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Acta Metall Sin  2020, Vol. 56 Issue (9): 1247-1254    DOI: 10.11900/0412.1961.2020.00013
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Initial Corrosion Behavior of Carbon Steel and Weathering Steel in Nansha Marine Atmosphere
LIU Yuwei1,2, ZHAO Hongtao1, WANG Zhenyao1()
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
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Abstract  

Along with the increasing pace of marine resource development and strategic deployment of China, the infrastructure materials and deployed aircraft were facing severe salt fog corrosion during the construction process of the South China Sea. Materials damage in this environment is much more serious than that in other marine atmospheric environment. Owing to its location near the equator and the direct impact of solar radiation, Nansha marine atmosphere is a representative and typical climate with high temperature, high humidity, high salinity and high radiation. However, there has been lack of material corrosion data and relevant fundamental research until now. Carbon steel is usually one of the most widely used infrastructure materials and reference materials, and its corrosion data exposed to Nansha Islands marine atmosphere is much more important. These corrosion data can not only provide important basis for environmental corrosivity category, but also provide reference for indoor accelerated corrosion test. Therefore, in order to obtain useful information on selected construction materials, adopting the appropriate corrosion protection methods, and predicting the life of metallic structures under service, the exposure test was conducted on carbon steel Q235 and weathering steel Q450NQR1 in Nansha Islands for 2 and 5 months. Thickness loss analysis, macroscopic observation, SEM, XRD, optical profiler and tensile tests were conducted to study the initial corrosion behavior on both sides of Q235 and Q450NQR1 in Nansha marine atmosphere. The results showed that the initial corrosion behavior of both steels at this site was more serious than those at most areas, such as Wanning and Xisha Islands, and the corrosion of skyward of both steels was more serious than that of field-ward. The rust layer formed on field-ward was easier to fall off. After exposure for 2 months, the thickness loss of Q235 was the same as that of Q450NQR1, and corrosion products on both sides were mainly composed of γ-FeOOH, α-FeOOH and Fe3O4; while after 5 months' exposure, the thickness loss of Q235 was much larger than that of Q450NQR1, and corrosion products were mainly composed of γ-FeOOH, α-FeOOH, Fe3O4 and β-FeOOH. The relative composition of β-FeOOH and γ-FeOOH was fewer on the field-ward, and the relative composition of Fe3O4 was fewer on the skyward.

Key words:  Nansha marine atmosphere      carbon steel      atmospheric corrosion mechanism      corrosion product     
Received:  10 January 2020     
ZTFLH:  TG172.3  
Fund: National Natural Science Foundation of China(51671197);Strategic Priority Research Program of Chinese Academy of Sciences(XDA13040502)
Corresponding Authors:  WANG Zhenyao     E-mail:  zhywang@imr.ac.cn

Cite this article: 

LIU Yuwei, ZHAO Hongtao, WANG Zhenyao. Initial Corrosion Behavior of Carbon Steel and Weathering Steel in Nansha Marine Atmosphere. Acta Metall Sin, 2020, 56(9): 1247-1254.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00013     OR     https://www.ams.org.cn/EN/Y2020/V56/I9/1247

SteelCSiMnPSCrNiCuFe
Q2350.220.080.100.0150.003---Bal.
Q450NQR10.080.310.410.0730.0060.470.150.29Bal.
Table 1  Chemical compositions of Q235 and Q450NQR1
Fig.1  Schematic of tensile test specimen (unit: mm)
Fig.2  Exposure site
Fig.3  Variation in the thickness loss of Q235 and Q450NQR1 as a function of exposure time
Fig.4  Composition of corrosion products formed on Q235 (a, b) and Q450NQR1 (c, d)
Fig.5  Macro-morphologies of the corrosion products on skyward (a~d) and field-ward (e~h) sides of Q235 and Q450NQR1
Fig.6  Cross-section micro-morphologies of the corrosion products on skyward (a~d) and field-ward (e~h) sides of Q235 and Q450NQR1
Fig.7  Three-dimensional morphologies on skyward surface (a~d) and field-ward surface (e~f) of Q235 and Q450NQR1 after removal of the corrosion products
SurfaceQ235Q450NQR1
2 months5 months2 months5 months
Skyward971512396870916805
Field-ward766310013751612462
Table 2  Surface roughnesses of Q235 and Q450NQR1
Fig.8  Stress (σ)-strain (ε) curves of Q235 (a) and Q450NQR1 (b) exposed for different months
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