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

摘要

The corrosion properties of the passive layers formed on iron-nickel-chromium electrodeposits of Fe_(29)Ni_(51)Cr_(20) 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.Mo¨ssbauer spectroscopic measurements confirmed the existence of a thin passive layer on the amorphous electrodeposits.