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Zinc coating passivation solution, preparation method and coating method thereof

A technology of passivation solution and zinc coating, which is applied in the coating process of metal materials, etc., can solve the problems of affecting product stability and increasing costs, and achieve the effects of prolonging the time of white rust, increasing stability and improving compactness

Active Publication Date: 2010-02-24
TIANJIN XZB SHERARDIZING METAL PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will affect the stability of the product and increase the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) 0.4g titanium trichloride (containing 0.13g of titanium ions); (2) 0.03g of fluorozirconic acid (containing 0.013 of zirconium ions); (3) 2.1g of hydrogen peroxide; (4) 9g of fluorosilicic acid; (5) 0.15 g of thiourea.

[0019] First, accurately weigh the above-mentioned components, add them to 500g deionized water successively under stirring, add deionized water until the total weight reaches 1000g, make a passivation solution after fully stirring, adjust the pH value of the passivation solution to 2.

[0020] Control the temperature of the passivation solution at 50°C, immerse the hot-dip galvanized steel plate in the solution for 1 minute, wash and dry, and the above operations can form a passivation layer with high corrosion resistance on the surface of the steel plate. The time for the first appearance of white rust in the neutral salt spray test of the passivation layer is 72 hours.

[0021] After the passivation solution was placed in a room at about 25°C f...

Embodiment 2

[0023] (1) 0.38g hexafluorotitanic acid (containing 0.111g of titanium ions); (2) 0.02g of zirconium tetrafluoride (containing 0.011g of zirconium ions); (3) 3.5g of ammonium persulfate; (4) 7.24g of fluoroboric acid ; (5) 0.16g alkylthiourea.

[0024] First, accurately weigh the above-mentioned components, add them to 500g deionized water successively under stirring, add deionized water until the total weight reaches 1000g, make a passivation solution after fully stirring, adjust the pH value of the passivation solution to 1.8.

[0025] Control the temperature of the passivation solution at 50°C, immerse the hot-dip galvanized steel plate in the solution for 1 minute, wash and dry, and the above operations can form a passivation layer on the surface of the steel plate. The time for the first appearance of white rust in the neutral salt spray test of the passivation layer is 96 hours.

[0026] After the passivation solution was placed in a room at about 25°C for 24 hours, th...

Embodiment 3

[0028] (1) 0.62g titanium trichloride (containing 0.192g titanium ion); (2) 0.03g zirconium tetrafluoride (containing 0.016g zirconium ion); (3) 2.3g hydrogen peroxide; (4) 6.2g fluoroboric acid ; (5) 1.15g fluosilicic acid; (6) 0.15g thiourea.

[0029] First, accurately weigh the above-mentioned components, add them to 500g deionized water successively under stirring, add deionized water until the total weight reaches 1000g, make a passivation solution after fully stirring, adjust the pH value of the passivation solution to 1.8.

[0030] Control the temperature of the passivation solution at 50°C, immerse the hot-dip galvanized steel plate in the solution for 1 minute, wash and dry, and the above operations can form a passivation layer on the surface of the steel plate. The time for the first appearance of white rust in the neutral salt spray test of the passivation layer is 120 hours.

[0031] After the passivation solution was placed in a room at about 25°C for a week, th...

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Abstract

The invention discloses a zinc coating passivation solution, a preparation method and a coating method thereof. The zinc coating passivation solution comprises the components by weight percent: 0.001-0.05% of metal ion, 0.01-0.4% of oxidant, 0.01-1% of corrosion inhibitor, 0-0.2% of thio-carbonyl compound and the rest of deionized water. After being prepared, the zinc coating passivation solutioncan be placed for 24h at the room temperature, and the properties of the solution can be maintained; compared with the prior art, the stability is greatly enhanced, and the zinc coating passivation solution has better corrosion resistance and abrasion resistance.

Description

technical field [0001] The present invention relates to a surface treatment method of zinc coating, more specifically to a zinc coating passivation solution and its preparation method and coating method, suitable for electro-galvanizing, hot-dip galvanizing, thermal spraying zinc and mechanical galvanizing, etc., especially Suitable for surface passivation treatment of hot-dip galvanizing. Background technique [0002] Galvanizing is an effective method to improve the atmospheric corrosion resistance of steel, but zinc is an active metal, which is prone to corrosion in humid atmosphere, forming white loose corrosion products, affecting the appearance of the product and shortening the service life. The most widely used method is to passivate it with chromate, but the hexavalent chromium in the product is a toxic substance. Therefore, an alternative to chromate passivation must be investigated. [0003] Invention patent CN200410021031.1 discloses a chrome-free passivation so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05C23C22/34
Inventor 程学群李晓刚董超芳骆鸿党建军
Owner TIANJIN XZB SHERARDIZING METAL PROD CO LTD
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