针对钢-混凝土组合梁表面复合涂层在风沙环境中发生冲蚀损伤劣化的问题,制作了两种钢基体复合涂层试件,采用气流挟沙喷射法,研究了风沙侵蚀下复合涂层的冲蚀磨损特征,基于Bitter冲蚀理论建立了复合涂层的冲蚀损伤计算模型,并应用计算流体力学(CFD)的方法和试验数据对该模型进行了验证。结果表明:聚氨酯面漆与环氧云铁中间漆的抗冲蚀性能相近,二者主要起抗风沙冲蚀的作用;当冲蚀角度为60°时,复合涂层的冲蚀磨损量最大,其冲蚀特性介于塑性材料与脆性材料之间,且仿真值与试验值较为接近,验证了该模型的可靠性。

Aiming at the problem of erosion damage and deterioration of the composite coating on surface of steel-concrete composite beam in sandstorm environment, two kinds of steel matrix composite coating specimens were made. The erosion wear characteristics of composite coating under wind-sand erosion were studied by air-flow sand-carrying jet method. Based on the Bitter erosion theory, the erosion damage calculation model of composite coating was established, and the model was verified by computational fluid dynamics (CFD) method and test datas. The results showed that the erosion resistance of polyurethane topcoat and epoxy micaceous iron intermediate paint was similar, and they mainly played the role of anti-sand erosion. When the erosion angle was 60 °, the erosion wear amount of composite coating was the largest, and its erosion characteristics were between plastic materials and brittle materials. The simulation value was close to the experimental value, which verified the reliability of the model.