Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry

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Inhibitory effect of some dyes on 60/40 brass in nitric acid

Author(s): M. B. Mahida, H. G. Chaudhari and M. H. Metawala

The inhibition effect of some dyes like methyl red, eriochrome black-T, congo red and alizarin red-S on the corrosion of 60/40 brass in nitric acid solution has been studied by using weight-loss and galvanostatic polarization technique. The corrosion rate was calculated in the presence and absence of the various dyes. The efficiency of the inhibitors was increases with increase in the inhibitor concentration and decreases with increase of temperature. The activation energy was obtained through weight-loss experiment at different temperature. For all the inhibitors the heat of adsorption (Qads) and the free energy of adsorption (DGads) obtained were negative. The plot of log(q/1-q) versus log C results in a straight line, which suggest that the inhibitors function through Langmuir adsorption isotherm. The polarization results show that the inhibitors are of mixed type inhibitor.


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