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Materials Corrosion in Molten Salts and Heat Storage

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Corrosion".

Deadline for manuscript submissions: 20 May 2024 | Viewed by 1285

Special Issue Editor


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Guest Editor
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Interests: molten salt; heat transfer and storage; corrosion

Special Issue Information

Dear Colleagues,

Molten salts have been regarded as one of the most promising candidate heat transfer fluids (HTF) and thermal energy storage (TES) materials in the fields of electrometallurgy, thermal energy storage, concentrating solar power, nuclear energy, etc., due to the relatively low cost, superior thermophysical properties and abundant reserves in nature. From the thermodynamic viewpoint, pure molten salt is very stable and not corrosive. Actually, the corrosion property of molten salt cannot be ignored and has received increased attention worldwide because of the inevitable impurities of molten salt during the process of preparation and operation. In sever cases, the pipelines in contact with the molten salt can have holes corroded into them, leading to the high-temperature molten salt gushing out, then the whole system is down due to this serious accident. Thus, the compatibility of structural materials and molten salt is quite important and critical for choosing appropriate materials and molten salt in practice. Many influence factors such as temperature, redox, corrosion product, flow velocity, stress, and friction can cause the corrosion of the structural materials in molten salt. With the increasing commercial application in practice, the corrosion issues of molten salt receive increasing attention to solve the corrosion problems.

Prof. Dr. Zhongfeng Tang
Guest Editor

Manuscript Submission Information

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Keywords

  • molten salt
  • high-temperature
  • corrosion
  • alloys
  • heat transfer and storage

Published Papers (1 paper)

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Research

20 pages, 9740 KiB  
Article
High-Temperature Corrosion Behavior of Selected HVOF-Sprayed Super-Alloy Based Coatings in Aggressive Environment at 800 °C
by Zdeněk Česánek, Kateřina Lencová, Jan Schubert, Jakub Antoš, Radek Mušálek, František Lukáč, Marek Palán, Marek Vostřák and Šárka Houdková
Materials 2023, 16(12), 4492; https://doi.org/10.3390/ma16124492 - 20 Jun 2023
Cited by 3 | Viewed by 1024
Abstract
This study is focused on the high-temperature corrosion evaluation of selected thermally sprayed coatings. NiCoCrAlYHfSi, NiCoCrAlY, NiCoCrAlTaReY, and CoCrAlYTaCSi coatings were sprayed on the base material 1.4923. This material is used as a cost-efficient construction material for components of power equipment. All evaluated [...] Read more.
This study is focused on the high-temperature corrosion evaluation of selected thermally sprayed coatings. NiCoCrAlYHfSi, NiCoCrAlY, NiCoCrAlTaReY, and CoCrAlYTaCSi coatings were sprayed on the base material 1.4923. This material is used as a cost-efficient construction material for components of power equipment. All evaluated coatings were sprayed using HP/HVOF (High-Pressure/High-Velocity Oxygen Fuel) technology. High-temperature corrosion testing was performed in a molten salt environment typical for coal-fired boilers. All coatings were exposed to the environment of 75% Na2SO4 and 25% NaCl at the temperature of 800 °C under cyclic conditions. Each cycle consisted of 1 h heating in a silicon carbide tube furnace followed by 20 min of cooling. The weight change measurement was performed after each cycle to establish the corrosion kinetics. Optical microscopy (OM), scanning electron microscopy (SEM), and elemental analysis (EDS) were used to analyze the corrosion mechanism. The CoCrAlYTaCSi coating showed the best corrosion resistance of all the evaluated coatings, followed by NiCoCrAlTaReY and NiCoCrAlY. All the evaluated coatings performed better in this environment than the reference P91 and H800 steels. Full article
(This article belongs to the Special Issue Materials Corrosion in Molten Salts and Heat Storage)
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