Different Microgalvanic Corrosion Behavior of Cast and Extruded EW75 Mg Alloys

  • Liu J
  • Song Y
  • Shan D
  • et al.
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Abstract

© The Author(s) 2016. Published by ECS. All rights reserved. The size, distribution, and volume fraction of second phases are altered during extrusion deformation. As a result, the microgalvanic corrosion of Mg alloys will change. The corrosion behaviors of cast and extruded EW75 (Mg-5Y-7Gd-1Nd-0.5Zr) were studied by scanning electron microscopy observations, hydrogen evolution and weight loss measurements, and electrochemical tests. Extruded EW75, which has a lower volume fraction, smaller size, and more uniform distribution of second phases, is found to exhibit better corrosion resistance than cast EW75; the difference can be attributed to weaker microgalvanic corrosion and a more protective surface film.

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Liu, J., Song, Y., Shan, D., & Han, E.-H. (2016). Different Microgalvanic Corrosion Behavior of Cast and Extruded EW75 Mg Alloys. Journal of The Electrochemical Society, 163(14), C856–C863. https://doi.org/10.1149/2.0481614jes

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