Avaliação do desempenho anticorrosivo do revestimento de polibenzoxazina sintetizada a partir do líquido da castanha de caju

• Ano de defesa: 2017
• Autor(a) principal: Lima, Daniele Rodrigues de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Ciência dos materiais; Resistência à corrosão; Revestimentos; Benzoxazinas; Corrosion; Coating; Benzoxazines
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/26079

The aim of this work was to evaluate the benzoxazine polymer, synthesized from the Cashew Nut Liquid (LCC) cardanol, as a coating for corrosion protection of AISI 1010 carbon steel. The physical properties of the synthesized polymer were characterized using Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) and degree of crosslinking based on ASTM D2765. Polymeric film was prepared by brushing the benzoxazine resin on the steel surface, followed by curing at 200 °C, and its adhesion to the steel surface was evaluated by the grid cutting method according to ABNT NBR 11003. Corrosion tests consisted of exposure to saturated moisture and saline fog, and immersion in 0.6 mol L-1 NaCl solution, with the monitoring of the degradation of the coating accompanied by monitoring the open circuit potential and electrochemical impedance spectroscopy. From the thermal characterization and analysis of the swelling of the cured polymer film, it was observed that the film cured at 200 °C for 2 h had properties applicable to the use as coating since it presented 98% crosslinking with excellent thermal stability and approximately 55 μm of thickness. In the electrochemical tests the presence of the plasticizer in the benzoxazine polymer matrix influenced the coating efficiency. When compared to the concentrations of 5% and 10% of the plasticizer in the electrochemical tests, the concentration of 10% of the plasticizer was more protective against corrosion compared to 5%. These results suggest that benzoxazines synthesized from cardanol from Cashew Nut Liquid (LCC) can be used as an alternative coating for corrosion protection on AISI 1010 carbon steel surfaces.