Relationship between concentration of hydrogen sulfide and corrosion rate of cast iron in sewer environment

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  • 下水道環境における硫化水素濃度と鋳鉄の腐食速度の関係
  • ゲスイドウ カンキョウ ニ オケル リュウカ スイソ ノウド ト チュウテツ ノ フショク ソクド ノ カンケイ

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Abstract

<p>　The back of manhole cover made of cast iron corrodes extremely in manholes where the concentration of hydrogen sulfide is high. In this study, the corrosion rate of cast iron as a function of the concentration of hydrogen sulfide has been derived. The mean annual concentrations of hydrogen sulfide in 12 manholes were obtained. Corrosion rates of specimens made of cast iron were calculated from mass loss of one‒year exposure in these manholes. The corrosion rate of the specimen increases with an increase in the mean annual concentration of hydrogen sulfide. The relation between logarithms of the two is nearly straight. Dew has acidic properties in manholes where the concentration of hydrogen sulfide is high, because sulfuric acid is produced from hydrogen sulfide. The output of the ACM (Atmospheric Corrosion Monitor) type corrosion sensor increases with increasing relative humidity in a manhole where the concentration of hydrogen sulfide is not detected.</p>

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