Journal
CARBOHYDRATE POLYMERS
Volume 160, Issue -, Pages 172-183Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.12.056
Keywords
Plantago polysaccharide; Corrosion inhibition; Potentiodynamic polarization; EIS; SEM
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Funding
- UGC, New Delhi
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Polysaccharide from Plantago ovata was investigated for its inhibition characteristics for carbon steel corrosion in 1 M HCl. The mucilage of the Plantago is comprised of a highly branched polysaccharide, arabinosyl (galaturonic acid) rhamnosylxylan (AX), which is mainly responsible for the corrosion inhibition of the carbon steel. The techniques that were used to assess the inhibition and adsorption properties of the AX in the acid solution are gravimetric method, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), atomic force microscopy (AFM), UV-vis spectroscopy and FTIR. Thermodynamic and activation parameters revealed that the spontaneous adsorption of AX on carbon steel was mixed type and predominantly chemical in nature. Quantum chemical analysis supports the proposed mechanism of inhibition. AX from Plantago could serve as a green corrosion inhibitor for the carbon steel in hydrochloric medium with good inhibition efficiency but low risk of environmental pollution. (C) 2016 Elsevier Ltd. All rights reserved.
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