Tradescantia spathacea: New green corrosion inhibitor for SAE 1010 steel in acid medium

• J.R. Torres Hernández¹, E. Del Angel Meraz¹ and E.F. Corvo Perez²

¹ Juárez Autonomous University of Tabasco, Postgraduate in Engineering Sciences, Carretera Cunduacán-Jalpa Km. 1, Col. La Esmeralda, c.p. 86690, Cunduacán, Tabasco, México
² Autonomous University of Campeche, Corrosion Research Center, Corrosion Research Center, Av. Agustin Melgar S/Nentre calle 20 y Juan de la Barrera, Col Buenavista, c.p. 24039, Campeche, México

Abstract: Tradescantia spathacea extract (TSE) is a new green corrosion inhibitor of SAE 1010 steel in 1 M HCl. GC-MS, UV-VIS and FTIR analysis of the extract showed the presence of phenols and other heterocyclic compounds including the presence of O, N and S in the molecules, aromatic rings and different functional groups associated with inhibitory properties. Inhibitory efficiency was evaluated by Weight Loss, Tafel extrapolation and EIS. The range of maximum efficiencies was 91.31–95.16%, all determined at concentration 1200 ppm. They increase with immersion time. Tafel results indicate that it is a mixed-type inhibitor. Several adsorption models of Langmuir, Temkin and Freundlich were tested. The best fit corresponded to Langmuir. It means an adsorbed monolayer is formed without interactions between molecules. Electrochemical reactions different to those involved in corrosion may occur due to the presence of compounds in the extract that can be oxidized or reduced. That is the case of polyphenols oxidation already reported for Tradescantia Spathacea extracts. It is suggested to use non electrochemical methods like Weight Loss to confirm the efficiency of the inhibitor.

Keywords: acid medium, green corrosion inhibitor, steel, Tradescantia spathacea

Int. J. Corros. Scale Inhib., 2023, 12, no. 1, 61-83
doi: 10.17675/2305-6894-2023-12-1-4

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