A thermodynamical, electrochemical and surface investigation of Bis (indolyl) methanes as Green corrosion inhibitors for mild steel in 1 M hydrochloric acid solution
By Verma, Chandrabhan; Singh, Pooja; Quraishi, M. A.
Published in Journal of the Association of Arab Universities for Basic and Applied Sciences
NULL
2016
Abstract
Abstract The influence of three Bis (indolyl) methanes (BIMs) namely, 3,3?-((4-nitrophenyl) methylene) bis (1H-indole) (BIM-1), 3,3?-(phenyl methylene) bis (1H-indole) (BIM-2) and 4-((1H-indol-2-yl)(1H-indol-3-yl) methyl) phenol (BIM-3) on the mild steel corrosion in 1 M {HCl} was studied by weight loss, electrochemical, scanning electron microscopy (SEM), and dispersive X-ray spectroscopy (EDX) methods. Results showed that BIM-3 shows maximum inhibition efficiency of 98.06% at 200 mg L?1 concentration. Polarization study revealed that the {BIMs} act as mixed type inhibitors. Adsorption of {BIMs} on the mild steel surface obeyed the Langmuir adsorption isotherm. The weight loss and electrochemical results were well supported by {SEM} and {EDX} studies.
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