Effect of Seawater Flow Velocity on Pitting Corrosion of 2205 Stainless Steel with Different Surface Treatments

doi:10.11902/1005.4537.2023.208

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 658-668 DOI: 10.11902/1005.4537.2023.208

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Effect of Seawater Flow Velocity on Pitting Corrosion of 2205 Stainless Steel with Different Surface Treatments

XING Shaohua¹, PENG Wenshan¹(

), QIAN Yao¹^,², LI Xiangbo¹, MA Li¹, 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

Cite this article:

XING Shaohua, PENG Wenshan, QIAN Yao, LI Xiangbo, MA Li, ZHANG Dalei. Effect of Seawater Flow Velocity on Pitting Corrosion of 2205 Stainless Steel with Different Surface Treatments. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 658-668.

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Abstract

2205 stainless steel is commonly used in pipeline systems. In the presence of flowing seawater the failure of passivation film on tubing can easily lead to accidents such as pipeline leakage. Therefore, it is of great significance to acquire the impact of flowing seawater on the pitting corrosion behavior of 2205 stainless steel with different surface treatments. Hence, 2205 stainless steel was firstly subjected to polish-treatment and passivation-treatment respectively, and then the pitting behavior of which in flowing seawater was assessed by means of electrochemical testing methods such as potentiodynamic polarization curve, electrochemical impedance spectroscopy, and Mott-Schottky curve as well as characterization of their morphology variation with corrosion process. It was found that there were obvious pits formed on the surface of either the polished or passivated steel, with pitting potentials ranging from 0.9 V to 1.2 V. The pitting resistance of the steel is higher in static seawater rather than in flowing seawater, but as the flow rate increases, the pitting resistance of the steel does not change significantly, however, the surface passivation film loses its re-passivation ability in flowing seawater. The passivation film on the surface of 2205 stainless steel exhibits two semiconductor characteristics: n-type and p-type, indicating that the passivation film presents a double-layer structure, mainly composed of oxides of Fe (outer portion) and Cr (inner portion). After passivation treatment, the pitting corrosion resistance of the steel increased, but the semiconductor properties of the passivation film did not show significant changes. The flowing seawater could reduce the pitting corrosion resistance of the steel, but the difference in the surface passivation film characteristics of the steel pre-treated by two methods could result in different sensitivity to pitting corrosion of the 2205 stainless steel in flowing seawaters.

Key words: 2205 stainless steel seawater pipeline erosion corrosion electrochemistry pitting corrosion passivation film

Received: 30 June 2023 32134.14.1005.4537.2023.208

ZTFLH:

TG172

Corresponding Authors: PENG Wenshan, E-mail: pengwenshan1386@126.com

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	XING Shaohua
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	LI Xiangbo
	MA Li
	ZHANG Dalei

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.208 OR https://www.jcscp.org/EN/Y2024/V44/I3/658

Fig.1 Potentiodynamic polarization curves of 2205 stainless steel in seawater with different flow rates: (a) polishing surface, (b) passivation surface

Fig.2 Relationships between pitting potential and flow rate for 2205 stainless steel samples pretreated by polishing and passivation

Table 1 Pitting protection potential and hysteresis ring size for 2205 stainless steel in static seawater

Fig.3 Polarization curves of polished and passivated 2205 stainless steel samples in seawater with the flow rates of 0 m/s (a), 1 m/s (b), 2 m/s (c), 3 m/s (d), 4 m/s (e) and 5 m/s (f)

Fig.4 Nyquist (a), impedance module (b) and phase angle (c) plots of polished 2205 stainless steel in seawater with different flow rates

Fig.5 Equivalent circuit for fitting EIS of stainless steel sample

Table 2 Fitting data of EIS of polished 2205 stainless steel in seawater with different flowing rates

Fig.6 Nyquist (a), impedance module (b) and phase angle (c) plots of passivated 2205 stainless steel in seawater with different flow rates

Table 3 Fitting data of EIS of passivated 2205 stainless steel in seawater with different flow rates

Fig.7 Mott-Schottky curves of polished (a) and passivated (b) 2205 stainless steel samples in flowing seawater

Fig.8 Comparison of acceptor and donor densities of polished (a) and passivated (b) 2205 stainless steel samples in flowing seawater

Fig.9 Three-dimensional morphologies of pitting pits of polished samples in seawater with the flow rates of 0 m/s (a), 1 m/s (b), 3 m/s (c) and 5 m/s (d)

Fig.10 Three-dimensional morphologies of pitting pits of pre-passivated samples in seawater with the flow rates of 0 m/s (a), 1 m/s (b), 3 m/s (c) and 5 m/s (d)

Fig.11 SEM morphologies of pitting pits of polished 2205 stainless steel in seawater with the flow rates of 0 m/s (a), 1 m/s (b), 3 m/s (c) and 5 m/s (d)

Table 4 Elemental compositions of the surfaces of polished 2205 stainless steel samples after corrosion in flowing seawater

Fig.12 SEM morphologies of pitting pits of pre-passivated 2205 stainless steel in seawater with the flow rates of 0 m/s (a), 1 m/s (b), 3 m/s (c) and 5 m/s (d)

Table 5 Elemental compositions of the surfaces of passivated 2205 stainless steel samples after corrosion in flowing seawater

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