Journal
CORROSION SCIENCE
Volume 101, Issue -, Pages 94-104Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2015.09.005
Keywords
Alloy; Magnesium; SEM; STEM; TEM; Interfaces
Funding
- University of Michigan College of Engineering
- Office of Naval Research [0014-12-1-0013]
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The corrosion microstructure of a WE43 Mg alloy immersed in 3.5 wt% NaCl solution saturated with Mg(OH)(2) was characterized across several length scales in order to understand the relationship between corrosion behavior and the alloy microstructure developed after solution treatment and aging. Hydrogen bubbles evolved and protruding Mg(OH)(2) domes formed on Zr-rich impurity particles by a microgalvanic effect. The observed porous bi-layered corrosion film was explained by inward oxidation and hydration reactions. Aging treatment decreased the corrosion rate of the alloy via the interactions between the finely dispersed precipitates and the corrosion reactions. (C) 2015 Elsevier Ltd. All rights reserved.
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