Ce对2101双相不锈钢析出相和耐蚀性能的影响  

Effect of Cerium on Precipitated Phase and Corrosion Resistance of 2101 Duplex Stainless Steel

作　　者：杨朔 龚伟 王鹏飞 姜周华 YANG Shuo;GONG Wei;WANG Peng-fei;JIANG Zhou-hua(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《稀土》2024年第5期17-24,I0003,共9页Chinese Rare Earths

基　　金：国家自然科学基金项目(U190822);中央高校基本科研业务专项基金项目(N2125038)。

摘　　要：2101双相不锈钢因具有铁素体良好的力学性能和奥氏体优异的耐蚀性能而应用广泛。由于钢中存在特殊的双相结构,在热加工过程中容易出现二次相析出而降低钢的耐腐蚀性能。本文利用电子显微镜、XRD相分析和电化学工作站等方法,研究了稀土Ce对时效态2101双相不锈钢析出相和耐蚀性能的影响。研究结果表明,添加Ce后,钢中夹杂物的类型由Al_(2)O_(3)逐渐转变为CeAlO_(3)、Ce_(2)O_(2)S、Ce_(2)O_(3)以及少量的CeS;稀土固溶在晶界能够有效抑制二次析出相的生成,电化学阻抗谱也表明Ce的加入能够提高钢的容抗弧,提高耐蚀性能。且稀土变质钢中夹杂物,使金属阳极钝化,形成致密的钝化膜,进一步阻碍点蚀的发生。2101 duplex stainless steel is widely used because of its good mechanical properties of ferrite and excellent corrosion resistance of austenite.Due to the special dual-phase structure in steel,it is easy to cause secondary phase precipitation during hot working and reduce the corrosion resistance of steel.The effect of rare earth Ce on precipitated phase and corrosion resistance of aged 2101 duplex stainless steel was studied by means of electron microscope,XRD phase analysis and electrochemical workstation.The results show that the type of inclusions in the steel gradually changes from Al_(2)O_(3) to CeAlO_(3),Ce_(2)O_(2)S,Ce_(2)O_(3) and a small amount of CeS;Rare earth solution at grain boundaries can effectively inhibit the formation of secondary precipitates.Electrochemical impedance spectroscopy also shows that the addition of rare earth can improve the capacitive arc resistance and corrosion resistance of steel.Rare earth modifies the inclusions in steel,which passivates the metal anode and forms a dense passivation film,which further hinders the occurrence of pitting corrosion.

关 键 词：2101双相不锈钢 Ce处理 稀土夹杂物 氮化铬 耐蚀性能 

分 类 号：TG142.13[一般工业技术—材料科学与工程]