Influence of Ultraviolet Light and Alternating Wet-Dry Environments on the Corrosion Behavior of Weathering Steels

The corrosion behaviors of two bridge steels (Q345q and Q500q) under simulated ultraviolet irradiation and a wet-dry alternating (UVWD) environment were studied. Weight loss measurement, stereomicroscope observation, SEM, XRD, and electrochemical impedance spectroscopy (EIS) were performed to invest...

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Published in:Materials 2024-08, Vol.17 (15), p.3870
Main Authors: Yang, Ying, Wang, Yubo, Du, Xinyu, Lin, Tianzi, Wang, Han, Meng, Fandi, Wang, Fuhui
Format: Article
Language:English
Subjects:
Atmospheric corrosion
Bridges
Corrosion
Corrosion effects
Corrosion environments
Corrosion rate
Corrosion resistance
Corrosion resistant steels
Corrosion tests
Electrochemical impedance spectroscopy
Environmental impact statements
Highway construction
Humidity
Influence
Light
Morphology
Nickel
Penetration resistance
Rusting
Steel
Structural steels
Synergistic effect
Ultraviolet radiation
Weathering steels
Weight loss measurement
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Summary:The corrosion behaviors of two bridge steels (Q345q and Q500q) under simulated ultraviolet irradiation and a wet-dry alternating (UVWD) environment were studied. Weight loss measurement, stereomicroscope observation, SEM, XRD, and electrochemical impedance spectroscopy (EIS) were performed to investigate the influence of the coupled environment. The results revealed that the corrosion rates of Q345q and Q500q were significantly accelerated by the synergistic effect of UV light exposure and alternating wet-dry conditions. Numerous voids and cracks could be observed throughout the thickened rust layers, enabling the corrosive substances to easily penetrate through the rust layer. Q500q exhibited better corrosion resistance than Q345q due to the addition of Mo, Cr, and Ni as corrosion-resistant elements, which tended to transform the rust layer into α-FeOOH rather than γ-FeOOH during later stages of corrosion.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17153870