Publication: Effect of Andrographis paniculata (Burm.f.) Wall.ex Nees extract on corrosion of low C-steel in 0.1 M HCl
Issued Date
2016-01-01
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00035599
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2-s2.0-84994465448
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Mahidol University
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SCOPUS
Bibliographic Citation
Anti-Corrosion Methods and Materials. Vol.63, No.6 (2016), 470-476
Suggested Citation
Pawin Wongkhamprai, Manthana Jariyaboon Effect of Andrographis paniculata (Burm.f.) Wall.ex Nees extract on corrosion of low C-steel in 0.1 M HCl. Anti-Corrosion Methods and Materials. Vol.63, No.6 (2016), 470-476. doi:10.1108/ACMM-06-2014-1394 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/43390
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Title
Effect of Andrographis paniculata (Burm.f.) Wall.ex Nees extract on corrosion of low C-steel in 0.1 M HCl
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Abstract
© 2016, © Emerald Group Publishing Limited. Purpose: The aim of this work was to investigate how Andrographis paniculata (Burm.f.) Wall.ex Nees extract affected the corrosion of low-carbon (C) steel in 0.1M HCl. Design/methodology/approach: The Andrographis paniculata (Burm.f.) Wall.ex Nees was extracted into distilled water at 70°C for 1 h. The corrosion inhibition efficiency of the extract was determined in 0.1M HCl using weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy. The effects of extract concentrations and of temperature were investigated. Findings: The Andrographis paniculata (Burm.f.) Wall.ex Nees extract could inhibit the corrosion process of low-C steel in 0.1M HCl. With the extract concentration of 1 g/l, an inhibition efficiency of 96.3 per cent was obtained. The extract acted as an anodic inhibitor. The adsorption process of the extract was physisorption and it followed the Langmuir adsorption isotherm. Originality/value: This paper revealed that Andrographis paniculata (Burm.f.) Wall.ex Nees cultivated in Thailand, which was extracted using a simple and environmentally friendly method, could act as a very good green corrosion inhibitor for low-C steel in 0.1M HCl solution.