Electrochemical evaluation of green corrosion inhibitor based on ground coffee waste in Petroleum fields

Abstract

Corrosion poses a significant challenge in industrial sectors that handle metallic materials. The objective of this study was to evaluate the feasibility of employing a cost-effective, organic, and eco-friendly solution derived from discarded coffee grounds, known as coffee waste extract (CE), to mitigate the corrosion rate of carbon steel in an acidic environment comprising 0.5 M hydrochloric acid (HCL) with varying concentrations ranging from 20 to 100 ppm. This research aims to explore the prospective utilization of coffee waste as an inhibitory agent that can be reutilized for diverse purposes. Moreover, the extraction process in this work is done by using only water extraction. Measurements of weight loss and hydrogen evaluation methods (HEM) showed that the corrosion rate of carbon steel decreased by raising the CE inhibitor concentration. Electrochemical impedance spectroscopy (EIS) confirmed decreasing the capacitance of double-layer Cdl values due to increasing the amount of the inhibitor in the system. The observed reduction in capacitance Cdl is attributed to increasing the width of the electrical double layer. This indicates that the inhibitor particles work through sorption at the contact of the acid solution and carbon steel. Results of the polarization test determined CE act as an inhibitor of mixed types. This causes a reduction in anodic and cathodic reactions of carbon steel in 0.5 M HCl. All the results of the above experiments assure the productivity of the extract enhanced by increasing the extract dosage, science the initial efficiency (IE) was equal to 76% at 20 ppm and reached 96% at 100 ppm.