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

Seyedeh Nooshin Mortazavi (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; Luciana Intiso (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; N. Israelsson ; L. G. Johansson ; Mats Halvarsson (Institutionen för teknisk fysik, Materialens mikrostruktur )
Journal of the Electrochemical Society (0013-4651). Vol. 162 (2015), 14, p. C744-C753.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: high-temperature corrosion, superheater materials, initial-stages, water-vapor, oxide scale, kanthal af, sanicro 28, dry o-2, oxidation, biomass, Electrochemistry, Materials Science, rmany, v56, p801


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CPL Pubid: 230907

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Materialvetenskap
Metallurgi och metalliska material

Chalmers infrastruktur