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Effect of sulphide ions on corrosion behaviour of iron in alkaline solutions
Faculty
Science
Year:
2008
Type of Publication:
Article
Pages:
225-230
Authors:
El Aal, E. E. Abd, El Haleem, S. M. Abd
DOI:
10.1179/174327808X272351
Journal:
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY MANEY PUBLISHING
Volume:
43
Research Area:
Materials Science; Metallurgy \& Metallurgical Engineering
ISSN
ISI:000260571900005
Keywords :
Iron, Sulphide, Passivation, Potential time, Oxide film
Abstract:
Potential time curves are constructed for Fe electrodes in aerated NaOH solutions devoid of, and containing, increasing concentrations of S2- ions. In sulphide free solutions, the steady state potentials are reached from negative values indicating oxide film thickening. Lower concentrations of S2- ions enhance oxide film thickening and the potential moves more in the noble direction. Increasing the S2- ion content causes the potential to fluctuate in the active and noble directions during a time span, which depends on the S2- ion content. The steady state potential of the iron varies linearly with both the concentration of S2- and pH of solution. A mechanism is proposed for the formation of FeS involving a two electron transfer process.
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