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Behnaz Hamrahi,Ali Khanlarkhani,Seyed Morteza Madani,Arash Fattah‑alhosseini,Seyed Omid Gashti 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
In this work, the effect of Henna extract as an inhibitor on the corrosion behavior of API 5L Gr.B steel in H2S-containingsolution at 25 ˚C was investigated. The electrochemical impedance spectroscopy (EIS) and potentiodynamic polarizationtests were used for determination of corrosion parameters in the blank sample and samples with different concentrations ofthe extract. The obtained results indicated that with increasing Henna extract concentration, the corrosion current densitydecreased and the inhibition efficiency increased. The calculated efficiency of EIS and polarization tests showed good agreement. The studied inhibitor in this work follows the Langmuir adsorption isotherm and the type of surface adsorption isphysical. Quantum chemical parameters such as energy gap ( ΔE = EHOMO– ELUMO),lowest unoccupied molecular orbitalenergy (ELUMO), highest occupied molecular orbital energy (EHOMO), hardness ( ) and electronegativity ( inh ) for the mainconstituents of Henna extract were calculated. The results of quantum chemistry proved that the main constituent of Hennaextract and the inhibition agent was Lawsone.