Journal
CORROSION SCIENCE
Volume 53, Issue 5, Pages 1960-1968Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2011.02.015
Keywords
Magnesium; SEM; TEM; EIS; Anodic dissolution
Funding
- program for New Century Excellent Talents in University of China [NCET-09-0052]
- Fundamental Research Funds for the Central Universities [HEUCFZ1019]
- National Natural Science Foundation of China [50601007]
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The effect of hot extrusion on the corrosion behavior of AZ91 magnesiun alloy was investigated by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The results showed that the extruded alloy had lower corrosion resistance compared to cast alloy. This observation has been explained from point of view of microstructure changes, wherein the increased density of dislocation, twins and grain boundary increased the anodic dissolution of AZ91 alloy and rearrangement of beta phase accelerated the rate of both the anodic and cathodic process. (C) 2011 Elsevier Ltd. All rights reserved.
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