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Chromium-free passivating liquid for surface treatment of electrogalvanized steel plate and use method thereof

A chromium-free passivation and surface treatment technology, applied in the coating process of metal materials, etc., to achieve good coating performance, good protection performance, and reduced corrosion resistance

Inactive Publication Date: 2008-10-22
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of immersing the galvanized layer in rare earth salt solution is less researched, and the corrosion resistance of the rare earth salt conversion coating on the galvanized sheet is slightly higher than that of the chromate passivation film under certain conditions.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] Embodiment of the present invention sees table 1:

[0035] Table 1 Unit: mass percentage

[0036]

[0037] The method for using the passivation solution implemented by the present invention is: electrogalvanizing 20g / m of steel plate 2 After that, rinse it with tap water immediately, and dry it with cold wind; then apply the passivation solution evenly on the surface of the electro-galvanized steel sheet by roller coating; bake for 5 minutes at 200°C; cool naturally; the obtained passivation Film thickness is 0.2~2.0g / m 2 .

[0038] The performance data in the implementation of the present invention is as shown in table 2 below, wherein 7 grades of 24 hours salt spray test are to meet the standard:

[0039] Table 2

[0040] spray time

[0041] 72

[0042] It can be seen from the above table that the salt spray test time of the galvanized sheet in the present invention is very ideal.

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PUM

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Abstract

The invention discloses a chromium-free passivating solution for the surface treatment of electro-galvanized steel plates, as well as a method for using the same. The mass percentages of the composition of the chromium-free passivating solution are: 0.2-20 percent of gamma-glycidyl ether oxygen propyl trimethoxy silane, 0.01-1.0 percent of polyvinyl alcohol, 0.1-3.0 percent of ammonium zirconium carbonate, water as a solvent, and the balance. The application method comprises the following steps that: the surface of a clean electro-galvanized steel plate is coated with the passivating solution, and then the passivating solution is baked to become a film; the thickness of a film layer is between 0.2 and 2.0 g / m<2>. The process treatment of the invention remarkably improves the corrosion resistance of the electro-galvanized steel plate, which is equivalent to chromate color passivation. In addition, through the treatment of the process, the coating performance of the electro-galvanized steel plate is remarkably improved as well.

Description

technical field [0001] The invention relates to a passivation process for electrogalvanized steel sheets, in particular to a chromium-free passivation solution for surface treatment of electrogalvanized steel sheets and a method for using the same. Background technique [0002] Electro-galvanizing is an effective method to improve the corrosion resistance of steel plates, but in a humid environment, the galvanized layer is prone to corrosion, forming white loose corrosion products on the surface of the coating, and turning the bright white coating into dull and dull, affecting the appearance. At present, the most widely used method to improve the corrosion resistance of zinc coating is hexavalent chromium passivation, that is, chromate passivation. This passivation method has simple process, low cost and good corrosion resistance. [0003] As we all know, hexavalent chromium is a substance that seriously pollutes the environment. Long-term exposure will lead to chromium ulce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05
CPCC23C2222/20
Inventor 孙宁锋李宁吴志良黄兴桥倪富荣邹美平姚勇黎德育
Owner BAOSHAN IRON & STEEL CO LTD
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