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首页> 外文期刊>International Journal of Electrochemical Science >Fabrication of Nanocrystalline Ni–Co Coatings by Electrodeposition under Supergravity Field
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Fabrication of Nanocrystalline Ni–Co Coatings by Electrodeposition under Supergravity Field

机译：超重力场下电沉积法制备纳米晶Ni-Co涂层

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Ni–Co coatings on stainless steel substrates are prepared using electrodeposition assisted by asupergravity field. Transmission electron microscopy reveals the nanometer-scale grain size of the as-prepared Ni–Co coatings, confined to around 15 nm, to have likely been due to crystal formation andgrowth under supergravity conditions. In comparison, electrodeposited coatings obtained under normalgravity without the addition of saccharin exhibit a much larger grain size. Energy dispersivespectroscopy analysis clearly shows a Co content of 40.56 wt.% in the Ni–Co coatings after havingused a Co bath concentration of 40 g/l, which cannot be achieved under normal gravity. A maximummicrohardness of 660 HV is obtained, also unachievable under normal gravity. Moreover, Ni–Cocoatings produced under supergravity show increased resistance to wear compared with their normal-gravity counterparts. We conclude that the high quality inherent to the nanocrystalline Ni–Co coatingsoriginates from the improved crystallinity and increased Co content arising from the use ofsupergravity.
机译：不锈钢基材上的Ni-Co涂层是通过超重力场辅助的电沉积制备的。透射电子显微镜显示，所制备的Ni-Co涂层的纳米级晶粒尺寸被限制在15 nm左右，这很可能是由于超重力条件下晶体的形成和生长所致。相比之下，在不添加糖精的情况下在正常重力下获得的电沉积涂层具有更大的晶粒尺寸。能量色散光谱分析清楚地表明，在使用40 g / l的Co浴浓度后，Ni-Co涂层中的Co含量为40.56 wt。％，这是在正常重力下无法实现的。获得的最大显微硬度为660 HV，在正常重力下也无法实现。而且，与常规重力相比，在超重力作用下生产的镍钴合金涂层显示出更高的耐磨性。我们得出的结论是，纳米晶体Ni-Co涂层固有的高质量源自使用超重力而导致的结晶度提高和Co含量增加。

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