Inhibition of hydrogen embrittlement of Ni-Ti superelastic alloy in acid fluoride solution by hydrogen peroxide addition

Ken'Ichi Yokoyama, Yushin Yazaki, Jun'Ichi Sakai

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Inhibition of the hydrogen embrittlement of Ni-Ti superelastic alloy in an acidulated phosphate fluoride (APF) solution has been attempted by adding various amounts of H2O2. In a 0.2% APF solution, hydrogen absorption is markedly inhibited by adding H2O2, although corrosion is slightly enhanced by increasing the amount of added H 2O2. By adding a small amount of H2O 2 (0.001M), in the early stage of immersion, hydrogen embrittlement is inhibited and corrosion is only slightly enhanced. Upon adding H 2O2, it appears that the dominant cathodic reactions change from hydrogen evolution to H2O2 reduction reactions, or the surface conditions of the alloy are changed by H 2O2 with a high oxidation capability, thereby inhibiting hydrogen absorption. The present study clearly indicates that infinitesimal addition of H2O2 into acid fluoride solutions is effective for the inhibition of the hydrogen embrittlement of the alloy.

    Original languageEnglish
    Pages (from-to)404-411
    Number of pages8
    JournalJournal of Biomedical Materials Research - Part A
    Volume98 A
    Issue number3
    DOIs
    Publication statusPublished - 2011 Sep 1

    Keywords

    • corrosion
    • fluoride
    • hydrogen embrittlement
    • nitinol
    • shape memory alloy

    ASJC Scopus subject areas

    • Biomedical Engineering
    • Biomaterials
    • Ceramics and Composites
    • Metals and Alloys

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