Chromium-free composite passivator and preparation method thereof

A passivation agent, cerium chloride technology, applied in the direction of metal material coating process, etc., can solve the problems of the film cannot be repaired, the corrosion resistance of the passivation film is decreased, and the corrosion resistance is not as good as that of the hexavalent chromium passivation, etc. The method is simple and easy to implement, reduces pollution, and breaks through the performance bottleneck.

Inactive Publication Date: 2011-08-31
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The corrosion resistance of early inorganic salts and organic chromium-free passivation is not as good as that of hexavalent chromium passivation. The passivation film formed by inorganic salt passivation is not as self-healing as the hexavalent chromium passivation film. In the case of film damage, The film cannot be repaired, resulting in a decrease in the corrosion resistance of the passivation film
Although the corrosion resistance of organic passivation is worse than that of inorganic salt passivation, there are defects in the film, and the corrosion resistance is not as good as hexavalent chromium passivation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Prepare silane solution: at room temperature, mix 25% ethanol, 4% water, and 4% γ-methacryloxytrimethoxysilane by mass percentage, and adjust the pH of the solution with acetic acid at 4. Close the prepared silane solution and place it for 2 days, so that the silane will undergo alcoholysis to generate SiOH active groups that are conducive to the formation of a passivation film;

[0029] (2) Prepare a mixed aqueous solution of sodium molybdate and cerium chloride: add 2.0% sodium molybdate, 3.0% cerium chloride, and 3.0% phosphoric acid into distilled water by mass percentage, stir for 10 minutes, and adjust the pH with acetic acid or ammonia water Value between 4;

[0030] (3) Pour the prepared mixed aqueous solution of sodium molybdate and cerium chloride into the silane solution, add 17% water-soluble epoxy resin and 13% water-soluble acrylic resin in sequence according to mass percentage, and stir for 30 minutes to make blunt The viscosity of the chemical solut...

Embodiment 2

[0033] (1) Prepare silane solution: at room temperature, mix 30% ethanol, 6% water, and 6% γ-methacryloxytrimethoxysilane by mass percentage, and adjust the pH value of the solution with acetic acid at 6. Close the prepared silane solution and place it for 3 days, so that the silane will undergo alcoholysis to generate SiOH active groups that are conducive to the formation of a passivation film;

[0034] (2) Prepare a mixed aqueous solution of sodium molybdate and cerium chloride: add 1.0% sodium molybdate, 2.0% cerium chloride, and 2.0% phosphoric acid into distilled water by mass percentage, stir for 10 minutes, and adjust the pH with acetic acid or ammonia water value in 6;

[0035] (3) Pour the prepared mixed aqueous solution of sodium molybdate and cerium chloride into the silane solution, add 16% water-soluble epoxy resin and 10% water-soluble acrylic resin in sequence according to mass percentage, and stir for 30 minutes to make blunt The viscosity of the chemical solu...

Embodiment 3

[0039] (1) Prepare the silane solution: at room temperature, mix 20% ethanol, 5% water, and 5% γ-methacryloxytrimethoxysilane by mass percentage, and adjust the pH of the solution with acetic acid at 5. Put the prepared silane solution in a sealed place for 2 days, so that the silane will undergo alcoholysis to generate SiOH active groups that are conducive to the formation of a passivation film;

[0040] (2) Prepare a mixed aqueous solution of sodium molybdate and cerium chloride: add 2.0% sodium molybdate, 3.0% cerium chloride, and 2.0% phosphoric acid into distilled water by mass percentage, stir for 10 minutes, and adjust the pH with acetic acid or ammonia water value in 5;

[0041] (3) Pour the prepared mixed aqueous solution of sodium molybdate and cerium chloride into the silane solution, add 15% water-soluble epoxy resin and 15% water-soluble acrylic resin in sequence according to mass percentage, and stir for 30 minutes to make blunt The viscosity of the chemical sol...

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PUM

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Abstract

The invention relates to the technical field of metal passivators, and particularly relates to a chromium-free composite passivator and a preparation method thereof. The chromium-free composite passivator provided by the invention is prepared from the following components in percentage by mass: 3.0-10% of gamma-methylacryloyloxytrimethoxy silane, 0.1-3.0% of sodium molybdate, 0.1-5.0% of cerium chloride, 0.5-4.0% of phosphoric acid, 0.5-4.0% of acetic acid, 15-20% of water-soluble epoxy resin, 5-15% of water-soluble acrylic resin, 10-30% of water and 20-40% of ethanol. The chromium-free composite passivator is suitable for treating steel, zinc and zinc alloy, or aluminum and aluminum alloy. The chromium-free composite passivator contains the water-soluble high-molecular resins and inorganic corrosion inhibitor, and is mixed with ethanol to form a colorless, innoxious, environment-friendly, transparent and clear solution. At room temperature, the chromium-free composite passivator is applied on the surface of steel, hot-galvanized zinc and zinc alloy, or aluminum and aluminum alloy to generate chemical crosslinking reaction, and is cured to form a film.

Description

technical field [0001] The invention relates to the technical field of metal passivators, in particular to a chromium-free composite passivator and a preparation method thereof. Background technique [0002] In recent decades, hexavalent chromate passivation has been used in our country. Hexavalent chromate passivation treatment significantly improves the corrosion resistance of hot-dip zinc and zinc alloys. The generated passivation film has self-healing effect and is low in price. , is widely used, but the chromate passivation solution contains hexavalent chromium, a highly toxic carcinogen, which seriously affects human health and pollutes the environment. At present, countries all over the world have begun to restrict or prohibit the use of chromate treatment methods, such as the EU's ROHS environmental protection regulations for hexavalent chromium-free products that were implemented in July 2006. Therefore, there is an urgent need to develop a non-toxic, environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42
Inventor 高波胡亮涂赣峰李世伟石为喜郝仪
Owner NORTHEASTERN UNIV
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