Orbital - Vol. 15 No. 1 - January-March 2023
FULL PAPERS

Optimization of Hydrophobic Coating Production by Pechini Method on Modified Aluminum Surface

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  • Ariane Aparecida de Lima,
  • Lucas Aparecido Bittencourt,
  • Guilherme José Turcaltel Alves,
  • Gideã TRACTZ,
  • Paulo Rogério Pinto Rodrigues,
  • Cynthia Beatriz Fürstenberger
Ariane Aparecida de Lima
Universidade Federal do Paraná, Campus Politécnico
Lucas Aparecido Bittencourt
Universidade Federal do Paraná, Campus Politécnico
Guilherme José Turcaltel Alves
Instituto Federal do Paraná, Campus Cascavel
Gideã TRACTZ
Universidade Tecnológica Federal do Paraná, Campus Campo Mourão
Paulo Rogério Pinto Rodrigues
Universidade Estadual do Centro-Oeste, Campus Cedeteg
Cynthia Beatriz Fürstenberger
Universidade Estadual do Centro-Oeste, Campus Cedeteg
DOI: https://doi.org/10.17807/orbital.v15i1.17992
Published April 12, 2023
Keywords
  • Anodization,
  • Experimental Design,
  • Wetting,
  • Glycerin
How to Cite
(1)
de Lima, A. A.; Bittencourt, L. A.; Alves, G. J. T.; TRACTZ, G.; Rodrigues, P. R. P.; Fürstenberger , C. B. Optimization of Hydrophobic Coating Production by Pechini Method on Modified Aluminum Surface. Orbital: Electron. J. Chem. 2023, 15, 31-37.

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Abstract

To fabricate a hydrophobic coating using the sol-gel method (Pechini), an experimental design using the drying time and chemicals ratio as variables was developed. The coating was deposited on an aluminum substrate (AA6061-T6) treated by acid solution or anodization method. The surface wettability was measured using a goniometric instrument. Coatings were fabricated using different numbers of layers, heating rates, and drying temperatures, and their morphologies were observed using visual analysis and scanning electron microscopy. The use of anodization treatment with a furnace ramp of 1 °C min-1, a drying temperature of 220 °C ± 10 °C, and single-layer application, produced a coating free of visible flaws and apparent damage. The coating was obtained with a 15:1 glycerin:citric acid ratio and sample pre-polymerization in the drying oven for 1 hour at 100 °C resulted in the highest contact angle, 62° ± 2°, which meets the ASTM D-7334-08 standard for a hydrophobic surface.

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