Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Characterization of Electro-deposited Ni-P Layer by Using Dynamic Nano-Indentation Method

동적 나노압침법을 이용한 Ni-P 도막의 특성 연구

  • Jung, Moo Young (Department of Materials Science and Engineering, Dankook University) ;
  • Baik, Youl (Department of Materials Science and Engineering, Dankook University) ;
  • Kang, Bo Kyeong (Department of Materials Science and Engineering, Dankook University) ;
  • Choi, Yong (Department of Materials Science and Engineering, Dankook University) ;
  • Kwon, Hyuk Joo (R&D Center, HANSCO)
  • 정무영 (단국대학교 신소재공학과) ;
  • 백열 (단국대학교 신소재공학과) ;
  • 강보경 (단국대학교 신소재공학과) ;
  • 최용 (단국대학교 신소재공학과) ;
  • 권혁주 (한스코 연구개발부)
  • Received : 2018.06.07
  • Accepted : 2018.08.09
  • Published : 2018.08.31
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Abstract

Dynamic nano-indentation method was applied to characterize thin electroformed Ni-P layers. The Ni-P layers were produced in a sulphamic acid bath at $50^{\circ}C$ in $0.02A/cm^2$ for 10-60 minutes. The chemical analyses by XRD and EDX showed that the Ni-P layers were very fine grains with mainly $Ni_3P$ with Ni. The surface roughness determined by atomic force microscopy increased with thickness, which was relative to the surface morphology. The nano-hardness and the stiffness of the thin Ni-P layers with thickness of 1.9, 6.2 and $7.5{\mu}m$ were 5.52, 6.52 and 6.77 [GPa] and 56.7, 76.2 and 108.0 [${\mu}N/nm$], respectively. The elastic modulus of the Ni-P layer increased with thickness such as 37.29, 54.50 and 78.76 [GPa], respectively. The surface roughness of the electroplated Ni-P layers with diverse thickness was 8.66, 18.56 and 35.22 [nm], respectively. The enhanced nano-mechanical properties were related to mainly residual stress of the Ni-P layers.

Keywords

References

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