Dental Materials
Volume 25, Issue 4 , Pages 467-472, April 2009

Corrosion mechanism of Ti–Cr alloys in solution containing fluoride

  • Shinji Takemoto

      Affiliations

    • Department of Dental Materials Science, Tokyo Dental College, Japan
    • Corresponding Author InformationCorresponding author at: 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan. Tel.: +81 43 270 3778; fax: +81 43 270 3780.
    • ,
  • Masayuki Hattori

      Affiliations

    • Department of Dental Materials Science, Tokyo Dental College, Japan
    • ,
  • Masao Yoshinari

      Affiliations

    • Department of Dental Materials Science, Tokyo Dental College, Japan
    • ,
  • Eiji Kawada

      Affiliations

    • Department of Dental Materials Science, Tokyo Dental College, Japan
    • ,
  • Katsuhiko Asami

      Affiliations

    • Institute for Materials Research, Tohoku University, Japan
    • ,
  • Yutaka Oda

      Affiliations

    • Department of Dental Materials Science, Tokyo Dental College, Japan

Received 28 December 2007; received in revised form 22 September 2008; accepted 25 September 2008.

Abstract 

Objective

The objective of this study was to clarify the influence of chromium content on surface reaction of Ti–Cr alloys in an acidic fluoride-containing saline solution.

Methods

Four Ti–Cr alloys containing 5, 10, 15 or 20mass% chromium were characterized in terms of dissolution of metals in an acidic fluoride-containing saline solution and surface structure by X-ray photoelectron spectroscopy and Auger electron spectroscopy.

Results

Total amount of metals dissolved from each alloy decreased with increase in chromium content. The surface oxide films of Ti–Cr alloys before and after immersion in an acidic fluoride-containing saline solution consisted of titanic and chromic species, such as oxide, hydroxide, and hydrate. The [Cr]/([Ti]+[Cr]) ratio in the surface oxide film on as-polished Ti–Cr alloys was closely correlated with chromium content. However, the ratio in any alloy approximately doubled after immersion. Although thick oxide films were observed after immersion, all alloys showed a thinner oxide film than commercially pure titanium.

Significant

In all alloys, concentration of chromic species such as oxide and hydroxide in the surface oxide film was associated with chromium content, and chromic species improved corrosion resistance to fluoride.

Keywords: Titanium alloy, Fluoride, Corrosion, X-ray photoelectron spectroscopy, Auger electron spectroscopy, Dissolution, Passive film, Corrosion resistance

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PII: S0109-5641(08)00247-9

doi:10.1016/j.dental.2008.09.005

Dental Materials
Volume 25, Issue 4 , Pages 467-472, April 2009

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