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首页> 外文期刊>Applied Surface Science >Electrodeposition of nanocrystalline Zn/Ni multilayer coatings from single bath: Influences of deposition current densities and number of layers on characteristics of deposits
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Electrodeposition of nanocrystalline Zn/Ni multilayer coatings from single bath: Influences of deposition current densities and number of layers on characteristics of deposits

机译：单槽电沉积纳米晶Zn / Ni多层涂层的电沉积：沉积电流密度和层数对沉积物特性的影响

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摘要

Zn/Ni nanocrystalline multilayer coatings were electrodeposited using single bath method and switching current densities. Effect of deposition current densities (i(1) and i(2)) and number of layers (n) on composition, surface morphology and roughness, microhardness, phase structure and corrosion resistance of Zn/Ni multilayers were studied and compared with that of single layer. Analyzing and optimizing the influences of mentioned parameters on corrosion resistance of multilayers carried out through Response Surface Methodology. The model based on RSM results demonstrated that improvement in corrosion resistance due to increase in "difference of deposition current densities" was more effective in higher number of layers. Also, as the mentioned difference surpassed from a defintie value, the reduction trend of corrosion current density approximately stopped. The overall Ni content of the multilayer with least corrosion current was less than that of specimens with higher Ni content. Increase in number of layers could enhance the microhardness more than 50%. Also, layering leaded to finer surface morphology as well as lower roughness. The interfaces in deposited multilayers comprised of same crystall structure (Ni2Zn11) but different composition and crystallite size. (C) 2017 Elsevier B.V. All rights reserved.
机译：Zn / Ni纳米晶多层涂层采用单浴法和开关电流密度进行电沉积。研究了沉积电流密度（i（1）和i（2））和层数（n）对Zn / Ni多层膜的组成，表面形态和粗糙度，显微硬度，相结构和耐蚀性的影响，并与之比较。单层。通过响应面法对上述参数对多层耐蚀性的影响进行分析和优化。基于RSM结果的模型表明，由于“沉积电流密度差异”的增加而导致的耐腐蚀性的提高在更高的层数上更为有效。另外，由于上述差超过规定值，因此腐蚀电流密度的降低趋势大致停止。具有最小腐蚀电流的多层的总镍含量小于具有较高镍含量的样品的总镍含量。层数的增加可以使显微硬度提高50％以上。而且，分层导致更精细的表面形态以及更低的粗糙度。沉积的多层中的界面由相同的晶体结构（Ni2Zn11）组成，但组成和微晶尺寸不同。 （C）2017 Elsevier B.V.保留所有权利。

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