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Chromium-free passivation solution for electro-galvanized steel plate and preparation method of passivation solution

A chromium-free passivation and electro-galvanizing technology, applied in the direction of metal material coating process, can solve the problem of not reaching the corrosion resistance of the passivation layer, achieve good corrosion resistance and oxidation resistance, and improve corrosion resistance. Effect

Active Publication Date: 2015-04-29
唐山京华制管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passivation layer of the passivation solution thus obtained has certain corrosion resistance, but still cannot reach the corrosion resistance of the passivation layer obtained by the passivation zinc coating of the traditional chromium-containing passivation solution, so it is not an ideal replacement product

Method used

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  • Chromium-free passivation solution for electro-galvanized steel plate and preparation method of passivation solution

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Effect test

Embodiment 1

[0023] A chromium-free passivation solution for electrogalvanized steel sheets, prepared from the following components in parts by mass: 8 parts of zinc vanadate, 6 parts of sodium molybdate, 8 parts of phosphoric acid, 3 parts of sodium bisulfite, and 5 parts of phytic acid 2 parts, 2 parts of diphenolic propane, 2 parts of sodium metasilicate, 3 parts of ethylene glycol and 15 parts of deionized water.

[0024] According to the preparation method provided by the invention, the above-mentioned chromium-free passivation solution for electro-galvanized steel sheets is prepared, and the preparation steps are as follows:

[0025] (1) Add vanadate and molybdate into deionized water, heat in a water bath at a temperature of 60°C, stir while adding, and mix well to obtain a mixed solution of vanadate and molybdate;

[0026] (2) Add phosphoric acid and phytic acid to the above mixed solution and stir evenly;

[0027] (3) Ultrasonically disperse sodium bisulfite and diphenolic propan...

Embodiment 2

[0030] A chromium-free passivation solution for electrogalvanized steel sheets, prepared from the following components in parts by mass: 20 parts of lithium vanadate, 12 parts of potassium molybdate, 15 parts of phosphoric acid, 8 parts of sodium bisulfite, and 12 parts of phytic acid Parts, 6 parts of diphenolic propane, 5 parts of sodium metasilicate, 8 parts of ethylene glycol and 22 parts of deionized water.

[0031] According to the preparation method provided by the invention, the above-mentioned chromium-free passivation solution for electro-galvanized steel sheets is prepared, and the preparation steps are as follows:

[0032] (1) Add vanadate and molybdate into deionized water, heat in a water bath at a temperature of 60°C, stir while adding, and mix well to obtain a mixed solution of vanadate and molybdate;

[0033] (2) Add phosphoric acid and phytic acid to the above mixed solution and stir evenly;

[0034] (3) Ultrasonically disperse sodium bisulfite and diphenoli...

Embodiment 3

[0037] A chromium-free passivation solution for electrogalvanized steel sheets, prepared from the following components in parts by mass: 11 parts of sodium orthovanadate, 8 parts of sodium molybdate, 10 parts of phosphoric acid, 4 parts of sodium bisulfite, phytic acid 7 parts, 3 parts of diphenolic propane, 4 parts of sodium metasilicate, 5 parts of ethylene glycol and 15 parts of deionized water.

[0038] According to the preparation method provided by the invention, the above-mentioned chromium-free passivation solution for electro-galvanized steel sheets is prepared, and the preparation steps are as follows:

[0039] (1) Add vanadate and molybdate into deionized water, heat in a water bath at a temperature of 60°C, stir while adding, and mix well to obtain a mixed solution of vanadate and molybdate;

[0040] (2) Add phosphoric acid and phytic acid to the above mixed solution and stir evenly;

[0041] (3) Ultrasonically disperse sodium bisulfite and diphenolic propane into...

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Abstract

The invention relates to a chromium-free passivation solution for an electro-galvanized steel plate and a preparation method of passivation solution and belongs to the technical field of metal surface treatment. The passivation solution is prepared from the following components in parts by mass: 8-20 parts of vanadate, 6-12 parts of molybdate, 8-15 parts of phosphoric acid, 3-8 parts of sodium bisulfite, 5-12 parts of phytic acid, 2-6 parts of diphenylolpropane, 2-5 parts of sodium metasilicate, 3-8 parts of ethanediol and 12-22 parts of deionized water. By the chromium-free passivation solution for the electro-galvanized steel plate, a stable complex passivation layer is formed on the surface of a galvanizing layer and has better corrosion resistance and oxidation resistance, especially corrosion resistance reaches the corrosion resistance of the passivation layer obtained by passivating the galvanizing layer through a conventional chromium-containing passivation solution and the chromium-free passivation solution is an ideal alternative product of the chromium-containing passivation solution.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, in particular to a chromium-free passivation solution for electrogalvanized steel sheets and a preparation method of the passivation solution. Background technique [0002] Passivation solution is a solution that can make the metal surface passive. It is generally used for post-plating treatment of zinc plating, cadmium plating and other coatings. The purpose is to form a surface state on the surface of the coating that can prevent the normal reaction of the metal and improve its resistance. Corrosion resistance, and increase product aesthetics. [0003] Galvanizing is a large variety in the electroplating industry and is widely used in the anticorrosion of steel. Since the galvanized layer is easily corroded and forms dark matter in the air, especially in a humid environment, passivation treatment must be carried out after the steel plate is galvanized. Passivation treatment af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 尤为
Owner 唐山京华制管有限公司
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