Citation: RAJA Pandian Bothi, RAHIM Afidah Abdul, OSMAN Hasnah, AWANG Khalijah. Inhibitory Effect of Kopsia Singapurensis Extract on the Corrosion Behavior ofMild Steel in AcidMedia[J]. Acta Physico-Chimica Sinica, ;2010, 26(08): 2171-2176. doi: 10.3866/PKU.WHXB20100646 shu

Inhibitory Effect of Kopsia Singapurensis Extract on the Corrosion Behavior ofMild Steel in AcidMedia

1.
School of Chemical Sciences, University Sains Malaysia, 11800 Penang, Malaysia; Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia

Received Date: 14 January 2010
Available Online: 17 May 2010

The influence of the alkaloid extract of Kopsia singapurensis on the corrosion behavior of mild steel (MS) in 1 mol·L^-1 HCl and 1 mol·L^-1 H₂SO₄ was studied using electrochemical techniques, viz., potentiodynamic polarization and AC impedance. The experimental results clearly show that the plant extract effectively inhibits corrosion in both acid media and the inhibition efficiency obtained from the electrochemical techniques is in od agreement. Furthermore, the polarization technique indicates that the extract acts as an anodic type inhibitor in HCl and as a mixed type in H₂SO₄. Scanning electron microscopy (SEM) was carried out to examine the surface morphological changes of metal specimens in both the inhibited and uninhibited solutions. SEM images show the formation of an adsorbed layer over the metal surface by the inhibitor molecule. The presence of alkaloidal constituents in the plant extract was confirmed by Fourier transform infrared (FTIR) spectroscopy and chemical analysis.
- Corrosion inhibitor,
- Kopsia singapurensis,
- Mild steel,
- Polarization,
- Impedance,
- SEM,
- FTIR
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沈阳化工大学材料科学与工程学院沈阳 110142