Author/Authors :
Elbadaoui, Azeddine Laboratory of Materials, Electrochemistry and Environment, Faculty of Science - Ibn Tofail University, Kénitra, Morocco , Galai, Mouhsine Department of Chemistry - Faculty of Sciences - University Ibn Tofail, Kenitra, Morocco , Ferraa, Soumya Laboratory of Materials, Electrochemistry and Environment, Faculty of Science - Ibn Tofail University, Kénitra, Morocco , Barebita, Hanane Laboratory of Materials, Electrochemistry and Environment, Faculty of Science - Ibn Tofail University, Kénitra, Morocco , Cherkaoui, Mohammed Laboratory of Materials, Electrochemistry and Environment, Faculty of Science - Ibn Tofail University, Kénitra, Morocco , Guedira, Taoufiq Laboratory of Materials, Electrochemistry and Environment, Faculty of Science - Ibn Tofail University, Kénitra, Morocco
Abstract :
The corrosion inhibition of carbon steel in acidic medium (1 M HCl) containing a borated vitreous glasses was studied by electrochemical technique (potentiodynamic polarization and electrochemical impedance spectroscopy).The various vitreous samples were synthesized from ammonium dihydrogen phosphate (NH4) 2HPO4), the niobium oxide Nb2O5, the Bi2O3 bismuth oxide, the B2O3 boron oxide and the niobium oxide Nb2O5. The vitreous compositions are correlated with the system Bi2O3-B2O3- (0.5Nb2O5 -0.5P2O5) by stoichiometric mixing. These phases were characterized by X-ray diffraction (XRD) and infrared spectroscopy (IR). Polarization curve technique reveals that the inhibition efficiency E% increased with the concentration of the different borated vitreous which appears to be a anodic type inhibitors in the acidic medium. Electrochemical impedance spectroscopy confirms this result, indeed the transfer resistance increases with these compounds concentration. The action mechanism of vitreous phases has been elucidated by a thermodynamic study.
Keywords :
Borated glasses , 1.0 M Hydrochloric acid , Steel , Corrosion inhibitor
