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Stability of oxide films formed on mild steel in turbulent flow conditions of alkaline solutions at elevated temperatures Giddey, S., Cherry, B., Lawson, F. and Forsyth, M. 2001, Stability of oxide films formed on mild steel in turbulent flow conditions of alkaline solutions at elevated temperatures, Corrosion science, vol. 43, no. 8, pp. 1497-1517. Title Stability of oxide films formed on mild steel in turbulent flow conditions of alkaline solutions at elevated temperatures Author(s) Giddey, S. Cherry, B. Lawson, F. Forsyth, M. Journal name Corrosion science Volume number 43 Issue number 8 Start page 1497 End page 1517 Publisher Elsevier Place of publication Amsterdam, The Netherlands Publication date 2001-08 ISSN 0010-938X Keyword(s) bayer process magnetite film rotating cylinder electrode cyclic voltammetry potentiostatic transient Summary In the industries involving alkaline solutions in different process streams, the nature and stability of oxide films formed on the metallic surfaces determine the rates of erosion–corrosion of the equipment. In the present study the characteristics of the oxide films formed on AISI 1020 steel in a 2.75 M sodium hydroxide solution at temperatures up to 175°C, have been investigated by employing electrochemical techniques of cyclic voltammetry and chronoamperometry. The experiments were carried out in an autoclave system based upon a ‘rotating cylinder electrode’ geometry to determine the effects of turbulence on the stability of the films. The results suggest that little protection is afforded in the active region (at about −0.8 VSHE). In the passive region at low potentials (−0.6 V to −0.4 VSHE), it appears the films are compact and more stable, and therefore provide good protection. At higher potentials (>−0.4 VSHE) in the passive region, the results suggest that film formation and dissolution occur simultaneously and the increase in temperature and turbulence causes a breakdown of the passive film resulting in a situation similar to nonprotective magnetite growth. Language eng Field of Research 039999 Chemical Sciences not elsewhere classified Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences HERDC Research category C1.1 Refereed article in a scholarly journal Copyright notice ©2001, Elsevier Science Persistent URL http://hdl.handle.net/10536/DRO/DU:30030159 Document type: Journal Article Collection: Institute for Technology Research and Innovation Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Fri, 10 Sep 2010, 15:09:26 EST Fri, 17 Sep 2010, 14:39:38 EST Fri, 17 Sep 2010, 14:40:33 EST Fri, 17 Sep 2010, 14:41:41 EST Filtered Full Citation counts:   Cited 6 times in TR Web of Science Cited 16 times in Scopus Search Google Scholar Access Statistics: 268 Abstract Views, 0 File Downloads  -  Detailed Statistics Created: Fri, 10 Sep 2010, 15:09:26 EST

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