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Corrosion inhibition of carbon steel in hydrochloric acid solution by rice bran extracts

Corrosion inhibition of carbon steel in hydrochloric acid solution by rice bran extracts Purpose – The paper reports an investigation into the use of aqueous extracts of rice bran as a green inhibitor for corrosion of carbon steel in hydrochloric acid (HCl) solution. Design/methodology/approach – Extracts from the rice bran were used as the main component of an environmentally friendly corrosion inhibitor for use in HCl pickling processes. Inhibition behavior on carbon steel in HCl was investigated by means of mass‐loss tests, polarization curves, electrochemical impedance spectroscopy and atomic force microscopy. Findings – The results show that the extract exhibited good inhibition performance in 1 M HCl. The inhibition efficiency increased with increase in the concentration of the inhibitor and was only moderately affected by temperature variations in the range 303‐363 K. The inhibitive action was due to adsorption on the A3 steel and the adsorption process was consistent with the Langmuir isotherm. The free energy of adsorption (ΔG ads. ) was −4.192 kJ/mol. The negative value of ΔG ads. indicated spontaneous adsorption of the inhibitor occurred on the surface of A3 steel. Practical implications – Rice bran extract is an effective inhibitor and can be used to protect carbon steel from corrosion in HCl solution. Originality/value – The rice bran extracts are an effective green inhibitor and can be widely used in the pickling of metals. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

Corrosion inhibition of carbon steel in hydrochloric acid solution by rice bran extracts

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References (16)

Publisher
Emerald Publishing
Copyright
Copyright © 2011 Emerald Group Publishing Limited. All rights reserved.
ISSN
0003-5599
DOI
10.1108/00035591111148920
Publisher site
See Article on Publisher Site

Abstract

Purpose – The paper reports an investigation into the use of aqueous extracts of rice bran as a green inhibitor for corrosion of carbon steel in hydrochloric acid (HCl) solution. Design/methodology/approach – Extracts from the rice bran were used as the main component of an environmentally friendly corrosion inhibitor for use in HCl pickling processes. Inhibition behavior on carbon steel in HCl was investigated by means of mass‐loss tests, polarization curves, electrochemical impedance spectroscopy and atomic force microscopy. Findings – The results show that the extract exhibited good inhibition performance in 1 M HCl. The inhibition efficiency increased with increase in the concentration of the inhibitor and was only moderately affected by temperature variations in the range 303‐363 K. The inhibitive action was due to adsorption on the A3 steel and the adsorption process was consistent with the Langmuir isotherm. The free energy of adsorption (ΔG ads. ) was −4.192 kJ/mol. The negative value of ΔG ads. indicated spontaneous adsorption of the inhibitor occurred on the surface of A3 steel. Practical implications – Rice bran extract is an effective inhibitor and can be used to protect carbon steel from corrosion in HCl solution. Originality/value – The rice bran extracts are an effective green inhibitor and can be widely used in the pickling of metals.

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: Jun 28, 2011

Keywords: Corrosion inhibitors; Green inhibitor; Rice; Acids; Inhibition mechanism

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