Passivation of Aluminum-Molybdenum Alloys in Hydrochloric Acid (CROSBI ID 155893)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Metikoš-Huković, Mirjana ; Babić, Ranko ; Grubač, Zoran
engleski
Passivation of Aluminum-Molybdenum Alloys in Hydrochloric Acid
The electrochemical properties of the system Al-Mo alloy|anodic oxide film|1.0 M HCl solution were investigated as a function of alloy composition and applied potential in 1.0 M HCl. Voltammetry measurements have revealed that the alloy systems with x(Mo) higher than 0.50 behave almost like pure Mo. The alloy systems with x(Mo) lower than 0.45 showed the potential regions of primary and secondary passivities in which the structural and protective properties of the anodic oxide films were studied using electrochemical impedance spectroscopy. Orazems graphical methods and Mott-Schottky analysis were used to extract the values of parameters of the constant-phase element, interfacial capacitance, ohmic resistance, type of conductivity and concentration of charge carriers in the semiconducting oxide film, which are all from the high-frequency impedance data. The pseudo-inductive behavior observed at low-frequencies in the potential range of the secondary passivity was discussed in terms of the surface-charge approach based on the chemistry of the point defect model.
Supersaturated aluminum alloys; amorphous metals; passivity; semiconducting oxide film
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Podaci o izdanju
156 (12)
2009.
C435-C440
objavljeno
0013-4651
10.1149/1.3240875