• Title/Summary/Keyword: Ni-Fe-P electrodeposition

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The Effect of Grain Refiner on Ni-Fe-P Alloy Electrodeposition (Ni-Fe-P 합금전착에 미치는 Grain Refiner의 영향)

  • 서무홍;김동진;김정수
    • Journal of the Korean institute of surface engineering
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    • v.36 no.6
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    • pp.437-443
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    • 2003

  • The effects of additive(grain refiner, GR) on process efficiency of the Ni-Fe-P alloy electrodeposition and the material properties of the deposit were investigated. Electrochemical properties of the deposits were investigated using polarization and electrochemical impedance techniques, and the material properties of the deposits were characterized through inductively coupled plasma(ICP), spiral contractometer, XRD, SEM and TEM. When the additive was added into the electrodeposition bath, current efficiency, Ni content and corrosion resistance of the deposit increased, whereas residual stress, surface roughness and grain size of the deposit decreased.

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A Study of Structures and Magnetic Properties of Electrodeposited Fe-45 wt％Ni-P Alloys (전착법에 의한 Fe-45 wt％Ni-P 합금의 조직과 자기적 성질에 관한 연구)

  • 구승현;이흥렬;김동환;황태진;임태홍
    • Journal of the Korean institute of surface engineering
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    • v.36 no.6
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    • pp.461-465
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    • 2003

  • The microstructures and magnetic properties of electrodeposited Fe-45 wt%Ni-P alloys have been investigated. The structures of electrodeposited Fe-45 wt%Ni alloy was FCC i.e. ${\gamma}$ phase and the size of crystallite was 10 nm. The structure of electrodeposited Fe-45 wt%Ni-1 wt%P alloy showed ${\gamma}$ phase and 7 nm sized nanocrystalline. The electrodeposited Fe-45 wt%Ni-P alloys containing 2∼3 wt% of P exhibited ${\gamma}$ ＋ $\alpha$ dual phases. The electrodeposited Fe-45 wt%Ni-P alloys above 3.5 wt% showed an amorphous structure. P in the alloys acted grain refining and phase changing element. The resistivity of the electrodeposited alloys increased with P contents. Effective permeability at high frequency (above 1 MHz) increased with P contents up to 2 wt% and this was ascribed to the easier magnetization rotation owing to the reduction of eddy current. Effective permeability decreased with P contents above 3 wt% and this was ascribed to the transformation of the ferromagnetism of Fe-45 wt%Ni alloy gradually into paramagnetism with the introduction of P into the electrodeposited alloy matrix.

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