ELECTROCHEMICAL AND MECHANICAL BEHAVIOR OF ALUMINUM AA2024-T3 COATED WITH HYBRID MATRIX CONTAINING GRAPHENE OXIDE
COMPORTAMENTO ELETROQUÍMICO E MECÂNICO DO ALUMÍNIO AA2024-T3 REVESTIDO COM FILME HÍBRIDO CONTENDO ÓXIDO DE GRAFENO
Henrique Ribeiro Piaggio Cardoso, Lilian Vanessa Rossa Beltrami, Patrícia Marcolin, Tatiane Longhi Scopel, Sandra Raquel Kunst, Lucas Madalosso de Lemos, Thuany Maraschin, Nara Regina de Souza Basso, Célia Fraga Malfatti
Abstract
The aeronautics industry uses aluminum alloy AA2024-T3 due to its low density and good mechanical properties. However, this alloy requires the use of protective coatings because it does not have the corrosion and wear resistance required by the aeronautics industry. In this context, this work aims at evaluating the performanceof AA2024-T3 aluminum coated with hybrid films containing graphene oxide. The hybrid films were obtained by a dip coating process from a sol composed by tetraethoxysilane/3 (trimethoxysilylpropyl) methacrylate/cerium nitrate/ethanol/water with different concentrations of graphene oxide in suspension. The morphology was evaluated by Scanning Electron Microscopy. The corrosion resistance and wear behavior of the obtained coatings were characterized by open circuit potential, polarization curves and dry wear tests using constant force in a ball-on-plate tribometer. In the studied conditions, the metal coated with hybrid matrix films containing graphene oxide presented no changes in the corrosion resistance, but it showed a positive contribution to the wear resistance.
Keywords
Resumo
A indústria aeronáutica utiliza a liga de alumínio AA2024-T3 devido a sua baixa densidade e boas propriedades mecânicas. Contudo, essa liga requer o uso de revestimentos protetores, pois não tem a resistência a corrosão e ao desgaste necessário para esta aplicação. Nesse contexto, este trabalho visa avaliar o desempenho da liga de alumínio AA2024-T3 revestida com filmes híbridos contendo óxido de grafeno. Os filmes híbridos são obtidos por processo de dip coating de um sol composto por tetraetoxisilano/3 (trimetoxisilylpropil) metacrilatonitrato de cério/etanol/água com diferentes concentrações de óxido de grafeno em suspensão. A morfologia foi avaliada por Microscopia Eletrônica de Varredura. O comportamento em relação a resistência à corrosão e ao desgaste dos revestimentos foi avaliada por potencial de circuito aberto, curvas de polarização e testes de desgaste a seco com força constante em um tribômetro ball-on-plate. Nas condições estudadas, o metal revestido com filmes híbridos contendo óxido de grafeno não apresentou mudanças na resistência a corrosão, mas mostrou uma contribuição positiva na resistência a abrasão.
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References
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