Potential anticorrosive performance of green and sustainable inhibitor based on cellulose derivatives for carbon steel

Abstract

Cellulose tetrazole (CTZ) was synthesized and tested as a benign corrosion inhibitor for carbon steel in 1 M HCl solution. Fourier-transform infrared spectroscopy (FT-IR) spectral technique, scanning electron microscope (SEM), X-ray diffraction (XRD) and thermal gravimetric analysis (TGA) were used to characterize the synthesized CTZ. The inhibitory effect of CTZ was investigated further on carbon steel corrosion in 1 M HCl using a variety of techniques including weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The surface of carbon steelwith and without CTZinhibiters was characterized by a combination of Scanning Electron Microscopy (SEM) andEnergy Dispersive X-ray Spectroscopy (EDX). Corrosive solutions were studied with UV Spectroscopy. The spectrum reported confirm the adsorption of these molecules on the iron surface, thus forming the adsorption film of a Fe-inhibitor. Electrochemical experiments indicated that CTZ works as a high performance environmentally friend carbon steel inhibitor in 1 M HCl medium, with the maximum efficiency of 94.2% at 100 ppm. The good results were attributed to the creation of CTZ adsorption films, which followed the Langmuir adsorptive process according to potentiodynamic polarization measurements. The formation of CTZ adsorption films, which followed the Langmuir adsorption isotherm, was ascribed with the favorable corrosion inhibition performance. SEM and roughness images have shown that the CTZ could effectively block acid assault by formation of adsorbed film on carbon steel surface. CTZ was found to be a mixed type corrosion inhibitor that acted predominantly as a cathodic inhibitor in electrochemical experiments.