Differentiation in corrosion performance of alumina forming alloys in alkali carbonate melts
Artikel i vetenskaplig tidskrift, 2021

Alkali carbonate melts are promising high temperature thermal storage media. In this work five alumina forming alloys have been exposed to a ternary LiNaK carbonate melt and CO2 at 800 °C. The corrosion propagation was found to depend on the formation of a slow-growing LiAlO2 scale. Furthermore, the two polymorphs contributing to the LiAlO2 phase were monitored for up to 1000 h: a dense α-LiAlO2 scale and γ-LiAlO2 crystallites. We suggest a growth stress assisted formation of α-LiAlO2 relaxing into the outwards growing γ-LiAlO2 phase. This implies a deceleration of the α-LiAlO2 scale growth towards a steady state-thickness.

High temperature corrosion

Molten carbonates

Alumina forming alloys

Phase transition

Lithium aluminate

Författare

Esraa Hamdy Mohamedin

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Michal Strach

Chalmers, Fysik, F forskningsinfrastruktur (CMAL)

Johanna Nockert Olovsjö

Kanthal AB

Christine Geers

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Corrosion Science

0010-938X (ISSN)

Vol. 192 109857

Ämneskategorier

Materialkemi

Metallurgi och metalliska material

Korrosionsteknik

DOI

10.1016/j.corsci.2021.109857

Mer information

Senast uppdaterat

2021-10-13