150Mn20Al10奥氏体基低密度钢的流动海水腐蚀性能研究  

A Study of the Corrosion Properties of 150Mn20Al10 Austenite Lowdensity Steel in the Flowing Seawater

作　　者：江雁 桂在涛 杨凯 张宁飞 JIANG Yan;GUI Zaitao;YANG Kai;ZHANG Ningfei(Special Steel Business Unit Zhongba Factory,Nanjing Iron and Steel Co.,Ltd,Nanjing 211500,China;Mold Workshop Department,Quanfeng Automotive Precision Technology(Anhui)Co.,Ltd,Maanshan 243032,China;School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,China)

机构地区：[1]南京钢铁股份有限公司特钢事业部中棒厂,江苏南京211500 [2]泉峰汽车精密技术(安徽)有限公司模具车间部门,安徽马鞍山243032 [3]安徽工业大学冶金工程学院,安徽马鞍山243032

出　　处：《安徽工业大学学报（自然科学版）》2024年第1期25-36,共12页Journal of Anhui University of Technology（Natural Science）

基　　金：国家自然科学基金项目(51674004)。

摘　　要：针对奥氏体基低密度钢在真空感应熔炼中极易出现的晶粒长大等缺陷对其腐蚀性能产生不利的影响,以真空感应熔炼奥氏体基低密度钢150Mn20Al10(20%Mn,10%Al和1.5%C,质量分数)为研究对象,采用电渣重熔对感应熔炼铸坯进行重熔,并对电渣重熔前后的铸坯进行锻造。采用正交试验方案对真空感应熔炼锻棒、真空感应熔炼锻板和电渣重熔锻板3种试样进行海水模拟腐蚀试验,研究海水流速、腐蚀时间、pH和生产工艺等因素对钢150Mn20Al10海水腐蚀增重的影响;采用扫描电子显微镜(SEM)、能量色散谱仪(EDS)和X射线光电子能谱仪(XPS)对钢150Mn20Al10的宏微观形貌、组织结构及腐蚀产物进行表征分析。结果表明:影响真空感应熔炼锻棒、真空感应熔炼锻板和电渣重熔锻板腐蚀增重的主次因素为流速>时间>pH>生产工艺;相同海水流速条件下,电渣重熔锻板表面存在较多的Al_(2)O_(3),Fe_(3)O_(4)等产物,耐蚀性能优于真空感应熔炼锻棒和锻板;3种试样均以均匀腐蚀为主,局部发生少量的点蚀,电渣重熔锻板在流动海水腐蚀过程中的腐蚀速率比真空感应熔炼锻棒和锻板小,点蚀敏感性比真空感应熔炼锻板和锻棒弱。In response to the adverse effects of grain growth and other defects on the corrosion performance of austenite based low density steel during vacuum induction melting,the vacuum induction melting of austenite low-density steel 150Mn20Al10(20%Mn,10%Al and 1.5%C,mass fraction,the same below)was used as the research object.The induction melting ingot was remelted using electro-slag remelting,and the ingot before and after electro-slag remelting was forged.The seawater simulated corrosion tests were conducted on three types of samples,such as vacuum induction melting forged rod,vacuum induction melting forged plate,and electro-slag remelting forged plate by an orthogonal experimental scheme.The effects of seawater flow rate,corrosion time,pH,and production process on the seawater corrosion weight increase of steel 150Mn20Al10 were studied.Subsequently,the scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),and X ray photo-electron spectroscopy(XPS)were used to characterize and analyze the macroscopic and microscopic morphology,micro-structure,and corrosion products of austenite low-density steel 150Mn20Al10.The results indicate that the primary and secondary factors affecting the increase of corrosion weight of induction melting forged rod,induction melting forged plate,and electro-slag remelting forged plate are flow rate,time,pH and materials.Under the same flow rate conditions,there are many products such as Al2O3 and Fe3O4 on the surface of electro-slag remelting forged plate,resulting in better corrosion properties than induction melting forged rod and plate.Three types of samples mainly exhibit uniform corrosion,with a small amount of pitting corrosion occurring locally,and the corrosion rate of electro-slag remelting forged plate during the corrosion process of flowing seawater is lower than that of induction melting forged rod and forged plate,and the sensitivity to pitting corrosion is weaker than that of induction melting forged plate and forged rod.

关 键 词：奥氏体基低密度钢 流动海水腐蚀 腐蚀性能 腐蚀机理 

分 类 号：TG174.2[金属学及工艺—金属表面处理]