Aluminum corrosion in deaerated pure water

Katsuya Ishii, Ryota Ozaki, Kenji Kaneko, Masataka Masuda

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    The Amount of aluminum corrosion was critically measured in deoxidized pure water. It was indirectly calculated from the pressure of the hydrogen gas produced by the cathodic reaction. The accuracy of this device reached as high as 0.1 mg/m 2. The corrosion rate of A1N99 (99.99% aluminum) was then examined and compared with the images taken by both scanning electron microscope (SEM) and transmission electron microscope (TEM). In particular, images of the surface were taken by SEM and that of the cross section by TEM. From these comparisons, a new corrosion mechanism was proposed; 1) aluminum corrosion starts by the formation of small pits with a diameter of about 0.1 μm, 2) the number of these small pits increases and spreads over the entire surface. In addition, there is a time-lag between the increase of hydrogen gas pressure and the formation of corrosion products on the surface. The most likely reason for this time lag is that the Al ions require a long period of time to form stable oxide films.

    Original languageEnglish
    Pages (from-to)82-87
    Number of pages6
    JournalKeikinzoku/Journal of Japan Institute of Light Metals
    Volume56
    Issue number2
    DOIs
    Publication statusPublished - Feb 2006

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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