Garcinia gummigutta Vegetable Oil–Graphene Oxide Nano-composite: An Efficient and Eco-friendly Material for Corrosion Prevention of Mild Steel in Saline Medium

Garcinia gummigutta vegetable oil (GGVO) is a rich source of stearic and oleic acid which on heat treatment at around 300 °C, will get polymerized with highly conjugated network system. The present work intended to exploit the properties of GGVO for the production of eco-friendly anti-corrosion coating material. The oil extracted from GG seeds was used to prepare graphene oxide (GO) dispersion in oil and successfully employed as an efficient anti-corrosion coating material on mild steel (MS). All coatings are done by simple heat treatment of dip-coated MS specimen. The corrosion prevention ability of the coating was studied by potentiodynamic polarization and electrochemical impedance spectroscopy techniques in 3.5% NaCl solution. Electrochemical results showed that the addition of GO significantly enhances the corrosion inhibition performance of the GGVO coating. The inhibition efficiency of the GGVO coating increased from 93.0 to 99.8% on the incorporation of 0.3 wt% of GO into the oil. The enhancement of the corrosion prevention ability of the GO ink is discussed based on the impermeable action of GO to the corrosive ions and also suppression of the number of pores in the polymer that is formed during the curing of the coating. Graphic Abstract