The influence of chromium and molybdenum on the repassivation of nickel-chromium-molybdenum alloys in saline solutions
The influence of chromium and molybdenum on the repassivation of nickel-chromium-molybdenum alloys in saline solutions
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DOI：
10.1002/sia.6254
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发表时间：
2017-12-01
影响因子：
1.7
通讯作者：
Noel, J. J.
中科院分区：
文献类型：
--
作者：
Ebrahimi, N.;Biesinger, M. C.;Noel, J. J.
在 5.0M NaCl 溶液中研究了 Ni-Cr-Mo 合金 C22（高 Cr/低 Mo）和 HYBRID BC1（低 Cr/高 Mo）上钝态、跨钝态和再形成钝态氧化物的电化学性能和成分。在无源区的低电势下，与 C22 相比，BC1 上的氧化物电阻较小，这可能是由于 Mo 增加了氧化物中缺陷数量的影响。在钝化区的较高电势下，两种合金表现出相似的行为和氧化膜成分。在钝化条件下，两种合金上的 Cr-III 阻挡层（主要是 Cr2O3）都被破坏，BC1 上的 Mo-VI/Mo-V 积累量比 C22 合金上的更多。当两种合金恢复到钝化区的电势时，钝化性都得到了改善。这似乎主要是由于 C22 上 Cr-III 阻挡氧化物层的重新形成，但也是该层的重新形成和 BC1 上 Mo-VI/Mo-V 积累的结合。版权所有 (c) 2017 约翰·威利父子有限公司
The electrochemical properties and compositions of passive, transpassive, and re-formed passive oxides on the Ni-Cr-Mo alloys C22 (high Cr/low Mo) and HYBRID BC1 (low Cr/high Mo) have been studied in 5.0M NaCl solutions. At low potentials in the passive region, the oxide was less resistive on BC1 compared to C22, possibly due to the influence of Mo in increasing the number of defects in the oxide. At higher potentials in the passive region, both alloys exhibited similar behaviours and composition of oxide films. Under transpassive conditions, the Cr-III barrier layer (dominantly Cr2O3) was destroyed on both alloys, with a greater accumulation of Mo-VI/Mo-V on the BC1 than on the C22 alloy. Improved passivity was achieved for both alloys on returning to potentials in the passive region. This appears to be due mainly to the re-formation of the Cr-III barrier oxide layer on C22, but to a combination of the reformation of this layer and the accumulation of Mo-VI/Mo-V on the BC1. Copyright (c) 2017 John Wiley & Sons, Ltd.