445J2超纯铁素体不锈钢和316L超低碳奥氏体不锈钢在溴化锂溶液的点蚀分析  

Pitting Erosion Analysis of Ultra-Pure Ferritic Stainless Steel 445J2 and 316L Ultra-Low-Carbon Austenitic Stainless Steel in Lithium Bromide Solution

作　　者：武卓杰 侯利锋[1,3] 杜华云 邹勇[2] 武敏 范光伟 卫英慧 Wu Zhuojie;Hou Lifeng;Du Huayun;Zou Yong;Wu Min;Fan Guangwei;Wei Yinghui(College Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024;Shanxi Stainless Steel Co.,Ltd.,Taiyuan 030003;Shanxi Province Metal Material Corrosion and Protection Engineering Technology Research Center,Taiyuan 030024)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]山西不锈钢股份有限公司,太原030003 [3]山西省金属材料腐蚀与防护工程技术研究中心,太原030024

出　　处：《特殊钢》2023年第1期65-71,共7页Special Steel

基　　金：中央引导地方科技发展专项资金项目(YDZX20191400002094);山西省科技重大专项(20191102006)资助。

摘　　要：445J2铁素体不锈钢由于高的导热率、低的热膨胀系数以及良好的耐蚀性能使得其作为溴冷机中一些部件的良好候选材料,本文采用电化学测试方法对比研究了445J2超纯铁素体不锈钢(/%:0.01C,22.5Cr,1.9Mo,0.27Nb,0.20Ti,0.09Al,0.36Cu,0.015P,0.001S,0.015N)和316L奥氏体不锈钢(/%:0.002C,16.8Cr,10.19Ni,2.02Mo,0.025P,0.0008S)在20~60℃0.1~1M的溴化锂溶液中的点蚀行为,并采用扫描电镜(SEM)和能谱分析仪(EDS)对电化学结果进行表征。结果表明,随着LiBr温度和浓度的升高,两种钢腐蚀电流密度增大,点蚀电位降低,耐点蚀性变差;氧化物和硫化物夹杂会引起两种钢的点蚀;高含量的Cr以及Mo、Ti、Nb、Al等合金元素使445J2钢具有优异的耐点蚀性能。The high thermal conductivity,low coefficient of thermal expansion and good corrosion resistance of 445 J2 ferritic stainless steel make it being a good candidate for some parts in the bromine cooler.The pitting corrosion behaviors of 445 J2 ultrapure ferritic stainless steel(/%:0.01 C,22.5 Cr,1.9 Mo,0.27 Nb,0.20 Ti,0.09 Al,0.36 Cu,0.015 P,0.001 S,0.015 N)and 316 L austenitic stainlesssteel(/%:0.002 C,16.8 Cr,10.19 Ni,2.02 Mo,0.025 P,0.0008 S)in 0.1-1 M lithium bromide solutions at 20-60℃are studied by electrochemical test method.The electrochemical results are characterized by scanning electron microscopy(SEM)and energy dispersive analyzer(EDS).The results show that with the increase of LiBr temperature and concentration,the corrosion current density of the two steels increases,the pitting corrosion potential decreases,and the pitting corrosion resistance deteriorates;oxide and sulfide inclusions can cause pitting corrosion of the two steels;High content of Cr and alloying elements such as Mo,Ti,Nb,Al make 445 J2 steel have excellent pitting resistance.

关 键 词：445J2超纯铁素体不锈钢 316L超低碳奥氏体不锈钢 点蚀 溴化锂 

分 类 号：TG142.71[一般工业技术—材料科学与工程]