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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.

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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
1879-0496
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
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