Gravimetric Performance Evaluation of Wood Vinegar Liquor and Wood Vinegar Liquor Nano-fluid Corrosion Inhibitors

Abstract

This research investigated the performances of Wood Vinegar Liquor (WVL) and Wood Vinegar Liquor Nanofluid (WVL+NP) as corrosion inhibitors on micro-alloyed steel immersed in 1.0 M HCl solution. Gravimetric method was used to determine effectiveness of the inhibitors by monitoring corrosion rates and evaluating inhibition efficiencies of inhibited and control (1.0 M HCl) solutions. The micro-alloyed steel samples were immersed in 1.0 M HCl, WVL-inhibited 1.0 M HCl and WVL+NP-inhibited 1.0 M HCl solutions respectively, for periods ranging 24 – 168 hours at a step of 24 hours. Results obtained indicates that from 24 - 72 hours, samples immersed in 1.0 M HCl, WVL-inhibited 1.0 M HCl and WVL+NP-inhibited 1.0 M HCl solutions experienced rises in corrosion rates, for which samples immersed in 1.0 M HCl recorded highest corrosion rate values within these periods. However, samples immersed in 1.0 M HCl showed decline in corrosion rate after reaching a maximum of 36.19 mmpy at 72 hours, to 12.29 mmpy at 168 hours. Whereas, Samples immersed in WVL-inhibited 1.0 M HCl and WVL+NP-inhibited 1.0 M HCl solutions continued to experience increased corrosion rates beyond 72 hours, attaining their maximum values of 30.44 and 30.79 mmpy respectively at 96 hours. Corrosion inhibition efficiencies evaluated showed that WVL inhibited corrosion of micro-alloyed steel in 1.0 M HCl by recording higher values in the range of 53.85 – 12.47% between 24 – 96 hours of immersion. When these inhibitors are used for period beyond 96 hours, they are like to worsen corrosive effect of 1.0 M HCl.