Method for electrogalvanizing on surface of zinc alloy workpiece with blind holes

A workpiece surface, electro-galvanizing technology, applied in the field of electro-galvanizing, to achieve the effect of improving deep plating ability, complete coating and good bonding force

Active Publication Date: 2012-07-11
南通东湖国际商务服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in practical applications, the surface of zinc alloy die castings often contains blind holes with a depth of more than 30mm, and there is no good solution in the prior art

Method used

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  • Method for electrogalvanizing on surface of zinc alloy workpiece with blind holes

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Zinc alloy die-casting parts with different depths of blind holes were used as workpieces to be plated. The blind holes were circular holes with a diameter of 10 mm and depths of 30 mm, 40 mm, 50 mm and 60 mm, respectively.

[0034] The electroplating process is: degreasing, water washing, rust removal, water washing, electrogalvanizing, water washing, drying, and detecting whether a coating is formed on the inner wall of the blind hole. The composition of the electroplating solution is: ZnCl 2 65g / L; KCl 155g / L; H 3 BO 3 21g / L; Surfactant A0.28g / L, the balance is water. Solution temperature 25°C, cathode current density 2.5A / dm 2 , pH value = 5.5, electroplating time 60min. The resulting coating has good compactness, good gloss and good corrosion resistance. Plating is formed on all inner walls of blind holes with a depth of 30mm, 40mm, and 50mm, but no plating is formed on the bottom of a blind hole with a depth of 60mm

Embodiment 2

[0048] Zinc alloy die-casting parts with different depths of blind holes were used as workpieces to be plated. The blind holes were circular holes with a diameter of 10 mm and depths of 30 mm, 40 mm, 50 mm and 60 mm, respectively.

[0049] The electroplating process is: degreasing, water washing, rust removal, water washing, electrogalvanizing, water washing, drying, and detecting whether a coating is formed on the inner wall of the blind hole. The composition of the electroplating solution is: ZnCl 2 65g / L; KCl 155g / L; H 3 BO 3 21g / L; Surfactant A 0.28g / L; TX-10 0.15g / L, the balance is water. Solution temperature 25°C, cathode current density 2.5A / dm 2 , pH value = 5.5, electroplating time 60min. Plating layers are formed on all the inner walls of the blind holes with different depths, and the obtained plating layers have good compactness, good gloss and good corrosion resistance.

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Abstract

The invention discloses a method for electrogalvanizing on the surface of a zinc alloy workpiece with blind holes. The method has extremely good blind hole deep plating performance and can prevent corrosion of zinc alloy. An electrogalvanizing solution used in the invention comprises ZnCl2, KCl, H3BO3 and surfactant A, with the balance being water.

Description

technical field [0001] The invention relates to a method for electrogalvanizing, in particular to a method for electrogalvanizing the surface of a zinc alloy workpiece containing blind holes. Background technique [0002] Zinc alloy has been widely used because of its cheap price, low melting point, and especially its good die-casting performance. The appearance of zinc alloy die castings is gray and white, and there are various defects on the surface, such as: ash, shrinkage cavity, etc. Therefore, without surface treatment, its usability and decoration are very poor. A common surface treatment method is electroplating. [0003] However, in practical applications, some zinc alloy workpieces contain small-sized blind holes. And because the blind hole is small and deep, various electroplating solutions and sprays are not easy to enter, and the plating solution is difficult to clean after entering, so the surface treatment is difficult, and it takes a long time in the proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22C25D7/04
Inventor 张颖
Owner 南通东湖国际商务服务有限公司
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