Corrosion and Natural Corrosion Inhibitors: A Case Study for C. microphyllus

Abstract

Worldwide, corrosion causes the value of the gross domestic product to decrease in industrialized countries by 4.26% and causes significant losses to industries including infrastructure. As a result, corrosion prevention and research related to it are extremely important. Some researchers are working to develop plant-based natural corrosion inhibitors, and experimental and computational studies are being conducted widely to prevent corrosion through cheap and environmental friendly coatings. A case study of Convolvulus microphyllus (C. microphyllus) extract was examined as eco-friendly for bio-corrosion inhibitor of mild steel in 0.5 M H2SO4 by using conventional weight loss, electrochemical polarization measurements, and electrochemical impedance spectroscopy (EIS) techniques. The compounds responsible for decreasing the rate of corrosion are kaempferol and phydroxycinnamic acid present in the extract. This inhibitor slows down the corrosion rate. Out of many observations, the best result 89.87% corrosion resistance efficiency was obtained at 600 mg/L of C. microphyllus as extract for mild steel in 0.5 M H2SO4 by applying electrochemical and weight loss measurements. The presence of a heteroatom in the main component of C. microphyllus as extract is believed to be an excellent inhibitor. Theoretical research revealed an entirely important report about comparative inhibition effect of different phytochemicals.