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再処理施設における経年変化研究,4; ホルマリンによる脱硝条件下でのステンレス鋼の腐食挙動

Study on ageing behavior of reprocessing plants, 4; Corrosion behavior of stainless steel under denitration with formaldehyde

本岡 隆文; 上野 文義  ; 山本 正弘 ; 内山 軍蔵 ; 野島 康夫*; 藤根 幸雄*

Motooka, Takafumi; Ueno, Fumiyoshi; Yamamoto, Masahiro; Uchiyama, Gunzo; Nojima, Yasuo*; Fujine, Sachio*

ホルマリンによる脱硝条件下でのステンレス鋼の腐食挙動を腐食試験等により調査した。その結果、ホルマリンによる脱硝反応に伴う硝酸濃度の低下とNOxガスの発生を認めた。ステンレス鋼の腐食速度はホルマリンの注入により大きく低下した。腐食速度低下の要因はNOxガスと亜硝酸と考えられた。

The corrosion behavior of stainless steels under denitration condition with formaldehyde was investigated by the corrosion test etc. As a result, the decrease in nitric acid concentration and the generation of NOx gas were observed under the denitration. The corrosion rate of stainless steels has decreased greatly by the injection of formaldehyde. It was thought that NOx and nitrous acid were factors for decrease of corrosion rate in a stainless steel.

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