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| 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) |
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Cite this article:
Zuo Jingyi Jin Zhiqiang (Beijing Institute of chemical Technology). 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.
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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.
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Received: 25 April 1988
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