| 摘要: |
| 采用周期性干湿交替盐雾加速腐蚀试验来模拟海洋性大气腐蚀环境，研究了应力作用下Q370qENH耐候钢的腐蚀速率、锈层发育与物相组成、锈坑形貌以及损伤拉伸性能.结果表明：相较于无应力腐蚀，应力腐蚀显著提升了Q370qENH表面的腐蚀活性，加快了Q370qENH的腐蚀，同时在一定程度上延缓了稳定性锈层的生成，并进一步削减了Q370qENH的强度；无论是否存在应力，Q370qENH在盐雾环境中最后均未生成较为稳定的锈层保护层；在高氯海洋性大气腐蚀环境中，Q370qENH并未表现出优越的抗腐蚀性能，不建议免涂装使用；Q370qENH腐蚀后的各项性能仍处于较高水平. |
| 关键词: 耐候钢 Q370qENH 应力腐蚀 锈层形貌 静力拉伸 |
| DOI：10.3969/j.issn.1007-9629.2023.12.005 |
| 分类号:U24;TG172.3 |
| 基金项目:国家自然科学基金资助项目（52278231）；山东省交通运输行业重点科研项目（2021-MS4-097）；山东省交通运输厅科技计划（2021B103）；湖南省自然科学基金资助项目（2022JJ20073） |
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| Stress Corrosion Evolution of Q370qENH Weathering Steel in Marine Atmosphere Environment |
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YU Yujie1,2, LUO Yongqi1, SUN Hongbin3, HU Chunjian1, ZHU Zhihui1,2
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1.School of Civil Engineering， Central South University， Changsha 410075， China;2.National Engineering Research Center of High-Speed Railway Construction Technology， Central South University， Changsha 410075， China;3.Shandong Railway Investment Holding Group Company Limited， Jinan 250102， China
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| Abstract: |
| The corrosion resistance of Q370qENH weathering steel was investigated by using periodic dry/wet alternating salt spray accelerated corrosion tests to simulate marine atmospheric corrosion environment. A comprehensive analysis was performed with analyzing the corrosion rate, rust layer development and phase composition, rust pit morphology and damage tensile property, including corrosive mechanism and characterization. The results show that compared with stress free corrosion, the stress corrosion can significantly improve the corrosion activity of Q370qENH’s surface, thus speeding up the corrosion rate, delaying the formation of stable rust layer to a certain extent and further reducing Q370qENH’s strength. However, no matter whether there is stress or not, the stable protective layer is not formed in the salt spray environment. Q370qENH does not show excellent corrosion resistance in high chloride atmosphere, in which corrosion environment, Q370qENH is not recommended to be used without coating. But Q370qENH still presents a good mechanical properties when with a high level of corrosion. |
| Key words: weathering steel Q370qENH stress corrosion morphology of rust layer static tension |
