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| Early Corrosion Behavior of EH36 Ship Plate Steel in Tropical Marine Atmosphere |
LI Ziyun1, WANG Gui1, LUO Siwei1, DENG Peichang2, HU Jiezhen1( ), DENG Junhao1, XU Jingming1 |
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 EH36 ship plate steel was exposed for 15, 30, 90, 180 and 360 d respectively in the atmosphere with high humidity, high heat, high salinity and strong radiation at the Zhanjiang marine atmospheric corrosion test station situated in the south of China. The corrosion behavior of different exposure periods were characterized by means of corrosion weight loss method, polarization curve measurement, scanning electron microscopy with energy dispersive spectroscopy and X-ray diffractometer. The results show that the corrosion rate of EH36 ship plate steel increases first and then decreases. After exposure for 360 d, Cr, Ni and Si elements diffuse into and uniformly distribute in the rust scale, which then improves the corrosion resistance of the steel. After exposure for 180 and 360 d, the formed rust scales composed of γ-FeOOH, β-FeOOH, Fe3O4 and α-FeOOH. While the one corresponded to 360 d exposure has more α-FeOOH and less β-FeOOH. In the rust scale of EH36 ship steel exposed for 360 d the ratio of α/γ=0.615, however, a stable protective rust scale has not yet appeared by this time.
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Received: 13 November 2019
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| Fund: National Natural Science Foundation of China(51801033);Guangdong University Students "Sail of the Sea-sailing Plan" Project(qhjh2017zr06) |
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Corresponding Authors:
HU Jiezhen
E-mail: jiezhen0520@163.com
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