Effect of electrolyte temperature on composition and phase structure of nanocrystalline Fe–Ni alloys prepared by direct current electrodeposition
Effect of electrolyte temperature on composition and phase structure of nanocrystalline Fe–Ni alloys prepared by direct current electrodeposition
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DOI：
10.1016/j.surfcoat.2012.07.069
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发表时间：
2012-08
影响因子：
5.4
通讯作者：
Ting-Ruei Lee;L. Chang;C. Chen
中科院分区：
文献类型：
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作者：
Ting-Ruei Lee;L. Chang;C. Chen
利用电子探针和X射线衍射分析了在298、313、333和353 K四种电解液温度下直流电沉积Fe-Ni合金镀层的组成和相结构。随着电解液温度的升高，这种反常共沉积现象变得不那么明显，最终沉积转变为平衡状态，此时电解液的组成与353 K时的沉积组成大致相同。电解液温度对镀层的相结构有显著影响。在298 K时，沉积物的生成相与具有相同成分的淬火块体合金的生成相非常相似。另一方面，353 K沉积物含有类似于从高温缓慢冷却的块体合金的相。热力学平衡的极大增强归因于随着电解质温度的升高，吸附原子/单价中间体的表面迁移率增加。
Composition and phase structure were analyzed using electron microprobe and X-ray diffraction for a series of Fe–Ni deposits prepared by direct current electrodeposition at four electrolyte temperatures of 298, 313, 333 and 353K. The well-known anomalous codeposition became less significant with increasing electrolyte temperature, and the deposition eventually shifted to an equilibrium mode in which the electrolyte composition was approximately equal to the deposited one at 353K. The phase structures of the deposits were affected significantly by the electrolyte temperature. At 298K, the resultant phases of the deposits were very similar to those of the quenched bulk alloys with the same composition. On the other hand, the 353K deposits contained phases similar to those of the bulk alloys cooled slowly from high temperatures. The great enhancement of the thermodynamic equilibrium is attributed to the increase of the surface mobility of the adatoms/monovalent intermediates with increasing electrolyte temperature.