Corrosion and Stress Corrosion Cracking of New Wrought Magnesium Alloys

Corrosion and Stress Corrosion Cracking of New Wrought Magnesium Alloys
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Guy Ben-Hamu
15 August 2013
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Abstract: New magnesium alloys (Die-Cast and wrought) have increasingly been developed in recent years for the automotive industry due to their high potential as structural materials for low density and high strength/weight ratio demands. However, their poor mechanical properties and low corrosion resistance have led to a search for new kinds of magnesium alloys with better strength, ductility, high temperature behaviour and high corrosion resistance. Th e main objective of this research is to investigate the corrosion behaviour of new magnesium alloys: Mg-Al-Ca, Mg-Al-Sr, Mg-Zn-Mn-Si (ZSM) and Mg-Zn-Mn-Si-Ca (ZSMX). Th ese ZSM6X1 and ZSM651+YCa alloys were prepared using hot extrusion. Th ese Mg-Al-Ca and Mg-Al-Sr were prepared using high pressure die cast. AC and DC polarization tests were carried out on the new alloys. Microstructure was examined using optical and electron microscopy (SEM) and EDS. Th e addition of Si increased the corrosion resistance. Th e additions of Sr and Ca also aff ected the corrosion behaviour. Th ese results can be explained by the eff ects of alloying elements on the microstructure of Mg alloys such as grain size and precipitates caused by the change in precipitation and recrystallisation behaviour.

Keywords: Magnesium Alloy, Die Cast, Hot Extrusion, Alloying Element, Electrochemical Techniques

Area: Nanotechnologies and Materials


  author = {Guy Ben-Hamu},
  title = {Corrosion and Stress Corrosion Cracking of New Wrought Magnesium Alloys},
  journal = {Challenges of Modern Technology},
  year = {2010},
  volume = {1},
  number = {1},
  pages = {79-87},
  url = {http://www.journal.young-scientists.eu/index.php/isuues/file/134-corrosion-and-stress-corrosion-cracking-of-new-wrought-magnesium-alloys}

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