Corrosion rate of carbon steel in NaCl solution with various chloride ion concentration under -ray irradiation

線照射時のNaCl水溶液における炭素鋼の腐食速度

本岡 隆文

Motooka, Takafumi

低線量率条件での塩化物水溶液中の炭素鋼の腐食速度について、塩化物イオン濃度の異なる水溶液を用いて腐食試験により調べた。500Gy/hの線量率では、炭素鋼の腐食速度はある濃度で極大となった。塩化物水溶液中の放射線分解で生成した酸化性物質が炭素鋼の腐食を加速した。腐食速度と塩化物濃度の対応と酸化性物質濃度と塩化物濃度の対応との間に相関性が認められた。

Corrosion rates of carbon steel in chloride aqueous solutions under a low dose rate were investigated by corrosion test using chloride aqueous solutions with different chloride concentrations. The corrosion rate of carbon steel had the maximum value at a certain concentration at a dose rate of 500Gy/h. The oxidants produced by radiolysis of chloride aqueous solution enhanced the corrosion of carbon steel. The dependence of corrosion rate and chloride concentration has a positive correlation with the dependence of oxidant concentration and chloride concentration.