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Galvanized greenblack passivation solution and preparation method thereof

A passivation solution, dark green technology, applied in the coating process of metal materials, etc., can solve the problems of coating darkening, white corrosion, and the preparation method of galvanized dark green passivation solution that has not yet been seen, achieving soft luminosity, Good adhesion and bright colors

Active Publication Date: 2010-12-01
WEIFANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.
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  • Galvanized greenblack passivation solution and preparation method thereof
  • Galvanized greenblack passivation solution and preparation method thereof

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Embodiment 1

[0024] Embodiment 1, the component of every liter of passivation solution in the present embodiment is:

[0025] Chromic anhydride 20(g / L);

[0026] Phosphoric acid / (d=1.7) 11(ml / L);

[0027] Nitric acid / (d=1.4) 2.5(ml / L);

[0028] Sulfuric acid / (d=1.84) 2.5(ml / L);

[0029] Glacial acetic acid 4-5(ml / L);

[0030] Silver nitrate 0.008(g / L);

[0031] The balance is deionized water.

[0032] According to the amount of preparing 2000L passivation solution in this embodiment, its preparation method is as follows:

[0033] a. Pre-inject 1000L deionized water into the passivation tank with a volume of 3m3, then add the required amount of chromic anhydride according to the proportion of the above components, stir fully to dissolve it, and then add the required amount of phosphoric acid, nitric acid, Sulfuric acid, glacial acetic acid and silver nitrate, among which silver nitrate should be dissolved in deionized water in a beaker before adding to the passivation tank;

[0034] ...

Embodiment 2

[0039] Embodiment 2, the component of every liter of passivation solution of the present embodiment is:

[0040] Chromic anhydride 25(g / L);

[0041] Phosphoric acid / (d=1.7) 10(ml / L);

[0042] Nitric acid / (d=1.4) 2 (ml / L);

[0043] Sulfuric acid / (d=1.84) 2 (ml / L);

[0044] Glacial acetic acid 4-5(ml / L);

[0045] Silver nitrate 0.007(g / L);

[0046] The balance is deionized water.

[0047] Other technical features of this embodiment are the same as those of Embodiment 1.

Embodiment 3

[0048] Embodiment 3, the component of every liter of passivation solution in the present embodiment is:

[0049] Chromic anhydride 23(g / L);

[0050] Phosphoric acid / (d=1.7) 10(ml / L);

[0051] Nitric acid / (d=1.4) 2.2(ml / L);

[0052] Sulfuric acid / (d=1.84) 2.3(ml / L);

[0053] Glacial acetic acid 4-5(ml / L);

[0054] Silver nitrate 0.008(g / L);

[0055] The balance is deionized water.

[0056] Other technical features of this embodiment are the same as those of Embodiment 1.

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Abstract

The invention discloses a galvanized greenblack passivation solution and a preparation method thereof. The galvanized greenblack passivation solution mainly contains the following components: chromic anhydride, phosphoric acid, nitric acid, sulfuric acid, glacial acetic acid and silver nitrate. The preparation method of the galvanized greenblack passivation solution comprises the following steps of: previously infusing an appropriate amount of deionized water into a passivation groove; sequentially adding a certain amount of the chromic anhydride, the phosphoric acid, the nitric acid, the sulfuric acid, the glacial acetic acid and the silver nitrate; then complementally adding the deionized water to the passivation groove to reach a preset water level, and uniformly stirring. Passive film formed on a galvanized workpiece has the advantages of elegant and glossy appearance, gentle luminosity, green tone with black, good adhesive force, very high surface hydrophobicity and good corrosion resistance and is just like a paint layer and different from an army green passive film and a black passive film.

Description

technical field [0001] The invention belongs to the technical field of electroplating, in particular to a galvanized dark green passivation solution and a preparation method thereof. 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 layer becomes col...

Claims

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Application Information

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