Corrosion of steel alloys in eutectic NaCl + Na2CO3 at 700 C-omicron and Li2CO3 + K2CO3 + Na2CO3 at 450 C-omicron for thermal energy storage

Madjid Sarvghad; Theodore A. Steinberg; Geoffrey Will

doi:10.1016/j.solmat.2017.05.063

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Corrosion of steel alloys in eutectic NaCl + Na2CO3 at 700 C-omicron and Li2CO3 + K2CO3 + Na2CO3 at 450 C-omicron for thermal energy storage

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Corrosion of steel alloys in eutectic NaCl + Na2CO3 at 700 C-omicron and Li2CO3 + K2CO3 + Na2CO3 at 450 C-omicron for thermal energy storage

Madjid Sarvghad, Theodore A. Steinberg and Geoffrey Will

Solar Energy Materials and Solar Cells, Vol.170, pp.48-59

2017

DOI: https://doi.org/10.1016/j.solmat.2017.05.063

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Abstract

steel

molten salt

corrosion

impedance spectroscopy

polarization

microscopy

Stainless steel 316, duplex steel 2205 and carbon steel 1008 were examined for compatibility with the eutectic mixtures of NaCl+Na2CO3 at 700 C-omicron and Li2CO3 + K2CO3 + Na2CO3 at 450 C-omicron in air for thermal energy storage. Electrochemical measurements combined with advanced microscopy and microanalysis techniques were employed. Oxidation was found as the primary attack in both molten salt environments. However, the availability of O-2 controlled the degree of oxidation. Alloy 316 showed the lowest corrosion current densities in each molten salt owing to the formation of films on the surface. The attack morphology on the surface of all materials was uniform corrosion with no localized degradation at 450 C-omicron. Microscopy observations showed grain boundary oxidative attack as the primary corrosion mechanism for all studied alloys at 700 C-omicron with depletion of alloying elements from grain boundaries in alloys 316 and 2205. The protective nature of austenite phase reduced selective oxidation of the underlying ferrite layers of alloy 2205 in chloride carbonate at 700 C-omicron.

Details

Title: Corrosion of steel alloys in eutectic NaCl + Na2CO3 at 700 C-omicron and Li2CO3 + K2CO3 + Na2CO3 at 450 C-omicron for thermal energy storage
Authors: Madjid Sarvghad (Corresponding Author) - Queensland University of Technology
Theodore A. Steinberg (Author) - Queensland University of Technology
Geoffrey Will (Author) - Queensland University of Technology
Publication details: Solar Energy Materials and Solar Cells, Vol.170, pp.48-59
Publisher: Elsevier BV, North-Holland
Date published: 2017
DOI: 10.1016/j.solmat.2017.05.063
ISSN: 1879-3398; 0927-0248
Grant note: Australian Solar Thermal Research Initiative (ASTRI) Australian Government via the Australian Renewable Energy Agency (ARENA) Science and Engineering Faculty, QUT AINSE Ltd
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 99737994202621
Output Type: Journal article

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