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| Corrosion Characteristics of Butt Welds of Q690 High Strength Steel in Laboratory Test as an Enviormental Simulation of Ocean Splash Zone |
WEI Huanhuan1,2( ), LEI Tianqi3, ZHENG Dongdong2(), XIN Zhenke4 |
1.School of Architectural Engineering, Yangling Vocational & Technical College, Xianyang 712100, China
2.State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
3.School of Road, Bridge & Architecture, Shaanxi Rallway Institute, Weinan 714099, China
4.Gansu Institute of Water & Hydropower Engineering Investigation Design and Research, Lanzhou 730000, China |
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Abstract The corrosion characteristics of butt welds of Q690 high strength steel in the ocean splash zone was studied via laboratory simulation with a desired accelerated corrosion scheme of cyclic immersion in artificial seawater and maintenance in hot and humid chamber, in terms of the macroscopic and microscopic corrosion morphology, mass loss, pit size, and corrosion depth etc., so that to acquire the corrosion regulation of the steel. The results show that as the corrosion cycle increases, the metal luster gradually darkens, more rusts emerge on the weld joints, the formed rust rather loose with pelling off can be seen at local areas. After 100 d of corrosion, the mass loss rate of the steel is 8.46%. The observation results of laser scanning confocal microscope (LSCM) show that surface deposits can inhibit corrosion from extending along the depth direction. The corrosion process gradually transforms from needle-like corrosion spots to corrosion pits, the average depths of pits in the weld zone and heat affected zone are about 311.01 and 333.24 μm, respectively. The research results are of great significance for the durability evaluation of domestic high strength steel in marine environment.
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Received: 10 August 2021
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| Fund: National Natural Science Foundation of China(51978571);Yangling Vocational and Technical College 2021 Natural Science Foundation Project(ZK21-28) |
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Corresponding Authors:
WEI Huanhuan,ZHENG Dongdong
E-mail: wh0402@qq.com;2512978427@qq.com
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About author: ZHENG Dongdong, E-mail: 2512978427@qq.com
WEI Huanhuan, E-mail: wh0402@qq.com
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