期刊论文

Corrosion Behavior in Molten LiF-NaF-KF Salt of NiCoCrAlY Coating Prepared by Laser Cladding on Hastelloy N

Zhu Hongmei

中文

稀有金属材料与工程

1002-185X

2018

47

9

2767-2774

国家自然科学基金（91326114） 湖南省教育厅省重点实验室开放基金（15K108） 南华大学青年英才支持计划（2014-002） 湖南省重点学科建设项目（湘教发[2011]76号）

本校为第一且通讯机构

采用激光熔覆同步送粉技术在Hastelloy N合金表面制备了NiCoCrAlY涂层,研究了Hastelloy N基材和含NiCoCrAlY涂层的Hastelloy N试样在900 ℃ LiF-NaF-KF熔盐中的腐蚀行为。利用失重腐蚀法评估了试样的耐熔盐腐蚀能力,采用XRD和SEM表征了基材和涂层的物相组成、显微组织和腐蚀形貌,并结合EDS分析了微区成分。结果表明, NiCoCrAlY涂层试样的腐蚀速率仅为Hastelloy N基材的2/3。Hastelloy N基材表现为晶间腐蚀,其中Cr元素沿晶界发生选择性脱溶腐蚀,腐蚀前由γ-Ni和M_6C(M为Ni、Co、Cr等)等物相组成,腐蚀后新析出Co_9Mo_(21)Ni_(20)相。NiCoCrAlY涂层表现为均匀腐蚀,其中Al元素充当“消耗品”由涂层均...

A NiCoCrAlY coating has been prepared on Hastelloy N substrate by the powder-feeding laser cladding technique. The corrosion behaviors in molten LiF-NaF-KF (FLiNaK) salt at 900℃ for 100 h were studied for both the substrate and the coating. The corrosion resistance in molten FLiNaK salt was evaluated by the corrosion mass loss method, while the microanalysis on phase constitution, morphologies and composition were carried out by XRD, SEM and EDS. The results show that the corrosion rate of the NiCoCrAlY coating is merely two thirds of that of ...