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Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

Niklas Israelsson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; K. A. Unocic ; Kristina Hellström (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Jan-Erik Svensson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Lars-Gunnar Johansson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Oxidation of metals (0030-770X). Vol. 84 (2015), 3-4, p. 269-290.
[Artikel, refereegranskad vetenskaplig]

The KCl-induced corrosion of the FeCrAl alloy Kanthal® APMT in an O2 + N2 + H2O environment was studied at 600 °C. The samples were pre-oxidized prior to exposure in order to investigate the protective nature of alumina scales in the present environment. The microstructure and composition of the corroded surface was investigated in detail. Corrosion started at flaws in the pre-formed α-alumina scales, i.e. α-alumina was protective in itself. Consequently, KCl-induced corrosion started locally and, subsequently, spread laterally. An electrochemical mechanism is proposed here by which a transition metal chloride forms in the alloy and K2CrO4 forms at the scale/gas interface. Scale de-cohesion is attributed to the formation of a sub-scale transition metal chloride.

Nyckelord: FeCrAl, High temperature corrosion, KCl, Pre-oxidation, Water vapour



Denna post skapades 2015-09-28. Senast ändrad 2015-10-21.
CPL Pubid: 223304

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Oorganisk miljökemi

Ämnesområden

Materialkemi
Oorganisk kemi

Chalmers infrastruktur