Effect of sulphate and molybdate ions on pitting corrosion of aluminium by using electrochemical noise analysis

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The effects of sulphate and molybdate ion additives on the pitting corrosion of pure aluminium were investigated as a function of anion concentration by using potentiodynamic polarisation experiment and electrochemical noise measurement. The cumulative probability determined from shot-noise theory was quantitatively analysed by using the Weibull distribution function based upon a stochastic theory. From the statistical variation in the frequency of events, it was found that the width of the distribution of the frequency of events was broader in the presence of sulphate ions. On the other hand, the distribution of the frequency of events shifted to a lower frequency region in the presence of molybdate ions. From the results, it was concluded that both sulphate and molybdate ions retards the pit initiation. Moreover, from the two linear regions in one Weibull probability plot, it was concluded that pitting corrosion was clearly distinguished from uniform corrosion in the stochastic analysis. (c) 2006 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2006-10
Language
English
Article Type
Article
Keywords

STOCHASTIC APPROACH; LOCALIZED CORROSION; STAINLESS-STEEL; PURE ALUMINUM; PIT GROWTH; ALLOY; FILM; ADDITIVES; KINETICS

Citation

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v.596, no.1, pp.7 - 12

ISSN
0022-0728
DOI
10.1016/j.jelechem.2006.06.017
URI
http://hdl.handle.net/10203/86849
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