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| THE EFFECT OF HEAT TREATMENT ON THE PASSIVE PROPERTY OF MARAGING STAINLESS STEEL |
| Wang Wei Song Shizhe and Wang Jinfeng (Tionjin University) |
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Abstract The passive property of new type maraging stainless steel 0 Crl2Ni5MnMoCuAlTiREB is researched in the passive state formation, the stability, and localized damage of passive film by means of various electrochemical detection methods and TEM. The results show that the passive pioperty of the steel in solid solution state is not so good and it can be improved by short time aging. After a long time aging, the passive property will gradually lower again because of the precipitation of intermetallic compound. Optimum stability of passive film is obtained with proper heat treatment, but the critical passive current density i. is larger. Deformation in solid solution state decreases the stability of passive film formed on aged steel, but hardly affects the pitting breakdown potential φ_b.
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Received: 25 June 1989
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