Journal
CORROSION SCIENCE
Volume 98, Issue -, Pages 758-765Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2015.05.047
Keywords
Magnesium; EIS; TEM; SEM; Anodic dissolution; Negative difference effect
Funding
- U.S. DOE EERE Vehicle Technologies Office
- U.S. Department of Energy [DE-AC05-00OR22725]
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This study clarifies that the inner and outer layers of the anodic film consist of a nano/micro-porous MgO + Mg(OH)(2) mixture. The film becomes thicker and more porous with increasing potential. It can rupture when potential is too positive in a non-corrosive Mg(OH)(2) solution. Hydrogen evolution becomes more intensive as polarization potential increases, particularly when the potential at the film-covered Mg surface is close to or more positive than the hydrogen equilibrium potential, suggesting that an anodic hydrogen evolution (AHE) reaction occurs on the substrate Mg in film pores, and the significantly intensified AHE causes film rupture at high potential. (C) 2015 Elsevier Ltd. All rights reserved.
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