Caracterização estrutural e eletroquímica de recobrimentos a base de óxido de grafeno aplicados sobre liga de NiTi superelástica

• Ano de defesa: 2021
• Autor(a) principal: Athos Fernandes Araujo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; Brasil; ENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA; Programa de Pós-Graduação em Engenharia Metalúrgica, Materiais e de Minas; UFMG
• Palavras-chave em Português: Níquel-titânio; Corrosão; Revestimento por imersão; Revestimento à base de grafeno; Biomateriais; Engenharia metalúrgica; Metalurgia física; Aço - Corrosão; Ligas de níquel-titânio; Materiais biomédicos; Revestimentos
• Link de acesso: http://hdl.handle.net/1843/38792

The mechanical responses under superelastic loading cycles, and the corrosion protection capacity of two graphene-based coatings applied to a NiTi alloy were evaluated. Graphene oxide (GO) and a composite of reduced graphene oxide (RGO) incorporated in a block copolymer of styrene-ethylene-butylene-styrene (SEBS) were deposited on the substrate via dip-coating. The morphology of the coatings was characterized by scanning electron microscopy before and after uniaxial loading cycles up to 6%. Atomic force microscopy was also used to evaluate the roughness of the coatings. The corrosion behavior was studied by potentiodynamic polarization, electrochemical impedance spectroscopy, and Mott-Schottky analysis. The results showed that both GO and RGO+SEBS coatings presented the capacity of following several superelastic cycles and maintain their morphological integrity. However, only the RGO+SEBS coating showed a significant improvement in terms of corrosion resistance.