Banca de DEFESA: JOHERBSON DEIVID DOS SANTOS PEREIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOHERBSON DEIVID DOS SANTOS PEREIRA
DATE: 31/03/2022
TIME: 14:30
LOCAL: Online
TITLE:

A DEFINIR

KEY WORDS:

A DEFINIR

PAGES: 89
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

Corrosion is a major problem affecting the industrial sector and carbon steel is the material most 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 the present study we evaluated the inhibitory capacity of a derivative oxazinoquinoxalina, N- (2-hydroxyethyl) -2,3-dihydro [1,4] -oxazinequinoxaline (OAQX), aiming carbon steel corrosion protection AISI 1018, in saline (3.5% NaCl). Studies of Resistance Polarization Linear (RPL) showed inhibition efficiencies ranging from 55% to 89% in low concentrations (6 pmm to 100.0 ppm) evaluated samples (OAQX) solubilized in DMSO. For determination of adsorption parameters, Langmuir isotherms were obtained, Temkin and Frumkin. The derivative quinoxaline the oxazinoquinoxalina consisted of the first compound of this class, reported as a corrosion inhibitor, which differs from other organic heterocyclic compounds applied as anticorrosion due to its solubilization in neutral aqueous media which promotes the study of its interactions with the metal-ligand. Due to the worsening of global environmental degradation, new practices have been adopted to control environmental impacts that consist of the development of clean technologies. In this perspective, colloidal systems based on coconut oil (OC) were evaluated as corrosion inhibitors in carbon steel AISI 1018, in saline medium (NaCl). The colloidal nano- and microemulsified OCS systems were evaluated by Linear Polarization Resistance (LPR) method. The maximum efficiencies were obtained in the range 70% to 84%. Aiming at to minimize environmental degradation, one of the systems (so called OC6, with 84% of corrosion inhibition) was used as carrier of the OAQX inhibitor, resulting in a more effective product, with maximum efficiency above 90%, representing a new anticorrosive product which consists in the development of clean technologies.

BANKING MEMBERS:
Externa à Instituição - AUREA ECHEVARRIA AZNAR NEVES LIMA - UFRRJ
Externa à Instituição - HERYKA MYRNA MAIA RAMALHO - UnP
Externo ao Programa - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Presidente - 373.201.654-49 - MARIA APARECIDA MEDEIROS MACIEL - UnP
Externo à Instituição - VALDIR FLORENCIO DA VEIGA JUNIOR - IME