Chemical, electrochemical, and surface studies of <i>Rosa damascene</i> extract as a green corrosion inhibitor for carbon steel in sulfuric acid environment

Abstract

Abstract To develop an environmentally acceptable corrosion inhibitor Rosa damascene extract (RD) served as the main ingredient in H 2 SO 4 pickling processes. X‐ray photoelectron spectroscopy (XPS), Fourier‐transform infrared spectroscopy (FT‐IR), technique of electrochemical impedance spectroscopy (EIS), polarization (PP) curves, and tests of weight loss (WL) have all been utilized to examine the inhibitory behavior of Rosa damascene on C‐steel corrosion in 1 M H 2 SO 4 environment. The results show that the extract effectively inhibited the Zn′ corrosion in 1 M H 2 SO 4 . The inhibition was more effective at higher concentrations and temperatures. The inhibitory efficiency increased to 93.5% at a higher applied temperature (45°C) and higher Rosa damascene concentration (300 ppm). However, utilizing the weight loss method at potassium iodide addition, the inhibitory effectiveness of 300 ppm of Rosa damascene was synergistically increased from 75.0% to 96.1% at 25°C. Temkin isotherm was congruent with the adsorption process that produced the inhibitory impact on the C‐steel. The chemical adhesion of the Rosa damascene extract to the surface of the C‐steel was determined by the free energy of adsorption (ΔG o ads = 40.5 kJ/mol.). In H 2 SO 4 solution, corrosion of C‐steel may be prevented by the powerful inhibitor Rosa damascene extract.