pH value is 6.6, the plating solution is turbid, when 2A / dm 2 If the current density is low, the appearance of the coating will turn black, which cannot meet the production requirements.

[0044] According to the technical solution of the present invention, to regenerate the above bath, first add concentrated hydrochloric acid to adjust the pH to 2.0, place it at low temperature for 48 hours, then adjust the pH to 6.8 with concentrated ammonia, and the bath becomes clear. Quantitatively analyze the components of the bath solution, and add each component to the process range. The content of titanium is 5g / L, the content of cadmium is 17.5 g / L, the content of EDTA is 35 g / L, and the content of NTA is 115 g / L.

[0045] Plating on A3 (75mm×25mm×2mm) steel, room temperature, current density 2A / dm 2 , the time is 15 minutes, and the coating is rice yellow.

Embodiment 3

[0047] Take 25 liters of invalid cyanide-free cadmium titanium alloy electroplating solution, the pH value is 6.6, the plating solution is turbid, when 2A / dm 2 When the current density is applied for plating, the appearance of the coating will be black, which cannot meet the production requirements.

[0048] According to the technical solution of the present invention, to regenerate the above bath, first add concentrated hydrochloric acid to adjust the pH to 2.2, place it at low temperature for 48 hours, then adjust the pH to 6.7 with concentrated ammonia, and the bath becomes clear. Quantitatively analyze the components of the bath solution, and add each component to the process range. The content of titanium is 5g / L, the content of cadmium is 17.5 g / L, the content of EDTA is 35 g / L, and the content of NTA is 115 g / L.

[0049] Plating on A3 (75mm×25mm×2mm) steel, room temperature, current density 2A / dm 2 , the time is 15 minutes, and the coating is rice yellow.

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Abstract

The invention belongs to the technical field of surface treatment, and particularly discloses a cyanide-free cadmium-titanium plating alloy plating bath solution regeneration treatment method. The method comprises the following steps that concentrated hydrochloric acid is added into a invalid bath solution to dissolve a titanium hydroxide sol body; then concentrated ammonia water is added into thebath solution and dissolving is performed to separate out complexing agents EDTA and NTA; and finally the complexing agents EDTA and NTA and main salts cadmium and titanium are supplemented in to a regeneration bath solution, and electric treatment parameters are selected to enable a plating layer to be rice yellow. The method has the advantages that the method is simple, convenient and rapid, the production efficiency is improved, the stability and reliability of the bath solution and the quality of the plating layer are effectively improved, and a great significance is achieved for reutilization of the invalid bath solution.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a treatment method for regenerating a cyanide-free cadmium-titanium alloy electroplating bath solution. Background technique [0002] The electroplating process of cyanide-free cadmium-plated titanium alloy is easy to operate, the obtained coating has fine crystallization, good corrosion resistance, good hydrogen embrittlement resistance and no highly toxic cyanide in the plating solution, which has attracted more and more attention from domestic aviation companies, and Many companies have used it in production, but during the production process, milky white colloids are prone to appear in the bath solution, which makes the coating rough, black in appearance, low in titanium content, and the hydrogen embrittlement performance cannot meet the needs of aviation. [0003] If according to HB / Z 107-86 "High Strength Steel Parts Low Hydrogen Embrittlement Cadmium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D21/18C25D3/56
CPCC25D21/18C25D3/56
Inventor 李旭勇李琼彭东强蒋敏胡建冬吕晓雷魏娜李燕平廖可王云飞王锋马闪红
Owner JIANGXI HONGDU AVIATION IND GRP