Environment-friendly passivation technology for hot-dip galvanized surface of steel

A hot-dip galvanizing and process technology, applied in hot-dip galvanizing process, metal material coating process, coating, etc., to achieve the effect of improving self-healing performance, excellent anti-corrosion performance, and simple preparation method

Inactive Publication Date: 2015-02-04
无锡永发电镀有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a surface passivation process for hot-dip galvanizing of steel products. The passivation solution used in the process has no trivalent chromium an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A steel hot-dip galvanized surface passivation process, the passivation solution used in the process consists of: disodium edetate 8-12g / L, cerium chloride 0.3-0.5g / L, lanthanum nitrate 0.2- 0.4g / L, boric acid 2.5-3.5g / L, 3-(2,3-epoxypropoxy)propyltrimethoxysilane 6-8g / L, ethylene glycol 14-18g / L, citric acid 10- 14g / L, γ-aminopropyltriethoxysilane 7-9g / L, and the balance is water; the passivation process is as follows: prepare a passivation solution with the above composition and put it in a passivation tank, Chemical solution: Dilute the passivation solution with water at a ratio of 1:3-5, and then make the pH value 3.5-4.5. After the steel is hot-dip galvanized, cool it with water, and then immediately put it into the passivation tank to passivate it. The time is 4-5 minutes.

Embodiment 2

[0013] A steel hot-dip galvanized surface passivation process, the passivation solution used in the process consists of: disodium edetate 8-12g / L, cerium chloride 0.3-0.5g / L, lanthanum nitrate 0.2- 0.4g / L, boric acid 2.5-3.5g / L, 3-(2,3-epoxypropoxy)propyltrimethoxysilane 6-8g / L, ethylene glycol 14-18g / L, citric acid 10- 14g / L, γ-aminopropyltriethoxysilane 7-9g / L, and the balance is water; the passivation process is as follows: prepare a passivation solution with the above composition and put it in a passivation tank, Chemical solution: Dilute the passivation solution with water at a ratio of 1:3-5, and then make the pH value 3.5-4.5. After the steel is hot-dip galvanized, cool it with water, and then immediately put it into the passivation tank to passivate it. The time is 4-5 minutes.

Embodiment 3

[0015] A steel hot-dip galvanized surface passivation process, the passivation solution used in the process consists of: disodium edetate 8-12g / L, cerium chloride 0.3-0.5g / L, lanthanum nitrate 0.2- 0.4g / L, boric acid 2.5-3.5g / L, 3-(2,3-epoxypropoxy)propyltrimethoxysilane 6-8g / L, ethylene glycol 14-18g / L, citric acid 10- 14g / L, γ-aminopropyltriethoxysilane 7-9g / L, and the balance is water; the passivation process is as follows: prepare a passivation solution with the above composition and put it in a passivation tank, Chemical solution: Dilute the passivation solution with water at a ratio of 1:3-5, and then make the pH value 3.5-4.5. After the steel is hot-dip galvanized, cool it with water, and then immediately put it into the passivation tank to passivate it. The time is 4-5 minutes.

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PUM

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Abstract

The invention discloses an environment-friendly passivation technology for the hot-dip galvanized surface of steel. A passivating solution employed by the technology comprises: 8-12 g/L of disodium ethylenediaminetetraacetate, 0.3-0.5 g/L of cerium chloride, 0.2-0.4 g/L of lanthanum nitrate, 2.5-3.5 g/L of boric acid, 6-8 g/L of 3-glycidoxypropyltrimethoxysilane, 14-18 g/L of glycol, 10-14g/L of citric acid, 7-9 g/L of gamma-aminopropyl triethoxysilane, and the balance water. The passivation technology comprises: putting the passivating solution with the above compositions into a passivation tank, diluting the passivating solution according to the passivating-solution to water ratio of 1:3-5, then enabling the pH value to be 3.5-4.5, after the steel is subjected to hot-dip galvanizing, cooling with water, then putting in a passivation tank at once, and passivating for 4-5 min.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a surface passivation process for hot-dip galvanizing of steel. Background technique [0002] Passivation treatment after galvanizing can not only improve the protective performance of the surface of the part, but also increase the surface decoration of the part. What usually use is chromate passivation. At present, the generally used chromic acid (hexavalent chromium) passivation solution (edited by Zeng Hualiang, etc., Electroplating Process Handbook, Machinery Industry Press, 1989), its typical components are : Chromic anhydride 5g / l, nitric acid 3ml / l, sulfuric acid 0.4ml / l. [0003] The advantages of chromate passivation are: on the one hand, the chromate passivation film is dense, corrosion-resistant, and has a strong bond with the base metal, which can isolate and protect the base metal in a corrosive environment; On the one hand, the chromate passivation film ...

Claims

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Application Information

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IPC IPC(8): C23C22/53C23C2/26C23C2/06
CPCC23C22/53C23C2/06C23C2/26
Inventor 石明
Owner 无锡永发电镀有限公司
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