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A method for improving the appearance quality of cyanide-free electrogalvanized products

A technology of appearance quality and electro-galvanizing, which is applied in the field of improving the appearance quality of cyanide-free electro-galvanized products, and can solve problems affecting the final delivery of products

Active Publication Date: 2020-05-05
AVIC STANDARD PARTS MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the electro-galvanizing process is not adjusted and perfected, it will definitely affect the final delivery of our company's products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] (1) The electro-galvanized area of ​​a certain nut product is 30dm 2 , the current density is 1.5A / dm 2 For carbon steel parts, current = current density × plating area, the normal plating current is 45A; for the implementation of alkaline galvanizing, the flash plating current is twice the normal current, and the plating time is 3 minutes as an example. The steps are as follows:

[0015] 1. Parts are pre-treated according to requirements such as degreasing, derusting, cleaning, etc.;

[0016] 2. Put the pre-treated carbon steel parts into the electroplating tank for electrogalvanizing processing according to the electroplating process, the processing current is 45A, and the processing time is 40 minutes;

[0017] 3. Parts dehydrogenation and activation;

[0018] 4. Flash galvanizing, put the parts into the electroplating tank under the current of 90A, and the time is 3 minutes for rapid electroplating;

[0019] 5. Take out the product and carry out activation and pa...

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Abstract

The invention relates to the field of cyanide-free electroplating technologies, provides a corresponding solution mainly aiming at the problem of appearance discoloring of a product after hydrogen removal of a cyanide-free zinc electroplated product and particularly relates to a method for improving the appearance quality of a cyanide-free zinc electroplated product. After hydrogen removal is finished, a flash zinc plating technology is added, so that the appearance quality of the product after the flash zinc plating technology is implemented is superior to the appearance quality of the product processed by an original technology.

Description

technical field [0001] The field of the present invention is the field of cyanide-free electroplating technology. It mainly proposes corresponding solutions to the problem of discoloration of the appearance of cyanide-free galvanized products after dehydrogenation, and specifically relates to a method for improving the appearance quality of cyanide-free galvanized products. Background technique [0002] The cyanide-free electroplating galvanizing process has been studied in my country as early as the 1960s and 1970s. Alkaline zincate galvanizing, chloride galvanizing and other processes have appeared one after another. Due to many reasons, the appearance of the product after the hydrogen removal process is poor compared with the appearance of the cyanide-containing electroplating product, showing dark green, dark red and dark purple colors. In recent years, our company also encountered this problem in the application of cyanide-free electro-galvanizing process. Changes in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/36C25D5/00C25D5/48
CPCC25D5/00C25D5/36C25D5/48
Inventor 李云川刘洪萍尹军张丹徐春红陈文超
Owner AVIC STANDARD PARTS MFG