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Electroplating solution for surface of zinc alloy workpiece with blind hole

A workpiece surface and zinc alloy technology is applied in the field of electro-galvanizing solution on the surface of zinc alloy workpieces containing blind holes. Complete effect of coating

Active Publication Date: 2012-07-04
SHENZHEN CHENGGONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot achieve comprehensive galvanizing and corrosion inhibition on the inner wall of blind holes for deeper blind holes
[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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  • Electroplating solution for surface of zinc alloy workpiece with blind hole
  • Electroplating solution for surface of zinc alloy workpiece with blind hole
  • Electroplating solution for surface of zinc alloy workpiece with blind hole

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 45g / L; KCl 155g / L; H 3 BO 3 21g / L; Surfactant A 0.28g / L, the balance is water. Solution temperature 25°C, cathode current density 1A / 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 10mm and depths of 30mm, 40mm, 50mm, and 60mm, 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 45g / 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 1A / dm 2 , pH value = 5.5, electroplating time 60min. Coatings are formed on all inner walls of blind holes with different depths, and the obtained coatings have good compactness, good gloss and good corrosion resistance.

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Abstract

The invention discloses a zinc electroplating solution for the surface of a zinc alloy workpiece with a blind hole. The zinc electroplating solution has an excellent deep plating performance for the blind hole and can prevent zinc alloy from being corroded. The zinc electroplating solution comprises the following ingredients: ZnCl2, KCl, H3BO3, surface active agent A and water in balancing amount.

Description

technical field [0001] The invention relates to a solution for electrogalvanizing, in particular to a solution 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 pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22
Inventor 张颖
Owner SHENZHEN CHENGGONG CHEM
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