Corrosion and hydrogen absorption of commercially pure zirconium in acid fluoride solutions

Ken'ichi Yokoyama, Daisuke Yamada, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The corrosion and hydrogen absorption of commercially pure zirconium have been investigated in acidulated phosphate fluoride (APF) solutions. Upon immersion in 2.0% APF solution of pH 5.0 at 25°C, a granular corrosion product (Na3ZrF7) deposits over the entire side surface of the specimen, thereby inhibiting further corrosion. In 0.2% APF solution, marked corrosion is observed from the early stage of immersion; no deposition of the corrosion product is observed by scanning electron microscopy. A substantial amount of hydrogen absorption is confirmed in both APF solutions by hydrogen thermal desorption analysis. The amount of absorbed hydrogen of the specimen immersed in the 2.0% APF solution is smaller than that in the 0.2% APF solution in the early stage of immersion. The hydrogen absorption behavior is not always consistent with the corrosion behavior. Hydrogen thermal desorption occurs in the temperature range of 300-700°C for the specimen without the corrosion product. Under the same immersion conditions, the amount of absorbed hydrogen in commercially pure zirconium is smaller than that in commercially pure titanium as reported previously. The present results suggest that commercially pure zirconium, compared with commercially pure titanium, is highly resistant to hydrogen absorption, although corrosion occurs in fluoride solutions.

    Original languageEnglish
    Pages (from-to)375-381
    Number of pages7
    JournalCorrosion Science
    Volume73
    DOIs
    Publication statusPublished - 2013 Aug

    Keywords

    • A. Zirconium
    • B. SEM
    • C. Acid corrosion
    • C. Hydrogen absorption
    • C. Hydrogen embrittlement

    ASJC Scopus subject areas

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

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