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Title: Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies

Abstract

Next-generation solar power conversion systems in concentrating solar power (CSP) applications require high-temperature advanced fluids in the range of 600–800 °C. Current commercial CSP plants use molten nitrate salt mixtures as the heat transfer fluid and the thermal energy storage (TES) media while operating with multiple hours of energy capacity and at temperatures lower than 565 °C. At higher temperatures, the nitrates cannot be used because they decompose. Molten chloride salts are candidates for CSP applications because of their high decomposition temperatures and good thermal properties; but they can be corrosive to common alloys used in vessels, heat exchangers, and piping at these elevated temperatures. In this article, we present the results of the corrosion evaluations of several alloys in eutectic 34.42 wt% NaCl – 65.58 wt% LiCl at 650–700 °C in nitrogen atmosphere. Electrochemical evaluations were performed using open-circuit potential followed by a potentiodynamic polarization sweep. Corrosion rates were determined using Tafel slopes and Faraday's law. A temperature increase of as little as 50 °C more than doubled the corrosion rate of AISI stainless steel 310 and Incoloy 800H compared to the initial 650 °C test. These alloys exhibited localized corrosion. Inconel 625 was the most corrosion-resistant alloy withmore » a corrosion rate of 2.80±0.38 mm/year. For TES applications, corrosion rates with magnitudes of a few millimeters per year are not acceptable because of economic considerations. Additionally, localized corrosion (intergranular or pitting) can be catastrophic. Furthermore, corrosion-mitigation approaches are required for advanced CSP plants to be commercially viable.« less

Authors:
 [1];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1257551
Alternate Identifier(s):
OSTI ID: 1325270
Report Number(s):
NREL/JA-5500-66629
Journal ID: ISSN 0927-0248
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Solar Energy Materials and Solar Cells
Additional Journal Information:
Journal Volume: 157; Journal Issue: C; Journal ID: ISSN 0927-0248
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; concentrating solar power; heat transfer fluid; thermal energy storage; molten salts; corrosion; chlorides

Citation Formats

Gomez-Vidal, Judith C., and Tirawat, Robert. Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies. United States: N. p., 2016. Web. https://doi.org/10.1016/j.solmat.2016.05.052.
Gomez-Vidal, Judith C., & Tirawat, Robert. Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies. United States. https://doi.org/10.1016/j.solmat.2016.05.052
Gomez-Vidal, Judith C., and Tirawat, Robert. Wed . "Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies". United States. https://doi.org/10.1016/j.solmat.2016.05.052. https://www.osti.gov/servlets/purl/1257551.
@article{osti_1257551,
title = {Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies},
author = {Gomez-Vidal, Judith C. and Tirawat, Robert},
abstractNote = {Next-generation solar power conversion systems in concentrating solar power (CSP) applications require high-temperature advanced fluids in the range of 600–800 °C. Current commercial CSP plants use molten nitrate salt mixtures as the heat transfer fluid and the thermal energy storage (TES) media while operating with multiple hours of energy capacity and at temperatures lower than 565 °C. At higher temperatures, the nitrates cannot be used because they decompose. Molten chloride salts are candidates for CSP applications because of their high decomposition temperatures and good thermal properties; but they can be corrosive to common alloys used in vessels, heat exchangers, and piping at these elevated temperatures. In this article, we present the results of the corrosion evaluations of several alloys in eutectic 34.42 wt% NaCl – 65.58 wt% LiCl at 650–700 °C in nitrogen atmosphere. Electrochemical evaluations were performed using open-circuit potential followed by a potentiodynamic polarization sweep. Corrosion rates were determined using Tafel slopes and Faraday's law. A temperature increase of as little as 50 °C more than doubled the corrosion rate of AISI stainless steel 310 and Incoloy 800H compared to the initial 650 °C test. These alloys exhibited localized corrosion. Inconel 625 was the most corrosion-resistant alloy with a corrosion rate of 2.80±0.38 mm/year. For TES applications, corrosion rates with magnitudes of a few millimeters per year are not acceptable because of economic considerations. Additionally, localized corrosion (intergranular or pitting) can be catastrophic. Furthermore, corrosion-mitigation approaches are required for advanced CSP plants to be commercially viable.},
doi = {10.1016/j.solmat.2016.05.052},
journal = {Solar Energy Materials and Solar Cells},
number = C,
volume = 157,
place = {United States},
year = {2016},
month = {6}
}

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Cited by: 6 works
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Works referenced in this record:

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