Naslov
Passivation and corrosion behaviours of cobalt and cobalt-chromium-molybdenum alloy

Autori
Metikoš-Huković, Mirjana ; Babić, Ranko

Izvornik
Corrosion science (0010-938X) 49 (2007), 9; 3570-3579

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

Ključne riječi
cobalt; alloy; cyclic voltammetry; EIS; passivity

Sažetak
Passivation and corrosion behaviour of the cobalt and cobalt-base alloy Co30Cr6Mo was studied in a simulated physiological solution containing chloride and bicarbonate ions and with pH of 6.8. The oxido-reduction processes included solid state transformations occurring at the cobalt/electrolyte interface are interpreted using theories of surface electrochemistry. The dissolution of cobalt is significantly suppressed by alloying it with chromium and molybdenum, since the alloy exhibited chromium like passivity. The structural and protective properties of passive oxide films formed spontaneously at the open circuit potential or during the anodic polarization were studied using electrochemical impedance spectroscopy in the wide frequency range.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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