1 Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Coral Reef Research Center of China, School of Marine Sciences, Guangxi University, Nanning 530004, China 2 School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
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.
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2026, Vol. 40 
