| 引用本文: | 谢天赋,甘章华,邱鹏云,吴传栋,刘意,王佳敏.氰酸钠熔盐中金属材料的高温侵蚀行为研究[J].材料科学与工艺,2024,32(6):19-25.DOI:10.11951/j.issn.1005-0299.20230090. |
| XIE Tianfu,GAN Zhanghua,QIU Pengyun,WU Chuandong,LIU Yi,WANG Jiamin.High temperature erosion behavior and microstructure of metallic materials in molten salt of sodium cyanate[J].Materials Science and Technology,2024,32(6):19-25.DOI:10.11951/j.issn.1005-0299.20230090. |
|
| 摘要: |
| 氰酸钠熔盐高温反应釜通常采用316L不锈钢制备,高温服役环境的侵蚀失效导致其使用寿命不足。为了提高氰酸钠熔盐反应釜的寿命,本文研究了316L、C-2000、C-276、高纯Ni和高纯Cu五种金属材料在氰酸钠熔盐中的耐侵蚀性。采用差量法测试侵蚀速率,利用体视显微镜和扫描电镜观察了5种样品侵蚀前后的宏观和微观形貌,用XRD和EDS分析侵蚀产物的物相和成分。研究表明:侵蚀速率由小到大依次为Ni2O2.4、CrO3相组成；C-2000表面化合物层和扩散层均由CrN相构成；C-276表面化合物层有CrN和NiO相产生,扩散层以NiO相形式存在。分析认为,氰酸钠高温熔盐对金属的主要侵蚀机理是氮化和氧化。采用高纯铜或高纯镍代替316L不锈钢制备氰酸钠熔盐用反应釜有望提高其使用寿命。 |
| 关键词: 氰酸钠 侵蚀速率 侵蚀产物 侵蚀机理 反应釜寿命 |
| DOI：10.11951/j.issn.1005-0299.20230090 |
| 分类号:TG17 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(51904213)；湖北省重大专项项目(2022BEC025). |
|
| High temperature erosion behavior and microstructure of metallic materials in molten salt of sodium cyanate |
|
XIE Tianfu1, GAN Zhanghua1, QIU Pengyun2, WU Chuandong1, LIU Yi1, WANG Jiamin1
|
|
(1.State Key Laboratory of Refractory Materials and Metallurgy (Wuhan University of Science and Technology), Wuhan 430081, China;2.Hunan Lide Technology New Material Co., Ltd., Hunan 410399, China)
|
| Abstract: |
| The high-temperature reaction kettle for sodium cyanide molten salt is usually made of 316L stainless steel, but its lifespan is insufficient due to high-temperature corrosion failure. In order to improve the lifespan of the sodium cyanide molten salt reactor, this article studied the corrosion resistance of five metal materials, namely 316L, C-2000, C-276, high-purity Ni, and high-purity Cu, in sodium cyanide molten salt. The erosion rate was measured using the differential method, and the macroscopic and microscopic morphology before and after erosion were observed using a stereomicroscope and SEM. The phases and compositions of the erosion products were analyzed using XRD and EDS. The research show that the erosion rates, from lowest to highest, are Ni2O2.4, and CrO3 phases. The surface compound layer and diffusion layer of C-2000 are both composed of CrN phase. The surface compound layer of C-276 contains CrN and NiO phases, while the diffusion layer exists in the form of NiO phase. The analysis shows that the main erosion mechanisms of sodium cyanate high-temperature molten salt on metals are nitridation and oxidation. The use of high-purity copper or high-purity nickel instead of 316L stainless steel for the preparation of sodium cyanide molten salt in reaction reactors is expected to improve its lifespan. |
| Key words: sodium cyanate erosion rate erosion products erosion mechanism reactor lifetime |
