Application of pure oxygen for the passivation of mild steel in high temperature and pressure Bayer liquor under conditions of disturbed flow

Kear, G. and Bremhorst, K. (2008) Application of pure oxygen for the passivation of mild steel in high temperature and pressure Bayer liquor under conditions of disturbed flow. Corrosion Science, 50 7: 1962-1970. doi:10.1016/j.corsci.2008.04.012


Author Kear, G.
Bremhorst, K.
Title Application of pure oxygen for the passivation of mild steel in high temperature and pressure Bayer liquor under conditions of disturbed flow
Journal name Corrosion Science   Check publisher's open access policy
ISSN 0010-938X
Publication date 2008-07
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.corsci.2008.04.012
Volume 50
Issue 7
Start page 1962
End page 1970
Total pages 8
Editor Burstein, G.T.
Place of publication United Kingdom
Publisher Pergamon
Collection year 2009
Language eng
Subject C1
0913 Mechanical Engineering
970102 Expanding Knowledge in the Physical Sciences
Abstract The passivation characteristics of sulfuric acid cleaned mild steel in spent Bayer liquor (pH 14.4 and 160 degrees C) are examined using a high pressure nickel flow loop. An entrained atmosphere of 99.90% v/v oxygen gas is incorporated as an experimental variable along with Reynolds number (141,700 and 50,950) and intensity of fluid now disturbance. State of passivation has been defined using criteria derived from transient polaristion resistance measurements an large-scale polarisation, linear sweep voltammetry. In the majority of cases, oxygenation introduces instantaneous passivation of the mild steel on contact with the Bayer liquor. In comparison to de-oxygenated and aerated electrolytes, this rapid rate of passivation can lead to LIP to an order of magnitude reduction in the quantity of charge associated with metal dissolution over 20 h. Although relative rates of corrosion when passive are low and largely independent of the level of flow disturbance, dissolution rates when passive are somewhat larger at the higher Reynolds number. (c) 2008 Elsevier Ltd. All rights reserved.
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mechanical & Mining Engineering Publications
 
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