耐候H型钢耐大气腐蚀性能的研究  

Study on the Atmospheric Corrosion Resistance of H-Beam Weathering Steel

作　　者：闫婷 高秀华[1] 韩蕾蕾 吴红艳[1] 杜林秀[1] 李通 YAN Ting;GAO Xiu-hua;HAN Lei-lei;WU Hong-yan;DU Lin-xiu;LI Tong(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Technical Center,Shandong Laiwu Iron&Steel Incorporation,Laiwu 271104,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]山东莱芜钢铁股份有限公司技术研发中心,山东莱芜271104

出　　处：《材料保护》2021年第2期27-32,33,共7页Materials Protection

基　　金：国家高技术研究发展计划(2015AA03A501)资助。

摘　　要：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.

关 键 词：耐候钢 大气腐蚀 冷却工艺 显微组织 腐蚀速率 极化曲线 

分 类 号：TG174.31[金属学及工艺—金属表面处理]