期刊
CORROSION SCIENCE
卷 69, 期 -, 页码 292-301出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2012.11.042
关键词
Mild steel; EIS; Polarization; SEM; IR spectroscopy; Acid corrosion
资金
- University Sains Malaysia [RU-1001/229/PKIMIA/811006, FRGS-203/PKMIA/671030]
- University of Malaya Research Grants [UMRG RG011/09BIO, UMRP 001-2012]
- Centre National de la Recherche Scientifique [57-02-03-1007]
The inhibition effect of Neolamarckia cadamba crude extract (bark, leaves) and pure alkaloid (3 beta-isodihydrocadambine) were investigated for mild steel corrosion in 1 M HCI medium. Potentiodynamic polarization, electrochemical impedance, scanning electron microscopy, FTIR spectroscopy and molecular modelling were employed for this study. Results showed that crude extracts and 3 beta-isodihydrocadambine reduced the corrosion rate significantly at all concentrations. Polarization measurements indicated that these green inhibitors acted through mixed type inhibition. SEM studies evidenced the formation of a protective film over metal surface while FTIR, supported by molecular modelling proved that this shielding effect was caused by alkaloids, particularly 30-isodihydrocadambine. (C) 2012 Elsevier Ltd. All rights reserved.
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