Avaliação do potencial anticorrosivo de tiossemicarbazonas solubilizadas em microemulsão

Abstract

In this paper, thiosemicarbazones 4-N-cinnamoyl-thiosemicarbazone (CTSC), 4-N-(2'-methoxycinnamoyl)-thiosemicarbazone (MCTSC), and 4-N-(4'-hydroxy-3'- methoxybenzoyl)-thiosemicarbazone (HMBTSC) were solubilized in an oil-in-water (O/W) microemulsion system (ME-OCS), forming systems CTSC-ME-OCS, MCTSC-ME-OCS and HMBTSC-ME-OCS. The effectiveness of these systems in the process of inhibiting AISI 1020 carbon steel corrosion was evaluated in a saline solution (NaCl 0.5%), using a galvanostatic method. The tested thiosemicarbazones showed higher inhibitory effects (85.7% for CTSC-ME-OCS, 84.0% for MCTSC-ME-OCS, and 83.3% for HMBTSC-ME-OCS). The surfactant OCS (dissolved in H2O) and the ME-OCS system showed lower effcacies, with 71.0% for OCS and 74.0% for ME-OCS system.