Naslov
Passivation of Aluminum-Molybdenum Alloys in Hydrochloric Acid

Autori
Metikoš-Huković, Mirjana ; Babić, Ranko ; Grubač, Zoran

Izvornik
Journal of the Electrochemical Society (0013-4651) 156 (2009), 12; C435-C440

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Supersaturated aluminum alloys; amorphous metals; passivity; semiconducting oxide film

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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