Research on Initial Corrosion Behavior of X60 Pipeline Steel in Simulated Tidal Zone

doi:10.11902/1005.4537.2021.150

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (2): 338-344 DOI: 10.11902/1005.4537.2021.150

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Research on Initial Corrosion Behavior of X60 Pipeline Steel in Simulated Tidal Zone

LI Ping(

)

PipeChina Network Corporation Eastern Oil Storage and Transportation Co. Ltd. , Xuzhou 221000, China

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Abstract

In an experiment tank of simulated tidal zone, the variation of corrosion behavior of X60 pipeline steel with the tidal water fluctuations at different monitoring positions was characterized by means of corrosion morphology observation, corrosion product analysis, and in-situ open-circuit potential monitoring. The results show that the corrosion behavior of pipeline steel is different at different positions in tidal zone. The corrosion rate in the middle and low tide areas is faster than that in the highest and lowest tide areas. With the decrease of tidal level, the open circuit potential decreases continuously. The cathodic process in the highest tide zone is mainly controlled by oxygen reduction. The cathodic process in the middle and low tide zone is controlled by rust reduction during high tide, and it is controlled by oxygen reduction during ebb tide. The change process of open-circuit potential in the lowest tide zone has nothing to do with tide fluctuation.

Key words: X60 pipeline steel laboratory simulation tidal corrosion open-circuit potential dry wet alternation

Received: 29 June 2021

ZTFLH:

TG172.5

Corresponding Authors: LI Ping E-mail: 784067690@qq.com

About author: LI Ping, E-mail: 784067690@qq.com

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Cite this article:

LI Ping. Research on Initial Corrosion Behavior of X60 Pipeline Steel in Simulated Tidal Zone. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 338-344.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.150 OR https://www.jcscp.org/EN/Y2022/V42/I2/338

Fig.1 Schematic diagram of the open-circuit potential monitoring: (a) reference electrode, (b) monitoring positions, (1) sponge probe, (2) cork, (3) seawater, (4) salt bridge, (5) SCE, (6) saturated KCl solution, (7) valve

Fig.2 Microscopic corrosion morphology of X60 pipeline steel at position 1 (a), position 2 (b), position 3 (c) and position 4 (d)

Fig.3 XRD results of the rust phase composition of the steels after being exposed in the experimental trough at position 1 (a), position 2 (b), position 3 (c) and position 4 (d)

Fig.4 Corrosion rate change results of four test positions after tidal corrosion for 30 d

Fig.5 Curve of the steel Open-circuit potential with 0~2 d (a), 8~10 d (b), 18~20 d (c) and 28~30 d (d)

Fig.6 Curves of the X60 pipeline steel open-circuit potential with change of tide on the 30 d

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