Corrosion of Carbon steel in Tap Water （Ⅰ）New Corrosion Index Based on Water Quality

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  • 水道水環境における炭素鋼の腐食（Ⅰ）新しい水質指標を用いた腐食性評価方法
  • 水道水環境における炭素鋼の腐食(1)新しい水質指標を用いた腐食性評価方法
  • スイドウスイ カンキョウ ニ オケル タンソコウ ノ フショク(1)アタラシイ スイシツ シヒョウ オ モチイタ フショクセイ ヒョウカ ホウホウ

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Abstract

<p>A new method to evaluate the corrosivity of tap water to carbon steel has been proposed. Corrosion tests for the tap waters sampled at 49 locations throughout Japan were conducted. Average corrosion rate vw and maximum one vmax were measured. Relatively close relationship of vw and vmax to concentration of SiO2 and SO42－ were found. On the other hand, the corrosion rates showed slight dependence on concentrations of Cl－ and HCO3－. These facts are contradictory to the conventional knowledge. Furthermore, the authors surmised that [SO42－]/[SiO2], named SS ratio, was an effective Corrosion Index. SS ratio showed closer relationship to vw and vmax than Langelier Index, Ryznar Stability Index and Larson-Skold Index. The authors succeeded in expressing vw and vmax as a function of only SS ratio.</p>

Journal

  • Zairyo-to-Kankyo

    Zairyo-to-Kankyo 69 (10), 271-276, 2020-10-10

    Japan Society of Corrosion Engineering

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