Corrosion Behavior of High Nickel and Conventional Weathering Steels Exposed to a Harsh Marine Atmospheric Environment at Maldives

doi:10.11902/1005.4537.2018.125

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (1): 29-35 DOI: 10.11902/1005.4537.2018.125

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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.

Key words: Ni-advanced steel Maldives marine atmosphere corrosion product corrosion resistance

Received: 04 September 2018

ZTFLH:

TG172

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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Cite this article:

Duoyun CHENG,Jinbin ZHAO,Bo LIU,Cheng JIANG,Xiaoqian FU,Xuequn CHENG. Corrosion Behavior of High Nickel and Conventional Weathering Steels Exposed to a Harsh Marine Atmospheric Environment at Maldives. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 29-35.

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https://www.jcscp.org/EN/10.11902/1005.4537.2018.125 OR https://www.jcscp.org/EN/Y2019/V39/I1/29

Table 1 Chemical compositions of high nickel and conventional weathering resistant steels (mass fraction / %)

Fig.1 Microstructural images of conventional WS (a) and high nickel WS (b)

Fig.2 Surface morphologies of corrosion products of conventional WS (a) and high nickel WS (c) after exposed for 1 a, and magnified images of the square areas in Fig.2a (b) and Fig.2c (d)

Fig.3 Cross-sectional morphologies of the corrosion products formed on the conventional WS (a) and high nickel WS (b) after exposure for 1 a

Table 2 Chemical compositions of different locations of corrosion products of the exposed WSs (mass fraction / %)

Fig.4 Phase compositions of corrosion products formed on the conventional and high nickel WSs after exposed for 1 a in Male island

Fig.5 Surface profiles of the exposed high nickel WS (a) and conventional WS (b) after exposed for 1 a in Male island

Fig.6 Cross-section morphologies of the high nickel WS (a) and conventional WS (b) after exposed for 1 a in Male island

Fig.7 Nyquist curves of exposed high nickel WS and convenional WS in 3.5%NaCl solution

Table 3 Fitting values of resistance and charge transfer resistance of corrosion products

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