On the Corrosion Protection of Aluminium Brass by Ferrous or Ferric Ion

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  • Sugawara Hideo
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Shimodaira Saburo
    The Research Institute for Iron, Steel and Other Metals, Tohoku University

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  • 汚染水によるアルミニウム黄銅の腐食に対する鉄イオンの防食作用について
  • オセンスイ ニ ヨル アルミニウム オウドウ ノ フショク ニ タイスル テツ イオン ノ ボウショク サヨウ ニ ツイテ

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The corrosion protection of aluminium brass by ferrous or ferric ion has been investigated in 3% NaCl aqueous solutions. Ferrous-sulphate, ferrous-chloride, ferric-sulphate or ferric-chloride were used. The concentration of ferrous or ferric ion was measured by the o-phenanthoroline method. The substances of surface films formed on aluminium brass were identified by means of diffuse reflection spectra and electron diffraction. The results obtained were as follows. <BR>(1) By the addition of 10∼100 ppm ferrous ion or 10 ppm ferric ion, the corrosion rates were markedly decreased and the concentration of chloride or sulphate ion had no appreciable effects on the corrosion rates. (2) In the case of containing hydrogen sulphide, the ferrous ion produced some non-stoichiometric compound and the corrosion rates of aluminium brass were considerably increased. (3) The surface films formed on aluminium brass consisted mainly of γ-FeOOH and the corrosion protictive action by the ferrous or ferric ion was due to the absorbed γ-FeOOH.

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