在Cl~-体系中加入NO_3~-或NO_2~-对奥氏体不锈钢裂缝内化学状态的影响

中国腐蚀与防护学报

1988, Vol. 8

Issue (2): 96-104

研究报告

本期目录 | 过刊浏览

在Cl~-体系中加入NO_3~-或NO_2~-对奥氏体不锈钢裂缝内化学状态的影响

左景伊;金志强

北京化工学院;北京化工学院

THE EFFECT OF ADDITION OF NO_3~- OR NO_2~- IN Cl~- CONTAINING SOLUTION ON CHEMICAL CONDITION WITHIN CRACKS OF AUSTENITIC STAINLESS STEEL

Zuo Jingyi Jin Zhiqiang (Beijing Institute of chemical Technology)

全文: PDF(758 KB)

摘要: 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。

Abstract：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.

收稿日期: 1988-04-25

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左景伊;金志强. 在Cl~-体系中加入NO_3~-或NO_2~-对奥氏体不锈钢裂缝内化学状态的影响[J]. 中国腐蚀与防护学报, 1988, 8(2): 96-104.
. THE EFFECT OF ADDITION OF NO_3~- OR NO_2~- IN Cl~- CONTAINING SOLUTION ON CHEMICAL CONDITION WITHIN CRACKS OF AUSTENITIC STAINLESS STEEL. J Chin Soc Corr Pro, 1988, 8(2): 96-104.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1988/V8/I2/96

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[7] 左景伊,金志强,孙汝宏,徐玉宝,冯兴奎,在蚀孔、缝隙或应力腐蚀裂缝中的闭塞电池腐蚀的加速效应和临界pH值,参加第十届国际金属腐蚀会议论文(Madras,Nov.1987)
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