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.
Highlights
Natural Products (NPs) have traditionally played an important role in industrial applications, including the discovery of drug NPs, which were the basis for most early medicines [1,2]
The IE% increased with inhibitor concentration, and this result was in agreement with those obtained from the potentiodynamic polarization measurements
3412.9 cm−1was due to O–H stretching vibration while the sharp peak at 1727.8 was due to carbonyl stretching. Both peaks at 2959.7 cm−1 and 2931.6 cm−1 were assigned to aromatic rings on chlorocurcumin
Summary
Natural Products (NPs) have traditionally played an important role in industrial applications, including the discovery of drug NPs, which were the basis for most early medicines [1,2]. Many organic compounds have been studied to investigate their corrosion inhibition potential, e.g., the effect of organic nitrogen compounds on the corrosion behavior of iron and steel in acidic solutions; these organic nitrogen compounds are usually employed for their rapid action [3,4]. Riggs and Hurd [10] reported that the heat of inhibitor adsorption could be obtained by comparing the activation energies of uninhibited and inhibited corrosion reactions. It is well established that the effect of temperature on the inhibition of an acid–metal reaction is highly complex, due to the many changes that occur on the metal surface, such as the rapid etching and desorption of the inhibitor, and because the inhibitor itself may undergo decomposition and/or rearrangement.
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