宋安奇, 朱思淼, 张秀菊, 李恒, 王小威, 巩建鸣. 激光熔覆Inconel625、316L涂层在含氯硝酸熔盐中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 10.11902/1005.4537.2026.246.
Anqi SONG, Simiao ZHU, Xiuju ZHANG, Heng LI, Xiaowei WANG, Jianming GONG. Corrosion Behavior of Laser-Clad Inconel 625 and 316L Coatings in Chloride-Containing Nitrate Molten Salt[J]. Journal of Chinese Society for Corrosion and protection, 0, (): 0-.

摘要 相关文章 Metrics 全文: PDF(2031 KB)   摘要: 熔盐储热系统中阀门等关键构件长期服役于含氯杂质的硝酸盐体系，其高温腐蚀问题已成为制约系统运行安全性与服役寿命的瓶颈，而激光熔覆技术为提升金属基材的耐蚀性能提供了有效途径。本文以P91耐热钢为基体，采用激光熔覆技术分别制备了316L不锈钢与Inconel 625合金涂层，系统研究了两种涂层在565℃ NaNO₃-KNO₃-NaCl熔盐体系中的高温腐蚀行为。结果表明：P91基体经500 h腐蚀后质量变化高达231.88 mg/cm²，而316L与Inconel 625涂层的增重均低于15 mg/cm²，激光熔覆涂层表现出优异的耐熔盐腐蚀性能。相较于锻态试样，激光熔覆涂层腐蚀层厚度分布不均，且呈现出腐蚀产物沿晶界向内蔓生的特殊形貌特征。进一步的微观表征显示，激光熔覆快速凝固过程导致Inconel 625涂层晶粒显著粗化，在一定程度上优化了整体耐蚀性，但涂层内部出现的Mo、Nb元素偏析促进了择优氧化，诱发了局部非均匀腐蚀。本研究揭示了激光熔覆涂层在含氯硝酸熔盐中的腐蚀演化机制，为高性能耐蚀涂层的设计与工程应用提供了理论依据。 关键词 ： 激光熔覆,  熔盐腐蚀,  Inconel625涂层,  316L涂层,  元素偏析     Abstract：Key components such as valves in molten salt thermal energy storage systems are subjected to long-term service in nitrate salt systems containing chloride impurities, and the associated high-temperature corrosion has become a bottleneck restricting the operational safety and service life. Laser cladding technology offers an effective approach to enhance the corrosion resistance of metallic substrates. In this study, P91 heat-resistant steel was used as the substrate, and 316L stainless steel and Inconel 625 alloy coatings were respectively prepared by laser cladding. The high-temperature corrosion behavior of the two coatings in a NaNO₃-KNO₃-NaCl molten salt system at 565°C was systematically investigated. The results show that the mass change of the P91 substrate after 500 h of corrosion reached as high as 231.88 mg/cm², while the weight gains of both the 316L and Inconel 625 coatings were below 15 mg/cm², demonstrating excellent corrosion resistance to the molten salt. Compared with wrought specimens, the laser-clad coatings exhibited uneven corrosion layer thickness and a unique morphological feature of corrosion products growing inward along grain boundaries. Further microscopic characterization revealed that the rapid solidification during laser cladding led to significant grain coarsening in the Inconel 625 coating, which to