Chromium-free composite passivator for hot-dip galvanized steel sheet and preparation and application methods of composite passivator

A technology of hot-dip galvanized steel sheet and passivation agent, applied in the direction of metal material coating process, etc., can solve the problems of less corrosion resistance than chromate passivation, unable to meet industrial requirements, zinc layer corrosion, etc., to achieve uniform appearance, The effect of low manufacturing cost and stable quality

Active Publication Date: 2014-12-03
唐山正元管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pH of the passivation solution is 6-9, and the passivation solution has good stability, but its corrosion resistance is not as good as that of chromate passivation, which cannot meet industrial requirements.
[0010] JP 10-219138A discloses a metal surface treatmen...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The raw material composition of the passivating agent is based on the total mass of 100g, including: 2.20g of water-based phenolic resin, 2.58g of fluozirconic acid (concentration is 46%), 0.08g of KH5500, 0.06g of zirconium sulfate, and 0.10g of zirconium oxychloride octahydrate , nitric acid (concentration is 68%) 0.09g, all the other are distilled water.

[0034] The preparation method of passivating agent: put 80g of distilled water in a beaker, add KH550, stir for about 25 minutes until KH550 is completely hydrolyzed; add fluozirconic acid under stirring; add nitric acid after fluozirconic acid is completely dissolved; measure the solution after nitric acid dissolves pH value; add zirconium sulfate under stirring state, and stir for 10 minutes; after the zirconium sulfate is completely dissolved, add zirconium oxychloride octahydrate, and stir until completely dissolved; after standing for 30 minutes, add water-based phenolic resin, and stir until the resin is compl...

Embodiment 2

[0038] The raw material composition of the passivator is based on the total mass of 100g, including: 2.23g of water-based phenolic resin, 2.60g of fluozirconic acid (concentration is 46%), 0.10g of KH5500, 0.07g of zirconium sulfate, and 0.11g of zirconium oxychloride octahydrate , nitric acid (concentration is 68%) 0.10g, all the other are distilled water.

[0039] The preparation method of passivating agent: put 80g of distilled water in a beaker, add KH550, stir for about 25 minutes until KH550 is completely hydrolyzed; add fluozirconic acid under stirring; add nitric acid after fluozirconic acid is completely dissolved; measure the solution after nitric acid dissolves pH value; add zirconium sulfate under stirring state, and stir for 10 minutes; after the zirconium sulfate is completely dissolved, add zirconium oxychloride octahydrate, and stir until completely dissolved; after standing for 30 minutes, add water-based phenolic resin, and stir until the resin is completely d...

Embodiment 3

[0043] The raw material composition of the passivator is based on the total mass of 100g, including: 2.26g of water-based phenolic resin, 2.62g of fluozirconic acid (concentration is 46%), 0.12g of KH5500, 0.08g of zirconium sulfate, and 0.12g of zirconium oxychloride octahydrate , nitric acid (concentration is 68%) 0.11g, all the other are distilled water.

[0044] The preparation method of passivating agent: put 80g of distilled water in a beaker, add KH550, stir for about 25 minutes until KH550 is completely hydrolyzed; add fluozirconic acid under stirring; add nitric acid after fluozirconic acid is completely dissolved; measure the solution after nitric acid dissolves pH value; add zirconium sulfate under stirring state, and stir for 10 minutes; after the zirconium sulfate is completely dissolved, add zirconium oxychloride octahydrate, and stir until completely dissolved; after standing for 30 minutes, add water-based phenolic resin, and stir until the resin is completely d...

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PUM

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Abstract

The invention relates to a chromium-free composite passivator for a hot-dip galvanized steel sheet. The passivator is prepared from the following raw materials in percentage by weight: 2.20-2.30% of water-base resin, 2.60-2.65% of main salt compound, 0.10-0.15% of organic silane, 0.07-0.09% of sulfate, 0.11-0.13% of inorganic zircon salt, 0.09-0.12% of inorganic acid and the balance of water. A preparation method of the passivator comprises the following steps: firstly, dissolving the organic silane in water; stirring till the organic silane is fully dissolved and adding the main salt compound; after the main salt compound is dissolved, adding the inorganic acid to measure the pH value; then, adding the sulfate and the inorganic zircon salt in the stirring state; after the sulfate and the inorganic zircon salt are fully dissolved, adding the water-base resin; stirring till the water-base resin is fully dissolved; adjusting the pH value to 3-4 by virtue of ammonium water; and standing for later use. An application method of the passivator comprises the following steps: firstly, degreasing the hot-dip galvanized steel sheet by virtue of an alkaline degreaser during use; then, respectively washing by using tap water and deionized water; and after drying, coating the composite passivator on the surface of the hot-dip galvanized steel sheet. The passivator provided by the invention is free from chromium and non-toxic and harmless. The thickness of a passivation film can reach 8-1.0mg/m<2>, and the corrosion resistance is close to that of a hexavalent chromium passivating liquid.

Description

technical field [0001] The invention relates to metal surface treatment, in particular to a chromium-free composite passivator containing zirconium salt for anticorrosion treatment on the surface of hot-dip galvanized steel sheets and a method for preparing and using the chromium-free composite passivator. Background technique [0002] Steel is the most widely used metal material in daily life, but the corrosion of steel brings huge losses. Galvanizing on the metal surface is an effective means to improve the corrosion resistance of steel plates. Hot-dip galvanized steel sheets have been widely used in different fields such as building materials, aviation, automobiles, and home appliances, and are one of the fastest-growing steel varieties in my country in recent years. [0003] For hot-dip galvanized steel sheets, under natural corrosion conditions, the anodic coating of the galvanized layer can not only cut off the atmosphere, but also the galvanized layer itself is prefe...

Claims

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Application Information

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IPC IPC(8): C23C22/34C23C22/36
Inventor 高波郝亚杰胡亮吕继可谢赟
Owner 唐山正元管业有限公司
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