Kaempferol as a corrosion inhibitor on mild steel in HCl

The Kaempferol (KFR), is investigated as a corrosion inhibitor for C38 steel in HCl solution using impedance spectroscopy, polarization curves measurement and weight loss studies. Results obtained reveal that the Kaempferol performs excellently as a corrosion inhibitor for C38 steel in 1.0 M HCl and indicate that the inhibition efficiency increases with the concentration of the inhibitor to reach 96.0 % at 2.10-3 M of the Kaempferol. The effect of temperature on the corrosion behavior of carbon steel in 1 M HCl was also studied. Polarization curves showed that the Kaempferol behaves as a mixed-type inhibitor. The adsorption of the inhibitor on the carbon steel surface obeyed the Langmuir adsorption isotherm. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability. Data obtained from EIS technique, were analyzed to model the corrosion inhibition process through appropriate equivalent circuit model; a constant phase element (CPE) has been used. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated and discussed