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Processing technology of dark green passivating film of galvanized workpiece

A kind of processing technology, dark green technology, applied in the direction of metal material coating technology, etc., to achieve the effect of elegant appearance and good effect

Active Publication Date: 2012-08-08
WEIFANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zinc is a chemically active metal. If the workpiece is not post-treated after galvanizing, the coating will soon become dark and white corrosion will appear one after another.
At present, there is no relevant report on the processing technology of dark green passivation film on galvanized workpieces

Method used

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  • Processing technology of dark green passivating film of galvanized workpiece
  • Processing technology of dark green passivating film of galvanized workpiece
  • Processing technology of dark green passivating film of galvanized workpiece

Examples

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Embodiment 1

[0040] Embodiment 1, the processing technology of the dark green passivation film of the galvanized workpiece of the present embodiment is as follows:

[0041] ①Preparation of dark green passivation solution

[0042] According to the amount of 1 liter of solution, the components of the dark green passivation solution are:

[0043] Chromic anhydride 20(g / L);

[0044] Phosphoric acid / (d=1.7) 11(ml / L);

[0045] Nitric acid / (d=1.4) 2.5(ml / L);

[0046] Sulfuric acid / (d=1.84) 2.5(ml / L);

[0047] Glacial acetic acid 5(ml / L);

[0048] Silver nitrate 0.008(g / L);

[0049] The balance is deionized water. The preparation method is as follows: pre-inject an appropriate amount of deionized water into the passivation tank, add the required amount of chromic anhydride according to the proportion of the above components, stir fully to make it fully dissolved, and then add the required amount of phosphoric acid, nitric acid, Sulfuric acid, glacial acetic acid and silver nitrate, wherein th...

Embodiment 2

[0059] Embodiment 2, the component of every liter of dark green passivation solution of the present embodiment is:

[0060] Chromic anhydride 25(g / L);

[0061] Phosphoric acid / (d=1.7) 10(ml / L);

[0062] Nitric acid / (d=1.4) 2 (ml / L);

[0063] Sulfuric acid / (d=1.84) 2 (ml / L);

[0064] Glacial acetic acid 4(ml / L);

[0065] Silver nitrate 0.007(g / L);

[0066] The balance is deionized water. Other technical characteristics are the same as embodiment 1.

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Abstract

The invention discloses a processing technology of dark green passivating film of galvanized workpiece, which comprises the steps of: passivating a polished workpiece in dark green passivating solution, then cleaning, scalding and blow-drying or oven-drying the workpiece. The dark green passivating solution contains the components of chromic anhydride, phosphoric acid, nitric acid, sulfuric acid,glacial acetic acid and silver nitrate. The passivating film of the galvanized workpiece according to the processing technology has elegant and shiny appearance, soft luminosity and the color of black in green, which is just like a coat of paint, and in addition, the passivating film, different significantly from army-green passivating film and black passivating film, has good adhesion force, quite strong hydrophobicity on the surface thereof and excellent corrosive resistance.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and specifically relates to a processing technology for a dark green passivation film of a galvanized workpiece. Background technique [0002] Because the steel substrate is easy to rust, it is usually protected by electro-galvanizing in industry, that is, the steel substrate is protected by the sacrifice of zinc. However, zinc is a chemically active metal. If the workpiece is not post-treated after galvanizing, the coating will soon become dark and white corrosion will appear one after another. In order to avoid this phenomenon, a passivation solution is often used to passivate the galvanized layer of the workpiece, so that a passivation film is formed on the surface of the galvanized layer to improve its corrosion resistance. After the passivation film is formed, not only the corrosion resistance of the galvanized layer can be greatly improved, but also the appearance of the galvanized...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/78C23C22/33
Inventor 王宏曹玉宝
Owner WEIFANG UNIVERSITY
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