Abstract

The corrosion inhibition efficiency of Nicotiana tobacum (tobacco leaves) on the corrosion performance of zinc electrodeposited mild steel in 2 M HCl was studied using weight loss and gasometrical principle. The zinc electroplated mild steel coupon of 45 mm by 20 mm was immersed in HCl, in the presence of N. tobacumof varying extract concentration of 25, 55, 75 and 100 cm³  at 50°C elevated temperature  in 56 min. Increasing rate of hydrogen gas during the chemical reaction was examined. Inhibition feasibility was explained by formation of insoluble complex absorbing adhesion on the surface metal. However, results obtained indicate that, percentage of extract concentration increase as the number of H₂gas generated. Extract in acid medium retard corrosion degradation of the deposited mild steel and forcefully reduce corrosion rate. Micro structural examination through OPM, AFM and XRD revealed the morphology and evaluation performance of N. tobacum.

Key words: Environmental failure, Inhibitor, electroplated mild steel, Nicotiana tobacum, gasometric.