组织类型对Ti-Mo高强钢耐蚀性能的影响  

Effects of microstructure type on corrosion resistance of Ti-Mo high strength steel

作　　者：杨洪波[1] 赵贺然 李小琳 杜金晶[1] 邵明增[1] 亓伟伟 YANG Hongbo;ZHAO Heran;LI Xiaolin;DU Jinjing;SHAO Mingzeng;QI Weiwei(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,Shaanxi,China;Technical Center,Laiwu Branch of Shandong Iron and Steel Co.,Ltd.,Jinan 271100,Shandong,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072 [3]山东钢铁股份有限公司莱芜分公司技术中心,山东济南271100

出　　处：《钢铁研究学报》2024年第11期1491-1498,共8页Journal of Iron and Steel Research

基　　金：陕西省自然科学基础研究计划资助项目(2021JM369)。

摘　　要：利用周期浸润腐蚀试验机、电化学工作站测试了Ti-Mo高强钢的耐蚀性能,结合光学显微镜、X射线衍射仪、扫描电子显微镜、原子力显微镜的检测结果探讨了组织类型对耐蚀性能的影响规律。结果表明:随着实验钢中珠光体与贝氏体比例的降低,锈层生长速度减慢,内锈层厚度占比提高,锈层的致密程度以及与材料的结合能力得到改善,腐蚀失重率下降;裸钢的自腐蚀电流密度下降,电荷转移电阻增强,耐蚀性能提升。测量了实验钢的微观组织电位,铁素体电位高于贝氏体/珠光体电位。由于不同组织之间会形成微观腐蚀电池,电偶腐蚀强度是影响实验钢腐蚀速率的主要因素;减少Ti-Mo高强钢中贝氏体/珠光体的体积分数,可以改善组织均匀性,抑制电偶腐蚀,提高耐蚀性能。The corrosion resistance of Ti-Mo microalloyed steel was evaluated using the cyclic immersion corrosion testing machine and electrochemical workstation.The experiments combined the results from the optical microscope,X-ray diffractometer,scanning electron microscope,and atomic force microscope to discuss the influence factors of microstructure type on corrosion resistance.The results show that with the decrease of the proportion of pearlite and bainite in the investigated steel,the growth rate of the rust layer slows down,the proportion of the inner rust layer increases,the compactness of the rust layer and the bonding ability with the iron matrix are improved,and the corrosion weight loss rate decreases.At the same time,the self-corrosion current density of bare steel decreases,the charge transfer resistance increases,and the corrosion resistance improves.The microstructure potential of the investigated steel was measured,and the ferrite potential was higher than that of bainite and pearlite.As a microscopic corrosion cell was formed between the structures,the galvanic corrosion strength is the main factor affecting the corrosion rate.That is to say,reducing the volume fraction of bainite/pearlite in Ti-Mo high strength steel can improve microstructure uniformity,suppress galvanic corrosion,and enhance corrosion resistance.

关 键 词：Ti-Mo钢 显微组织 耐蚀性能 锈层 电偶腐蚀 

分 类 号：TG142.1[一般工业技术—材料科学与工程]