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Corrosion Behavior of High Nickel and Conventional Weathering Steels Exposed to a Harsh Marine Atmospheric Environment at Maldives |
Duoyun CHENG1,Jinbin ZHAO2,Bo LIU3,Cheng JIANG4,Xiaoqian FU4,Xuequn CHENG4() |
1. China Communications Second Navigation Engineering Bureau Co., Ltd., Wuhan 430040, China 2. NanJing Iron & Steel Co., Ltd., Nanjing 210035, China 3. China Communications Construction Company Highway Consultants Co., Ltd. HPDI, Beijing 100088, China 4. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Corrosion behavior of high nickel weathering steel and conventional weathering steel was contrastively studied in a harsh marine atmosphere environment at Maldives through one-year field exposure tests. Then the corrosion products and the surface morphology of the steels after exposure were characterized by means of scanning electron microscope (SEM), laser scanning confocal microscope (LSCM) and X-ray diffractometer (XRD), while the corrosion resistance of corrosion products formed on the steels was also assessed by electrochemical impedance spectroscopy (EIS). Results indicated that a compact rust scale composed of Fe3O4, α-FeOOH, γ-FeOOH and β-FeOOH formed on these two steels. However, the high nickel weathering steel exhibited better weather resistance due to the addition of Ni, which presented the following peculiar features: a denser rust scale with stronger resistance to Cl- attack and higher α/γ ratio. EIS results confirmed that the corrosion product film of high nickel weathering steel had higher corrosion resistance, thus slowing down its corrosion rate in the harsh marine atmosphere.
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Received: 04 September 2018
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Fund: Supported by National Key Research and Development Program of China(2016YFB0300604) |
Corresponding Authors:
Xuequn CHENG
E-mail: chengxuequn@ustb.edu.cn
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