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Chromium-free passivator with high corrosion resistance for batch hot galvanizing

A chrome-free passivator, high corrosion resistance technology, applied in hot dipping process, metal material coating process, coating and other directions, can solve problems such as high carcinogenicity and high toxicity, and achieve enhanced affinity and good stability , the effect of fast drying

Pending Publication Date: 2021-08-24
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high toxicity and high carcinogenicity of Cr6+, it has been gradually banned by various countries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The raw materials of each component are taken in the following mass percentages: 1% of silica sol, 0.3% of phosphoric acid, 2% of complexing agent, 5% of silane coupling agent, and the balance is deionized water.

[0037] Concretely make chromium-free passivating agent according to the following steps:

[0038] S11. Accurately weigh the raw materials of each component in the chromium-free passivator according to the mass percentage of each component in the chromium-free passivator;

[0039] S12. Put the silica sol, complexing agent, nitric acid, and silane coupling agent weighed in the above S11 into the reaction kettle according to the proportion, and mix and stir to obtain a mixed solution A;

[0040] S13. Add the phosphoric acid weighed in the above S11 into the mixed solution A, and continue stirring to obtain the mixed solution B;

[0041] S14. Add deionized water to the above mixed solution B, and mix thoroughly to obtain a mixed solution C, and then concentrate ...

Embodiment 2

[0044] The raw materials of each component are taken in the following mass percentages: 2% of silica sol, 0.4% of phosphoric acid, 4% of complexing agent, 6% of silane coupling agent, and the balance is deionized water.

[0045] Concretely make chromium-free passivating agent according to the following steps:

[0046] S11. Accurately weigh the raw materials of each component in the chromium-free passivator according to the mass percentage of each component in the chromium-free passivator;

[0047] S12. Put the silica sol, complexing agent, nitric acid, and silane coupling agent weighed in the above S11 into the reaction kettle according to the proportion, and mix and stir to obtain a mixed solution A;

[0048]S13. Add the phosphoric acid weighed in the above S11 into the mixed solution A, and continue stirring to obtain the mixed solution B;

[0049] S14. Add deionized water to the above mixed solution B, and mix thoroughly to obtain a mixed solution C, and then concentrate a...

Embodiment 3

[0051] The raw materials of each component are taken in the following mass percentages: 3% of silica sol, 0.5% of phosphoric acid, 5% of complexing agent, 7% of silane coupling agent, and the balance is deionized water.

[0052] Concretely make chromium-free passivating agent according to the following steps:

[0053] S11. Accurately weigh the raw materials of each component in the chromium-free passivator according to the mass percentage of each component in the chromium-free passivator;

[0054] S12. Put the silica sol, complexing agent, nitric acid, and silane coupling agent weighed in the above S11 into the reaction kettle according to the proportion, and mix and stir to obtain a mixed solution A;

[0055] S13. Add the phosphoric acid weighed in the above S11 into the mixed solution A, and continue stirring to obtain the mixed solution B;

[0056] S14. Add deionized water to the above mixed solution B, and mix thoroughly to obtain a mixed solution C, and then concentrate ...

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PUM

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Abstract

The invention discloses a chromium-free passivator with high corrosion resistance for batch hot galvanizing. The chromium-free passivator is a mixed solution composed of silica sol, phosphoric acid, a complexing agent, nitric acid, a silane coupling agent and deionized water. The chromium-free passivator comprises the following components including, by mass, 1%-5% of silica sol, 0.3%-0.8% of phosphoric acid, 2%-8% of a complexing agent, 5%-10% of a silane coupling agent and the balance deionized water, wherein the complexing agent is one or a combination of more of dimercaptopropanol, sodium dimercaptopropane sulfonate, mercaptoethylamine, mercaptoacetic acid, thiourea, ammonium fluoride and 8-hydroxyquinoline. The invention also discloses a preparation method and a use method of the chromium-free passivator with the high corrosion resistance for batch hot galvanizing. The chromium-free passivator for hot galvanizing contains the silane coupling agent and silica sol, the silane coupling agent has the effect of enhancing the affinity between organic matter and inorganic compounds, toxic and harmful substances such as the chromium element and harmful chemicals are not contained, stability is good, the drying speed is high, and the passivating effect is good.

Description

technical field [0001] The invention relates to the field of chromium-free passivating agents, in particular to a chromium-free passivating agent for batch hot-dip galvanizing with high corrosion resistance. Background technique [0002] Galvanizing (including electro-galvanizing and hot-dip galvanizing) is one of the largest number of plating types in all metal surface deposition treatments, and is widely used in every field of the national economy, among which galvanized steel sheets are especially used in the automotive industry, electronic instruments, Support materials in various fields such as home appliances and construction industry. Due to the active chemical properties of the zinc layer itself, with the prolongation of the service time, it will gradually lose its protective effect on the substrate due to the corrosion of the environmental medium. Chemical passivation treatment of galvanized layer is the most common method to improve the corrosion resistance of gal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07C23C2/26
CPCC23C22/07C23C2/26
Inventor 尤为
Owner WUXI EPIC TECH
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