土木与环境工程学报（中英文）2025，Vol.47Issue(4)：78-87,10.DOI:10.11835/j.issn.2096-6717.2024.125
高海拔寒区桥梁耐候钢耐蚀机制原位腐蚀试验研究
In-situ corrosion test study on corrosion resistance mechanism of weathering steel for bridges in high-altitude cold regions
摘要
Abstract
Weathering steel is suitable for bridge construction in harsh environmental areas such as high-altitude cold areas,but the current corrosion resistance mechanism of weathering steel in high-altitude cold areas is unclear.To reveal it,typical bridge weathering steel and ordinary steel were used as research objects.In-situ corrosion tests of bridge steel were carried out in typical high-altitude cold areas to explore the feasibility of applying weathering steel in high-altitude cold areas.Firstly,20 in-situ corrosion specimens were designed according to the specifications,and in-situ corrosion tests with corrosion cycles of 2,4,10,18 and 24 months were carried out;combined with corrosion weight loss data,rust layer macromorphology and micromorphology,the distribution of elements along the rust layer,the corrosion resistance mechanism of weathering steel in high-altitude cold areas was analyzed.The research results show that the corrosion loss of the two specimens in Kangding atmospheric environment is basically the same before the corrosion cycle is 10 months;when the corrosion cycle is 24 months,the corrosion loss of weathering steel is about 10%lower than that of ordinary carbon steel;the goethite formed in the rust products of weathering steel hinders the accumulation of oxygen,moisture,etc.in the rust layer,further preventing its corrosion;during the corrosion process,Cr is enriched in the inner rust layer of weathering steel,causing the inner rust layer to become denser in subsequent corrosion,further enhancing the corrosion resistance.关键词
高海拔寒区/耐候钢/腐蚀试验/耐蚀性能/电镜分析Key words
high-altitude cold regions/weathering steel/corrosion test/corrosion resistance performance/electron microscopy analysis分类
交通工程引用本文复制引用
杨颖芳,李亚鹏,张谊千,严基,崔闯..高海拔寒区桥梁耐候钢耐蚀机制原位腐蚀试验研究[J].土木与环境工程学报（中英文）,2025,47(4):78-87,10.基金项目
国家重点研发计划(2022YFB3706400) National Key Research and Development Program of China(No.2022YFB3706400) （2022YFB3706400）
