Effect of Corrosion Product Film on Seabed Corrosion Behavior of X70 Pipeline Steel Weld

ZHANG Kaili; XIE Fei; WU Ming; WANG Dan; GAI Zuosong; LIU Jin

doi:10.11973/jxgccl202107003

Materials and Mechanical Engineering > 2021 > 45(7): 12-16,40. > DOI: 10.11973/jxgccl202107003

ZHANG Kaili, XIE Fei, WU Ming, WANG Dan, GAI Zuosong, LIU Jin. Effect of Corrosion Product Film on Seabed Corrosion Behavior of X70 Pipeline Steel Weld[J]. Materials and Mechanical Engineering, 2021, 45(7): 12-16,40. DOI: 10.11973/jxgccl202107003

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Effect of Corrosion Product Film on Seabed Corrosion Behavior of X70 Pipeline Steel Weld

1. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China;
2. No.2 Oil Plant of Fushun Petrochemical Company of PetroChina, Fushun 113006, China;
3. Refinery of Jilin Petrochemical Company, Jilin 132000, China

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Received Date: January 02, 2020
Revised Date: March 02, 2021

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Abstract

Abstract

After corrosion in simulated South China Sea mud solution for 10, 24, 72, 120 h, the morphology and composition of the corrosion products on surface of the weld of X70 pipeline steel were analyzed by scanning electron microscopy and energy spectroscopy. Then the effect of corrosion product film on the corrosion behavior of the weld was studied by slow strain rate tensile tests and potentiodynamic polarization tests. The results show that with increasing corrosion time, the corrosion product films on surface of the weld were thickened. A dense corrosion product film was formed after corrosion for 72 h, and more pores and cracks were formed in the film after 120 h corrosion. With increasing corrosion time, the stress corrosion sensitivity of the weld increased first, then decreased, and then slightly increased. The electrochemical corrosion behavior showed the same change. After corrosion for 72 h, the formation of the dense corrosion product film reduced the stress corrosion sensitivity of the weld and improved the corrosion resistance.
- X70 pipeline steel,
- weld,
- corrosion product film,
- corrosion behavior,
- stress corrosion

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