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Improving the corrosion resistance of ferritic-martensitic steels at 600 °C in molten solar salt via diffusion coatings

Meißner, Tobias and Oskay, Ceyhun and Bonk, Alexander and Gregoire, Benjamin and Donchev, Alexander and Solimani, Ali and Galetz, Mathias C. (2021) Improving the corrosion resistance of ferritic-martensitic steels at 600 °C in molten solar salt via diffusion coatings. Solar Energy Materials and Solar Cells, 227. Elsevier. doi: 10.1016/j.solmat.2021.111105. ISSN 0927-0248.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0927024821001471?via%3Dihub

Abstract

Molten salt corrosion in the receiver’s piping system and storage tanks is still one of the major drawbacks of concentrated solar power (CSP) plants and is currently covered by using expensive high-alloyed steels or Ni-base alloys. The employment of cheaper structural materials combined with protective coatings is an attractive alternative to increase cost-efficiency. The present study investigates the corrosion resistance of three different coatings (a pure Ni, a Cr and a combined Ni+Cr coating) deposited on ferritic-martensitic X20CrMoV12-1 steel during isothermal immersion in molten solar salt in comparison to uncoated Ni-base alloy Haynes 230. Exposure tests were conducted at 600°C for up to 1000 h. To identify the individual role of the main elements, exposure tests of pure Fe, Ni and Cr were undertaken as well. In addition to the crosssectional investigations via light-optical microscopy and EPMA, X-ray diffraction measurements were conducted to identify the corrosion products. These were complemented by weight change measurements and chemical analysis of the salts after the exposure tests. The study reveals differences between the corrosion behaviour of the different coating approaches, which is discussed as a function of coating composition and degradation mechanisms. Whereas pure Cr or pure Ni coatings offer hardly any improved protection of the uncoated X20CrMoV12-1 substrate, the combined Ni+Cr coating performs very well and improves the scaling behaviour of X20CrMoV12-1 significantly. The outcome highlights the correlation between the solubility of the pure metals Fe, Ni and Cr in molten solar salt and the corrosion resistance of the investigated coatings

Item URL in elib:https://elib.dlr.de/142398/
Document Type:Article
Title:Improving the corrosion resistance of ferritic-martensitic steels at 600 °C in molten solar salt via diffusion coatings
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Meißner, TobiasDechema ForschungsinstitutUNSPECIFIED
Oskay, CeyhunDechema ForschungsinstitutUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Gregoire, BenjaminDechema ForschungsinstitutUNSPECIFIED
Donchev, AlexanderDechema ForschungsinstitutUNSPECIFIED
Solimani, AliDechema ForschungsinstitutUNSPECIFIED
Galetz, Mathias C.Dechema FoschungsinstitutUNSPECIFIED
Date:2021
Journal or Publication Title:Solar Energy Materials and Solar Cells
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:227
DOI :10.1016/j.solmat.2021.111105
Publisher:Elsevier
ISSN:0927-0248
Status:Published
Keywords:Concentrated solar power (CSP), Salt chemistry, Molten nitrate corrosion, Ferritic-martensitic steel, Diffusion coatings, Nickel electroplating
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Storage
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bonk, Alexander
Deposited On:20 Jul 2021 14:20
Last Modified:20 Jul 2021 14:20

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