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Preparation method for aluminium alloy surface ATS composite film compatible to FEVE fluorocarbon powder coating

An aluminum alloy surface, powder coating technology, applied to special surfaces, devices for coating liquids on surfaces, coatings, etc., can solve the problem of limiting VOC, incompatibility, boiling water adhesion, impact resistance, cupping resistance Salt spray does not meet the requirements and other problems

Active Publication Date: 2019-12-13
GUANGDONG PROVINCIAL ACAD OF BUILDING RES GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing organic-inorganic composite pretreatment membrane is completely incompatible with super weather-resistant fluorocarbon powder. Among the various indicators required by the national standard, boiling water adhesion, impact resistance, cupping resistance, and salt resistance Fog and other aspects are not up to the requirements, which greatly limits the industrial implementation of using fluorocarbon powder to replace fluorocarbon paint to solve the problem of VOC emissions

Method used

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  • Preparation method for aluminium alloy surface ATS composite film compatible to FEVE fluorocarbon powder coating
  • Preparation method for aluminium alloy surface ATS composite film compatible to FEVE fluorocarbon powder coating
  • Preparation method for aluminium alloy surface ATS composite film compatible to FEVE fluorocarbon powder coating

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preparation example Construction

[0027] A method for preparing an ATS composite film on the surface of an aluminum alloy compatible with FEVE fluorocarbon powder coatings, comprising the following steps: (1) Pretreating the aluminum alloy at room temperature by spraying and cleaning it for 3-15s with a degreaser to remove aluminum The surface of the alloy is oily, but the natural oxide film Al on the surface of the aluminum alloy is retained 2 o 3 (2) Coating the titanium dioxide passivation solution on the aluminum alloy surface after pretreatment, the coating time is 45-100s, and then naturally drying or drying to form TiO2 2 Conversion coating; (3) TiO 2The conversion coating is immersed in the silane modification solution for 3-8 minutes, and then dried and cured to form a silane gel layer protective film SiO 2 .

[0028] The preparation method of the ATS composite film on the surface of aluminum alloy compatible with FEVE fluorocarbon powder coating of the present invention, through the natural oxide ...

Embodiment 1

[0060] A kind of preparation method of the aluminum alloy surface ATS composite film compatible with FEVE fluorocarbon powder coating, comprises the following steps:

[0061] (1) Take a sample piece from a 6063 large-size aluminum alloy profile, spray and clean the aluminum alloy at room temperature for 3 seconds with a degreaser, and then dry it to remove the oil on the surface of the aluminum alloy, but retain the aluminum oxide protective film on the surface of the aluminum alloy;

[0062] (2) Coat the titanium dioxide passivation solution on the aluminum alloy surface after the pretreatment, and the coating time is 60s, then naturally dry or dry to form TiO2 2 conversion coating;

[0063] (3) TiO 2 The conversion coating was immersed in the silane modification solution for 3 minutes, and then dried and cured at 60°C for 2.5 hours to form a silane gel layer protective film.

[0064] In the present embodiment, the degreaser consists of 20 parts by weight of tetrasodium EDT...

Embodiment 2

[0068] A kind of preparation method of the aluminum alloy surface ATS composite film compatible with FEVE fluorocarbon powder coating, comprises the following steps:

[0069] (1) Take a sample piece from a 6063 large-size aluminum alloy profile, spray and clean the aluminum alloy with a degreasing agent at room temperature for 5 seconds, and then dry it to remove the oil on the surface of the aluminum alloy, but retain the aluminum oxide protective film on the surface of the aluminum alloy;

[0070] (2) Coat the titanium dioxide passivation solution on the aluminum alloy surface after the pretreatment, and the coating time is 100s, then naturally dry or dry to form TiO2 2 conversion coating;

[0071] (3) TiO 2 The conversion coating was soaked in the silane modification solution for 6 minutes, and then dried and cured at 100°C for 2 hours to form a silane gel layer protective film.

[0072] In the present embodiment, the degreasing agent consists of 10 parts by weight of tet...

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Abstract

The invention relates to the field of aluminium alloy surface protection, particularly to a preparation method for aluminium alloy surface ATS composite film compatible to an FEVE fluorocarbon powdercoating, which includes the following steps: adopting a degreaser for spraying cleaning for 3-15 s to aluminium alloy at the normal temperature, cleaning the surface grease dirt of aluminium alloy, yet retaining the surface natural oxidation film( Al2O3, 0.01-0.1 mum) of aluminium alloy; coating titanium dioxide passivating dip on the pretreated aluminium alloy surface, naturally airing or dryingto form a TiO2 conversion film (0.1-0.5 mum); soaking the TiO2 conversion film in the silane modifying solution, drying to form a silane gel layer protection film (SiO2, 0.5-2 mum). According to the invention, the aluminium oxide protection film, the TiO2 conversion film and the silane gel layer protection film realize the Al2O3-TiO2-SiO2 (ATS for short) triple protection on aluminium alloy material, the composite film is effectively compatible to the FEVE fluorocarbon powder coating coated on the surface of the protection film, has main propensities such as salt mist resistance, corrosion resistance, boiling water adhesive force all reaching the standard, and provides an effective solution for utilizing fluorocarbon powder to replace fluorocarbon paint and further reduce VOC emission.

Description

technical field [0001] The invention relates to the field of surface protection of aluminum alloys, in particular to an ATS composite film on the surface of aluminum alloys compatible with FEVE fluorocarbon powder coatings and a preparation method thereof. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing and chemical industry. However, the corrosion resistance of aluminum is weak, and anti-corrosion treatment on its surface is a necessary process. At present, most domestic enterprises choose the traditional hexavalent chromium passivation process from the perspective of technology maturity and cost saving, but hexavalent chromium is a highly toxic substance that seriously pollutes the environment. Hexavalent chromium migrates into the human body through water, soil, animals and plants, and has a strong carcinogenic effect. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D5/00B05D1/06C23C26/00C23C22/56
CPCB05D7/14B05D5/00B05D1/06C23C26/00C23C22/56
Inventor 张凯杨仕超马扬罗敏
Owner GUANGDONG PROVINCIAL ACAD OF BUILDING RES GRP CO LTD