**2.4 Electrochemical measurements**

Electrochemical measurements were carried out using a potentiostat IVIUM-STAT.XR (Holland). A three-electrode cell system containing working electrode (iron coupon) of a 1 cm<sup>2</sup> exposed area, saturated (Ag/AgCl) electrode as a reference electrode, and then a platinum wire as auxiliary electrode was used. The electrochemical impedance spectroscopy measurements were carried out using the mentioned electrochemical system. Polarization curves were recorded at a sweep rate of 50 mV s<sup>1</sup> . Electrochemical impedance spectroscopy measurements were carried out at open-circuit potential over a frequency range of 1 MHz to 1 Hz. The sinusoidal perturbation has an amplitude of 0.01 mV.

*Electrochemical,Thermodynamic, Surface, and Spectroscopic Study in Inhibition of Iron… DOI: http://dx.doi.org/10.5772/intechopen.92648*
