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Korean Journal of Metals and Materials > Volume 58(1); 2020 > Article
Korean Journal of Metals and Materials 2020;58(1): 1-6. doi: https://doi.org/10.3365/KJMM.2020.58.1.1
Study on the Effect of the Thiourea on Nano-Mechanical Properties and Microstructures of the Electroformed Thin Ni-P Foil
Moo Young Jung1, Chang Su Nam1, Byung-Sik Lee2, Yong Choi1
1Department of Materials Science and Engineering Dankook University, Cheonan 31116, Republic of Korea
2Department of Nuclear Engineering, Dankook University, Cheonan 31116, Republic of Korea
Correspondence  Yong Choi ,Tel: +82-41-550-3537, Email: yochoi@dankook.ac.kr
Received: 16 September 2019;  Accepted: 30 November 2019.  Published online: 1 January 2020.
ABSTRACT
The effect of thiourea on the nano-mechanical and chemical properties of Ni-P foil was studied to develop a high performance Ni-P deposit for automobile and machinery parts. The Ni-P deposit was prepared by electroforming in a modified sulphate bath with different amounts of thiourea. Chemical analysis of the electrodeposited Ni-P foils by energy dispersive spectroscopy showed that phosphorous in the foil was reduced with thiourea. Structural analysis by X-ray diffractometry revealed that the (111) plane of the Ni-P deposits grew preferentially with increasing crystallinity. Surface analysis by atomic force microscopy and field-emission scanning electron microscopy showed that the surfaces of the Ni-P electrodeposited with 0 and 0.01 g/L thiourea were relatively smooth and clean showing no nodules, whereas, the cauliflower-like nodules were observed on the surfaces of the deposits prepared with 0.03, 0.05, 0.07 and 0.1 g/L thiourea. The surface roughness (RRMS) of the deposits increased by addition of 0.1 ppm of thiourea from 6 to 54 nm. Nano-mechanical properties of the Ni-P foil such as elastic modulus, hardness and stiffness determined by tribonano-indenter were tended to increase by addition of 0.1 ppm of thiourea from 77 to 156 GPa, 6.6 to 8.9 GPa and 109.6 to 186.6 µN/nm, respectively.
Keywords: electrodeposition, Ni-P, thiourea
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