<i>Ruta graveolens</i> Plant Extract as a Green Corrosion Inhibitor for 304 SS in 1 M HCl: Experimental and Theoretical Studies
Sonia Estefanía Hernández-Sánchez,
Juan Pablo Flores-De los Rios,
Humberto Alejandro Monreal-Romero,
Norma Rosario Flores-Holguin,
Luz María Rodríguez-Valdez,
Mario Sánchez-Carrillo,
Anabel D. Delgado,
Jose G. Chacón-Nava
Affiliations
Sonia Estefanía Hernández-Sánchez
Department of Mellurgy and Structural Integrity, Advanced Materials Research Center (CIMAV), Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31136, Chih., Mexico
Juan Pablo Flores-De los Rios
Department Metal-Mechanical, Tecnológico Nacional de México-Instituto Tecnológico de Chihuahua, Av. Tecnológico 2909, Chihuahua 31130, Chih., Mexico
Humberto Alejandro Monreal-Romero
Department of Biomaterials Science and Nanotechnology, University of Chihuahua (UACH), Chihuahua 31000, Chih., Mexico
Norma Rosario Flores-Holguin
NANOCOSMOS Virtual Laboratory, Department of Environment and Energy, Advanced Materials Research Center (CIMAV), Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31136, Chih., Mexico
Luz María Rodríguez-Valdez
Faculty of Chemical Sciences, Autonomous University of Chihuahua (UACH), Chihuahua 31125, Chih., Mexico
Mario Sánchez-Carrillo
Department Metal-Mechanical, Tecnológico Nacional de México-Instituto Tecnológico de Chihuahua, Av. Tecnológico 2909, Chihuahua 31130, Chih., Mexico
Anabel D. Delgado
Department of Engineering and Materials Chemistry, Advanced Materials Research Center (CIMAV), Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31136, Chih., Mexico
Jose G. Chacón-Nava
Department of Mellurgy and Structural Integrity, Advanced Materials Research Center (CIMAV), Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31136, Chih., Mexico
This study evaluated the corrosion inhibitory effects of Ruta graveolens leaf extract for 304 stainless steel in 1 M HCl. The analysis of the leaf extract using HPLC indicated that the primary compounds present in the leaf extract were rutin, caffeic acid, p-coumaric acid, and apigenin. The inhibition efficiency (IE%) of the extract was studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and computational simulation (density functional theory, DFT). The effects of the inhibitor concentration and solution temperature were investigated. The results indicated that the IE% increased for increasing concentrations of the extract, while the reverse was true with increasing temperatures. At 25 °C and a 600 ppm extract concentration, the results indicated a maximum inhibition efficiency of 95%, 98%, and 96% by weight loss, potentiodynamic polarization, and EIS techniques, respectively. SEM observations showed a significant change in the surface morphology of the 304 SS with and without the addition of the inhibitor compound. At all temperatures, the adsorption of the inhibitor components onto the 304 SS surface was found to follow the Langmuir isotherm model, and the inhibition process was governed by physical adsorption. Furthermore, chemical interactions between the inhibitor and the 304 SS steel surface were elucidated via density functional theory (DFT) calculations.
