Effect of Flowing Seawater on Corrosion Characteristics of Passivation Film on TA2 Pure-Ti Pipes

doi:10.11902/1005.4537.2023.292

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (4): 1038-1046 DOI: 10.11902/1005.4537.2023.292

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Effect of Flowing Seawater on Corrosion Characteristics of Passivation Film on TA2 Pure-Ti Pipes

PENG Wenshan¹, XING Shaohua¹(

), QIAN Yao¹^,², LIN Cunguo¹, HOU Jian¹, ZHANG Dalei³

1. National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
2. Qingdao Jimo District Bureau of industry and information technology, Qingdao 266205, China
3. School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China

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PENG Wenshan, XING Shaohua, QIAN Yao, LIN Cunguo, HOU Jian, ZHANG Dalei. Effect of Flowing Seawater on Corrosion Characteristics of Passivation Film on TA2 Pure-Ti Pipes. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1038-1046.

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Abstract

TA2 pure-Ti is a new generation of marine pipeline material, and the flowing seawater induced failure of its passivation film can deteriorate the durability of TA2 pure-Ti pipes. Hence the effect of flowing seawater on the corrosion behavior of TA2 pure-Ti being subjected to different surface treatments is of great significance for evaluating the service performance of TA2 pure-Ti pipes. Herein, the corrosion behavior of two surface treated TA2 pure-Ti rings in flowing seawater was comparatively studied in a home-made seawater pipeline integrated simulation set by means of measurements such as dynamic potential polarization, electrochemical impedance, and Mott Schottky analysis, as well as characterization of corrosion morphology and corrosion products. The results showed when the seawater flow rate below 5 m/s, the change in seawater flow rate had a relatively small impact on the corrosion resistance of the passive film on the surface of TA2 pure-Ti. When the potential rises, the passive film on the surface of TA2 showed a transient dissolution in flowing seawater, but it would soon be re-passivated, which did not have a significant impact on the corrosion resistance of the substrate material. Compared to the surface passivation treated ones, the polished TA2 exhibit limited diffusion characteristics of cathodic polarization in flowing seawater. This is mainly due to the presence of a passivation film on the surface of the passivated TA2, which consumes less oxygen than the surface polished ones that have not yet formed a passivation film. The depolarization of the polished TA2, which was controlled by oxygen mass transfer rate develops slowly, resulting in a limit current density that does not vary with the potential. The passivation films on the TA2, after being subjected to two surface treatments only exhibit n-type semiconductor characteristics in seawater, and after polarization testing, the material surface is flat without significant local corrosion.

Key words: TA2 pure-Ti seawater pipeline erosion-corrosion electrochemistry passivation film

Received: 14 September 2023 32134.14.1005.4537.2023.292

ZTFLH:

TG172

Corresponding Authors: XING Shaohua, E-mail: xingsh@sunrui.net

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	PENG Wenshan
	XING Shaohua
	QIAN Yao
	LIN Cunguo
	HOU Jian
	ZHANG Dalei

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.292 OR https://www.jcscp.org/EN/Y2024/V44/I4/1038

Fig.1 Electrolytic cell for electrochemical testing

Fig.2 Potentiodynamic polarization curves of TA2 pure-Ti at different flow rates: (a) polishing, (b) passivation

Fig.3 Nyquist (a), impedance module (b) and phase angle (c) plots of polished TA2 at different flow rates

Fig.4 Fitting circuit diagram of the sample after seawater erosion

Table 1 Fitting data of EIS of surface polished TA2 under different flowing seawater

Fig.5 Nyquist (a), impedance module (b) and phase angle (c) plots of surface passivated TA2 at different flow rates

Table 2 Fitting data of electrochemical impedance spectroscopy of surface passivated TA2 under different flowing seawater

Fig.6 Mott-Schottky curves of TA2 at different flow rates: (a) polishing, (b) passivation

Fig.7 Donor density (a, c) and flat band potential (b, d) of TA2 samples at different flow rates: (a, b) polishing, (c, d) passivation

Fig.8 Three-dimensional morphologies of polished TA2 at different flow rates: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.9 Three-dimensional morphologies of passivation TA2 at different flow rates: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.10 Morphologies of polished TA2 at different flow rates: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

Fig.11 Morphologies of passivated TA2 at different flow rates: (a) 0 m/s, (b) 1 m/s, (c) 3 m/s, (d) 5 m/s

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