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| Corrosion Behavior of E690 Steel in Tropical Marine Atmosphere |
HU Jiezhen1, LAN Wenjie1, DENG Peichang2, WU Jingquan1( ), ZENG Junhao1 |
1.College of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang 524088, China
2.College of Chemistry and Environment, Guangdong Ocean University, Zhanjiang 524088, China |
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Abstract The exposure tests of E690 steel were carried out in tropical marine atmosphere of high temperature, high humidity and high salt at Zhanjiang atmospheric corrosion test station for 15, 30, 90, 180 and 360 d. Meanwhile, the initial corrosion behavior of E690 steel in tropical marine atmosphere was studied by mass loss method and electrochemical measurement, combined with macroscopic and microscopic corrosion morphology observation and corrosion product analysis. The results showed that the corrosion rate of E690 steel was higher at the beginning, and then decreased with the prolongation of exposure time. After 90 d of exposure, the corrosion rate changed little and the corrosion tended to be stable. After 90 d of exposure, Cr has diffused into the rust scale, thus improving the compactness of the rust scale. The participation of Ni promotes the transformation of γ-FeOOH to α-FeOOH, which then improved the corrosion resistance of E690 steel and reduced its corrosion rate.
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Received: 07 December 2022
32134.14.1005.4537.2022.388
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| Fund: National Natural Science Foundation of China(51801033);Natural Science Foundation of Guangdong Province(2021A1515012129);Science & Technology Development Fundation of Zhanjiang(2022A01029) |
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Corresponding Authors:
WU Jingquan, E-mail: lengfeng402@163.com
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