高温高濃度アルカリ溶液中での鉄の孔食

概要

論文の詳細を見る
The corrosion behaviors of iron, particularly the initiation and propagation of pits, in hot concentrated NaOH solutions saturated with NaCl have been studied by the electrochemical method and the dipping test. The anodic polarization characteristics of iron in concentrated caustic solutions are affected by the potential sweep rate, in such a way that the larger the sweep rate is, the larger the current density for maintaining passivation is. The data obtained by the steady-state potential step method are found to be most reliable. The threshold of potential for initiation of pitting was estimated as a function of the NaOH concentration. The results show that pitting can be initiated when the NaOH concentration is lower than 5M. On the other hand, pitting may not occur in the higher concentrated NaOH solutions saturated with NaCl, but the uniform corrosion of iron may take place in this case.
社団法人日本材料学会の論文
1975-04-15