Affiliation:
1. Africa Centre of Excellence in Future Energies and Electrochemical Systems (ACE‐FUELS) Federal University of Technology Owerri Imo Nigeria
2. Marine Chemistry and Corrosion Research Group Department of Marine Biology, Akwa Ibom, State University Owerri Imo Nigeria
Abstract
AbstractWater‐in‐diesel emulsions (WiDEs) have been developed in recent times to assuage costs as well as to minimize lethal emissions from diesel combustion, without engine modification. This study investigated the stability behavior of WiDE and the corrosion inhibition efficacy of the ethanol extract of Ocimum gratissimum (O. gratissimum) toward mild steel. The corrosion susceptibility of mild steel coupons immersed in the different WiDE formulations was monitored using gravimetric and surface probe techniques. The anti‐corrosion effect of O. gratissimum was also assessed. The findings revealed that out of WiDE with three different water content, WiDE with 10% water content had optimal stability and emulsion stability declined with a rise in water content. The mild steel's corrosion rate decreased with a rise in exposure duration. The ethanol extract of O. gratissimum has a substantial impact on the corrosion behavior of mild steel in WiDE, reaching an inhibition efficiency of 91.58%. Also, the apparent surface roughness and roughness data (Sq, Sa,) of mild steel immersed in WiDE10 are higher than the WiDE10 inhibited with O. gratissimum extract, which shows that corrosion was reduced upon the addition of O. gratissimum extract. The FTIR spectra proved the adsorption of the extract constituents on the mild steel surface in WiDE.