Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2012 Vol: 4 Issue: 7

Salicylideneaniline as inhibitor for the corrosion of mild steel in 1.0 N hydrochloric acid


The inhibitive influence of salicylideneaniline on the corrosion of mild steel in 1.0 N hydrochloric a cid was studied by weight loss method and polarization measurements . The values of percentage inhibition efficiency, d etermined by these methods, showed close agreements. The corrosi on decreased with increasing addition of salicylide neaniline probably due to the progressive adsorption of the i nhibitor on the metal surface. The maximum inhibiti on efficiency was found to be 39.71%. The inhibition process was tested for Langmuir adsorption isotherm, kinetic thermodynamic modal of El-Awady et al. Temkin and Flory-Huggins isotherms. The best fit isotherm was the isotherm of El-Awady et al, The phenomenon of phys isorption was proposed for the process of inhibitio n. The open circuit potential of mild steel in 1.0 N HCl, in th e presence of the inhibitor of varying concentratio ns, did not show any significant shift in its values. The polarizati on studies revealed that the corrosion of mild stee l in 1.0 N HCl was predominantly under anodic control, in the presence as well as in the absence of the inhibitor. The na ture of inhibition was found to be of mixed type.