Effects of secondary phase and grain size on the corrosion of biodegradable Mg-Zn-Ca alloys

  • Lu Y
  • Bradshaw A
  • Chiu Y
 et al. 
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Abstract

The bio-corrosion behaviour of Mg-3Zn-0.3Ca (wt.%) alloy in simulated body fluid (SBF) at 37 °C has been investigated using immersion testing and electrochemical measurements. Heat treatment has been used to alter the grain size and secondary phase volume fraction; the effects of these on the bio-corrosion behaviour of the alloy were then determined. The as-cast sample has the highest bio-corrosion rate due to micro-galvanic corrosion between the eutectic product (Mg + Ca2Mg6Zn3) and the surrounding magnesium matrix. The bio-corrosion resistance of the alloy can be improved by heat treatment. The volume fraction of secondary phases and grain size are both key factors controlling the bio-corrosion rate of the alloy. The bio-corrosion rate increases with volume fraction of secondary phase. When this is lower than 0.8%, the dependence of bio-corrosion rate becomes noticeable: large grains corrode more quickly.

Author-supplied keywords

  • Degradation
  • Heat treatment
  • Mg-Zn-Ca
  • Microstructure

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Authors

  • Y. Lu

  • A. R. Bradshaw

  • Y. L. Chiu

  • I. P. Jones

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