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Title: Corrosion behavior of AISI 316L stainless steel and ODS FeAl aluminide in eutectic Li{sub 2}CO{sub 3}-K{sub 2}CO{sub 3} molten carbonates under flowing CO{sub 2}-O{sub 2} gas mixtures[Oxide Dispersion Strengthened]

Abstract

A kinetics study on AISI 316L stainless steel and ODS (Oxide-Dispersion-Strengthened) FeAl iron aluminide was conducted concerning its corrosion behavior in molten Li{sub 2}CO{sub 3}-K{sub 2}CO{sub 3} eutectic at 650 C in flowing CO{sub 2}-O{sub 2} gas mixtures. The corrosion resistance of FeAl ODS was demonstrated to be significantly superior to that of austenitic AISI 316L steel under all gas conditions tested in this work. At low CO{sub 2} partial pressure (P{sub CO{sub 2}} = 0.3 atm) the corrosion rate of both alloys decreased with time due to the formation of a protective oxide layer. In dry CO{sub 2} gas, corrosion of AISI steel proceeded at a near-linear rate, indicative of a surface-controlled reaction. FeAl corroded initially following parabolic behavior, but, on further reaction, exhibited some weight loss. A similar behavior was also observed in a 67CO{sub 2}-33O{sub 2} gas mixture. Corrosion of FeAl in high CO{sub 2} gas has been postulated to initiate by acidic fluxing of yttria particles. The attack then develops as pitting and leads to further reaction by general corrosion as a consequence of the formation of active-passive electrochemical cells between the interior of pits and the external surface. The weight loss of AISI 316L inmore » 67CO{sub 2}-33O{sub 2} gas can be ascribed to the high oxidizing power of the gas causing a continuous dissolution of the Cr{sub 2}O{sub 3}layer into a soluble chromate.« less

Authors:
Publication Date:
Research Org.:
ENEA CRE Casaccia, Rome (IT)
OSTI Identifier:
20015579
Resource Type:
Journal Article
Journal Name:
Oxidation of Metals
Additional Journal Information:
Journal Volume: 53; Journal Issue: 1-2; Other Information: PBD: Feb 2000; Journal ID: ISSN 0030-770X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CORROSION; STAINLESS STEEL-316L; IRON ALLOYS; ALUMINIUM ALLOYS; TEMPERATURE RANGE 0400-1000 K; LITHIUM CARBONATES; POTASSIUM CARBONATES; CARBON DIOXIDE; OXYGEN; KINETICS

Citation Formats

Frangini, S. Corrosion behavior of AISI 316L stainless steel and ODS FeAl aluminide in eutectic Li{sub 2}CO{sub 3}-K{sub 2}CO{sub 3} molten carbonates under flowing CO{sub 2}-O{sub 2} gas mixtures[Oxide Dispersion Strengthened]. United States: N. p., 2000. Web. doi:10.1023/A:1004538931676.
Frangini, S. Corrosion behavior of AISI 316L stainless steel and ODS FeAl aluminide in eutectic Li{sub 2}CO{sub 3}-K{sub 2}CO{sub 3} molten carbonates under flowing CO{sub 2}-O{sub 2} gas mixtures[Oxide Dispersion Strengthened]. United States. doi:10.1023/A:1004538931676.
Frangini, S. Tue . "Corrosion behavior of AISI 316L stainless steel and ODS FeAl aluminide in eutectic Li{sub 2}CO{sub 3}-K{sub 2}CO{sub 3} molten carbonates under flowing CO{sub 2}-O{sub 2} gas mixtures[Oxide Dispersion Strengthened]". United States. doi:10.1023/A:1004538931676.
@article{osti_20015579,
title = {Corrosion behavior of AISI 316L stainless steel and ODS FeAl aluminide in eutectic Li{sub 2}CO{sub 3}-K{sub 2}CO{sub 3} molten carbonates under flowing CO{sub 2}-O{sub 2} gas mixtures[Oxide Dispersion Strengthened]},
author = {Frangini, S.},
abstractNote = {A kinetics study on AISI 316L stainless steel and ODS (Oxide-Dispersion-Strengthened) FeAl iron aluminide was conducted concerning its corrosion behavior in molten Li{sub 2}CO{sub 3}-K{sub 2}CO{sub 3} eutectic at 650 C in flowing CO{sub 2}-O{sub 2} gas mixtures. The corrosion resistance of FeAl ODS was demonstrated to be significantly superior to that of austenitic AISI 316L steel under all gas conditions tested in this work. At low CO{sub 2} partial pressure (P{sub CO{sub 2}} = 0.3 atm) the corrosion rate of both alloys decreased with time due to the formation of a protective oxide layer. In dry CO{sub 2} gas, corrosion of AISI steel proceeded at a near-linear rate, indicative of a surface-controlled reaction. FeAl corroded initially following parabolic behavior, but, on further reaction, exhibited some weight loss. A similar behavior was also observed in a 67CO{sub 2}-33O{sub 2} gas mixture. Corrosion of FeAl in high CO{sub 2} gas has been postulated to initiate by acidic fluxing of yttria particles. The attack then develops as pitting and leads to further reaction by general corrosion as a consequence of the formation of active-passive electrochemical cells between the interior of pits and the external surface. The weight loss of AISI 316L in 67CO{sub 2}-33O{sub 2} gas can be ascribed to the high oxidizing power of the gas causing a continuous dissolution of the Cr{sub 2}O{sub 3}layer into a soluble chromate.},
doi = {10.1023/A:1004538931676},
journal = {Oxidation of Metals},
issn = {0030-770X},
number = 1-2,
volume = 53,
place = {United States},
year = {2000},
month = {2}
}