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| Effect of Deep Sea Hydrostatic Pressure on Corrosion of High Strength Steel Welded Joints |
| Received:July 01, 2024 Revised:August 09, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.10.015 |
| KeyWord:deep sea high strength steel welding joints corrosion electrochemistry corrosion products |
| Author | Institution |
| PENG Wenshan |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| LI Jinze |
PipeChina Engineering Technology Innovation Co., Ltd., Tianjin , China |
| HU Na |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China;College of New Energy, Shandong Qingdao , China |
| WANG Ping |
School of Architecture and Engineering, Qingdao Binhai University, Shandong Qingdao , China |
| CAO Xuewen |
College of Pipeline and Civil Engineering, China University of Petroleum East China, Shandong Qingdao , China |
| HOU Jian |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
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| Abstract: |
| In deep-sea environment, high-strength steel welded joints often suffer from various types of corrosion, such as pitting corrosion and stress corrosion. The work aims to study the effect of deep sea hydrostatic pressure on the corrosion of welded joints and explore the corrosion mechanism. Methods such as corrosion microstructure observation, corrosion product analysis, and electrochemical characterization were combined to study the corrosion behavior of high-strength steel welded joints in low-temperature seawater and deep sea environments. The results indicated that, the increase of hydrostatic water pressure would exacerbate the corrosion of Ni-Cr-Mo-V high strength steel welded joints. The corrosion rate of high-strength steel welded joints in low-temperature seawater and deep-sea environments showed a trend of rapid decrease in the early stage and later slowing down with the increase of corrosion time. The main corrosion products on high-strength steel welded joints after immersing in seawater for different periods were α-Fe2O3, γ-FeOOH, α-FeOOH and Fe3O4. High strength steel welded joints suffered comprehensive corrosion, mainly with a trend of uniform corrosion pits merging, on the surface in low-temperature seawater environments, while localized corrosion mainly occurred in deep-sea environments. Different hydrostatic pressures cause changes in the corrosion pattern of high-strength steel welded joints, which in turn affects their corrosion rate. |
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