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

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	Corrosion Behavior in Molten LiF-NaF-KF Salt of NiCoCrAlY Coating Prepared by Laser Cladding on Hastelloy N
	Zhu, HM ; Chen, MH ; Tang, ZF ; Shen, LZ ; Qiu, CJ
刊名	RARE METAL MATERIALS AND ENGINEERING
	2018
卷号	47 期号:9 页码:2767-2774
关键词	MICROSTRUCTURE CYCLE
ISSN号	1002-185X
文献子类	期刊论文
英文摘要	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 degrees C 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 the Hastelloy N substrate. The substrate is characterized by intergranular corrosion and the element Cr is selectively corroded along the grain boundary. The original Hastelloy N consists of gamma-Ni and M6C, and a new Cr9Mo21Ni20 phase is precipitated after the corrosion test. The NiCoCrAlY coating exhibits homogeneous corrosion, in which the element Al diffuses outwards and the corresponding Al-rich corrosion products act as the barrier and thus protect the substrate by impeding the diffusion of other elements. The laser-cladded coating is composed of gamma-Ni, AlNi3 and Al0.983Cr0.017, and only gamma-Ni remains after the corrosion test. The corrosion resistance of Hastelloy N in molten FLiNaK salt is greatly improved by the laser-cladded NiCoCrAlY coating.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/30890]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 2.Univ South China, Hengyang 421001, Peoples R China
推荐引用方式 GB/T 7714	Zhu, HM,Chen, MH,Tang, ZF,et al. Corrosion Behavior in Molten LiF-NaF-KF Salt of NiCoCrAlY Coating Prepared by Laser Cladding on Hastelloy N[J]. RARE METAL MATERIALS AND ENGINEERING,2018,47(9):2767-2774.
APA	Zhu, HM,Chen, MH,Tang, ZF,Shen, LZ,&Qiu, CJ.(2018).Corrosion Behavior in Molten LiF-NaF-KF Salt of NiCoCrAlY Coating Prepared by Laser Cladding on Hastelloy N.RARE METAL MATERIALS AND ENGINEERING,47(9),2767-2774.
MLA	Zhu, HM,et al."Corrosion Behavior in Molten LiF-NaF-KF Salt of NiCoCrAlY Coating Prepared by Laser Cladding on Hastelloy N".RARE METAL MATERIALS AND ENGINEERING 47.9(2018):2767-2774.