Study on Corrosion Behavior of Q345qDNH Weathering Steel in Simulated Industrial Marine Atmosphere

Huaifeng Li; Xin Jia; Hongbo Wang; Hanbin Ge; Jiandong Zhang

doi:10.13206/j.gjgs23051701

Volume 38 Issue 10

Oct. 2023

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Huaifeng Li, Xin Jia, Hongbo Wang, Hanbin Ge, Jiandong Zhang. Study on Corrosion Behavior of Q345qDNH Weathering Steel in Simulated Industrial Marine Atmosphere[J]. STEEL CONSTRUCTION(Chinese & English), 2023, 38(10): 16-24. doi: 10.13206/j.gjgs23051701

Citation:

Huaifeng Li, Xin Jia, Hongbo Wang, Hanbin Ge, Jiandong Zhang. Study on Corrosion Behavior of Q345qDNH Weathering Steel in Simulated Industrial Marine Atmosphere[J]. STEEL CONSTRUCTION(Chinese & English), 2023, 38(10): 16-24. doi: 10.13206/j.gjgs23051701

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Study on Corrosion Behavior of Q345qDNH Weathering Steel in Simulated Industrial Marine Atmosphere

doi: 10.13206/j.gjgs23051701

1. Shandong Provincial Communications Planing and Design Institute Group Co., Ltd., Jinan 250031, China;
2. Nanjing Tech University, Nanjing 211816, China;
3. Meijo University, Nagoya 468-8502, Japan;
4. National Key Laboratory of Safety, Longevity and Health O&M of Bridges, Nanjing 210017, China

Received Date: 2023-05-17
Available Online: 2023-12-25

Abstract

Abstract

For the typical bridge weathering steel in practical engineering as the object, the change laws of the surface morphology, phase composition, corrosion weight loss, dynamic curve and electrochemical properties of the rust layer of weathering steel were studied through periodic immersion accelerated corrosion test, and the macro morphology observation method, scanning electron microscope(SEM), X-ray diffraction analysis(XRD) and other methods, The corrosion behavior of Q345qDNH typical weathering steel under simulated industrial marine atmospheric environment NaHSO₃ and different NaCl concentrations was investigated.
The results show that the corrosion products on the surface of weathering steel are mainly composed of α-FeOOH, γ-FeOOH, β-FeOOH, Fe₂O₃, Fe₃O₄, and the NaCl concentration in the corrosion environment is positively related to the corrosion weight loss rate of weathering steel. When the concentration of NaCl is 0.1%, the corrosion weight loss rate of weathering steel rapidly drops to the low position with the extension of corrosion time and then tends to be stable. After 1 440 h of corrosion, the surface of the rust layer is uniform and dense, and the average corrosion weight loss rate is about 0.76 g/(cm²·h); when the NaCl ion concentration in the corrosion environment is 3.5%, the corrosion weight loss rate of weathering steel is at a high level and increases first and then decreases with the extension of corrosion time. After 1 440 h of corrosion, there are many cracks and holes on the surface of the rust layer, and the average corrosion weight loss rate is about 0.89 g/(cm²·h). Therefore, the lower the NaCl concentration, the more positive the self corrosion potential of weathering steel, the smaller the self corrosion current density and the slower the corrosion weight loss rate. The self corrosion current density of weathering steel is 105.65 μA/mm² after being corroded for 1 440 h in the environment with 0.1%NaCl concentration, in the rust layer α-FeOOH/(β-FeOOH+γ-FeOOH) ratio is close to 2, much higher than 0.104 in 3.5%NaCl concentration. At this time, the state of rust layer tends to be stable, and it has a good protection effect on weathering steel matrix.
- bridge weathering steel,
- industrial-marine atmospheric corrosion environment,
- Chloride ion concentration,
- corrosion behavior

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References(21)

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