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マグネタイト共存下における炭素鋼の腐食挙動に関する研究の現状と課題

Current status and future of studies on the corrosion of carbon steel in the presence of magnetite

柴田 俊夫*; 瀬尾 眞浩*; 杉本 克久*; 水流 徹*; 井上 博之*; 藤本 慎司*

Shibata, Toshio*; not registered; not registered; Tsuru, Toru*; Inoue, Hiroyuki*; not registered

炭素鋼オーバーパックの腐食寿命を評価するうえで、腐食生成物の堆積による影響を把握する必要がある。特に、炭素鋼の表面に模擬腐食生成物としてマグネタイトを付与すると、炭素鋼の腐食速度が増加するとの報告があり、炭素鋼オーバーパックの腐食寿命への影響が懸念されている。これまでに、マグネタイト共存下における炭素鋼の腐食機構の検討、腐食寿命への影響評価、腐食抑制方策の検討などが試みられているが、研究者によって必ずしも見解は一致していない。そこで、マグネタイト共存下での炭素鋼の腐食に関する既往の研究を基に、これまでの知見を整理するとともに、課題を抽出した。

It is essentially necessary to understand the effect of corrosion products on the corrosion rate of carbon steel in order to evaluate the lifetime of carbon steel overpack, Especially, effect of magnetite on the long term integrity of overpack is one of the important subjects to be solved, because some experimental results showed that the magnetite layer formed on a carbon steel overpack as a corrosion product would accelerates the corrosion rate of the overpack. Various studies have been conducted on the corrosion mechanism of carbon steel in the presence of magnetite, its effect on the overpack lifetime and the countermeasures against the corrosion acceleration. At present, however, the interpretations on the results of these studies are not always consistent each other. In this report, the current status of the studies on corrosion of carbon steel in the presence of magnetite was reviewed, and the unsolved problems and future research subjects were extracted and discussed.

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