CORROSION INHIBITION MILD STEEL IN NaCl SOLUTION IN THE PRESENCE OF PROPOLIS EXTRACT

This work studies the corrosion inhibition of X52 5L carbon steel in a 0.51 mol dm(-3) sodium chloride solution in the presence of propolis extract. The inhibition efficiency of propolis extract was tested by its addition to the working solution and by making a solid propolis coating on the electrode surface. The results of potentiodynamic polarization method shown that propolis extract acts as a corrosion inhibitor of the anodic type whose efficiency increases with increasing temperature and with stirring of the solution. Electrochemical impendance spectroscopy confirmed the formation of a protective layer by adsorption of propolis extract on the electrode surface. The results of Fourier transform infrared spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy surface tests are consistent with the results of electrochemical testing.