An experimental and theoretical investigation of adsorption characteristics of a Schiff base compound as corrosion inhibitor at mild steel/hydrochloric acid interface |
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| Authors: | I Ahamad C Gupta R Prasad M A Quraishi |
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| Affiliation: | (1) Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India;(2) Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, 221 005, India;(3) Department of Chemistry, Kutir P.G. College, Chakke, Jaunpur, 222 146, India; |
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| Abstract: | This study investigates the effect of a Schiff base namely 2-2-(2-(3-phenylallylidene)hydrazine carbonothioyl)hydrazinecarbonyl]benzoic
acid (SB), on corrosion inhibition of mild steel in 1 M HCl. Electrochemical impedance measurement, potentiodynamic polarization
and weight loss methods were applied to study adsorption of SB at metal/solution interface. Results revealed that SB is an
excellent inhibitor for mild steel corrosion in 1 M HCl; showing a maximum efficiency 99.5% at concentration of 1.36 × 10−6 M. Fourier transform infrared spectroscopy (FTIR) observations of the mild steel surface confirmed the formation of protective
film on the metal surface by studied compound. Polarization studies showed that SB is a mixed-type inhibitor. Adsorption process
obeyed Langmuir’s model with a standard free energy of adsorption (∆G°ads) of −46.7 kJ mol−1. Energy gaps for interactions between mild steel surface and inhibitor were found to be close to each other showing that
SB possess capacity to behave as both electron donor and acceptor. |
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