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首页> 外文期刊>Journal of engineering materials and technology >Effect of Ni and Zn Elements on the Microstructure and Antibacterial Properties of Cu Coatings
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Effect of Ni and Zn Elements on the Microstructure and Antibacterial Properties of Cu Coatings

机译：镍和锌元素对铜涂层组织和抗菌性能的影响

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摘要

In this work, 316L stainless steel samples were coated with copper (Cu) and German silver (Cu 17%Ni 10%Zn) to investigate the relation between their mechanical and antibacterial behaviors. The mechanical and material characteristics of the samples were studied by looking into the microstructure of the surface and the cross-section of the coatings, the surface roughness, and the adhesion strength between the coating layer and the substrate. The antibacterial behavior is then studied against gram-negative Escherichia coli and gram-positive Staphylococcus aureus. Two experiments were conducted to examine the antibacterial behavior. In the first experiment, the coated samples were covered with distilled water, whereas in the second experiment, the samples were tested without being covered with distilled water. The results show that German silver (Cu 17%Ni 10%Zn) had a higher antibacterial rate than copper (Cu) by around 10% for both gram-negative E. coli and gram-positive S. aureus. The reason is because a smoother surface is expected to limit the bacterial adhesion in most cases, and the German silver samples have a lower surface roughness (Ra) due to the higher thermal expansion value of zinc (Zn) compared with copper (Cu). A more in-depth look into the effect of various thickness of the coating with alloying elements (in this case nickel and zinc) on the antibacterial rate would be of great interest.
机译：在这项工作中，在316L不锈钢样品上涂了铜（Cu）和德国银（Cu 17％Ni 10％Zn），以研究它们的力学性能和抗菌性能之间的关系。通过研究表面的微观结构和涂层的横截面，表面粗糙度以及涂层与基材之间的粘合强度，研究了样品的机械和材料特性。然后研究革兰氏阴性大肠杆菌和革兰氏阳性金黄色葡萄球菌的抗菌行为。进行了两个实验以检验其抗菌性能。在第一个实验中，涂覆的样品用蒸馏水覆盖，而在第二个实验中，测试样品未用蒸馏水覆盖。结果表明，革兰氏阴性大肠杆菌和革兰氏阳性金黄色葡萄球菌的德国银（Cu 17％Ni 10％Zn）比铜（Cu）具有更高的抗菌率，约为10％。原因是，在大多数情况下，预期表面较光滑会限制细菌粘附，并且德国锌样品的表面粗糙度（Ra）较低，这是因为锌（Zn）的热膨胀值高于铜（Cu）。更加深入地研究具有合金元素（在这种情况下为镍和锌）的各种厚度的涂层对抗菌率的影响。

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