Experimental and numerical investigations of Ni–Co–SiO2 alloy films deposited by magnetic-field-assisted jet plating
Experimental and numerical investigations of Ni–Co–SiO2 alloy films deposited by magnetic-field-assisted jet plating
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DOI：
10.1016/j.surfcoat.2021.127583
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发表时间：
2021-10
影响因子：
5.4
通讯作者：
Wei Jiang;Mengyuan Huang;Yuanxia Lao;Xuegeng Yang;Changan Wang;Z. Tian;Shengqiang Zhou;G. Mutschke;K. Eckert
中科院分区：
文献类型：
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作者：
Wei Jiang;Mengyuan Huang;Yuanxia Lao;Xuegeng Yang;Changan Wang;Z. Tian;Shengqiang Zhou;G. Mutschke;K. Eckert
提出了一种磁场辅助喷射镀Ni-Co-SiO2合金薄膜的新方法。研究了电解液中不同浓度的Co 2+离子在磁场和无磁场条件下对镀层性能的影响。对合金膜的织构取向、表面形貌、磁性能和耐蚀性进行了表征。结果表明，随着常规喷射镀中Co2+浓度的增加，当Co2+浓度为30 g/L时，由于Co2+含量较高时，镀层表面形成六方密堆积结构，由粒状晶体结构转变为针状结构。在磁场的辅助下，薄膜中的Co含量降低，即使在Co2+浓度为30 g/L的情况下也是如此。存款层保持在面心立方（FCC）结构，并显示出粒状形态。磁场一般导致晶粒细化，抑制异常Ni-Co共沉积。磁场辅助喷射镀Ni-Co-SiO2合金薄膜表面光滑致密。当Co2+浓度为20 g/L时，合金的软磁性能和耐蚀性最好。室温下，在3.5wt%NaCl溶液中，无搅拌条件下，磁电阻率低至7.5 Oe，腐蚀电流密度低至1.12 μA·cm− 2，显示了该方法制备上级软磁材料的优越性。建立了磁场辅助喷射镀的物理模型。通过数值模拟分析了磁场对沉积过程的影响，并从磁流体力学的角度讨论了磁场对沉积过程的影响。
A new method of magnetic-field-assisted jet plating is presented to manufacture Ni-Co-SiO2alloy films. The influence of different concentrations of Co2+ions of the electrolyte is investigated with and without magnetic field to study the resulting properties of the deposits. The texture orientation, surface morphology, magnetic properties and corrosion resistance of the alloy films were characterized. The results show that with increasing Co2+concentration in conventional jet-plating, the surface morphology changes from a granular crystal structure to a needle-like structure at 30 g/L caused by the hexagonal close-packed (HCP) structure of a large Co content. Differently, the assistance of the magnetic field leads to lower Co content in the films, even at a high Co2+concentration of 30 g/L. The deposit layer remains in the face-centered cubic (FCC) structure and shows a granular morphology. The magnetic field in general leads to grain refinement and inhibits the abnormal Ni-Co co-deposition. The Ni–Co–SiO2alloy films obtained by magnetic-field-assisted jet plating have a smooth and dense surface. The best soft magnetic properties and corrosion resistance are obtained at a Co2+concentration of 20 g/L. The coercivity is as low as 7.5 Oe, and the corrosion current density is as low as 1.12 μA·cm−2in 3.5 wt% NaCl solution without agitation and at room temperature, clearly showing the advantages of the method for preparing superior soft magnetic materials. In addition, a physical model of magnetic-field-assisted jet plating is established. The magnetic forces and the resulting electrolyte flow are analyzed with the help of numerical simulations, and the influence of the magnetic field on the deposition process is discussed from the perspective of magnetohydrodynamics.