高海拔寒区桥梁耐候钢耐蚀机制原位腐蚀试验研究

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中图分类号：U444 文献标志码：A 文章编号：2096-6717（2025）04-0078-10

In-situ corrosion test study on corrosion resistance mechanism of weathering steel for bridges in high-altitude cold regions

YANG Yingfang1²，LI Yapeng1，ZHANG Yiqian1，YAN Ji'，CUI Chuang oolof Civil Engineering，Southwest Jiaotong University，Chengdu 6lOo31，P.R.China; 2.Central Research Institute of Building and Construction Co.，Ltd.MCC Group，Beijing lOoo88，P.R.China）

Abstract：Weathering steelis 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 stel were used as research objects.In-situ corrosion tests of bridge steel were caried out in typical high-altitude cold areas to explore the feasibility of applying weathering steel in high-altitude cold areas.Firstly，2O in-situ corosion specimens were designed according to the specifications，and in-situ corrosion tests with corrosioncycles of 2，4，1O，18and 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 highaltitude 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 1O 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 iner rust layer of weathering steel，causing the inner rust layer to become denser in subsequent corrosion， further enhancing the corrosion resistance.

Keywords： high-altitude cold regions；weathering steel；corrosion test；corrosion resistance performance; electron microscopy analysis

当前交通基础设施建设正在向“上山下海”阶段发展，对于高原等典型“上山"场景而言，高海拔寒区具有低温、腐蚀等恶劣的运营环境，因此，发展耐候、轻量化、装配式及环境友好型的桥梁结构，是解决高原山区交通基础设施建设难题的有效途径[1-4]。（剩余14718字）