Differentiation in corrosion performance of alumina forming alloys in alkali carbonate melts
Journal article, 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

Author

Esraa Hamdy Mohamedin

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

Michal Strach

Chalmers, Physics, CMAL

Johanna Nockert Olovsjö

Kanthal AB

Christine Geers

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

Corrosion Science

0010-938X (ISSN)

Vol. 192 109857

Subject Categories

Materials Chemistry

Metallurgy and Metallic Materials

Corrosion Engineering

DOI

10.1016/j.corsci.2021.109857

More information

Latest update

10/13/2021