Electrochemical impedance spectroscopy (EIS): An efficient technique for monitoring corrosion processes in molten salt environments in CSP applications
This study assessed the behaviour of a constructive material in CSP plants, namely ferritic-martensitic steel, with molten NaNO3/KNO3 (60/40wt%), also known as Solar Salt. To this end, EIS is presented as a suitable technique to evaluate and monitor the resistance of this material to Solar Salt at 5...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/112279 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/112279 |
| Access Level: | acceso abierto |
| Palabra clave: | 669.14:620.193 EIS Solar Salt Molten salt Constructive material Corrosion monitoring CSP Materiales 3312 Tecnología de Materiales 2213 Termodinámica 3303 Ingeniería y Tecnología Químicas |
| Sumario: | This study assessed the behaviour of a constructive material in CSP plants, namely ferritic-martensitic steel, with molten NaNO3/KNO3 (60/40wt%), also known as Solar Salt. To this end, EIS is presented as a suitable technique to evaluate and monitor the resistance of this material to Solar Salt at 580°C. Tests were performed up to 1000h and results were also supported by gravimetric and microstructural characterisation of the samples and chemical analysis of the salt. According to the EIS results, a diffusion-controlled reaction occurred during contact, which indicates that the corrosion process follows a porous layer mechanism. The results also indicated variations in corrosion layer thickness and instability of the salt during the whole test. The EIS results were also used for determining the corrosion rate, this being estimated at ~300µmyear−1. Results obtained by EIS were in line with the behaviour of P91 steel as measured by gravimetric, morphological and chemical analysis. Thus, the results confirm the suitability of EIS for monitoring corrosion processes in real-time of constructive materials in CSP plants. |
|---|