In order to accurately assess the actual corrosion damage of weathering steel bridges under service conditions, accelerated corrosion tests were conducted on Q355NHB and Q355B steels under four stress ratios and five exposure durations. Microscopic observation and surface morphology scanning were employed to investigate the evolution of corrosion morphology, as well as the temporal and stress-dependent development of surface roughness and mass loss rate. The results show that the influence of stress is most pronounced during the early stages of corrosion, with pits progressively coalescing into stepped morphologies exceeding 2 000 μm in diameter as corrosion duration increased. An increase in stress ratio is found to induce grain refinement, with the maximum reduction in Feret diameter reaching 31.92% relative to the stress-free condition. Moreover, surface roughness and mass loss rate under stress conditions are elevated by 30% and 6.63%, respectively, compared to those observed in the absence of stress. It is concluded that omitting the effects of mechanical stress in corrosion assessments may lead to a substantial underestimation of actual material degradation in structural steels.
ZhuWen, ZhouChangquan, LiCong, et al. Study on influence of atmospheric corrosionon steel structure of Baiyang Yangtze River Bridge[J]. Journal of Chinese and Foreign Highway, 2021, 41(4): 101-105.
LiuPuyuan. Study on the stable bearing capacity and collapse resistance of steel pipe piles after corrosion in marine environment[D]. Harbin: Harbin Institute of Technology, 2022.
[5]
MorcilloM, DíazI, CanoH, et al. Atmospheric corrosion of weathering steels. Overview for engineers. Part I: Basic concepts[J]. Construction and Building Materials, 2019, 213: 723-737.
[6]
GuoX Y, KangJ F, ZhuJ S, et al. Corrosion behavior and mechanical property degradation of weathering steel in marine atmosphere[J]. Journal of Materials in Civil Engineering, 2019, 31(9): 04019181.
[7]
GuoQ, WuZ Y, XingY, et al. Corrosion evolution and mechanical property deterioration of Q355NH weathering steel in long-term neutral salt spray environment[J]. Construction and Building Materials, 2024, 411: 134193.
[8]
KongZ Y, JinY, HossenG M S, et al. Experimental and theoretical study on mechanical properties of mild steel after corrosion[J]. Ocean Engineering, 2022, 246: 110652.
ZengLang, CaiCan, LiaoFeilong, et al. Mechanical strength and fatigue performanceof offshore derricks after corrosion[J]. Science Technology and Engineering, 2024, 24(35): 14911-14920.
[11]
ZongL, LiuH, WangJ X, et al. Experimental and numerical investigation on mechanical and fatigue performance of corroded Q690D high-strength steel[J]. Thin-Walled Structures, 2024, 195: 111466.
[12]
ZhangY, ZhengK F, ZhuJ, et al. Research on corrosion and fatigue performance of weathering steel and high-performance steel for bridges[J]. Construction and Building Materials, 2021, 289: 123108.
ZhangSumei, ChenGuangrui, LiAidong, et al. Experimental study on stress corrosion characteristics of steel Q420qD[J]. Journal of Building Science and Engineering, 2022, 39(1): 55-64.
ZhangYing, YangKun, YuLiusi, et al. Fatigue performance of offshore derricks after corrosion[J]. Science Technology and Engineering, 2022, 22(7): 2563-2572.
YuYujie, LuoYongqi, SunHongbin, et al. Evolution of stress corrosion in Q370qENH weathering steel under marine atmospheric conditions[J]. Journal of Building Materials, 2023, 26(12): 1271-1278.
HanGeng, WangJia. Research progress on theperformance of stainless steel structures under corrosion-load coupling effects[J]. Transportation Science and Engineering, 2025, 41(1): 30-40.
National Technical Committee on Steel of Standardization Administration of China. Metallic materials—tensile testing—Part 1: method of test at room temperature: GB/T 228.1—2021[S]. Beijing: Standards Press of China, 2021.
[23]
ChenJ, ShaoY S, GuoL H, et al. Mechanical properties of corroded high strength low alloy steel plate[J]. Journal of Constructional Steel Research, 2020, 172: 106160.
[24]
国际标准化组织. 人造环境中的腐蚀试验-盐雾试验: ISO 9227—2017[S]. 日内瓦: 国际标准化组织(ISO), 2017.
[25]
International Organization for Standardization. Corrosion tests in artificial atmospheres — Salt spray tests: ISO 9227: 2017[S]. Geneva: International Organization for Standardization, 2017.
ASTM International. Standard Practice for Preparing,Cleaning, and Evaluating Corrosion Test Specimens: ASTM G1-03[S]. West Conshohocken: ASTM International, 2003.