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Silane/rare-earth composite protective film on aluminum or aluminum alloy surface and preparation method thereof

A technology of aluminum alloy surface and rare earth compounding, applied in the coating process of metal materials, etc., can solve the problems of complex composition of treatment liquid and process, unsatisfactory protective performance of silane film self-healing ability, thin protective film layer, etc., and achieve surface structure Dense, simple process, and the effect of improving corrosion resistance

Inactive Publication Date: 2014-12-03
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patents and documents have problems such as complex composition of treatment liquid and complex process, thin protective film layer, unsatisfactory protective performance and silane film self-healing ability, etc.

Method used

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  • Silane/rare-earth composite protective film on aluminum or aluminum alloy surface and preparation method thereof
  • Silane/rare-earth composite protective film on aluminum or aluminum alloy surface and preparation method thereof
  • Silane/rare-earth composite protective film on aluminum or aluminum alloy surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of treatment solution A: Mix absolute ethanol and distilled water at a ratio of 5:95 to prepare an alcoholic aqueous solution, add 60ml of γ-APS to 940ml of alcoholic aqueous solution, adjust the pH value of the solution to 13 with ammonia water, stir and hydrolyze, and the hydrolysis temperature The temperature is 25°C, the hydrolysis time is 10h, and the solution becomes clear.

[0042] Preparation of treatment solution B: mix 1g sodium hydroxide, 60g CeCl 3 ·7H 2 O and 120ml of hydrogen peroxide solution with a mass concentration of 30% were sequentially added to 820ml of distilled water, mixed evenly, and the distilled water was increased to a volume of 1L, and the pH value of the solution was adjusted to 4 with glacial acetic acid, and placed in a constant temperature water bath at 30°C for later use.

[0043] After conventional pretreatment of 6063 aluminum alloy (sandpaper polishing→water washing→oil removal→water washing→removal of oxide layer→water...

Embodiment 2

[0046] Preparation of treatment solution A: Mix absolute ethanol and distilled water at a ratio of 10:90 to prepare an alcoholic aqueous solution, add 65ml of γ-APS to 935ml of alcoholic aqueous solution, adjust the pH value of the solution to 13 with ammonia water, stir and hydrolyze, and the hydrolysis temperature The temperature is 30°C, the hydrolysis time is 9.5h, and the solution becomes clear.

[0047] Preparation of treatment solution B: mix 3g sodium hydroxide, 70g CeCl 3 ·7H 2 O and 130ml of hydrogen peroxide solution with a mass concentration of 30% were sequentially added to 800ml of distilled water, mixed evenly, and the distilled water was increased to a volume of 1L, and the pH value of the solution was adjusted to 4.5 with glacial acetic acid, and placed in a constant temperature water bath at 35°C for later use.

[0048] After conventional pretreatment of 6063 aluminum alloy (sandpaper polishing→water washing→oil removal→water washing→removal of oxide layer→w...

Embodiment 3

[0051] Preparation of treatment solution A: Mix absolute ethanol and distilled water at a ratio of 15:85 to prepare an alcoholic aqueous solution, add 70ml of γ-APS to 930ml of alcoholic aqueous solution, adjust the pH value of the solution to 13 with ammonia water, stir and hydrolyze, and the hydrolysis temperature The temperature was 35°C, the hydrolysis time was 9h, and the solution became clear.

[0052] Preparation of treatment solution B: mix 5g sodium hydroxide, 80g CeCl 3 ·7H 2 O and 140ml of hydrogen peroxide solution with a mass concentration of 30% were sequentially added to 780ml of distilled water, mixed evenly, and the distilled water was increased to a volume of 1L, and the pH value of the solution was adjusted to 5 with glacial acetic acid, and placed in a constant temperature water bath at 40°C for later use.

[0053] After conventional pretreatment of 6063 aluminum alloy (sandpaper polishing→water washing→oil removal→water washing→removal of oxide layer→wate...

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Abstract

The invention discloses a silane / rare-earth composite protective film on an aluminum or aluminum alloy surface and a preparation method thereof. The preparation method comprises the following steps: sequentially immersing pretreated aluminum or aluminum alloy in a treatment fluid A and a treatment fluid B, and curing at 60-140 DEG C to obtain the composite protective film, wherein the treatment fluid A is prepared by mixing gamma-aminopropyltriethoxysilane, anhydrous alcohol and distilled water, regulating the pH value to 10-13 and finally hydrolyzing; and the treatment fluid B is prepared by mixing chlorinated rare earth salt, a hydrogen peroxide solution, sodium hydroxide and distilled water and regulating the pH value to 4-5. The treated silane / rare-earth composite protective film on an aluminum or aluminum alloy surface is uniform golden yellow on the surface, and has excellent corrosion resistance.

Description

1. Technical field [0001] The invention relates to a rare earth silane composite film on the surface of aluminum and aluminum alloy and a preparation method thereof. The preparation method is to form a silane film and a rare earth conversion film on the surface of aluminum and aluminum alloy, which have the characteristics of stability, high temperature resistance, high efficiency, and environmental protection. And it has a certain self-healing property, and its corrosion resistance is better than that of aluminum and aluminum alloy chromate passivation film, single silane film or single rare earth conversion film. [0002] The invention belongs to the technical field of metal surface corrosion protection. 2. Background technology [0003] The chemical properties of aluminum and aluminum alloys are active, and a layer of oxide film will be formed on the surface in the air. This film has poor protection ability in industrial atmosphere, sea water and various corrosive media, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/66C23C22/83
CPCC23C2222/20
Inventor 宣天鹏汪亮周赟张万利
Owner HEFEI UNIV OF TECH
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