Measurement of the corrosion rate of magnesium alloys using Tafel extrapolation

Shi, Zhiming, Liu, Ming and Atrens, Andrej (2010) Measurement of the corrosion rate of magnesium alloys using Tafel extrapolation. Corrosion Science, 52 2: 579-588. doi:10.1016/j.corsci.2009.10.016


Author Shi, Zhiming
Liu, Ming
Atrens, Andrej
Title Measurement of the corrosion rate of magnesium alloys using Tafel extrapolation
Journal name Corrosion Science   Check publisher's open access policy
ISSN 0010-938X
Publication date 2010-02
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.corsci.2009.10.016
Volume 52
Issue 2
Start page 579
End page 588
Total pages 10
Editor G. T. Burstein
Place of publication Oxford, U.K
Publisher Pergamon Press
Collection year 2010
Language eng
Subject C1
970109 Expanding Knowledge in Engineering
091207 Metals and Alloy Materials
Formatted abstract
The hypothesis that the corrosion of Mg alloys can be adequately estimated using Tafel extrapolation of the polarisation curve is termed herein the electrochemical measurement hypothesis for Mg. In principle, such a hypothesis can be disproved by a single valid counter example. The critical review of Mg corrosion by Song and Atrens in 2003 indicated that, for Mg alloys, Tafel extrapolation had not estimated the corrosion rate reliably. This paper examines the recent literature to further examine the electrochemical measurement hypothesis for Mg. The literature shows that, for Mg alloys, corrosion rates evaluated by Tafel extrapolation from polarisation curves have not agreed with corrosion rates evaluated from weight loss and hydrogen evolution. Typical deviations have been ∼50–90%. These were much larger than the precision of the measurement methods and indicate a need for careful examination of the use of Tafel extrapolation for Mg. For research that nevertheless does intend to use Tafel extrapolation to elucidate corrosion of Mg associated with service, it is strongly recommended that these measurements be complemented by the use of at least two of the three other simple measurement methods: (i) weight loss rate, (ii) hydrogen evolution rate, and (iii) rate of Mg2+ leaving the metal surface. There is much better insight for little additional effort.
© 2009 Elsevier Ltd. All rights reserved.
Keyword Magnesium corrosion
Weight loss
Tafel extrapolation
Hydrogen evolution
AZ91
Behavior
Microstructure
Chloride
Mechanism
ZE41
NaCl
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 15 October 2009.

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Mechanical & Mining Engineering Publications
ERA 2012 Admin Only
 
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Created: Sun, 21 Feb 2010, 00:09:24 EST