热处理对硝酸熔盐中347H不锈钢腐蚀行为的影响

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (5): 1-9.

• 材料科学与工程 • 下一篇

热处理对硝酸熔盐中347H不锈钢腐蚀行为的影响

唐梦兰^*1, 王军^2,3, 刘天增⁴, 李俊琛^2,3, 冯力^2,3

1.中国航发中传机械有限公司, 湖南长沙 410200;
2.兰州理工大学材料科学与工程学院, 甘肃兰州 730050;
3.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050;
4.酒钢集团不锈钢研究所, 甘肃嘉峪关 735100

收稿日期:2021-04-15 出版日期:2021-10-28 发布日期:2021-11-18
通讯作者: 唐梦兰(1987-),女,湖南衡阳人,工程师.Email:fenglils@lut.edu.cn
基金资助:
国家重点研发计划(2016YFE0111400)

Effect of heat treatment on the corrosion behavior of 347H stainless steel in molten nitrate salt

TANG Meng-lan¹, WANG Jun^2,3, LIU Tian-zeng⁴, LI Jun-chen^2,3, FENG Li^2,3

1. China Aviation Development Zhongchuan Machinery Co., Ltd.,Changsha 730050, China;
2. College of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
3. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. Of Tech., Lanzhou 730050, China;
4. Jiuquan Steel Group Stainless Steel Institute, Jiayuguan 735100, China

Received:2021-04-15 Online:2021-10-28 Published:2021-11-18

摘要/Abstract

摘要： 利用静态熔盐浸泡实验,研究了不同晶粒度的347H不锈钢在565 ℃混合硝酸熔盐(60%NaNO₃+40%KNO₃)中长达120 h的腐蚀行为.通过增重法绘制腐蚀动力学曲线,并研究347H不锈钢的表面腐蚀产物、物相、腐蚀表面微区成分,解释347H不锈钢在硝酸熔盐中的腐蚀机理.结果表明:经过固溶处理调控晶粒度的347H不锈钢在熔盐腐蚀中腐蚀速率有所降低,腐蚀动力学曲线变为线性增长趋势.通过XRD检测得到,347H不锈钢在硝酸熔盐中的腐蚀产物主要是Fe₂O₃和少量的Fe₃O₄及NaFeO₂.Fe₃O₄,结构致密,能有效减小硝酸熔盐对钢基体的腐蚀,导致347H不锈钢在腐蚀后期质量损失有所降低.腐蚀产物形貌和横截面厚度分析结果表明,经过1 160 ℃固溶处理1 h后不锈钢晶粒度达到7级时,腐蚀层厚度达到最低为0.661 μm,此时347H不锈钢在硝酸熔盐中的耐腐蚀性达到最好.

关键词: 热处理, 347H不锈钢, 硝酸熔盐, 腐蚀行为

Abstract: In this paper, a static molten salt immersion experiment is used to study the corrosion behavior of 347H stainless steel with different grain sizes in mixed nitrate molten salt (60%NaNO₃+40%KNO₃) at 565 ℃ for up to 120 h. The corrosion kinetic curve is drawn by the weight gain method, the surface corrosion products and phases of 347H stainless steel are studied, and the micro-area composition of the corroded surface is analyzed to explain the corrosion mechanism of 347H stainless steel in nitrate molten salt. The results show that the corrosion rate of 347H stainless steel whose grain size is adjusted by solution treatment decreases during molten salt corrosion, and the corrosion kinetics curve becomes a linear growth trend. Through XRD detection, the corrosion products of 347H stainless steel in molten nitrate salt are mainly Fe₂O₃ and a small amount of Fe₃O₄ and NaFeO₂. Fe₃O₄ has a compact structure, which can effectively reduce the corrosion of nitrate molten salt to the steel matrix, resulting in a decrease in the quality loss of 347H stainless steel in the later stage of corrosion. The results of corrosion product morphology and cross section thickness analysis show that the corrosion layer thickness of 347H stainless steel reaches the minimum of 0.661 μm when the grain size of the stainless steel reaches 7 after solution treatment at 1 160 ℃-1 h, and the corrosion resistance of 347H stainless steel in molten nitrate salt reaches the best.

Key words: heat treatment, 347H stainless steel, molten nitrate, corrosion behavior

中图分类号:

TG172

唐梦兰, 王军, 刘天增, 李俊琛, 冯力. 热处理对硝酸熔盐中347H不锈钢腐蚀行为的影响[J]. 兰州理工大学学报, 2021, 47(5): 1-9.

TANG Meng-lan, WANG Jun, LIU Tian-zeng, LI Jun-chen, FENG Li. Effect of heat treatment on the corrosion behavior of 347H stainless steel in molten nitrate salt[J]. Journal of Lanzhou University of Technology, 2021, 47(5): 1-9.

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热处理对硝酸熔盐中347H不锈钢腐蚀行为的影响

Effect of heat treatment on the corrosion behavior of 347H stainless steel in molten nitrate salt

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