耐候性鋼上に生成した結晶性さびの組成と腐食速度との相関

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タイトル別名
  • Correlation between Corrosion Rate and Composition of Crystalline Corrosion Products Formed on Weathering Steels
  • タイコウセイ コウ ジョウ ニ セイセイ シタ ケッショウセイサビ ノ ソセイ ト フショク ソクド ト ノ ソウカン

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The correlation between corrosion rate and compositions of crystalline corrosion products formed on weathering steels exposed to different amount of air-borne sea salt particles has been investigated by the X-ray diffraction method. The mass ratio (α⁄γ) of crystalline α-FeOOH to γ-FeOOH, in the rust formed on the weathering steels exposed at an industrial environment increases with an increase in exposure duration. The ratio α⁄γ is closely related to the corrosion rate in environments when the amount of air-borne salt is less than 0.2 mg NaCl/dm2/day. However this is not the case in seaside environments with higher amount of air-borne salts. The mass ratio (α⁄γ*) of crystalline α-FeOOH to the total mass of γ-FeOOH, β-FeOOH and Fe3O4, in the rust formed on the weathering steels is related to the corrosion rate even in seaside environments certainly more than 0.2 mg/dm2/day of air-borne sea salt particles. When the ratio α⁄γ* is more than 1, the higher corrosion rate more than 0.01 mm/y is not observed. The ratio α⁄γ* is expected to be an index for evaluating the corrosion resistance of the weathering steels even in atmosphere containing higher salt content.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 65 (10), 922-928, 2001

    公益社団法人 日本金属学会

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