Relationship between hydrogen absorptionand corrosion behavior of Ti-6A1-4V alloy immersed in acidic fluoride solutions

Atsushi Fujita, Toshio Ogawa, Ken'ichi Yokoyama*, Jun'ichi Sakai

*この研究の対応する著者

    研究成果査読

    5 被引用数 (Scopus)

    抄録

    The relationship between hydrogen absorption and the corrosion behavior of Ti-6A1-4V alloy has been examined by immersing the alloy in acidulated phosphate fluoride (APF) solution with various concentrations. Upon immersion in 0.1 mass% APF solution, no hydrogen absorption is observed despite the occurrence of general corrosion. In 0.2% APF solution, slight hydrogen absorption occurs soon after immersion, and then the surface of the specimen becomes uniformly covered with a crystalline corrosion product (Na3AlF6), thereby inhibiting further hydrogen absorption. In APF solutions with concentrations higher than 0.4%, the amount of absorbed hydrogen increases with increasing concentration of APF solution and immersion time. The type and morphology of corrosion products sensitively depend on the concentration of APF solution. Upon immersion in 0.4% APF solution, crystalline and massive Na3AlF 6 are observed on the surface of the specimen. In 1.0% and 1.5% APF solutions, Na3AlF6 with a foldlike shape and granular Na3AlF6 and Na3TiF6 are observed. In 2.0% APF solution, only granularNa3TiF6is observed. The corrosion potentials and anodic polarization curves are analogous in all APF solutions except the 0.2% and 0.4% APF solutions. In contrast, the current density of cathodic polarization curves increases with the concentration of APF solution. The results of the present study suggest that the corrosion products play an important role in the hydrogen absorption behavior of Ti-6A1-4V alloy.

    本文言語English
    ページ(範囲)1183-1189
    ページ数7
    ジャーナルMaterials Transactions
    50
    5
    DOI
    出版ステータスPublished - 2009 5

    ASJC Scopus subject areas

    • 材料科学(全般)
    • 凝縮系物理学
    • 機械工学
    • 材料力学

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