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朱红梅,陈明慧,唐忠锋,申龙章,邱长军.Hastelloy N合金表面激光熔覆NiCoCrAlY涂层在LiF-NaF-KF熔盐中的腐蚀行为研究[J].稀有金属材料与工程(英文),2018,47(9):2767~2774.[Zhu Hongmei,Chen Minghui,Tang Zhongfeng,Shen Longzhang and Changjun Qiu.Corrosion Behavior in Molten Salt of NiCoCrAlY Coating Prepared by Laser Cladding on Hastelloy N[J].Rare Metal Materials and Engineering,2018,47(9):2767~2774.]
Corrosion Behavior in Molten Salt of NiCoCrAlY Coating Prepared by Laser Cladding on Hastelloy N
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Received:November 14, 2016  Revised:May 06, 2017
DOI:
Key words: Hastelloy N  laser cladding  NiCoCrAlY coating  corrosion resistance in molten FLiNaK salt
Foundation item: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)
Author NameAffiliation
Zhu Hongmei,Chen Minghui,Tang Zhongfeng,Shen Longzhang and Changjun Qiu  
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Abstract:
      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 salt at 900oC for 100h are studied for both the substrate and the coating. The corrosion resistance in molten FLiNaK salt is evaluated by the corrosion weight loss method, while the microanalysis on phase constitution, morphologies and compositions are carried out by XRD, SEM and EDS. The results show that, the corrosion rate of the NiCoCrAlY coating is merely two thirds that of the Hastelloy N substrate. The substrate is characterized by intergranular corrosion and the element Cr was selectively corroded along the grain boundary. The origin Hastelloy N is consisted of γ-Ni and Mo, and a new Cr1.12Ni2.88 phase is precipitated after the corrosion test. The NiCoCrAlY coating exhibits a homogeneous corrosion feature, 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 consisted of γ-Ni, AlNi3 and Al0.983Cr0.017, and only γ-Ni retains after the corrosion test. The corrosion resistance of Hastelloy N in molten FLiNaK salt is greatly improved by the laser-cladded NiCoCrAlY coating.