M. Metikoshukovic et al., AN ELECTROCHEMICAL STUDY OF THE PASSIVE FILM FORMED ON NI-CR(80 20) COATING/, Berichte der Bunsengesellschaft fur Physikalische Chemie, 98(10), 1994, pp. 1243-1249
Citations number
41
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
The passive state of Ni-Cr (80/20) coatings prepared by a plasma beam
sputter deposition process was studied using cyclic voltammetry and im
pedance 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 on
ly the electronic properties of the film. The appearance of a distinct
transition in the capacitance potential characteristic may be correla
ted with the presence of higher valent chromium species. Cyclic voltam
metry 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.