Corrosion behavior of Fe based container alloys in molten Na2CO3-K2CO3 as thermal energy storage medium for reversible solid oxide cells

Junwei Wang; Hua Liu; Yuliang Liu; Ming Chen

doi:10.1016/j.corsci.2023.111616

Corrosion behavior of Fe based container alloys in molten Na₂CO₃-K₂CO₃ as thermal energy storage medium for reversible solid oxide cells

Junwei Wang, Hua Liu, Yuliang Liu, Ming Chen^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

In this work corrosion behavior of SUS 441, Crofer 22 APU and Canthal APM in molten Na₂CO₃-K₂CO₃ at 800 °C is studied. The 441 and APU corrode heavily as the element Cr in the steel is oxidized to NaCrO₂. Cr diffuses along grain boundary preferentially and the molten salt penetrates through the corrosion layer. Several porous corrosion layers rich in Cr, O, Na or rich in Fe are formed alternatively on the APU surface. On the contrary, the APM alloy shows excellent corrosion resistance (0.02 mm/y) due to formation of a protective Al₂O₃ layer.

Original language	English
Article number	111616
Journal	Corrosion Science
Volume	225
Number of pages	18
ISSN	0010-938X
DOIs	https://doi.org/10.1016/j.corsci.2023.111616
Publication status	Published - 2023

Keywords

Molten salt
Steel
High temperature corrosion
Selective oxidation
Intergranular corrosion

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@article{5d1d47f4493e4dcebfb5a040b431f193,

title = "Corrosion behavior of Fe based container alloys in molten Na2CO3-K2CO3 as thermal energy storage medium for reversible solid oxide cells",

abstract = "In this work corrosion behavior of SUS 441, Crofer 22 APU and Canthal APM in molten Na2CO3-K2CO3 at 800 °C is studied. The 441 and APU corrode heavily as the element Cr in the steel is oxidized to NaCrO2. Cr diffuses along grain boundary preferentially and the molten salt penetrates through the corrosion layer. Several porous corrosion layers rich in Cr, O, Na or rich in Fe are formed alternatively on the APU surface. On the contrary, the APM alloy shows excellent corrosion resistance (0.02 mm/y) due to formation of a protective Al2O3 layer.",

keywords = "Molten salt, Steel, High temperature corrosion, Selective oxidation, Intergranular corrosion",

author = "Junwei Wang and Hua Liu and Yuliang Liu and Ming Chen",

year = "2023",

doi = "10.1016/j.corsci.2023.111616",

language = "English",

volume = "225",

journal = "Corrosion Science",

issn = "0010-938X",

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TY - JOUR

T1 - Corrosion behavior of Fe based container alloys in molten Na2CO3-K2CO3 as thermal energy storage medium for reversible solid oxide cells

AU - Wang, Junwei

AU - Liu, Hua

AU - Liu, Yuliang

AU - Chen, Ming

PY - 2023

Y1 - 2023

N2 - In this work corrosion behavior of SUS 441, Crofer 22 APU and Canthal APM in molten Na2CO3-K2CO3 at 800 °C is studied. The 441 and APU corrode heavily as the element Cr in the steel is oxidized to NaCrO2. Cr diffuses along grain boundary preferentially and the molten salt penetrates through the corrosion layer. Several porous corrosion layers rich in Cr, O, Na or rich in Fe are formed alternatively on the APU surface. On the contrary, the APM alloy shows excellent corrosion resistance (0.02 mm/y) due to formation of a protective Al2O3 layer.

AB - In this work corrosion behavior of SUS 441, Crofer 22 APU and Canthal APM in molten Na2CO3-K2CO3 at 800 °C is studied. The 441 and APU corrode heavily as the element Cr in the steel is oxidized to NaCrO2. Cr diffuses along grain boundary preferentially and the molten salt penetrates through the corrosion layer. Several porous corrosion layers rich in Cr, O, Na or rich in Fe are formed alternatively on the APU surface. On the contrary, the APM alloy shows excellent corrosion resistance (0.02 mm/y) due to formation of a protective Al2O3 layer.

KW - Molten salt

KW - Steel

KW - High temperature corrosion

KW - Selective oxidation

KW - Intergranular corrosion

U2 - 10.1016/j.corsci.2023.111616

DO - 10.1016/j.corsci.2023.111616

M3 - Journal article

SN - 0010-938X

VL - 225

JO - Corrosion Science

JF - Corrosion Science

M1 - 111616

ER -