Journal
CARBOHYDRATE POLYMERS
Volume 156, Issue -, Pages 202-214Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.08.066
Keywords
Hydroxyethylcellulose; Potentiodynamic polarization; EIS; SEM; AFM
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Funding
- UGC, New Delhi
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The inhibitory effect of hydroxyethylcellulose (HEC) on A1020 carbon steel corrosion in 1 M HCl solution was evaluated at different concentrations and temperatures using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), UV-vis spectrophotometry, scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX), atomic force microscopy (AFM) and quantum chemical analysis. Inhibition efficiency was found to increase with increase in concentration of HEC but decreased with increasing temperature. Inhibitory effect of HEC mixed with minimal concentration of surfactants, triton X 100 (TX), cetyl pyridinium chloride (CPC) and sodium dodecyl sulfate (SDS) was also evaluated. HEC gets adsorbed onto the mild steel surface via mixed type adsorption. E-a, Delta H, Delta S and Delta G degrees(ads), the thermodynamic and activation parameters, were calculated and discussed. Adsorption of inhibitor on the steel/solution interface follows Langmuir adsorption isotherm. EIS suggests formation of protective layer over the carbon steel surface. Results of different experimental techniques pertaining to the inhibitory effect of HEC and HEC mixed with surfactants are in good agreement with theoretical quantum chemical investigation. (C) 2016 Elsevier Ltd. All rights reserved.
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