Jeyaraj, T. and Raja, C. and Paramasivam, M. and Jayapriya, B.
(2005)
Inhibition of Corrosion of Mild Steel in 10 % Sulfamic Acid by Azo Dyes.
Transactions of the SAEST, 40 (1).
pp. 19-23.
Abstract
The inhibitive influence of 3-Nitro-4′-N,N-dimethylaminoazobenzene and 4-Nitro-4′-N,N-dimethylaminoazobenzene was
studied on the corrosion of mild steel in 10 % sulfamic acid. The values of percentage inhibition efficiency by the methods, showed
close agreement. The difference in inhibitive action was explained on the basis of their molecular structure. The p-isomer was
found to give the higher inhibition efficiency than m-isomer. The steady OCP value for mild steel, dipped in 10 % sulfamic acid,
was not considerably shifted by the increasing addition of the inhibitor. However, the corrosion of mild steel dipped in 10 %
sulfuric acid was predominantly under anodic control, in the presence and in the absence of the dye. Both the anodic and the
catholic processes are polarized considerably with the increasing concentration of the inhibitor. Therefore the inhibition is of
mixed type.
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