Optimization of Green Corrosion Inhibitor Dosage in Acidic Medium: A Case Study of Hunteria umbellata Seed Extracts

Abstract

This study investigated the corrosion inhibition performance of Hunteria umbellata seed Extract (HUE) on mild steel in an acidic medium. A Box-Behnken design (BBD)-based optimization was used to analyze the factors affecting inhibition efficiency such as inhibitor concentration, temperature and time. Corrosion studies were carried out using gravimetric weight loss measurement and electrochemical polarization methods. The identification of the constituents of the HUE was done using phytochemical screening and GC-MS analysis. The surface morphology of the coupon was assessed using scanning electron microscopy (SEM). The research revealed that the inhibitor demonstrated good inhibition potential with optimum inhibition efficiency of 89.677% at a concentration of 0.98 g/L, after an immersion time of 10 h at a temperature of 30.22 °C.