著者

佐々木 英次 中原 東郎 神田 幸雄 大里 一夫 栂野 秀夫

出版者

社団法人 腐食防食協会

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.26, no.3, pp.125-132, 1977

被引用文献数

2

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The corrosion behavior of mild steel was investigated in a culture where hydrogen gas was bubbled. A dual cell system was employed. That is, in the first cell the bacteria produced hydrogen sulfide, which was introduced into the second cell by hydrogen gas. The bacteria were cultured in autotrophic or heterotrophic conditions. The electrode potential and polarization resistance of the specimens in both of the cells were measured. The variations of electrode potential and corrosion rate of the steel in both of the cell could be explained, corresponding to the variation of the concentration of hydrogen sulfide. The weight loss of the steel in the first cell was smaller than that in the second cell. There was no evidence that hydrogen depolarization by the bacteria occured. It seems to be more resonable that the anodic and catholic reactions were stimulated catalytically by hydrogen sulfide, not by the bacteria. On the other hand, in autotrophic condition, the bacteria could not grow so much, and the amount of biogenic hydrogen sulfide was much smaller than that in heterotrophic condition. Organic substances is necessary for the biosynthesis of the bacteria and for the great evolution of hydrogen sulfide. Therefore, in order to prevent the corrosion by the bacteria, in practice, a desalting plant ought to be designed to eliminate organic substances as much as possible.