The effect of magnetic fields on the electrodeposition of cobalt
The effect of magnetic fields on the electrodeposition of cobalt
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DOI：
10.1016/j.electacta.2004.04.006
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发表时间：
2004-09
影响因子：
6.6
通讯作者：
A. Krause;M. Uhlemann;A. Gebert;L. Schultz
中科院分区：
文献类型：
--
作者：
A. Krause;M. Uhlemann;A. Gebert;L. Schultz
从磁场(B)的强度和取向两个方面研究了磁场对电沉积钴的影响。观察到磁场B对钴的电沉积有两种不同的影响。第一种是由洛伦兹力引起的磁流体效应(F→L)。第二种是由浓度梯度(→c)和摩尔磁化率梯度(∇→m)引起的顺磁力(F∇→χp)的影响。当B场平行于电极表面时，Co的极限电流密度和沉积速率增大。这主要是由于F→L引起的预期对流，Co的沉积和氢离子的还原都受此影响。在较高的阴极电位下，氢还原对过程的贡献发生了变化，导致了均匀的沉积。测量了平行于或反平行于离子流方向的B场沉积速率的下降。这些结果归因于F→Pn对靠近表面的电化学过程的影响。
The effect of a magnetic field on the electrodeposition of Co has been investigated with respect to the strength and the orientation of the magnetic field (B). Two different effects of the magnetic field B on the electrodeposition of cobalt have been observed. The first is the magnetohydrodynamic (MHD) effect caused by the Lorentz force (F →L). The second is an effect due to the paramagnetic force (F →p), caused by the concentration gradient (∇ → c ) and therefore the gradient of the molar susceptibility (∇ → χm). The limiting current density and the deposition rate of Co increases if the B-field is oriented parallel to the electrode surface. This is mainly due to the expected convection induced by F →L. Both, the Co deposition and the reduction of hydrogen ions, are affected by this. At high cathodic potentials the contribution of the hydrogen reduction to the process changed, which led to homogeneous deposits. A decreasing deposition rate was measured for B-fields oriented parallel or antiparallel to the flow of ions. These results are attributed to the effect of F →pon the electrochemical processes close to the surface.