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Enhanced corrosion resistance of Mg alloy ZK60 after processing by integrated extrusion and equal channel angular pressing

Orlov, D. LU ; Ralston, K. D.; Birbilis, N. and Estrin, Y. (2011) In Acta Materialia 59(15). p.6176-6186
Abstract

It was demonstrated in this work that the corrosion rate of Mg alloy ZK60 can be reduced through the use of an integrated process of extrusion and equal channel angular pressing concomitant with increased strength. The improvement in corrosion resistance, as measured by electrochemical experiments and immersion tests in NaCl electrolytes, was correlated with both grain refinement and the redistribution of Zn and Zr solutes within the microstructure. These microstructural changes impacted the relative anodic and cathodic reaction kinetics sustained by the alloy in a unique manner, whereby structural and chemical variations dictated the anodic reaction rates in the former and the cathodic rates in the latter. The observed decrease in the... (More)

It was demonstrated in this work that the corrosion rate of Mg alloy ZK60 can be reduced through the use of an integrated process of extrusion and equal channel angular pressing concomitant with increased strength. The improvement in corrosion resistance, as measured by electrochemical experiments and immersion tests in NaCl electrolytes, was correlated with both grain refinement and the redistribution of Zn and Zr solutes within the microstructure. These microstructural changes impacted the relative anodic and cathodic reaction kinetics sustained by the alloy in a unique manner, whereby structural and chemical variations dictated the anodic reaction rates in the former and the cathodic rates in the latter. The observed decrease in the corrosion rate, combined with improved mechanical properties for ZK60, represents a scenario where two properties that are nominally inversely correlated can be improved simultaneously, offering an insight into how Mg can be unique in terms of its processing-property relationships.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Corrosion, Grain refinement, Magnesium, Microstructure, Severe plastic deformation
in
Acta Materialia
volume
59
issue
15
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:79960975484
ISSN
1359-6454
DOI
10.1016/j.actamat.2011.06.033
language
English
LU publication?
no
id
c8640dca-2da8-49f2-af0f-290a28b44be5
date added to LUP
2016-06-20 15:39:08
date last changed
2017-11-19 04:31:38
@article{c8640dca-2da8-49f2-af0f-290a28b44be5,
  abstract     = {<p>It was demonstrated in this work that the corrosion rate of Mg alloy ZK60 can be reduced through the use of an integrated process of extrusion and equal channel angular pressing concomitant with increased strength. The improvement in corrosion resistance, as measured by electrochemical experiments and immersion tests in NaCl electrolytes, was correlated with both grain refinement and the redistribution of Zn and Zr solutes within the microstructure. These microstructural changes impacted the relative anodic and cathodic reaction kinetics sustained by the alloy in a unique manner, whereby structural and chemical variations dictated the anodic reaction rates in the former and the cathodic rates in the latter. The observed decrease in the corrosion rate, combined with improved mechanical properties for ZK60, represents a scenario where two properties that are nominally inversely correlated can be improved simultaneously, offering an insight into how Mg can be unique in terms of its processing-property relationships.</p>},
  author       = {Orlov, D. and Ralston, K. D. and Birbilis, N. and Estrin, Y.},
  issn         = {1359-6454},
  keyword      = {Corrosion,Grain refinement,Magnesium,Microstructure,Severe plastic deformation},
  language     = {eng},
  number       = {15},
  pages        = {6176--6186},
  publisher    = {Elsevier},
  series       = {Acta Materialia},
  title        = {Enhanced corrosion resistance of Mg alloy ZK60 after processing by integrated extrusion and equal channel angular pressing},
  url          = {http://dx.doi.org/10.1016/j.actamat.2011.06.033},
  volume       = {59},
  year         = {2011},
}