Effect of Oxygen Concentration in Static Pb-Bi Eutectic on Corrosion Mode of Aluminum-Alloyed Austenitic Steels at 550 °C for 1000 h

Valentyn Tsisar; Zhang Jian Zhou; Olaf Wedemeyer; Aleksandr Skrypnik; Carsten Schroer

doi:10.4028/www.scientific.net/MSF.1024.79

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HomeMaterials Science ForumMaterials Science Forum Vol. 1024Effect of Oxygen Concentration in Static Pb-Bi...

Effect of Oxygen Concentration in Static Pb-Bi Eutectic on Corrosion Mode of Aluminum-Alloyed Austenitic Steels at 550 °C for 1000 h

Abstract:

Corrosion behavior of Fe-18Ni-12Cr-2.30Al and Fe-18Ni-12Cr-2.90Al-Nb-C austenitic steels was investigated in static Pb-Bi eutectic at 550 °C for 1000 h depending on the concentration of dissolved oxygen in the liquid metal. In the concentration range from 10¹² to 10⁸ mass % O, both steels underwent corrosion via dissolution resulted in the formation of spongy ferrite layer depleted in Ni and Cr and penetrated by Pb and Bi. In Pb-Bi with 10⁶ mass % O, Fe-18Ni-12Cr-2.90Al-Nb-C steel oxidizes with formation of very thin (≤ 1 μm) Cr/Al oxide film while Fe-18Ni-12Cr-2.30Al steel shows mixed corrosion behavior represented by more intensive oxidation and dissolution. The features of corrosion response are discussed depending on the composition of steels and concentration of dissolved oxygen in the Pb-Bi eutectic.

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Materials Science Forum (Volume 1024)

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79-85

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https://doi.org/10.4028/www.scientific.net/MSF.1024.79

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Online since:

March 2021

Authors:

Valentyn Tsisar*, Zhang Jian Zhou, Olaf Wedemeyer, Aleksandr Skrypnik, Carsten Schroer

Keywords:

Aluminum-Alloyed Austenitic Steels, Corrosion, Pb-Bi Eutectic

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