Preparation and Corrosion Resistance of Nb2N Coating on TC4 Ti-alloy

doi:10.11902/1005.4537.2018.116

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (4): 313-318 DOI: 10.11902/1005.4537.2018.116

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Preparation and Corrosion Resistance of Nb₂N Coating on TC4 Ti-alloy

SHI Kunyu(

),ZHANG Jinzhong,ZHANG Yi,WAN Yi

Department of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430205, China

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Abstract

Nb₂N coating was deposited onto TC4 (Ti-6Al-4V) substrates via a double cathode glow discharge plasma method. The microstructure of the coating was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The adhesive property of Nb₂N coating to the substrate was assessed by scratch test. While the electrochemical behavior in 3.5% (mass fraction) NaCl solution of the coating was investigated with electrochemical techniques, such as open circuit potential (OCP) measurement, potentiodynamic polarization and EIS. Result shows that the as-deposited coating of 21 μm in thickness is dense with a homogeneous microstructure without obvious voids or micro-crack. Compared with TC4 matrix, the open-circuit potential of Nb₂N coating can reach a higher steady-state value within a shorter time interval, in other words, the coating presents higher corrosion potential (E_corr) and lower corrosion current. The data of EIS show that the Nb₂N coating shows a single capacitive reactance arc with higher capacitive reactance, larger phase angle maximum, as well as wider phase angle plateau, in the contrary to those of the bare TC4 Ti-alloy.

Key words: double cathode glow discharge plasma method Nb₂N coating microstructure corrosion resistance TC4(Ti-6Al-4V) alloy

Received: 22 August 2018

ZTFLH:

TG174.445

Fund: Wuhan Institute of Technology Scientific Research Fund(k201519)

Corresponding Authors: Kunyu SHI E-mail: shikunyuwh@126.com

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Cite this article:

SHI Kunyu,ZHANG Jinzhong,ZHANG Yi,WAN Yi. Preparation and Corrosion Resistance of Nb₂N Coating on TC4 Ti-alloy. Journal of Chinese Society for Corrosion and protection, 2019, 39(4): 313-318.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.116 OR https://www.jcscp.org/EN/Y2019/V39/I4/313

Fig.1 XRD pattern of Nb₂N coating

Fig.2 Cross-sectional SEM morphology of the as-deposit-ed Nb₂N coating (a) and EDS results of points A (b) and B (c) in Fig.2a

Fig.3 Acoustic emission signals of Nb₂N coating during scratching

Fig.4 Open circuit potentials of Nb₂N coating and TC4 alloy in 3.5%NaCl solution

Fig.5 Polarization curves of TC4 alloy and Nb₂N coating in 3.5%NaCl solution

Table 1 Fitting values of various electrochemical parameters based on polarization curves

Fig.6 Nyquist (a) and Bode (b) polts of Ti-6Al-4V alloy and Nb₂N coating in 3.5%NaCl solution

Fig.7 Equivalent circuit of electrochemical impedance spectroscopies of Nb₂N coating and TC4 alloy in 3.5%NaCl solution

Table 2 Fitted values of various electrochemical parameters for Nb₂N coating and TC4 alloy

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