Green inhibition of copper corrosion by ammoides verticillata oil in 1M nitric acid: weight lossand Raman spectroscopic mapping studies

Abstract

The present study was designed to predict and analyze the effect of the essential oil of Ammoides verticillata (A.E.O) originating from the city of Souahlia (Tlemcen), which is located in northwest Algeria and its major compound on the inhibition of copper corrosion in 1 M HNO3. Gas chromatography coupled with mass spectrometry (GC-MS) revealed that carvacrol constitutes 67.89% of the essential oil. The study investigated the effect of concentration and temperature on copper corrosion and inhibitory efficiency using the gravimetric method. The findings indicate that A.E.O and carvacrol independently exhibit good inhibition properties on copper in 1 M HNO3, with the highest inhibitory efficiency at 1.5 g/L for A.E.O and 0.1 g/L for carvacrol, respectively. The adsorption of A.E.O and carvacrol on copper follows the Langmuir and Frumkin isotherm, respectively. The study also found competitive adsorption between iodide ions and A.E.O, as shown by the synergy parameter. Finally, Raman spectroscopy was used to analyze the immersed copper surface and mapping was used to characterize the surface layers in the different corrosive media used, which allowed us to develop a precise mapping of the corroded parts with the inhibited parts. This method will allow us to really see the inhibition effect of our materials.