Naslov
An electrochemical study of the passive film formed on Ni-Cr (80/20) coating

Autori
Metikoš-Huković, Mirjana ; Omanović, Saša ; Babić, Ranko ; Milošev, Ingrid

Izvornik
Berichte der Bunsengesellschaft für Physikalische Chemie (0005-9021) 98 (1994), 10; 1243-1249

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

Ključne riječi
electrochemistry ; interfaces ; materials properties ; chromium ; electronic properties ; films ; nickel ; reduction ; spectroscopy ; sputter deposition ; surfaces

Sažetak
The passive state of Ni-Cr (80/20) coatings prepared by a plasma beam sputter deposition process was studied using cyclic voltammetry and impedance spectroscopy techniques. The highly protective quality of the film formed in acetate buffer, pH = 5.7, is probably based on chromic species. The nickel content in the film was very low and influenced only the electronic properties of the film. The appearance of a distinct transition in the capacitance potential characteristic may be correlated with the presence of higher valent chromium species. Cyclic voltammetry demonstrated that Cr(VI) was incorporated into the outer part of the oxide film, or was tenaciously adsorbed on the electrode surface. Its formation and reduction were reversible

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA