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| A STUDY OF INHIBITION EFFECT AND ITS MECHANISM OF NO_3~-ON 0Cr18Ni9Ti STEEL OCCLUDED CELL IN 0.5M NaCl SOLUTION |
| Xu Chunchun; Liu Youping; Jin Zhiqiang and Zuo Jingyi (Beijing Institute of Chemical Technology) |
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Abstract Simulated occluded solutions were used to study inhibition effect and its mechanism of NO_3~!-on 0Crl8Ni9Ti occluded cell in 0.5M NaCl solution. It was found that the corrosion rate of 0Crl8Ni9Ti in occluded solution decreased and that the open-circuit potentials moved in the positive direction with increase of [NO_3~-]_(bulk). When [NO_3~-]_(bulk)≥0.025M(50℃) or [NO_3~-]_(bulk)≥0.2M(90℃),a state of active-passive transition occurred inside occluded cell. When [NO_3~-]_(bulk)≥0.3M(50℃)or[NO_3~-]_(bulk)0. 5M(90℃),the passivating effect was greatly improved, namely, the passive region becoming larger, the critical anodie current density for passivity and passive dissolution rate decreased. The inhibition efficiency inside O. C. was more than 90％at the above-stated NO_3~- concentration. The addition of sufficient NO_3~- cancause the steel in occluded cell to become passive, so that O. C. C. can be retarded.
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Received: 25 June 1991
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Cite this article:
Xu Chunchun; Liu Youping; Jin Zhiqiang and Zuo Jingyi (Beijing Institute of Chemical Technology). A STUDY OF INHIBITION EFFECT AND ITS MECHANISM OF NO_3~-ON 0Cr18Ni9Ti STEEL OCCLUDED CELL IN 0.5M NaCl SOLUTION. J Chin Soc Corr Pro, 1991, 11(3): 225-232.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1991/V11/I3/225
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[1] 左景伊,金志强,中国腐蚀与防护学报8(2) ,96(1988)
[2] Zuo,J. Y., Pourbaix, M., Xu, C. C., Liu, Y. P., Corrosion Science,29(5) ,557(1989)
[3] #12 |
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