A study on transition of iron from active into passive state

Song, Guangling, Cao, Chu-Nan and Chen, Sheng-Hao (2005) A study on transition of iron from active into passive state. Corrosion Science, 47 2: 323-339. doi:10.1016/j.corsci.2004.05.027

Author Song, Guangling
Cao, Chu-Nan
Chen, Sheng-Hao
Title A study on transition of iron from active into passive state
Journal name Corrosion Science   Check publisher's open access policy
ISSN 0010-938X
Publication date 2005
Sub-type Article (original research)
DOI 10.1016/j.corsci.2004.05.027
Volume 47
Issue 2
Start page 323
End page 339
Total pages 17
Place of publication Oxford
Publisher Pergamon-Elsevier Science Ltd
Collection year 2005
Language eng
Subject C1
291499 Materials Engineering not elsewhere classified
680305 Metals (composites, coatings, bonding, etc.)
Abstract An investigation was carried out on the transition of an iron electrode from active to passive state in a sulphuric acid solution. It was found that the active-passive transition was an auto-catalytic process in which a pre-passive film grew on the electrode surface. The growing pre-passive film had a fractal edge whose dimension was affected by the applied passivating potential and the presence of chlorides in the solution. Applying a more positive passivating potential led to a faster active-passive transition and resulted in a more irregular pre-passive film. If chlorides were introduced into the sulphuric acid solution, the active-passive transition became more rapid and the pre-passive film more irregular. Apart from the influence on the growth of the pre-passive film, the presence of chlorides in the passivating solution was found to deteriorate the stability of the final passive film. All these phenomena can be understood if the passivating iron electrode is regarded as a dissipative system. To explain these results, a fractal pre-film model is proposed in this paper. (C) 2004 Elsevier Ltd. All rights reserved.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
2006 Higher Education Research Data Collection
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 15 Aug 2007, 06:22:45 EST