Synergistic Effect Mechanism of Different Ions on the Electrochemical Corrosion Behavior of TC4 Titanium Alloy

doi:10.11900/0412.1961.2021.00266

Acta Metall Sin

2023, Vol. 59

Issue (7): 939-946 DOI: 10.11900/0412.1961.2021.00266

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Synergistic Effect Mechanism of Different Ions on the Electrochemical Corrosion Behavior of TC4 Titanium Alloy

ZHAO Pingping¹, SONG Yingwei¹^,²(

), DONG Kaihui¹^,², HAN En-Hou¹^,²

¹CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
²Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China

Cite this article:

ZHAO Pingping, SONG Yingwei, DONG Kaihui, HAN En-Hou. Synergistic Effect Mechanism of Different Ions on the Electrochemical Corrosion Behavior of TC4 Titanium Alloy. Acta Metall Sin, 2023, 59(7): 939-946.

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Abstract

Due to the compact passive film, titanium alloys exhibit excellent corrosion resistance. However, during practical applications, the passive film is inevitably damaged by aggressive ions. Among the common ions, F^- is the most harmful to the passive film because of its high complexation with Ti. However, the destructiveness of F^- varies with pH. Moreover, there are inhibitory ions that reduce the aggressiveness of F^-. The acceleration effects of H⁺ and F^- as well as the inhibition effect of Fe³⁺ on the corrosion behavior of TC4 alloy were examined in this work using electrochemical polarization curves measurements and electrochemical impedance spectroscopy (EIS). The results reveal that whereas H⁺ has slight destructive effect on the passive film, F^- has a considerable aggressive effect. In particular, F^- and H⁺ work synergistically to accelerate the corrosion of the TC4 alloy. The addition of Fe³⁺ can somewhat reduce corrosion of the TC4 alloy. This can be attributable to the fact that the faster cathodic reduction caused by Fe³⁺ moves the anodic curves from active-passive region to passive region. Meanwhile, F^- is consumed by forming a compound with Fe³⁺, which mitigates the corrosive effect of F^- on passive film.

Key words: titanium alloy electrochemical corrosion synergistic effect passive film ion

Received: 29 June 2021

ZTFLH:

TG178

Fund: Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)(311021013)

Corresponding Authors: SONG Yingwei, professor, Tel: (024)23893115, E-mail: ywsong@imr.ac.cn

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	ZHAO Pingping
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	HAN En-Hou

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00266 OR https://www.ams.org.cn/EN/Y2023/V59/I7/939

Fig.1 OM images of TC4 alloy with low (a) and high (b) magnifications

Fig.2 Potentiodynamic polarazation curves (a) and EIS (b) of TC4 alloy in 3.5%NaCl solutions with different H⁺ concentrations (c_H)

Table 1 Fitting results of polarization curves of TC4 alloy in 3.5%NaCl solutions with different c_H

Fig.3 Potentiodynamic polarazation curves (a) and EIS (b) of TC4 alloy in 3.5%NaCl solutions with different F^- concentrations (c_F)

Table 2 Fitting results of polarization curves of TC4 alloy in 3.5%NaCl solutions with different c_F

Fig.4 Potentiodynamic polarazation curves (a) and EIS (b) of TC4 alloy in 3.5%NaCl + 50 mmol/L H⁺ sol-utions with different c_F (Inset in Fig.4b shows the EIS of TC4 alloy in 3.5%NaCl + 50 mmol/L H⁺ solutions with c_F of 3, 4, 6, and 8 mmol·L^-1)

Table 3 Fitting results of polarization curves of TC4 alloy in 3.5%NaCl + 50 mmol/L H⁺ solutions with different c_F

Fig.5 Potentiodynamic polarazation curves of TC4 alloy in 3.5%NaCl + 3 mmol/L F^- solutions with different c_H

Fig.6 Potentiodynamic polarazation curves (a) and EIS (b) of TC4 alloy in 3.5%NaCl + 50 mmol/L H⁺ + 3 mmol/L F^- solutions with different Fe³⁺ concen-trations (c_Fe)

Table 4 Fitting results of polarization curves of TC4 alloy in 3.5%NaCl + 50 mmol/L H⁺ + 3 mmol/L F^- solutions with different c_Fe

Fig.7 Effects of Fe³⁺ on the cathodic (a) and anodic (b) polarazation curves of TC4 alloy in 3.5%NaCl solution

Fig.8 Sketch maps of the effect of different ions on the polarazation curves of Ti alloy
(a) F^- (b) H⁺ + F^- (c) H⁺ + F^-+ Fe³⁺

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