Analysis of effect of flow condition on NH 4HS corrosion

Kazuhiro Toba*, Toshimitsu Asotani, Koji Kawano, Jun'Ichi Sakai

*この研究の対応する著者

    研究成果査読

    抄録

    Effect of flow condition on NH 4HS corrosion was studied by analysis of a corroded elbow sample and computational simulation. The thickness of corrosion products film formed on the inner surface of the elbow was measured and chemical composition of the film was analyzed using EPMA (Electron Probe Micro Analysis). In addition, flow pattern prediction and CFD (Computational Fluid Dynamics) analyses were employed. The center of the outer radius of the elbow was preferentially corroded in the sampled elbow. The film on the outer radius of the elbow was thinner than the inner radius and contained less sulfur than the inner radius. Based on three CFD models, it was found that the liquid volume fraction increased in the center of the outer radius of the elbow. Thus, corroded area was consistent with the area of high liquid volume fraction. Furthermore, a calculated wall shear stress on the outer radius was much higher than the inner radius from CFD results. Therefore, it was concluded that a protective iron sulfide film could not be formed on the outer radius due to a high wall shear stress.

    本文言語English
    ページ(範囲)56-63
    ページ数8
    ジャーナルZairyo to Kankyo/ Corrosion Engineering
    61
    2
    DOI
    出版ステータスPublished - 2012

    ASJC Scopus subject areas

    • 電気化学
    • 材料化学
    • 金属および合金
    • 表面、皮膜および薄膜

    フィンガープリント

    「Analysis of effect of flow condition on NH <sub>4</sub>HS corrosion」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル