用模拟闭塞电池研究1Cr18Ni9Ti奥氏体不锈钢在Cl~-+NO_3~-(或NO_2~-)溶液中闭塞区内化学和电化学状态的变化。当外部溶液中NO_3~-或NO_2~-达到一定浓度时,闭塞区内pH下降比在单纯Cl~-溶液中缓慢,并且趋于一极限值(pH(?)2)后,即不再下降。裂尖溶液内Cl~-与NO_3~-克当量比例和外部主溶液接近,但裂尖溶液变浓直到饱和。当1法拉第电量通过闭塞区时,大约有0.5～0.7克当量的Cl~-+NO_3~-迁入闭塞区。NO_2~-迁入裂尖后与H~+和金属离子反应而消耗。溶液中加入不同浓度NO_3~-或NO_2~-后,使破裂电位变为更正_1裂尖处于钝态,表明NO_3~-和NO_2~-均有缓蚀作用。
A simulated occluded cell was used to study the changes within crevices or cracks of Cr18Ni9 austenitic stainless steel in Cl~-+NO_3~-(or NO_2~-)solution. It was found that in the occluded cell pH dropped more slowly than in plain Cl~- solution and approached a limiting value at about2. The ratio of migration rate of Cl~- to NO_3~- in g-eq. was approximately the same as that of the concentrations of Cl-/NO_3~- in original solution. When 1F quantity of electricity passed, about 0.5～0.7 g-eq. of Cl~-+NO_3~- migrated into the occlude cell. Migration of NO_2~- was negligible. Addition of sufficient NO_3~- or NO_2~- also caused critical potential to move in the more positive direction and the crack tip s into the passive state.
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