Corrosion Behavior of Carburized Ti6Al4V Ti-alloy in HF Solution

doi:10.11901/1005.3093.2018.650

Chinese Journal of Materials Research

2019, Vol. 33

Issue (7): 543-551 DOI: 10.11901/1005.3093.2018.650

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Corrosion Behavior of Carburized Ti6Al4V Ti-alloy in HF Solution

Kunmao Li¹,Jing LIU²(

),Xiaoyan ZHANG¹,Hong LI²,Yan DAI²

1. College of Materials and Metallurgy, Guizhou University, Guiyang 550003, China
2. School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550025, China

Cite this article:

Kunmao Li,Jing LIU,Xiaoyan ZHANG,Hong LI,Yan DAI. Corrosion Behavior of Carburized Ti6Al4V Ti-alloy in HF Solution. Chinese Journal of Materials Research, 2019, 33(7): 543-551.

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Abstract

The rapid carburization of Ti6Al4V titanium alloy was carried out by vacuum induction carburizing method. The corrosion behavior of carburized Ti-alloy in HF solution was investigated. Results show that after rapid carburization a layer of TiC and CTi_0.42V_1.58 composite compound was formed on the surface of T-alloy, and in comparison with the blank Ti-alloy, the corrosion rate in 0.2% HF solution decreases from 4.65×10^-10 g·m^-2·h^-1 to 3.3×10^-10 g·m^-2·h^-1 for the carburized Ti-alloy. Correspondingly, the free-corrosion potential increased from -0.94 V to -0.68 V, the corrosion current density decreased from 4.10 mA·cm^-2 to 1.65 mA·cm^-2, the polarization resistance increases from 6.36 Ω·cm² to 15.8 Ω·cm² and R_t increases from 0.2 Ω·cm² to 5.7 Ω·cm². The corrosion product of carburized layer mainly exhibits n-type semiconductor characteristics, and that of the blank Ti-alloy exhibits p-type semiconductor characteristics. The corrosion mechanism of F^- on the carburized layer of Ti6Al4V Ti-alloy is mainly hydrogen evolution corrosion.

Key words: surface and interface carburizing induction heating Ti6Al4V microstructure corrosion behavior

Received: 12 November 2018

ZTFLH:

TG178

Fund: National Natural Science Foundation of China(51574096);National Natural Science Foundation of China(51464008);Guizhou Excellent Young Science and Technology Talents Training Project([2016]5607)

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	Kunmao Li
	Jing LIU
	Xiaoyan ZHANG
	Hong LI
	Yan DAI

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.650 OR https://www.cjmr.org/EN/Y2019/V33/I7/543

Fig.1 Induction carburizing process of Ti6Al4V

Table 1 Tafel fitting parameters of polarization curve

Fig.2 Loss of weight changes with time

Fig.3 Polarization curves of Ti6Al4V titanium alloy under different conditions

Fig.4 Impedance spectrum and equivalent circuit diagram of Ti6Al4V titanium alloy under different conditions (a) Nyquist plot, (b) impedance modulus, (c) phase Angle, (d) equivalent circuit

Table 2 Fitting results of EIS curve

Fig.5 Mott-Schottky curve of Ti6Al4V titanium alloy under different conditions

Table 3 Fitting results of donor density or acceptor density of passivation film

Fig.6 XRD pattern of Ti6Al4V titanium alloy under different conditions

Fig.7 Cross-section structure of Ti6Al4V titanium alloy under different conditions (a) raw, (b) 850℃, (c) 880℃, (d) 910℃

Fig.8 Surface corrosion morphology and EDS composition analysis

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