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Research Project

New materials approaches for concentrating solar power (CSP): Molten salts and Corrosion Protection.

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Authors

Publications

NEWS4CSP Project: New coatings approaches to protect metallic materials from heat transfer fluids [Poster]
Publication . Cunha Diamantino, Teresa; Pedrosa, Fátima; Paiva Luís, Teresa; Ferreira da Silva, Eduardo; Gonçalves, Francisco; Monteiro, Renato; Cardoso, João
Comparison of the corrosion of ferritic and austenitic stainless steel (AISI 430 and AISI 316L) with LiNaK carbonate salts for thermal energy storage in CSP/CST applications
Publication . Gil, Mafalda; Pedrosa, Fátima; Paiva Luís, Teresa; Figueira Vasques, Isabel; Oliveira, Fernando; Cunha Diamantino, Teresa
ABSTRACT: This study focuses on the corrosion rates and mechanisms of two stainless steels, austenitic AISI 316L and ferritic AISI 430, in contact with a eutectic mixture of LiNaK carbonates in long-term tests at 650 degrees C. The selection of these two stainless steels was based on their differences, both in their intrinsic characteristics and in the cost associated with each one. The research also underscores the importance of optimizing the descaling methods used to evaluate the corrosion rate. Corrosion rates were measured gravimetrically according to ISO 17245:2015, revealing an asymptotic behavior for both steels, with AISI 430 with a corrosion rate of 237 f 21 mu m and AISI 316L of 151 f 13 mu m after 2000 h of testing. Corrosion mechanisms were analyzed using SEM/EDS, GDOES, and XRD techniques, which identified well-defined oxide layers with varying compositions. Given the observed corrosion mechanisms and its lower cost, AISI 430 steel seems to have great applicability in CSP/CST plants, provided it is paired with an appropriate protective coating.

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Description

Keywords

Armazenamento de energia térmica,Sais fundidos,Corrosão,Revestimentos, Engineering and technology

Contributors

Funders

Funding agency

Fundação para a Ciência e a Tecnologia, I.P.
Fundação para a Ciência e a Tecnologia, I.P.

Funding programme

3599-PPCDT
Concurso de Projetos de I&D em Todos os Domínios Científicos - 2022

Funding Award Number

2022.05021.PTDC

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