Corrosion Behavior of Stainless Steel in High Temperature Concentrated LiBr/LiNO3/KCl Mixed Solution

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  • 高温高濃度ＬｉＢｒ／ＬｉＮＯ３／ＫＣｌ混合水溶液中における各種ステンレス鋼の腐食挙動
  • コウオン コウノウド LiBr LiNO3 KCl コンゴウ スイヨウエキチュウ ニ オケル カクシュ ステンレスコウ ノ フショク キョドウ

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Abstract

Corrosion of SUS304, SUS316L and SUS430 stainless steel has been investigated for 200 h in concentrated aqueous solution of mixed LiBr-LiNO3-KCl-LiOH salts at elevated temperature as a function of temperature. The structure and composition of the surface films were analyzed by XRD and XPS. These stainless steels were passivated in the solution up to 463 K, and localized corrosion as pits was not observed. At 383 K, oxide films (without very thin passive film) of these stainless steels were hardly formed. However, the amount of oxide film (WF) increased with temperature. By addition of Li2MoO4, WF of SUS304 and SUS430 stainless steels increased at 463 K , while the amount of metals dissolved into the solution (WD) did not depend on the addition of Li2MoO4. WF and WD of SUS316L did not depend on the addition of Li2MoO4. Outermost parts of oxide film on the stainless steels were mainly composed of γ-Fe2O3. The role of surface film-γ-Fe2O3 in the corrosion behavior was discussed in terms of repair function of the imperfections in the film.

Journal

  • Zairyo-to-Kankyo

    Zairyo-to-Kankyo 57 (6), 274-281, 2008

    Japan Society of Corrosion Engineering

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