Phytochemical Quantification of Characteristics of Plant Extracts in Acidic Medium on Metal Inhibition

Abstract

Carbon steel coupon or specimen was analysed using X-ray Fluorescence Spectroscopy in determining the coupon’s composition and weighed before its total immersion into the acidic environment and acidic environment with different inhibitors (extract) respectively of different of concentration for a monitoring period of five day (120 hours). Corrosion inhibitive effect of moringa oleifera leaf (MOL), carrica papaya leaf (CPL) and coconut coir dust (CCD) extract respectively in mitigating the corrosion of carbon steel coupon in acidic environment (1MHC1 solution) were investigated. Thus, cold water extraction technique was applied in extracting the inhibitive components of these three different plants extract (MOL, CPL and CCD) applied as corrosion prevention or mitigation of metals in aggressive acidic environment at different concentrations of extracts between 100mg to 500mg. Penta-triacontene, Lobeline, 2-Pyrazoline, 1-Isopropyl-5-Methyl, Myrcene, Quinoline, Lupenon, Quinoline, 3-Methl, Phytic acid, Alpha-Silinene and Campesterol while Fourier infrared spectrophotometer were used to characterize the three different extracts (MOL, CPL and CCD) thereby identifying their functional groups as strong appearances of nitro, carboxylic acid, alcohols, phenol, ketone compounds for moringa oleifera extract (MOL), strong, broad and intermolecular appearances of alkylarylether, carboxylic acid, aliphatic primary amine, and alcohols compounds for coconut coir dust extract (CCD) respectively. The evaluated results of weight loss, corrosion rate and inhibition efficiency for these different plant extracts showed an improvement in the extracts inhibition efficiency or property of moringa oleifera, carica papaya and coconut coir extracts as the extracts concentration increases in the acidic environment thereby preventing weight loss and corrosion rate of carbon steel in acidic environment or medium.