Method for compounding nano ceramic silane composite film before spraying aluminum product

A silane composite film, nano-ceramic technology, applied in the direction of metal material coating process, can solve the problems of coating peeling, affecting the adhesion of aluminum materials, etc., and achieve the effect of improving adhesion

Inactive Publication Date: 2011-08-31
佛山市南海华豪铝型材有限公司
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Problems solved by technology

[0003] Because the traditional chromizing bath process contains fluoride ions, aluminum fluoride will be produced on the surface of the aluminum workpiece during the processing of the aluminum material. Aluminum fluoride is insolubl

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  • Method for compounding nano ceramic silane composite film before spraying aluminum product
  • Method for compounding nano ceramic silane composite film before spraying aluminum product

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with embodiment:

[0036] A method for composite nano-ceramic silane composite film before aluminum material spraying comprises the following steps:

[0037] 1. Acid degreasing: immerse the aluminum material in a sulfuric acid tank, in which the free acid content is 130g-200g / L, the temperature is normal temperature, and the time is 1min-3min;

[0038] 2. Water washing: immerse the degreased aluminum material in water, the water should keep overflowing, the pH value is ≥ 2, the temperature is normal temperature, and the time is 1min to 2min;

[0039] 3. Alkali etching: immerse the aluminum material in the lye tank, in which the free alkali content is 40-60g / L, the temperature is normal temperature, the time is 1min-3min, and the amount of alkali etching is at least 1.5g / m 2 above;

[0040] 4. Water washing: immerse the aluminum material after alkali etching in water, the water should keep overflowing...

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Abstract

The invention discloses a method for compounding a nano ceramic silane composite film before spraying an aluminum product. The composite film uses a sol-gel technology, is treated by a nano SiO2 silane treatment fluid and dewatered to form a three-dimensional network structure on the basis of an Si-O-Si bond, and is compounded with the surface of the aluminum product on the basis of an Si-O-Al covalent bond. Since the nano ceramic silane composite film is subjected to chromium-free treatment, the invention solves the problem of chromium pollution in aluminum product industry. No substance affecting the film formation is generated in the surface treatment process and attached to the surface of the aluminum product, so the aluminum product does not need to be washed with water before spraying. The added nano filler is dispersed in the network-structure film layer, and can form a bridge bond on the surface of the aluminum product after being compounded with hydrolyzed silane, so that the film is tightly combined with the aluminum product without any crack; and the film is compounded with the aluminum product in a combination mode of chemical covalent bond, thereby obviously increasing the adhesive force of the coating.

Description

technical field [0001] The invention relates to the technical field of aluminum material surface treatment, in particular to an aluminum material compounded with a composite film before the aluminum material is sprayed. Background technique [0002] At present, aluminum materials are generally treated with chromate to form a chromized layer before spraying, and the chromated waste contains a large amount of harmful components such as hexavalent chromium ions. Because of these hexavalent chromium and its loss and diffusion, it constitutes a pollution hazard to the ecological environment. The second is the strong alkali hazard of chromium slag. When chromium slag is piled up in the open air, a large amount of hexavalent chromium ions will be dissolved, lost, and infiltrated into the ground surface after long-term rainwater washing, thereby polluting groundwater, rivers, and lakes, and endangering farmland, aquatic products, and human health. Hexavalent chromium ions are very...

Claims

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Application Information

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IPC IPC(8): C23C22/02
Inventor 叶泽恩
Owner 佛山市南海华豪铝型材有限公司
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