The structure of amines and their inhibitive action on the corrosion of 63Cu-37Zn in HNO3
1969; Elsevier BV; Volume: 9; Issue: 2 Linguagem: Inglês
10.1016/s0010-938x(69)80044-2
ISSN1879-0496
AutoresM.N. Desai, Y. C. Shah, M.H. Gandhi,
Tópico(s)Muon and positron interactions and applications
ResumoAbstract Aniline, o -chloroaniline, o -nitroaniline, o -anisidine, o -phenetidine, o -toluidine and anthranilic acid have been investigated as inhibitors of the corrosion of 63Cu-37Zn in 2–4N HNO 3 . Of the substances investigated, anthranilic acid is the most satisfactory inhibitor. Substitution of the ortho position of aniline by electronegative groups such as-Cl,-COOH,-NO 2 is beneficial to inhibitor action. The chloro, nitro and carboxyl substituents increase the velocity of diazotization in the ascending order Cl 2 which is in good agreement with the order of efficiency shown by ortho amines having these substituents, namely, o -nitroaniline > o -aminobenzoic acid > o -chloroaniline. However, the diazotization velocities of aniline, o -anisidine, o -phenetidine and o -toluidine are nearly identical but there is a difference in their inhibitor action and hence diazotization of amine and the consequent removal of nitrous acid does not seem to be the only reason of the retarding capacity of the amines. Probably, adsorption characteristics of amines on metal surface also play a significant role in inhibition.
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