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Composite nanometer silane film for preventing corrosion on metal surface and film forming method thereof

A technology of metal surface and silane film, applied in the field of composite nano-silane film and its film formation

Inactive Publication Date: 2012-10-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been some studies on the surface pretreatment of galvanized steel with silane, there are few domestic reports on the use of γ-aminopropylmethyldiethoxysilane to improve the corrosion resistance of galvanized steel surface
However, on cold-rolled steel and galvanized steel, composite nano-γ-aminopropylmethyldiethoxysilane film is used instead of phosphating film for surface anti-corrosion treatment, which has not been reported at home and abroad so far.

Method used

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  • Composite nanometer silane film for preventing corrosion on metal surface and film forming method thereof
  • Composite nanometer silane film for preventing corrosion on metal surface and film forming method thereof
  • Composite nanometer silane film for preventing corrosion on metal surface and film forming method thereof

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Embodiment 1

[0034] Take 5ml of liquid γ-aminopropylmethyldiethoxysilane and add it to a mixed solution of 20ml of absolute ethanol and 175ml of deionized water, stir evenly, adjust the pH value to 11, and then add 50mg of activated nanomaterials, Stir to combine well. Hydrolyze at a constant temperature of 50°C for 20 hours to obtain a composite nano-silanol solution, which is ready for use. The processed cold-rolled steel substrate is immersed in the hydrolyzed silanol solution for 20 minutes, and dried in an oven at 120°C for 0.5 hour.

Embodiment 2

[0036] Take 10ml of liquid γ-aminopropylmethyldiethoxysilane and add it to a mixed solution of 10ml of absolute ethanol and 180ml of deionized water, stir evenly, adjust the pH to 12, then add 40mg of activated nanomaterials, and stir evenly Afterwards, it was hydrolyzed at a constant temperature of 40°C for 25 hours to obtain a composite nano-silanol solution, which was ready for use. Immerse the treated galvanized steel substrate in the hydrolyzed silanol solution for 30 minutes, and dry it in an oven at 90°C for 2 hours.

Embodiment 3

[0038] Take 2ml of liquid γ-aminopropylmethyldiethoxysilane and add it to a mixed solution of 15ml of absolute ethanol and 183ml of deionized water, stir evenly, adjust the pH value to about 9, then add 100mg of activated nanomaterials, stir After uniformity, it was hydrolyzed at a constant temperature of 30° C. for 30 hours to obtain a composite nano-silanol solution for use. Immerse the treated galvanized steel substrate in the hydrolyzed composite nano-silanol solution for 40 minutes, and dry it at room temperature of 25° C. for 20 hours.

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Abstract

Disclosed is a composite nanometer silane film for preventing corrosion on metal surfaces. The composite nanometer silane film is prepared by the steps of: adding Gamma- aminopropyl methyl diethoxysilane in ethanol-water solution with a volume percentage concentration of 1-40% and mixing to enable the volume percentage concentration of silane to reach 1-30%; adjusting the pH value to 8-13, adding activated nanometer materials SiO2 or / and Al2O3, stirring evenly and carrying out hydrolysis at a temperature of 10-70 DEG C to form silanol solution; and then immersing the treated metal in the silanol solution for a proper amount of time to generate a composite nanometer silane film on the surface of the metal, wherein 10-500 milligrams of activated nanometer material are added in every liter of silane hydrolysis solution. The composite nanometer silane film has excellent performance on corrosion preventing, and corrosion current is almost zero when the overpotential of an anodizing curve reaches 700mV in 3.5% NaCl solution.

Description

1. Technical field [0001] The invention relates to an anti-corrosion film on metal surfaces, in particular to a composite nano-silane film and a film-forming method for anti-corrosion on the surface of cold-rolled steel and galvanized steel. 2. Background technology [0002] Cold-rolled steel and galvanized steel have excellent mechanical properties, especially good processing properties, and are widely used in the manufacture of automobiles, home appliances, industrial equipment, and various engineering machinery. At present, the surface treatment of cold-rolled steel and galvanized steel is mostly chromate passivation or phosphating method, so that the surface has good corrosion resistance and better bonding force with the coating. However, the chromate passivation technology will produce harmful substances to the human body and the environment, and there are still some problems in the corrosion resistance and self-healing properties of the phosphating film. The treated wa...

Claims

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Application Information

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IPC IPC(8): C23C22/62
Inventor 鲁道荣周洋牛运峰
Owner HEFEI UNIV OF TECH