some extent optimized the overall corrosion resistance; however, the segregation of Mo and Nb elements within the coating promoted preferential oxidation and induced localized non-uniform corrosion. This study elucidates the corrosion evolution mechanism of laser-clad coatings in chloride-containing nitrate molten salt, providing a theoretical basis for the design and engineering application of high-performance corrosion-resistant coatings. Key words： Laser cladding    molten-salt corrosion    Inconel 625 coating    316L coating    element segregation 收稿日期: 2026-07-29      基金资助:垃圾焚烧烟气冷凝耦合灰沉积的低温腐蚀机理与涂层防护研究(52206143); 熔盐-蠕变-疲劳损伤致裂机制与寿命预测方法研究(52375149) 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 宋安奇 朱思淼 张秀菊 李恒 王小威 巩建鸣 44.8K 链接本文: https://www.jcscp.org/CN/10.11902/1005.4537.2026.246      或      https://www.jcscp.org/CN/Y0/V/I/0 [1] 周吉, 帅若辉, 杨继凯, 娄丽艳, 刘伊, 鲁俊豪, 蔡志海, 王海斗, 李成新. 21CrMoV钢表面激光熔覆Stellite合金涂层的组织及高温氧化性能[J]. 中国腐蚀与防护学报, 2026, 46(4): 1269-1278. [2] 卢华轶, 李若愚, 程宇飞, 白英雄, 王艳丽. NiCrMoNb和NiCoFeCrMoNb合金在700 ℃熔融NaCl-KCl-MgCl2 中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2026, 46(3): 730-742. [3] 纪云瀚, 王勤英, 郑杰, 李怡璇, 西宇辰, 董立谨, 张杨飞, 白树林. 无磁钻铤不锈钢激光熔覆层的微观组织与腐蚀磨损特性[J]. 中国腐蚀与防护学报, 2026, 46(1): 175-185. [4] 刘海龙, 王力, 赵卫国, 韩嘉彧, 王轻松, 龙佳怡, 贺星, 高黎黎, 王华, 胡平. 钼合金表面Si-ZrB2-Ti-Cr多元涂层的激光熔覆制备及高温抗氧化性能[J]. 中国腐蚀与防护学报, 2026, 46(1): 155-164. [5] 丁昊, 杜凌霄, 舒琴, 曹甫洋, 谢云, 彭晓. WC含量对激光熔覆AlCoCrFeNi2.1 共晶高熵合金涂层磨损和腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2026, 46(1): 126-136. [6] 胡红钰, 王跃飞, 严海心, 史建军, 吴多利. 激光熔覆液压支架立柱防腐耐磨涂层研究进展[J]. 中国腐蚀与防护学报, 2026, 46(1): 25-36. [7] 孙方红, 任延杰, 宋文卿. 42CrMo钢表面激光熔覆涂层的研究现状及进展[J]. 中国腐蚀与防护学报, 2025, 45(4): 849-858. [8] 王昆, 邹兰欣, 郭磊, 闫凯, 叶福兴, 刘洪丽, 郭洪波. 航空发动机及燃气轮机热障涂层高温腐蚀与防护[J]. 中国腐蚀与防护学报, 2025, 45(1): 1-19. [9] 杨海云, 刘春泉, 熊芬, 陈敏纳, 谢岳林, 彭龙生, 孙胜, 刘海洲. 超高速激光熔覆制备耐腐蚀涂层研究进展[J]. 中国腐蚀与防护学报, 2024, 44(4): 847-862. [10] 邓双九, 李昌, 余梦辉, 韩兴. IN625激光熔覆层腐蚀致微裂纹扩展机理研究[J]. 中国腐蚀与防护学报, 2024, 44(3): 645-657. [11] 吴多利, 吴昊天, 孙珲, 史建军, 魏新龙, 张超. 激光熔覆高温防护涂层研究现状及发展方向[J]. 中国腐蚀与防护学报, 2023, 43(4): 725-736. [12] 裴书博, 万冬阳, 周萍, 曹国钦, 胡俊华. 高熵涂层的制备工艺、组织结构和抗氧化腐蚀研究进展[J]. 中国腐蚀与防护学报, 2022, 42(5): 873-878. [13] 王勤英,裴芮,西宇辰. 镍基激光熔覆层冲刷腐蚀行为研究[J]. 中国腐蚀与防护学报, 2019, 39(5): 458-462. [14] 王昆林;张庆波;魏兴国;朱允明. La_2O_3对镍基合金激光熔覆层耐蚀性的影响[J]. 中国腐蚀与防护学报, 1998, 18(3): 237-240. Viewed Full text Abstract Cited   Shared      Discussed