为了研究耐候H型钢在不同冷却工艺下的基体组织类型对其耐大气腐蚀性能的影响，对耐候H型钢热轧结束后采用轧后空冷、轧后随炉冷及轧后水冷3种冷却方式，分别获得了铁素体+贝氏体、铁素体+珠光体及全贝氏体3种不同的基体组织。利用周期浸润试验模拟了不同基体组织类型的耐候H型钢在大气环境中的腐蚀行为。对腐蚀后的带锈试样进行了失重分析及电化学试验来评价其腐蚀性能，采用电子探针(EPMA)观察分析其腐蚀产物形貌及锈层截面元素分布并利用X射线衍射(XRD)分析其腐蚀产物物相组成来探究其影响。结果表明：在腐蚀初期，轧后水冷获得的单相贝氏体组织的锈层最为致密完整且其耐大气腐蚀性能最优；在腐蚀后期，不同显微组织的耐腐蚀性能大致相同。
In order to study the influence of H-beam weathering steel microstructures formed with various cooling processes on the atmospheric corrosion resistance, H-beam weathering steel after hot-rolling were cooled down with three methods of air cooling, furnace cooling and water cooling, and three kinds of microstructures, ferrite + bainite, ferrite + pearlite and bainite, were obtained respectively. In addition, alternate immersion test was used to study the corrosion behavior of weathering steel with different microstructures in atmospheric environment. The corrosion performance of samples with rust after corrosion were evaluated by weightlessness analysis and electrochemical experiments. Moreover, the morphology of the corrosion products and the distribution of the rust layer elements were analyzed, and the phase composition of the corrosion products was analyzed by XRD. Results showed that at the initial stage of corrosion, the rust layer of single-phase bainitic microstructure was the most compact, and its atmospheric corrosion resistance was the best; at the later stage of corrosion, the corrosion resistance of weathering steels with different microstructures was roughly the same.
