Hydrogen absorption and electrochemical properties of Mg 2-xNi (x=0-0.5) alloys prepared by bulk mechanical alloying

Toshiro Kuji, Hiroaki Nakano, Tatsuhiko Aizawa

Research output: Contribution to journalConference article

34 Citations (Scopus)

Abstract

Thermodynamic properties of hydrides of Mg 2-xNi alloys produced by bulk mechanical alloying were determined from the pressure-composition isotherms for absorption over the temperatures from 623 to 423 K. The van't Hoff plots for the plateau pressures of the isotherms clearly indicated the existence of high- and low-temperature hydrides with different entropy and enthalpy for hydride formation. The phase transition temperature was 525 K for Mg 2.0Ni and decreased with increasing value of x. Chemical and electrochemical behaviors of Mg 2-xNi alloys in an alkaline solution were precisely determined. It was found that hydrogen absorption in Mg 2-xNi alloys takes place by only immersing the alloys in 6 M KOH solution. On the other hand, during electrical charging hydrogen content increased with the quantity of charged electricity and reached the maximum value. However, the hydrogen content decreased afterwards because the corrosion of the alloys in the alkaline solution is significant.

Original languageEnglish
Pages (from-to)590-596
Number of pages7
JournalJournal of Alloys and Compounds
Volume330-332
DOIs
Publication statusPublished - 2002 Jan 17
EventProceedings of the International Symposium on Metal-Hydrogen (MH 2000) - Noosa Heads, QLD, Australia
Duration: 2000 Oct 12000 Oct 6

Keywords

  • Allotropic transformation
  • Bulk mechanical alloying
  • Hydrogen solubility
  • Mg-Ni alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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