Polarization behavior of pure magnesium under a controlled flow in a NaCl solution

Sachiko Hiromoto, Akiko Yamamoto, Norio Maruyama, Hidetoshi Somekawa, Toshiji Mukai

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Magnesium and its alloys are potential candidates for bioabsorbable stents. The degradation rate of an indwelled magnesium stent is expected to be controlled under a blood flow. The influence of the controlled flow on the polarization and impedance behavior of pure Mg was thus investigated in a 0.6 mass% NaCl solution using a rotating electrode. The existence of a flow caused an increase in the anodic current density as well as a decrease in the impedance for a few hours of immersion, indicating the acceleration of Mg dissolution and the retardation of the growth of the surface hydroxide film. Interestingly, the existence of a flow retarded the breakdown of the surface film. After the surface film was broken down, the impedance did not depend on the rotation speed. To precisely evaluate the degradation rate of magnesium and its alloys for use in stents, the flow rate of the test solution should be controlled.

Original languageEnglish
Pages (from-to)1456-1461
Number of pages6
JournalMaterials Transactions
Volume49
Issue number6
DOIs
Publication statusPublished - 2008 Jun
Externally publishedYes

Keywords

  • Biomaterial
  • Controlled flow
  • Impedance behavior
  • Polarization behavior
  • Pure magnesium

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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