Research Papers: Applications

Ion Nitriding CoCrMo Alloy for Orthopedic Applications Studied by X-Ray Photoelectron Spectroscopy Analysis and Tribocorrosion Behavior

[+] Author and Article Information
Qingliang Wang

School of Material Science and Engineering,
China University of Mining and Technology,
Xuzhou 221116, China
e-mail: wql889@cumt.edu.cn

Xin Zhang, Yong Luo

School of Material Science and Engineering,
China University of Mining and Technology,
Xuzhou 221116, China

Chuanhui Huang

School of Mechanical and Electrical Engineering,
Xuzhou Institute of Technology,
Xuzhou 221110, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 8, 2015; final manuscript received March 3, 2016; published online July 26, 2016. Assoc. Editor: Zhong Min Jin.

J. Tribol 139(1), 011104 (Jul 26, 2016) (7 pages) Paper No: TRIB-15-1365; doi: 10.1115/1.4033189 History: Received October 08, 2015; Revised March 03, 2016

In the present study, the composition of ion nitriding layer of forged CoCrMo alloy was analyzed by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The tribocorrosion was investigated in 25% calf serum solution. The results showed that CrN and Cr2N phases formed in ion nitriding layer. The content of CrN phase was about 70.2% and Cr2N is only about 29.8%. The corrosion potential (Ecorr) of ion nitriding sample was about −310 mV and the untreated sample was about −820 mV. On condition of tribocorrosion, the friction coefficient of untreated sample was less than those of nitriding sample under different applied loads. At the same applied load, the current density of ion nitriding sample was higher than that of the untreated one. Ktot and Kw of ion nitriding sample were less than the untreated one, which showed the better tribocorrosion resistance. The ratio of Kc/Kw for ion nitriding sample lied in the range of 0.1 < Kc/Kw < 1 under three tested loads, showing that the mechanism was controlled by a wear dominated corrosion.

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Fig. 1

Cross section SEM image of ion nitrided layer of CoCrMo alloy

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Fig. 2

Full scanning spectrum of XPS for ion nitriding CoCrMo alloy before and after etching processes

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Fig. 3

Fitted XPS spectrum for ion nitriding CoCrMo alloy: (a) Cr2p3 and (b) N1s

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Fig. 4

Quantitative calculation of binding energy: (a) Cr2p3 and (b) N1s

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Fig. 5

Microhardness of untreated and nitriding forged CoCrMo alloy

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Fig. 6

Polarization curves of as-polished and ion nitriding alloys in calf serum solution

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Fig. 7

Variation curves of friction coefficient under tribocorrosion: (a) untreated and (b) ion nitriding alloys

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Fig. 8

Variation curves of current densities under tribocorrosion: (a) untreated and (b) ion nitriding alloys

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Fig. 9

Total mass loss distribution for (a) untreated and (b) ion nitriding alloys

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Fig. 10

SEM micrographs of the wear scars on CoCrMo surface

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Fig. 11

Synergistic interactions for all loads of untreated and ion nitriding CoCrMo alloys




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