中性盐雾条件下Q370qENH耐候钢腐蚀特征及力学性能研究

朱志辉; 王翔宇; 陈全; 季敏; 陈钊; 严琨; 冯乾朔

doi:10.19713/j.cnki.43-1423/u.T20251518

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中性盐雾条件下Q370qENH耐候钢腐蚀特征及力学性能研究

桥梁隧道与结构 | 更新时间：2026-07-24

- 中性盐雾条件下Q370qENH耐候钢腐蚀特征及力学性能研究
- Corrosion characteristics and mechanical properties of Q370qENH weathering steel under neutral salt spray conditions
- 铁道科学与工程学报 2026年23卷第7期页码：3445-3456
- 作者机构：
  
  1.中南大学土木工程学院，湖南长沙 410075
  2.招商局公路网络科技控股股份有限公司，北京 100022
  3.广西桂梧高速公路桂阳段投资建设有限公司，广西桂林 541907
  4.招商局重庆交通科研设计院有限公司，重庆 400074
  5.河北科技工程职业技术大学建筑工程系，河北邢台 054000
- 作者简介：
  
  冯乾朔(1995—)，男，河北邢台人，讲师，博士，从事桥梁钢结构研究；E-mail：fengqianshuo@hevute.edu.cn
- 基金信息：
  
  国家重点研发计划(2022YFB2603301);中国国家铁路集团有限公司科技研究开发计划(N2023G047);河北省自然科学基金资助项目(E2025108006)
- DOI：10.19713/j.cnki.43-1423/u.T20251518
  中图分类号： U24;TG172
- 收稿：2025-09-28，
  
  网络首发：2026-07-24，
  
  纸质出版：2026-07-28
- 稿件说明：
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朱志辉,王翔宇,陈全等.中性盐雾条件下Q370qENH耐候钢腐蚀特征及力学性能研究[J].铁道科学与工程学报,2026,23(07):3445-3456.

ZHU Zhihui,WANG Xiangyu,CHEN Quan,et al.Corrosion characteristics and mechanical properties of Q370qENH weathering steel under neutral salt spray conditions[J].Journal of Railway Science and Engineering,2026,23(07):3445-3456.
朱志辉,王翔宇,陈全等.中性盐雾条件下Q370qENH耐候钢腐蚀特征及力学性能研究[J].铁道科学与工程学报,2026,23(07):3445-3456. DOI： 10.19713/j.cnki.43-1423/u.T20251518.

ZHU Zhihui,WANG Xiangyu,CHEN Quan,et al.Corrosion characteristics and mechanical properties of Q370qENH weathering steel under neutral salt spray conditions[J].Journal of Railway Science and Engineering,2026,23(07):3445-3456. DOI： 10.19713/j.cnki.43-1423/u.T20251518.

摘要

耐候钢凭借优异的耐蚀性能，在桥梁工程中得到广泛应用，但其在腐蚀环境下的长期服役力学性能演化规律仍需系统阐明。目前，耐候钢与普通钢在腐蚀条件下力学性能劣化行为的对比研究尚显不足，制约了免涂装耐候钢桥梁的寿命评估与推广应用。为此，以Q370qENH耐候钢和Q370q普通钢为研究对象，开展中性盐雾干湿循环加速腐蚀试验，并在室温条件下进行单轴拉伸试验，获取2种钢材的应力-应变曲线以及强度与延性指标。结合三维表面扫描与数字图像相关技术(digital image correlation

DIC)，系统表征不同腐蚀周期下试样的腐蚀形貌及锈坑分布特征。研究结果表明：随着腐蚀时间延长，Q370qENH耐候钢表面逐步形成致密连续的保护锈层，腐蚀分布更均匀，该锈层有效缓解锈坑深度不均所引起的应力集中，进而延缓强度与延性的退化；经历30个加速腐蚀周期后，Q370qENH耐候钢的屈服强度和抗拉强度分别下降4.84%和2.72%，降幅显著低于Q370q普通钢，表现出更优异的耐腐蚀性；基于此，系统揭示Q370qENH耐候钢在腐蚀环境下的力学性能衰减规律，建立其力学性能衰减模型，从而为耐候钢桥梁的长期性能评估与耐久性设计提供理论依据；在断裂特征方面，腐蚀后耐候钢主要表现出显著的脆性断裂特征，而普通钢仍以韧性断裂为主。研究结果对推动免涂装耐候钢桥梁的工程应用与发展具有重要的指导意义。

Abstract

Weathering steel has been widely used in bridge structures due to its excellent corrosion resistance. However

the evolution of its long-term service mechanical properties in corrosive environments requires systematic clarification. Current comparative studies on the deterioration of the mechanical properties of weathering steel and normal steel under corrosive conditions are insufficient

limiting the evaluation of the life and application of uncoated weathering steel bridges. Therefore

accelerated corrosion tests were conducted on Q370qENH weathering steel and Q370q normal steel under neutral salt spray dry-wet cyclic conditions

followed by room-temperature uniaxial tensile tests to obtain stress-strain curves

as well as strength and ductility indicators. The corrosion morphology and rust pit distribution characteristics of samples under different corrosion cycles were systematically characterized using three-dimensional surface scanning and digital image correlation (DIC) technology. The results show that as corrosion time increases

a dense and continuous protective rust layer progressively forms on the surface of Q370qENH weathering steel

with a uniform corrosion distribution. The rust layer can effectively minimize stress concentration caused by uneven corrosion depth and rust pits

thereby delaying the degradation of strength and ductility. After 30 accelerated corrosion cycles

the yield strength and tensile strength of weathering steel can decrease by 4.84% and 2.72%

respectively

which is significantly lower than those of Q370q normal steel

indicating better corrosion resistance. The attenuation law of the mechanical properties of Q370qENH weathering steel in corrosive environments is clarified

and the corresponding attenuation model of mechanical properties is established

providing a theoretical basis for the long-term performance evaluation and durability design of weathering steel bridges. In terms of fracture characteristics

post-corrosion weathering steel can predominantly exhibit brittle fracture

whereas normal steel shows predominantly ductile fracture. The research results have significant implications for promoting the technical application and development of uncoated weathering steel bridges.

关键词

Keywords

references

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