Neolamarckia cadamba alkaloids as eco-friendly corrosion inhibitors for mild steel in 1 M HCl media

被引：234
|
作者：
Raja, Pandian Bothi [1 ]
Qureshi, Ahmad Kaleem [2 ]
Rahim, Afidah Abdul [1 ]
Osman, Hasnah [1 ]
Awang, Khalijah [2 ]
机构：
[1] Univ Sains Malaysia, Sch Chem Sci, Usm 11800, P Pinang, Malaysia
[2] Univ Malaya, Fac Sci, Dept Chem, Kuala Lumpur 50603, Malaysia
来源：
CORROSION SCIENCE | 2013年 / 69卷
关键词：
Mild steel; EIS; Polarization; SEM; IR spectroscopy; Acid corrosion; LOW-CARBON STEEL; INDOLE ALKALOIDS; PART I; ACID; POLARIZATION; EXTRACT; DERIVATIVES; CURVES; LEAVES; RATES;
D O I：
10.1016/j.corsci.2012.11.042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：292 / 301
页数：10
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