An innovative specimen configuration for the study of Mg corrosion

Shi, ZM and Atrens, A (2011) An innovative specimen configuration for the study of Mg corrosion. Corrosion Science, 53 1: 226-246.


Author Shi, ZM
Atrens, A
Title An innovative specimen configuration for the study of Mg corrosion
Journal name Corrosion Science   Check publisher's open access policy
ISSN 0010-938X
Publication date 2011-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.corsci.2010.09.016
Volume 53
Issue 1
Start page 226
End page 246
Total pages 21
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2011
Language eng
Formatted abstract Based on an analysis of galvanic corrosion research, the research reported herein was formulated to examine the measurement of polarisation curves for Mg to develop a methodology whereby reliable polarisation curves can be measured for Mg. Cathodic polarisation curves were measured for high purity Mg in 3.5% NaCl saturated with Mg(OH)2 using three specimen types: (i) mounted specimens, (ii) specimens hung by fishing line and (iii) plug-in specimens. Cathodic polarisation curves were evaluated to yield the corrosion current density icorr and the corresponding corrosion rate Pi, which was compared with the corrosion rate evaluated from hydrogen evolution measurements, PH, and the corrosion rate evaluated by weight loss measurements, PW. Mounted specimens produced values of corrosion rate, Pi, three times larger than values of corrosion rate, Pi, for plug-in specimens, attributed to crevice corrosion in the mounted specimens. Crevice corrosion in Mg is totally unexpected from prior research. The plug-in specimen configuration was designed to have no crevice and to allow simultaneous measurement of PH and Pi; Pi was consistently less than PH and indicated an apparent valence for Mg of 1.45 in support of the Mg corrosion mechanism involving the uni-positive Mg+ ion. The plug-in specimen has advantages for the study of Mg corrosion. © 2010 Elsevier Ltd.
Keyword Magnesium
Polarisation
SEM
Weight loss
Crevice corrosion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2011 Collection
 
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Created: Sun, 26 Dec 2010, 00:08:39 EST