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

doi:10.20057/j.1003-8620.2022-00069

Special Steel ›› 2023, Vol. 44 ›› Issue (1): 65-71.DOI: 10.20057/j.1003-8620.2022-00069

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

Wu Zhuojie^1,3, Hou Lifeng^1,3, Du Huayun^1,3, Zou Yong², WuMin², Fan Guangwei², Wei Yinghui^1,3

1 College Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024;
2 Shanxi Stainless Steel Co.,Ltd.,Taiyuan 030003;
3 Shanxi Province Metal Material Corrosion and Protection Engineering Technology Research Center,Taiyuan 030024

Received:2022-07-12 Online:2023-02-01 Published:2023-01-31

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

武卓杰^1,3,侯利锋^1,3,杜华云^1,3,邹勇²,武敏²,范光伟²,卫英慧^1,3

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

通讯作者: 通讯作者：侯利锋(1978-),女，教授； E-mail::houlieng78@126.com
作者简介:武卓杰(1997-),男，硕士研究生(太原理工大学);
基金资助:
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

Abstract

Abstract: The high thermal conductivity,low coeffcient of thermal expansion and good corrosion resistance of 445J2 ferrit- ic stainless steel make it be a good candidate for some parts in the bromine cooler. The pitting corrosion behaviors of 445J2 ultrapure ferritic stainless steel(/%:0.01C,22.5Cr,1.9Mo,0.27Nb,0.20Ti,0.09Al,0.36Cu,0.015P, 0.001S,0.015N)and 316L austenitic stainless steel(/%:0.002C,16.8Cr,10. 19Ni,2.02Mo,0.025P,0.0008S)in 0.1- 1M 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 445J2 steel have excellent pitting resistance.

Key words: 445J2 Ultra-Pure Ferritic Stainless Steel;316L Ultra-Low-Carbon Austenitic Stainless Steel, Fitting Corrosion Lithium Bromide

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。

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

Wu Zhuojie, Hou Lifeng, Du Huayun, Zou Yong, WuMin, Fan Guangwei, Wei Yinghui, . Pitting Erosion Analysis of Ultra-Pure Ferritic Stainless Steel 445J2 and 316L Ultra-Low-Carbon Austenitic Stainless Steel in Lithium Bromide Solution[J]. Special Steel, 2023, 44(1): 65-71.

武卓杰, 侯利锋, 杜华云, 邹勇, 武敏, 范光伟, 卫英慧. 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[J]. 特殊钢, 2023, 44(1): 65-71.

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

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

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