Ni/AlN Composite Coating for Corrosion and Elements Interdiffusion Resistance in Molten Fluoride Salts System

2021 ◽  
Author(s):  
Chengxu Wang ◽  
Wei Chen ◽  
Minghui Chen ◽  
Demin Chen ◽  
Fuhui Wang
Keyword(s):  
Composite Coating ◽  
Molten Fluoride ◽  
Fluoride Salts

NICKELVAC N

Alloy Digest ◽  
1990 ◽  
Vol 39 (12) ◽  
Keyword(s):  
Solid Solution ◽  
Corrosion Resistance ◽  
Heat Treating ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Good Oxidation Resistance ◽  
Temperature Performance ◽  
Molten Fluoride ◽  
Fluoride Salts ◽  
Container Material

Abstract NICKEL VAC N was originally developed as a container material for molten fluoride salts. It is a moderate strength, solid solution strengthened alloy with good oxidation resistance to 1800 F. It has excellent resistance to fluoride salts in the range 1300-1600 F. It is produced by vacuum induction melting followed electroslag remelting. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-388. Producer or source: Teledyne Allvac.

Interaction of Pipeline Materials with Molten Fluoride Salts

2007 ◽  
Vol 62 (12) ◽  
pp. 769-774
Author(s):  
Tomáš Šimo ◽  
Oldřich Matal ◽  
Lukáś Nesvadba ◽  
Vladimír Dvořák ◽  
Viktor Kanický ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Power Efficiency ◽  
Nuclear Reactor ◽  
Optical Emission ◽  
Theoretical Models ◽  
Emission Spectrometry ◽  
Experimental Investigations ◽  
Salt Melts ◽  
Molten Fluoride ◽  
Fluoride Salts

Molten fluoride salts are very promising carriers for the transport of large amounts of heat for example from a high temperature nuclear reactor to a plant which generates hydrogen by chemical processes or from a nuclear reactor to a heat exchanger being a part of the equipment needed to realize the Brayton cycle with a very high power efficiency. Therefore, in the framework of our project, experimental and theoretical investigations of the interactions of fluoride salts as heat carriers needed as high potential and structural materials for pipelines in order to transport heat at temperatures above 600◦C were started. Experimental investigations of Fe-based and Ni-based materials in molten fluoride salts at high temperatures and with different exposure times were performed. Two components salts (LiF-NaF and NaF-NaBF4) and three components salts (LiF-NaF-ZrF4 and LiF-NaF-RbF) were chosen in the experiments. The salt analysis was focussed on the content of metallic elements before and after the exposure of the samples to the salt melts. It was done by inductively coupled plasma-optical emission spectrometry (ICP-OES) and by titrimetric techniques. The thickness of the material zone affected by the salt melts, characterized by an enriched / reduced content of elements in comparison to the mean original content, and the material attacked zone, characterized by very tiny channels or chains of pores or pits formed preferably at grain boundaries, were the subject of the analysis performed by electron microscopy / microprobe techniques. Theoretical models for the transport of elements in the material samples exposed to salt melts using experimental data were also developed.

Metallic impurities induced corrosion of a Ni-26W-6Cr alloy in molten fluoride salts at 850 oC

2021 ◽  
Vol 178 ◽  
pp. 109079
Author(s):  
Hua Ai ◽  
Shulin Liu ◽  
Xiang-Xi Ye ◽  
Li Jiang ◽  
Bo Zhou ◽  
...  
Keyword(s):  
Molten Fluoride ◽  
Fluoride Salts ◽  
Metallic Impurities

Electrochemical Behavior of Dy(III) and Dy-Fe Alloys Preparation by Co-Reduction in Molten Fluoride Salts

2017 ◽  
Vol 164 (4) ◽  
pp. D263-D268 ◽  
Author(s):  
Yukang Shi ◽  
Xiaolong Liu ◽  
Yuan Gao ◽  
Chao Huang ◽  
Bing Li
Keyword(s):  
Electrochemical Behavior ◽  
Molten Fluoride ◽  
Fe Alloys ◽  
Co Reduction ◽  
Fluoride Salts

Effects of Thermal Ageing on Microstructure and Hardness of Ni Cladding on Austenitic Stainless Steel by GTAW

2018 ◽  
Author(s):  
Kun Yu ◽  
Xianwu Shi ◽  
Zhijun Li ◽  
Chaowen Li ◽  
Shuangjian Chen ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Austenitic Stainless Steel ◽  
Fuel Cycle ◽  
Thermal Ageing ◽  
High Temperature Strength ◽  
Characterization Methods ◽  
Gas Tungsten Arc ◽  
Molten Fluoride ◽  
Fluoride Salts

As one of the most promising Generation IV nuclear reactors, thorium molten salt reactor (TMSR) possesses inherent safety, simplified fuel cycle and high power generation efficiency. However, the structure material of TMSR must encounter challenges of high-temperature environment and serious molten fluoride salts corrosion. Although the UNS N10003 alloy has excellent performance in TMSR, the high cost of this alloy reduces the economy of TMSR. Although the austenitic stainless steel possesses excellent high temperature strength and lower cost, it exhibits poor corrosion resistance in molten fluoride salts. Therefore, the purpose of this work is using Ni cladding on austenitic stainless steel by gas tungsten arc welding (GTAW) for corrosion protection and investigating the effects of thermal ageing on microstructure and hardness of cladding. The elements distribution and segregation, the precipitates behavior and the microstructure evolution of interface and cladding layer under as-welded and thermal ageing conditions were studied by a series of characterization methods respectively. The hardness evolution of claddings under as-welded and thermal ageing conditions were tested and discussed.

scholarly journals Electrochemical extraction of lanthanum in molten fluoride salts assisted by KF or NaF

2019 ◽  
Vol 104 ◽  
pp. 106468 ◽  
Author(s):  
Yafei Wang ◽  
Jianbang Ge ◽  
Weiqian Zhuo ◽  
Shaoqiang Guo ◽  
Jinsuo Zhang
Keyword(s):  
Molten Fluoride ◽  
Electrochemical Extraction ◽  
Fluoride Salts
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