Electrochemical Activation of Passivated Pure Titanium in Artificial Seawater

doi:10.11902/1005.4537.2018.050

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (2): 123-129 DOI: 10.11902/1005.4537.2018.050

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Electrochemical Activation of Passivated Pure Titanium in Artificial Seawater

Shaokun YAN¹,Dajiang ZHENG¹,Jiang WEI¹,Guangling SONG¹(

),Lian ZHOU²

1. Center for Marine Materials Corrosion & Protection, College of Materials, Xiamen University, Xiamen 361005, China
2. Institute of Advanced Metallic Materials, Nanjing Tech University, Nanjing 211800, China

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Abstract

As one of the most corrosion resistant metallic material, Ti or its alloy may find a variety of applications in the marine industry. It is important to understand the passivation mechanism of Ti in seawater. In this paper, the activation process of a passivated pure titanium TA2 in artificial seawater was investigated by means of potentiostat polarization, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The influence of seawater composition on the activation behavior was also studied. The result showed that the activation occurred around 1.6 V (SCE). Scanning electron microscope (SEM) and oxygen evolution monitoring indicated that obvious defects emerged on the surface of TA2 but no bubble was detected by applied potentials in the range of 1.4~1.6 V (SCE). According to Mott?Schottky analysis of the passivated and activated TA2 surface, the activation might be attributed to a transition of the semiconducting performance of the surface film on TA2.

Key words: pure titanium passive film electrochemical measurement seawater composition

Received: 17 April 2018

ZTFLH:

TG178

Fund: Supported by National Natural Science Foundation of China(51671163)

Corresponding Authors: Guangling SONG E-mail: guangling.song@hotmail.com

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Cite this article:

Shaokun YAN,Dajiang ZHENG,Jiang WEI,Guangling SONG,Lian ZHOU. Electrochemical Activation of Passivated Pure Titanium in Artificial Seawater. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 123-129.

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https://www.jcscp.org/EN/10.11902/1005.4537.2018.050 OR https://www.jcscp.org/EN/Y2019/V39/I2/123

Fig.1 Potentiodynamic polarization curves of TA2 in artif-icial seawater and various NaCl solutions with diffe-rent seawater ions

Fig.2 Oxygen evolution images of TA2 polarized at 2.3 V for 1 h (a) and at 2.3 V (b), 2.5 V (c) and 3.2 V (d) for 2 h in artificial seawater

Fig.3 Last monitoring current density of TA2 polarized at different constant potentials for 2 h in artificial seawater

Fig.4 General Nyquist plots (a) and partial enlarged draw-ings (b) of TA2 polarized in artificial seawater at different polarization potentials for 5 h

Fig.5 Equivalent circuit and R_p values obtained by fitting EIS of TA2 after polarization in artificial seawater for 5 h

Fig.6 SEM images of polished TA2 samples polarized at 0.5 V (a), 1.4 V (b) and 1.6 V (c) for 2 h in artificial seawater

Fig.7 Linear fitting results of EIS based on Mott-Schottky model in the potential ranges of 0.1~1.4 V and 1.8~3.2 V (triangle data points were excluded)

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