Characterization of the passive films on electrodeposited Fe-Ni-Cr alloys in borate solution at pH 8.4

Abstract

The corrosion properties of the passive layers formed on iron-nickel-chromium electrodeposits of Fe29Ni51 Cr20 were investigated in 0.3 M borate solution at a' pH of 8.4. On the basis of measurements by cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy, a low passive dissolution/corrosion rate was identified for the electrodeposited Fe-Ni-Cr alloys due to the nature of the established corrosion layer. The stability of this passive layer was further enhanced after corrosion under oxidizing conditions. Mössbauer spectroscopic measurements confirmed the existence of a thin passive layer on the amorphous electrodeposits. © Versita Warsaw and Springer-Verlag Berlin Heidelberg 2007.