ISSN:
1572-8838
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract 270 Nickel has a sulphur content lower than 1 p.p.m. However, surface concentrations close to saturation values can be obtained after several hours of cold-hammering followed by annealing procedures. The effects of this segregation on the electrochemical behaviour of nickel are analysed using current-potential curves and by examining the corrosion features via scanning electron microscopy (SEM). An overall increase in dissolution for the nickel with surface segregation of sulphur with respect to the homogeneous metal is observed in acidic (1m H2SO4) as well as in alkaline medium [(K2SO4+LiOH) at pH 9.5]. The reaction model proposed here, which depicts the dissolution kinetics, allows specification of the depassivating role of sulphur.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01093012
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