冲刷速率与压力耦合作用对X70管线钢腐蚀行为的影响机制

doi:10.11896/cldb.24070182

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Abstract The safe operation of X70 pipeline steel in deep ocean environments is crucial for the development of offshore oil and gas resources. An experimental setup for simulating deep ocean scouring corrosion reactions was independently designed and constructed. Through weight-loss corrosion tests, electrochemical tests, and microscopic characterization, the scouring corrosion behavior of X70 pipeline steel under deep ocean conditions (5 MPa) and the corrosion mechanisms of their coupling effects were studied. The results show that under the combined effects of pressure and scouring, the corrosion morphology of X70 pipeline steel consists of a combination of uniform corrosion and pitting corrosion. As the scouring rate increases, the impedance value decreases, and the corrosion resistance deteriorates. The corrosion products are primarily γ-FeOOH, β-FeOOH, α-Fe₂O₃, and Fe₃O₄. High pressure promotes corrosion and accelerates the overall growth of corrosion products. Scouring promotes the formation of α-Fe₂O₃ and γ-FeOOH while inhibiting the formation of β-FeOOH. High pressure coupled with low scouring rate produces a weakening effect, while coupling with high scouring rate results in a strengthening effect. The critical scouring rate is 2.25 m/s, and the critical impact energy is 0.762 J. This study reveals the corrosion behavior and influencing mechanisms of X70 pipeline steel under different scouring rates and deep ocean pressure coupling, providing data support and theoretical guidance for the corrosion protection and lifespan prediction of subsea pipeline steel.

Key words： X70 pipeline steel scouring rate pressure coupling effect corrosion behaviour

Published: 25 February 2026 Online: 2026-02-13

CLC number:

TG178

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	Articles by authors
	QIN Zu’an
	REN Pengwei
	TANG Xingying
	ZHU Riguang
	CHEN Jiquan

Cite this article:

QIN Zu’an,REN Pengwei,TANG Xingying, et al. Mechanism of Scouring Rate and Pressure Coupling on the Corrosion Behaviour of X70 Pipeline Steel[J]. Materials Reports, 2026, 40(4): 24070182-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24070182 OR https://www.mater-rep.com/EN/Y2026/V40/I4/24070182

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