Abstract
During the anodic polarization of sulphur-doped nickel, selective dissolution of nickel and surface segregation of sulphur are observed. These phenomena cause a complete inhibition of passive layer formation when the sulphur content is above a critical concentration. Auger electron spectroscopy and electron spectroscopy for chemical analysis were used to characterize the species formed on the surface during the sulphur enrichment. The spectra were interpreted by comparison with standard spectra from synthesized compounds: NiS, Ni 3S 2, Ni-adsorbed S. A comparison with previous results using radioactive sulphur ( 35S) allowed us to determine the mechanism of the sulphur enrichment and of the consequent inhibition of passivation by the formation of an adsorbed sulphur layer and subsequent growth of a nickel sulphide Ni 3S 2 which attains a stationary thickness of about 30 Å.
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