Enhanced corrosion resistance of tecoma stans extract on mild steel in 0.5m h2so4 solution

Inhibition of mild steel corrosion in 0.5M H2SO4 of Tecoma stans (leaves) has been studied using various investigation techniques such as weight loss, gasometric and polarization methods of monitoring corrosion. The influence of storage condition on inhibition efficiency of Tecoma stans extract was also studied. The result of the study revealed that the extract act as a potent inhibitor on mild steel in acid medium. The inhibition activity was confirmed by the different techniques and the inhibition efficiency of the extract increased with increasing concentration of the extract. The adsorption of the extract was found to be spontaneous and its adsorption characteristics were comparatively approximated by Langmuir, Temkin and Freundlich isotherms. Polarization studies showed that the extract is a mixed type inhibitor. The inhibition efficiency changes with storage period at lower concentration of the inhibitor.