Effect of Ru on Corrosion Behavior of Ti-6Al-4V Alloy and Its Mechanism

doi:10.11902/1005.4537.2018.185

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (1): 25-30 DOI: 10.11902/1005.4537.2018.185

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Effect of Ru on Corrosion Behavior of Ti-6Al-4V Alloy and Its Mechanism

WANG Le^1,²,YI Danqing^1,²,LIU Huiqun²(

),JIANG Long³,FENG Chun³

1. Light Alloy Research Institute, Central South University, Changsha 40083, China
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China
3. Tubular Goods Research Institute of CNPC, Xi'an 710065, China

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Abstract

The effect of Ru addition on the corrosion behavior of Ti-6Al-4V (TC4) alloy in HCl solution were studied by means of electrochemical method, energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). The corrosion products and concentration variation of elements along surface depth were analyzed. The results showed that, the addition of Ru increased the corrosion potential of TC4 alloy in 10% (mass fraction) HCl solution from -0.585 V to -0.529 V, and the corrosion current density decreased from 6.193×10^-5 A/cm² to 2.750×10^-5 A/cm². The passive current densities changed a little, from 2.335×10^-5 A/cm² to 2.608×10^-5 A/cm². The addition of Ru reduced the corrosion rate of TC4 alloy in 15% (mass fraction) HCl solution from 1.48 mm/a to 0.94 mm/a as well. According to XPS results, the main corrosion products of TC4 alloy after corrosion in HCl solution were TiO₂, Al₂O₃ and V₂O₅. During the corrosion, Ru played an effective role in cathodic modification, promoted the deposition of TiO₂ passive film on the surface and thickened the passive film by one time. Therefore, Ru increased the denseness of the passive film, thereby improved the corrosion resistance of TC4 alloy effectively.

Key words: Ti-6Al-4V alloy Ru electrochemical XPS corrosion resistance mechanism

Received: 24 December 2018

ZTFLH:

TG146.2

Fund: National Science and Technology Major Project(2016ZX05020-002)

Corresponding Authors: Huiqun LIU E-mail: liuhuiqun@csu.edu.cn

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Cite this article:

WANG Le,YI Danqing,LIU Huiqun,JIANG Long,FENG Chun. Effect of Ru on Corrosion Behavior of Ti-6Al-4V Alloy and Its Mechanism. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 25-30.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.185 OR https://www.jcscp.org/EN/Y2020/V40/I1/25

Table 1 Chemical compositions of TC4 and TC4-Ru alloys (mass fraction / %)

Fig.1 Open potentials of TC4 and TC4-Ru alloys in 10%HCl solution

Fig.2 Potentiodynamic polarization curves of TC4 and TC4-Ru alloys in 10%HCl solution

Table 2 Anodic polarization parameters of TC4 and TC4-Ru alloys in 10%HCl solution

Fig.3 Measured corrosion rates of TC4 and TC4-Ru alloys in 15%HCl solution at 37 ℃

Fig.4 Surface morphologies of TC4 (a) and TC4-Ru (b) alloys after immersion in 15%HCl solution at 37 ℃ for 3 h

Fig.5 SEM image of TC4-Ru alloy after immersion in 15%HCl solution at 37 ℃ for 10 d

Table.3 EDS analysis results of the points marked in Fig.5 (mass fraction / %)

Fig.6 XPS spectra of Ti 2p (a, b), Al 2p (c, d), V 2p (e, f) and Ru 3d (g) on the surfaces of TC4 (a, c, e) and TC4-Ru (b, d, f, g) alloys after immersion in 15%HCl solution at 37 ℃ for 10 d

Fig.7 XPS spectra of Ti 2p for TC4 (a) and TC4-Ru (b) alloys after immersion in 15%HCl solution at 37 ℃ for 10 d and then sputtering for 0, 70, 140 and 210 s

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