Corrosion Behavior of 304, 316 Stainless Steels and Inconel 617 Ni-based Alloy in Molten Nitrate Salt
摘 要
将304、316不锈钢和Inconel 617镍基合金在565℃硝酸熔盐(60%NaNO3+40%KNO3,质量分数)中进行长时静态腐蚀试验,对比研究了3种材料的腐蚀动力学曲线以及表面腐蚀形貌、物相组成和微区成分。结果表明:3种材料均发生了氧化腐蚀,其中304和316不锈钢具有抛物线型的腐蚀动力学特征,而Inconel 617镍基合金在短暂质量增加之后出现了明显的腐蚀质量损失现象;Inconel 617镍基合金的耐腐蚀性能最好,304不锈钢的最差;在腐蚀初期,304、316不锈钢表面均形成了针状和片状腐蚀产物,随着腐蚀时间的延长,腐蚀产物转变为尖晶石结构, Inconel 617镍基合金表面的腐蚀产物呈颗粒状,随着腐蚀时间的延长,部分颗粒变大;304和316不锈钢表面均形成了以Fe2O3和(Fe,Cr)3O4为主的腐蚀产物层,Inconel 617镍基合金表面则形成了以NiO和CoO为主的腐蚀产物层。
Abstract
Long-time immersion corrosion experiments were conducted on 304, 316 stainless steels and Inconel 617 Ni-based alloy in molten nitrate salt (60wt%NaNO3+40wt%KNO3) at 565℃. The corrosion kinetic curves and corrosion morphology, phase composition and microcomposition on surface of the three materials were studied and compared. The results show that oxidation corrosion occurred on the three materials. In addition, 304 and 316 stainless steels had parabolic corrosion kinetic characteristcs, while Inconel 617 Ni-based alloy exhibited significant corrosion mass loss after a brief mass increase. The corrosion resistance of Inconel 617 alloy was the best and that of 304 stainless steel was the worst. In the initial stage of corrosion, acicular and flaky corrosion products were formed on surfaces of 304 and 316 stainless steels; with increasing corrosion time, the corrosion products changed into spinel structure. The corrosion products on surface of Inconel 617 Ni-based alloy were granular, and some particles became larger with increasing corrosion time. The corrosion product layers on surfaces of 304 and 316 stainless steels were mainly composed of Fe2O3 and (Fe,Cr)3O4, while that on surface of Inconel 617 Ni-based alloy was mainly composed of NiO and CoO.
中图分类号 TG172.2 DOI 10.11973/jxgccl201905005
所属栏目 试验研究
基金项目
收稿日期 2018/4/3
修改稿日期 2019/3/25
网络出版日期
作者单位点击查看
备注张学文(1992-),男,山西大同人,硕士研究生
引用该论文: ZHANG Xuewen,LI Hongchuan,LI Shengyun,XUE Weiwei,LIU Kun,TANG Jianqun,GONG Jianming. Corrosion Behavior of 304, 316 Stainless Steels and Inconel 617 Ni-based Alloy in Molten Nitrate Salt[J]. Materials for mechancial engineering, 2019, 43(5): 24~29
张学文,李洪川,李生云,薛伟伟,刘坤,唐建群,巩建鸣. 304、316不锈钢和Inconel 617镍基合金在硝酸熔盐中的腐蚀行为[J]. 机械工程材料, 2019, 43(5): 24~29
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参考文献
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【5】章国芳, 朱天宇, 王希晨. 塔式太阳能热发电技术进展及在我国的应用前景[J]. 太阳能, 2008(11):33-37.
【6】张宏韬, 赵有璟, 张萍,等. 硝酸熔盐储热材料在太阳能利用中的研究进展[J]. 材料导报, 2015, 29(1):54-60.
【7】GOODS S H, BRADSHAW R W. Corrosion of stainless steels and carbon steel by molten mixtures of commercial nitrate salts[J]. Journal of Materials Engineering and Performance, 2004, 13(1):78-87.
【8】DORCHEH A S, DURHAM R N, GALETZ M C. Corrosion behavior of stainless and low-chromium steels and IN625 in molten nitrate salts at 600℃[J]. Solar Energy Materials and Solar Cells, 2016, 144:109-116.
【9】MCCONOHY G, KRUIZENGA A. Molten nitrate salts at 600 and 680℃:Thermophysical property changes and corrosion of high-temperature nickel alloys[J]. Solar Energy, 2014, 103:242-252.
【10】DUNN R I, HEARPS P J, WRIGHT M N. Molten-salt power towers:Newly commercial concentrating solar storage[J]. Proceedings of the IEEE, 2012, 100(2):504-515.
【11】BRADSHAW R W, DAWSON D B, DE LA ROSA W, et al. Final test and evaluation results from the solar two project[R].[S.l.]:[s.n.], 2002. DOI:10.2172/793226.
【12】BURSTEIN G T, PISTORIUS P C, MATTIN S P. The nucleation and growth of corrosion pits on stainless steel[J]. Corrosion Science, 1993, 35(1/2/3/4):57-62.
【13】陈华. 奥氏体不锈钢高温氧化性能与晶粒长大行为的研究[D]. 兰州:兰州理工大学, 2011.
【14】BARAKA A, ABDEL-ROHMAN A I, EL HOSARY A A. Corrosion of mild steel in molten sodium nitrate-potassium nitrate eutectic[J]. British Corrosion Journal, 1976, 11(1):44-46.
【15】SINGH I B. The influence of moisture on the oxidation rate of iron in NaNO3 and KNO3 melts[J]. Corrosion Science, 1995, 37(12):1981-1989.
【16】HARA M, KANNO H, SHINATA Y. The corrosion of nickel under cathodic polarization in molten NaNO3[J]. Corrosion Science, 1992, 33(10):1569-1580.
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