Synergistic Effect of Halide Ions on the Corrosion Inhibition of Mild Steel in Hydrochloric Acid using Mangrove Tannin

摘要

The inhibitive effect of mangrove tannin (MT) on mild steel (MS) corrosion in 0.5 M hydrochloricacid solution was studied using electrochemical techniques and gravimetric method. The influence ofhalides viz., KCl, KBr and KI on the corrosion inhibition of MT were also investigated. Results showthat MT alone provided satisfactory inhibition on the corrosion of MS and it was also found that theinhibition efficiency increased synergistically in the presence of halide ions. The synergistic effect ofhalide ions was found to follow the order: KI > KBr > KCl. The inhibitor reduced the corrosion ratethrough adsorption process and obeyed the Langmuir adsorption isotherm.