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The Influence of Cr Evaporation on Long Term Cr Depletion Rates in Ferritic Stainless Steels

Rakshith Nugehalli Sachitanand (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Jan-Erik Svensson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Jan Froitzheim (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Oxidation of Metals (0030-770X). Vol. 84 (2015), 3-4, p. 241-257.
[Artikel, refereegranskad vetenskaplig]

It is shown that well defined flow rates are an essential parameter in oxidation experiments influenced by scale volatilisation. The 22 % Cr ferritic steel Sanergy HT, intended for use as an SOFC interconnect material, was exposed discontinuously over 3100 h at 850 °C in air + 3 % H2O @ 6000 sml min−1 (27 cm s−1) and stagnant conditions in a tubular reactor. Time resolved isothermal Cr evaporation measurements over 1000 h were also performed in the 6000 sml min−1 case while the stagnant exposure environment was saturated in Cr(VI) species to suppress any evaporation reactions. Mass balances based on oxidation and evaporation data were in good agreement with SEM/EDX bulk Cr concentration measurements. The time to a bulk concentration of 15 wt% Cr increased by ≈2× from ≈3000 to ≈5500 h when evaporation was suppressed. Further, it was established that a suppressed evaporation reaction affected not just the magnitude of Cr depletion in the steel but even its long term depletion rate.

Nyckelord: Cr depletion, Cr evaporation, Ferritic stainless steel, Interconnect, Lifetime, SOFC



Denna post skapades 2015-09-29. Senast ändrad 2017-09-14.
CPL Pubid: 223319

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Oorganisk miljökemi

Ämnesområden

Materialkemi
Oorganisk kemi

Chalmers infrastruktur