Influence of Zirconia Incorporation on the Mechanical and Chemical Properties of Ni-Co Alloys

American Journal of Materials Science Pub Date : 2012-08-31 DOI:10.5923/J.MATERIALS.20110102.19

M. Sri̇vastava, A. Srinivasan, V. W. Grips

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引用次数: 32

Abstract

Ni-Co-ZrO2 nano-composites are electrodeposited from sulphamate electrolyte and a comparison is made with Ni-ZrO2 in terms of structure and properties. The Co content in the coatings is in the range of 10-80wt%. The deposition conditions like current density, pH are optimized in terms of microhardness and amounts of ZrO2 incorporated. The micro-hardness studies revealed that the maximum hardness is exhibited by Ni-28Co-2ZrO2 composite. The FESEM study showed a change in morphology from polyhedral to ridge with increase in Co content from 10 to 80wt%. A change in crystal structure from fcc to hcp is also seen. The effect of annealing treatment in terms of microhardness is studied by subjecting the com-posite electroforms to 800℃. The Co rich composite exhibited better stability compared to Ni rich composites. Ni-28Co-2ZrO2 composite exhibited better immersion corrosion resistance while, Ni-ZrO2 composite displayed better elec-trochemical corrosion resistance. The wear studies showed that Ni-10Co-2ZrO2, Ni-28Co-2ZrO2 composites showed better resistance. Thus, it is seen that the coatings can be tailored to suit various applications.

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氧化锆掺入对Ni-Co合金力学和化学性能的影响

以氨基磺酸盐为电解液，电沉积了Ni-Co-ZrO2纳米复合材料，并与Ni-ZrO2在结构和性能上进行了比较。涂层中的Co含量在10-80wt%之间。从显微硬度和ZrO2掺入量等方面对电流密度、pH等沉积条件进行了优化。显微硬度研究表明，Ni-28Co-2ZrO2复合材料的硬度最高。FESEM研究表明，随着Co含量从10%增加到80wt%，其形貌从多面体转变为脊状。从fcc到hcp的晶体结构也发生了变化。将复合电铸件置于800℃高温下，研究了退火处理对显微硬度的影响。富Co复合材料的稳定性优于富Ni复合材料。Ni-28Co-2ZrO2复合材料具有较好的耐浸没腐蚀性能，而Ni-ZrO2复合材料具有较好的耐电化学腐蚀性能。磨损研究表明，Ni-10Co-2ZrO2、Ni-28Co-2ZrO2复合材料具有较好的耐磨性。因此，可以看到涂层可以定制以适应各种应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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American Journal of Materials Science

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