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. 2013 Nov 27;6(12):5466-5477.
doi: 10.3390/ma6125466.

Electrochemical Study on Newly Synthesized Chlorocurcumin as an Inhibitor for Mild Steel Corrosion in Hydrochloric Acid

Ahmed A Al-Amiery  1   2 , Abdul Amir H Kadhum  3 , Abu Bakar Mohamad  4 , Ahmed Y Musa  5 , Cheong Jiun Li  6
Affiliations

Electrochemical Study on Newly Synthesized Chlorocurcumin as an Inhibitor for Mild Steel Corrosion in Hydrochloric Acid

Ahmed A Al-Amiery et al. Materials (Basel). .

Abstract

A new curcumin derivative, i.e., (1E,4Z,6E)-5-chloro-1,7-bis(4-hydroxy-3-methoxyphenyl)hepta-1,4,6-trien-3-one (chlorocurcumin), was prepared starting with the natural compound curcumin. The newly synthesized compound was characterized by elemental analysis and spectral studies (IR, ¹H-NMR and 13C-NMR). The corrosion inhibition of mild steel in 1 M HCl by chlorocurcumin has been studied using potentiodynamic polarization (PDP) measurements and electrochemical impedance spectroscopy (EIS). The inhibition efficiency increases with the concentration of the inhibitor but decreases with increases in temperature. The potentiodynamic polarization reveals that chlorocurcumin is a mixed-type inhibitor. The kinetic parameters for mild steel corrosion were determined and discussed.

Keywords: chlorocurcumin; corrosion inhibition; polarization; potentiodynamic.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Structure of chlorocurcumin.
Figure 2
Figure 2
Potentiodynamic polarization curves for mild steel in 1.0 M HCl at 30 °C with different concentrations of chlorocurcumin.
Figure 3
Figure 3
Nyquist plot for mild steel in 1.0 M HCl at 30 °C with different concentrations of chlorocurcumin.
Figure 4
Figure 4
Equivalent circuit model used to fit the impedance data for mild steel.
Figure 5
Figure 5
Arrhenius plot for mild steel in 1.0 M HCl.
Figure 6
Figure 6
Transition state plots for mild steel in 1.0 M HCl.
Figure 7
Figure 7
Adsorption isotherm for chlorocurcumin on the mild steel surface in 1.0 M HCl.
See this image and copyright information in PMC

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