Thin films produced on 5052 aluminum alloy by plasma electrolytic oxydation with Red Mud-containing Electrolytes

• Autor(a) principal: Sottovia,Lívia
• Data de Publicação: 2014
• Outros Autores: Antunes,Maria Lúcia Pereira, Antonio,César Augusto, Rangel,Elidiane Cipriano, Cruz,Nilson Cristino da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Materials research (São Carlos. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000600007
• topic: plasma electrolytic oxidation; ceramic coatings; red mud

In this paper, we propose the production of ceramic protective thin films by plasma electrolytic oxidation using red mud-containing electrolytes. The treatments were performed through the application of pulsed voltage (600 V, 200 Hz) during 300 seconds to aluminum samples immersed in electrolytic solutions with 5 g of red mud per liter of distilled water. The coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS) and contact angle and surface energy measurements. The final current density during the experiments was 0.05 A/cm² and films as thick as 9.0 µm have been obtained. XRD patterns have clearly shown the incorporation of species from the red mud on the coating.