The corrosion behaviour of sputter-deposited amorphous Mn-Ti alloys in 0.5 M NaCl solutions

A. A. El-Moneim, B. P. Zhang, E. Akiyama, H. Habazaki, A. Kawashima, K. Asami, K. Hashimoto

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Amorphous Mn-Ti alloys were successfully prepared by DC magnetron sputter-deposition in a wide composition range. Corrosion experiments and anodic potentiodynamic polarization measurements performed in 0.5 M NaCl at pH 5.5 and 11.5, open to air at 30°C, show improved the corrosion resistance of the alloys compared with manganese. Alloying of 12 at.% or more titanium to manganese was very effective in increasing the corrosion resistance in aerated alkaline solution containing chloride ions. X-ray photo-electron spectroscopic analysis of spontaneously passivated films formed in alkaline medium revealed that titanium ions were enriched in the passive films. The passive films formed on Mn-Ti alloys at pH 11.5 were composed of a homogeneous double oxyhydoxide of tetravalent titanium and divalent manganese. It is concluded that the presence of oxidized manganese and titanium in the form of a homogeneous double oxyhydroxide is responsible for the corrosion resistance of the Mn-Ti alloys.

Original languageEnglish
Pages (from-to)305-320
Number of pages16
JournalCorrosion Science
Volume39
Issue number2
DOIs
Publication statusPublished - 1997 Feb

Keywords

  • A. amorphous structures
  • B. potentiostatic
  • C. passive films

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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