Estudo eletroquímico de um derivado de oxazinoquinoxalina como inibidor de corrosão em aço carbono AISI 1018 em meio salino

• Autor(a) principal: Pereira, Joherbson Deivid dos Santos
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38248
• topic: Oxazinoquinoxalina.; Aço carbono.; Resistência à polarização linear (RPL).; Inibição à corrosão.; Corrosion inhibition.; Oxazinequinoxaline.; Mild steel.; Linear Polarization Resistance (LPR).; Química

Corrosion is a major problem affecting the industrial sector, carbon steel is the material most used for industrial applications, especially for the oil processing. The largest sources of oil are located in seas and oceans, and the metal corrosion occurs by the saline environment action. Some quinoxaline derivatives are reported in the literature as being effective agents in inhibiting corrosion. In this present study we evaluated the inhibitory capacity of the heterocyclic compound N-(2-hydroxyethyl)-2,3-dihydro[1,4]-oxazinoquinoxalina (OAQX) aiming at to protect the carbon steel corrosion AISI 1018, in saline medium (3.5% NaCl, 35,000 ppm). Studies of Linear Polarization Resistance (LPR) showed inhibition efficiencies ranging from 55.30% to 89.10% in low concentrations (6.0 ppm to 100.0 ppm), in which OAQX was solubilized in DMSO and diluted in 3.5% NaCl solution. Langmuir, Temkin and Frumkin isotherms were analyzed for determination of adsorption parameters. The derivative quinoxaline the oxazinoquinoxalina consisted of the first compound of this class, reported as a corrosion inhibitor, which differs from other heterocyclic compounds applied as anticorrosion due to its solubilization in neutral aqueous media which promotes the study of its interactions between metal-ligand.