Effect of grain size on corrosion of high purity aluminium

Ralston, K. D., Fabijanic, D. and Birbilis, N. 2011, Effect of grain size on corrosion of high purity aluminium, Electrochimica acta, vol. 56, no. 4, pp. 1729-1736.

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Title Effect of grain size on corrosion of high purity aluminium
Author(s) Ralston, K. D.
Fabijanic, D.
Birbilis, N.
Journal name Electrochimica acta
Volume number 56
Issue number 4
Start page 1729
End page 1736
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2011-01-15
ISSN 0013-4686
1873-3859
Keyword(s) aluminium
corrosion
ECAP
grain size
SPD
Summary A complete understanding of how grain refinement, grain size, and processing affect the corrosion resistance of different alloys has not yet been fully developed. Determining a definitive 'grain size-corrosion resistance' relationship, if one exists, is inherently complex as the processing needed to achieve grain refinement also imparts other changes to the microstructure (such as texture, internal stress, and impurity segregation). This work evaluates how variation in grain size and processing impact the corrosion resistance of high purity aluminium. Aluminium samples with a range of grain sizes, from ∼100 μm to ∼2000 μm, were produced using different processing routes, including cold rolling, cryo rolling, equal channel angular pressing, and surface mechanical attrition treatment. Evaluation of all the samples studied revealed a tendency for corrosion rate to decrease as grain size decreases. This suggests that a Hall-Petch type relationship may exist for corrosion rate and grain size. This phenomenon, discussed in the context of grain refinement and processing, reveals several interesting and fundamental relationships.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861201 Coated Metal and Metal-Coated Products
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2010, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30044346

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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