Evaluating the corrosion behaviour of Magnesium alloy in simulated biological fluid by using SECM to detect hydrogen evolution

Journal Article


Abstract


  • Scanning electrochemical microscopy (SECM) in surface generation/tip collection mode is investigated as an assessment tool for studying the corrosion behaviour of magnesium in simulated biological fluid. The technique provides a local map of hydrogen (H2) evolution which alone can be used as a direct measure of corrosion. The H2 generated during corrosion of magnesium is oxidized at the probe(i.e. a Pt ultra micro-electrode);with the magnitude of the current generated due to oxidation being indicative of the intensity of H2 evolution at a local scale on the magnesium surface. This method was calibrated using a cathodically polarized Pt disk to simulate H2 evolution in a controlled condition on a homogeneous surface. Potential interference from dissolving Mg or high local pH was also investigated. The technique was implemented for studying H2 evolution at the surface of AZ31 as a model Mg alloy.SECM results combined with SEM-EDX and profilometry data revealed that local domains of higher H2 evolution on the surface of AZ31 are in close proximityof the observed pitting sites.

Authors


  •   Jamali , Sina S.
  •   Moulton, Simon E. (external author)
  •   Tallman, Dennis E. (external author)
  •   Forsyth, Maria (external author)
  •   Weber, Jan (external author)
  •   Wallace, Gordon G.

Publication Date


  • 2015

Citation


  • Jamali, S. S., Moulton, S. E., Tallman, D. E., Forsyth, M., Weber, J. & Wallace, G. G. (2015). Evaluating the corrosion behaviour of Magnesium alloy in simulated biological fluid by using SECM to detect hydrogen evolution. Electrochimica Acta, 152 294-301.

Scopus Eid


  • 2-s2.0-84913554132

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1452

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 294

End Page


  • 301

Volume


  • 152

Place Of Publication


  • United Kingdom

Abstract


  • Scanning electrochemical microscopy (SECM) in surface generation/tip collection mode is investigated as an assessment tool for studying the corrosion behaviour of magnesium in simulated biological fluid. The technique provides a local map of hydrogen (H2) evolution which alone can be used as a direct measure of corrosion. The H2 generated during corrosion of magnesium is oxidized at the probe(i.e. a Pt ultra micro-electrode);with the magnitude of the current generated due to oxidation being indicative of the intensity of H2 evolution at a local scale on the magnesium surface. This method was calibrated using a cathodically polarized Pt disk to simulate H2 evolution in a controlled condition on a homogeneous surface. Potential interference from dissolving Mg or high local pH was also investigated. The technique was implemented for studying H2 evolution at the surface of AZ31 as a model Mg alloy.SECM results combined with SEM-EDX and profilometry data revealed that local domains of higher H2 evolution on the surface of AZ31 are in close proximityof the observed pitting sites.

Authors


  •   Jamali , Sina S.
  •   Moulton, Simon E. (external author)
  •   Tallman, Dennis E. (external author)
  •   Forsyth, Maria (external author)
  •   Weber, Jan (external author)
  •   Wallace, Gordon G.

Publication Date


  • 2015

Citation


  • Jamali, S. S., Moulton, S. E., Tallman, D. E., Forsyth, M., Weber, J. & Wallace, G. G. (2015). Evaluating the corrosion behaviour of Magnesium alloy in simulated biological fluid by using SECM to detect hydrogen evolution. Electrochimica Acta, 152 294-301.

Scopus Eid


  • 2-s2.0-84913554132

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1452

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 294

End Page


  • 301

Volume


  • 152

Place Of Publication


  • United Kingdom