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Physicochemical Studies of 4‐Substituted N ‐(2‐Mercaptophenyl)‐Salicylideneimines: Corrosion Inhibition of Mild Steel in an Acid Medium
Author(s) -
Kesavan Devarayan,
Tamizh Manoharan Muthu,
Gopiraman Mayakrishnan,
Sulochagarajan,
Karvembu Ramasamy
Publication year - 2012
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-012-1338-z
Subject(s) - chemistry , hydrochloric acid , adsorption , corrosion , dielectric spectroscopy , langmuir adsorption model , electrochemistry , scanning electron microscope , nuclear chemistry , inorganic chemistry , organic chemistry , electrode , physics , quantum mechanics
A series of 4‐substituted N ‐(2‐mercaptophenyl)salicylideneimine Schiff bases were synthesized and investigated for corrosion inhibition of mild steel in hydrochloric acid medium. Inhibition through adsorption mechanism is proposed for these inhibitors, which is well supported by electrochemical impedance spectroscopy, the Langmuir adsorption isotherm and Scanning Electron Microscope morphologies of inhibited and uninhibited mild steel specimens. The negative ∆ G ads indicates the spontaneous adsorption of the inhibitor on a mild steel surface. Among all the examined inhibitors, 5‐bromo‐ N ‐(2‐mercaptophenyl)salicylideneimine showed a higher inhibition efficiency. In order to reveal the usefulness of these Schiff bases as corrosion inhibitors under various circumstances, weight loss measurements were performed at various temperatures, acid concentrations and immersion times.