In Situ ESEM Investigation of KCl-Induced Corrosion of a FeCrAl and a Model FeNiCrAl Alloy in Lab Air at 450 degrees C
Journal article, 2015

The very early stages of KCl-induced corrosion of a FeCrAl and a FeNiCrAl alloy in an 0211420 environment were studied using in-situ Environmental Scanning Electron Microscopy (ESEM). The samples were KCl contaminated and then exposed to lab air at a total pressure of 4.8 Ton at 450 degrees C. After exposure, the samples were analyzed using SEM-EDX, FIB and STEM-EDX. For both alloys, fast oxide growth occurred at the KCl particles. Far away from the KCl particles, a thin base oxide formed with potassium chromate nodules on top. The base oxide was layered, consisting of iron-chromium oxide on top and alumina in the bottom part. The FeCrAl alloy suffered internal oxidation while the FeNiCrAl did not. Both alloys formed sub-scale chlorides. A mechanism is proposed for the reaction of KCl on the surface and for the formation of different surface features at the KCl particles.

v56

Materials Science

rmany

initial-stages

kanthal af

p801

water-vapor

superheater materials

sanicro 28

oxide scale

oxidation

biomass

high-temperature corrosion

dry o-2

Electrochemistry

Author

Nooshin Mortazavi Seyedeh

Chalmers, Applied Physics, Materials Microstructure

Luciana Intiso

Chalmers, Applied Physics, Materials Microstructure

Niklas Israelsson

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Lars-Gunnar Johansson

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Mats Halvarsson

Chalmers, Applied Physics, Materials Microstructure

Journal of the Electrochemical Society

0013-4651 (ISSN) 1945-7111 (eISSN)

Vol. 162 14 C744-C753

Subject Categories

Metallurgy and Metallic Materials

Areas of Advance

Materials Science

DOI

10.1149/2.0581514jes

More information

Latest update

9/7/2023 1