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MICROHARDNESS OF Ni-Co ALLOY PLATED BY HIGH FREQUENCY PULSE CURRENTS |
XU Yunhua1;CAO Kening2;YANG Yuguo1;ZHAO Yu1; GONG Xiaojing1 |
1.School of Sciences; Beijing Jiaotong University; Beijing 100044
2.Beijing Spacecrafts; Beijing 100081 |
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Abstract Ni-Co alloys were deposited by applying current pulses from a sulfate electrolyte. The effect of the ionic concentration of cobalt in the electrolyte and pulse parameters on the cobalt content in the deposits and the microhardness of the deposits were studied. The morphologies and metallic phases of the alloys were analysed by scanning electron microscope(SEM) and X-ray diffraction(XRD). The results indicated that the cobalt content in alloy deposits had a strong effect on its hardness, and the increase of cobalt content resulted in increasing of the hardness of the deposits. At low cobalt content, pure face centered cubic (fcc) structure was identified.
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Received: 02 July 2007
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Corresponding Authors:
XU Yunhua
E-mail: yhxu@bjtu.edu.cn
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