Corrosion behavior of the Mg65Cu25Gd10 bulk amorphous alloys

F. X. Qin, G. T. Bae, Z. H. Dan, H. Lee, N. J. Kim

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The corrosion behavior of the Mg65Cu25Gd10 (numbers indicate at.%) bulk amorphous alloy as well as its crystalline counterpart and pure Mg investigated by electrochemical measurements. Potentiodynamic polarization tests and electrochemical impedance spectroscopy were carried out in 0.2 M borate buffer solution, 0.02 M NaCl solution and 0.1 M NaOH solution. Both amorphous and crystalline alloys were spontaneously passivated at significantly low passivation current density in borate buffer solution and sodium hydroxide solution. Surface morphology and composition information after polarization samples were characterized using scanning electron microscopy and energy disperse X-ray. Mg65Cu25Gd10 bulk amorphous alloy shows higher corrosion resistance than its crystalline counterpart due to the absence of the heterogeneities in the former On the other hand, in Cl- containing solution, both amorphous and crystalline alloys are active dissolved at high current density due the presence of aggressive Cl- ion in solution.

Original languageEnglish
Pages (from-to)636-639
Number of pages4
JournalMaterials Science and Engineering A
Volume449-451
DOIs
Publication statusPublished - 2007 Mar 25

Keywords

  • Bulk amorphous alloy
  • Corrosion
  • Electrochemical impedance
  • Magnesium
  • Passivation

ASJC Scopus subject areas

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

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