Corrosion Behaviors of Carbon Steel and Ni-Advanced Weathering Steel Exposed to Tropical Marine Atmosphere
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Corrosion Behaviors of Carbon Steel and Ni-Advanced Weathering Steel Exposed to Tropical Marine Atmosphere Yueming Fan, Wei Liu, Zongteng Sun, Thee Chowwanonthapunya, Yonggang Zhao, Baojun Dong, Tianyi Zhang, Wongpat Banthukul, and Xiaogang Li (Submitted June 30, 2020; in revised form August 27, 2020; Accepted: 12 September 2020) The corrosion behaviors of carbon steel and Ni-advanced weathering steel exposed to tropical marine atmosphere were investigated by using electrochemical impedance spectroscopy, x-ray diffraction, transmission electron microscope and x-ray photoelectron spectroscopy measurements. The results showed that Ni had almost no effect on corrosion kinetics and electrochemical performance of Ni-advanced weathering steel in mild atmosphere. Conversely, Ni-advanced weathering steel in marine atmosphere showed a significant superiority in improving corrosion resistance compared with carbon steel. Moreover, the mass formation of NiFe2O4 in the inner rust layer promoted the stability of the corrosion resistance improvement rate of Ni-advanced weathering steel with the increase in exposure time. Therefore, Ni-advanced weathering steel seemed to be more suitable for the harsh marine atmospheric environment. Keywords
corrosion behavior, Ni-advanced weathering steel, rust layer, tropical marine atmosphere
1. Introduction It is well known that the addition of a small amount of alloying element Ni to weathering steel can significantly enhance its resistance to marine atmospheric corrosion (Ref 1, 2). Therefore, in recent years, Ni-advanced weathering steels have been widely used in coastal engineering of tropical atmospheric environment (Ref 3, 4). Moreover, it is generally believed that NiFe2O4 precipitated at an initial stage of the reaction provided a location for the nucleation of the Fe(O,OH)6 nano-network, thereby forming a film composed of dense fine particles (Ref 5, 6). The presence of NiFe2O4 in nano-network changed the ion exchange performance of the corrosion product film and made it have the selectivity from anion to cation, thus effectively hindering the penetration of chloride ions and improving the corrosion resistance of Nicontaining steel (Ref 7, 8). In general, the outdoor field exposure experiments can better reflect the corrosion situation and the application effect of steel in the actual environment. Up to now, there have been many researches on the influence of Ni on the corrosion behaviors of weathering steels under the outdoor exposure experiment of marine atmosphere in different countries. For example, Palsson et al. (Ref 9) investigated the corrosion resistance of weathering
Yueming Fan, Wei Liu, Zongteng Sun, Yonggang Zhao, Baojun Dong, Tianyi Zhang, Wongpat Banthukul, and Xiaogang Li, Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, PeopleÕs Republic of China; and Thee Chowwanonthapunya, Faculty of International Maritime Studies, Kasetsart University, Srir
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