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Galvanization pretreatment method of zinc-based alloy

A pre-plating treatment and alloying technology, applied in the field of electroplating, can solve the problems of high wastewater treatment costs, prohibition of using anti-staining salt, strong acidity of industrial wastewater, etc., and achieve good results and reduce emissions

Inactive Publication Date: 2018-02-13
清远鑫河五金科技有限公司
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  • Summary
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Problems solved by technology

However, the headaches for all enterprises are the water consumption caused by the carbonization of concentrated sulfuric acid, the industrial wastewater discharged is extremely acidic, and the wastewater treatment costs are high.
The problem of chromaticity treatment of anti-staining salt wastewater is extremely difficult to solve, so the industrial policy clearly stipulates that the use of anti-staining salt is not allowed

Method used

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  • Galvanization pretreatment method of zinc-based alloy

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Embodiment Construction

[0013] Such as figure 1 Shown, the present invention discloses a kind of electroplating pretreatment method of zinc-based alloy, comprises the following steps:

[0014] S1: Use ultrasonic waves to remove wax and oil from zinc-based alloy workpieces;

[0015] S2: Put the workpiece into two hot water pools and wash it twice with hot water to prevent the wax removal water on the workpiece from drying out to form an oxide film, resulting in oil on the workpiece after electroplating;

[0016] S3: Wash twice with clean water to strengthen the cleaning of the workpiece, which is cleaned twice through the secondary water tank;

[0017] S4: Use a release agent to remove wax, instead of concentrated sulfuric acid, to treat the wax mold on the surface of the workpiece;

[0018] S5: Wash three times with clean water to further strengthen the cleaning of the workpiece to prevent the acid in the release agent from being brought into the alkaline degreasing tank, which is cleaned three tim...

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Abstract

The invention provides a galvanization pretreatment method of zinc-based alloy. The method is characterized by comprising the following steps: S1: performing wax removal and oil removal treatment on azinc-based alloy workpiece by using ultrasound wave; S2: washing two times by using hot water; S3: washing two times by using clear water; S4: removing the wax by using a release agent: S5: washing three times by using the clear water; S6: performing electrolytic degreasing by lye; S7: washing three times by using the clear water: S8: bleaching by using the release agent; S9: washing three timesby using the clear water; S10: performing cyanogen electrolysis; S11: plating alkali copper. The ultrasound wave is used for performing wax removal and oil removal on the zinc-based alloy workpiece, the effect is better, by replacing concentrated sulfuric acid with the release agent in order to remove the wax, not only is the effect good but also the discharge of industrial wastewater is reduced,the reserve salt is further replaced with the release agent, the discharge of industrial pollution is further reduced, and the pretreatment method is more environmentally friendly.

Description

technical field [0001] The invention relates to the field of electroplating, in particular to a pretreatment method for zinc-based alloy electroplating. Background technique [0002] Metal zinc has strong chemical activity and is an amphoteric reactant, which reacts with both acid and alkali. The price of zinc-based alloy is lower than that of copper and stainless steel, and it is easy to manufacture and polish, so it occupies a considerable proportion in the electroplating substrate. [0003] Due to the strong chemical activity of zinc-based alloys, strong chemical dewaxing, degreasing and electrolytic degreasing processes cannot be used for pretreatment. In traditional processes, chemical methods with weak alkalinity are used to treat the film quality and oil quality on the surface of the base metal. . Although chemical raw material suppliers have continuously developed wax and degreasing electric protection degreasing agents suitable for zinc-based alloys in recent year...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/34C23G1/10
CPCC25D5/34C23G1/10
Inventor 何勇何琦何亮
Owner 清远鑫河五金科技有限公司
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