Alumina Sol-Gel Film for Pretreatment to Paint on Aluminum Alloy

Qi Zhou; Ping Zhao; Chun Lin He; Qing Kui Cai

doi:10.4028/www.scientific.net/AMR.239-242.1678

Paper Titles

Microstructures of Co-Continuous SiC/Fe-2Cr13 Composite Fabricated by Vacuum-Pressure Casting and Infiltration Processes
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Preparation and Characterization of Aqueous Oil-Modified Polyurethane
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Study on the Lead-Free Easy-Cutting Mg-Sb Brass
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Synthesis, Properties and Application in Optical Memory of a Photochromic Diarylethene Bearing Chlorine Atoms
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Alumina Sol-Gel Film for Pretreatment to Paint on Aluminum Alloy
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Study on the Brush Plating Tecnology of Austenite Stainless Steel Parts
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An Efficient Visible Photocatalytic System Containing Eosin Y, Multiwalled Carbon Nanotubes and CuO for H₂ Evolution from Water
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Degradation of Rhodamine B in Wastewater Using Nanometer TiO₂ Film under UV Light Irradiation
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Research on Absorbing Properties of Nickel Plating Carbon Fiber-Resin Composites
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 239-242Alumina Sol-Gel Film for Pretreatment to Paint on...

Alumina Sol-Gel Film for Pretreatment to Paint on Aluminum Alloy

Abstract:

Aluminum alloy coatings for pretreatment are developed by sol-gel method. The adhesion between sol-gel film and the paint film was measured by scratching circles and corrosion resistance of sol-gel film was tested by salt spraying experiment. The adhesion between sol-gel film made by pure alumina sol and the paint film was so poor that it is unsuitable for ground coatings, but the composite sol which ultrafine Al₂O₃ powder was added to pure alumina sol can improve the adhesion and corrosion resistance. If the first layer film is made of pure alumina sol and the second layer is made of composite sol, the neutral salt spraying time of double layers film is longer than the single-layer composite sol-gel film. The adhesion for both double composite film and single-layer composite sol-gel film are first-grade. When solution of potessium dichromate is dropped on double combinatorial film for 100s, the solution will change in color. The gloss of paint film on double composite sol-gel film is 0.827, flexibility is 2×10mm and impact resistance is 1kg∙50cm. It is possible that composite sol-gel film or combinatorial sol-gel film replace dichromate salt conversion film on aluminum alloy using for painting pretreatment.