LAUSR

Using techniques such as in situ and ex situ Raman spectroscopy, cyclic voltammetry (CV), opencircuit potential (OCP) and electrochemical impedance spectroscopy (EIS), this work explored steel corrosion and its inhibition by Tagetes erecta (Marigold flower) in 3.5% NaCl solutions. As indicated by the electrochemical analysis, a reduced corrosion rate and corrosion current density as well as more positive corrosion potential values were obtained by adding and increasing the concentration of the Tagetes erecta extract (TEE). When the immersion time of an iron electrode in the test electrolyte was lengthened to 24 h, the abovementioned effect was strengthened. Using the Raman method, it was verified that iron corrosion was significantly inhibited by the obstruction of the iron active sites via the adsorption of TEE extract onto its surface when present in the chloride solution.