Corrosion Behavior of Q460FRW Fire-resistant and Weathering Steel Exposed to Atmosphere in Jiangjin for 2 Years

GAO Lijun; LI Xuetao; ZHANG Xu; JIANG Shan; CAO Jianping; LIU Liwei

doi:10.7643/ issn.1672-9242.2025.12.016

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (12) : 125-132. DOI: 10.7643/ issn.1672-9242.2025.12.016

Environmental Test and Observation

Corrosion Behavior of Q460FRW Fire-resistant and Weathering Steel Exposed to Atmosphere in Jiangjin for 2 Years

GAO Lijun^1,2, LI Xuetao^1,2, ZHANG Xu^1,2, JIANG Shan^1,2, CAO Jianping^1,2, LIU Liwei^1,2

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Abstract

The work aims to study the corrosion behavior of Q460FRW fire-resistant and weathering steel exposed to atmosphere in Jiangjin for 2 years. The corrosion rate, rust layer structure, phase composition, and rust layer resistance of Q460FRW fire-resistant and weathering steel and Q345B carbon steel were investigated with methods including atmospheric exposure tests, SEM, XRD, and electrochemical analysis. The corrosion depth of Q345B exposed to atmosphere in Jiangjin for 2 years was 0.105 2 mm, while the corrosion depth of Q460FRW fire-resistant and weathering steel exposed to atmosphere in Jiangjin for 2 years was 0.067 4 mm, which was about 64% of the corrosion depth of Q345B. The rust layer of Q345B was loose and porous, while the rust layer of Q460FRW was dense with a thickness of about 70 μm. The content of α-FeOOH in Q345B rust layer was 13.2%, and the content of α-FeOOH in Q460FRW rust layer was 30.3%, which was about 2.3 times that of Q345B. The corrosion potential of Q345B rust layer was ‒0.245 V, the corrosion current density was 24.97 μA/cm², and the rust resistance was 115 Ω·cm². The corrosion potential of Q460FRW rust layer was ‒0.197 V, which was 48mV higher than that of Q345B. The corrosion current density of Q460FRW was 11.18 μA/cm², which was about 45% of the corrosion current density of Q345B. The rust resistance of Q460FRW was 223 Ω·cm², which was about twice that of Q345B. Cr, Cu, and Mo elements showed significant enrichment in the rust layer of Q460FRW. SO₂ in environment and the enrichment of alloying elements in the rust layer together impact the corrosion resistance of Q460FRW fire-resistant and weathering steel, which makes Q460FRW significantly better than Q345B carbon steel after 2 years of exposure to the industrial atmospheric environment in Jiangjin.

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fire-resistant and weathering steel / atmospheric corrosion / Jiangjin / rust layer / corrosion / alloy element

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GAO Lijun, LI Xuetao, ZHANG Xu, JIANG Shan, CAO Jianping, LIU Liwei. Corrosion Behavior of Q460FRW Fire-resistant and Weathering Steel Exposed to Atmosphere in Jiangjin for 2 Years[J]. Equipment Environmental Engineering. 2025, 22(12): 125-132 https://doi.org/10.7643/ issn.1672-9242.2025.12.016

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