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MICROHARDNESS OF Ni-Co ALLOY PLATED BY HIGH FREQUENCY PULSE CURRENTS

Yunhua Xu

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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 indicatcd 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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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 indicatcd 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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Available 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 indicatcd 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.

Key concepts: Materials science, Cobalt, Alloy, Indentation hardness, Scanning electron microscope, Electrolyte, Metallurgy, Metal

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