Bark resin of Schinus molleSchinus molle as an eco‐friendly inhibitor for API 5L X70 pipeline steel in HCl medium

摘要

> The inhibition effect of bark resin of Schinus molle (BRSM) on the corrosion of API 5L X70 pipeline steel in hydrochloric acid solution has been studied for the first time by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements; also, surface morphology has been analyzed by SEM‐EDX. The inhibitor (BRSM) has been characterized by Fourier transform infrared spectroscopy (FTIR). The results show that BRSM is a good inhibitor in hydrochloric acid solution. The maximum percentage inhibition efficiency is equal to 94% at 2?gL ?1 . The adsorption of BRSM on API 5L X70 pipeline steel surface obeys Langmuir adsorption isotherm, and involves physical adsorption. Polarization curves reveal that BRSM acts as a mixed‐type inhibitor in hydrochloride acid.