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The initial effect of KCl deposit on alumina scales characterized by ToF-SIMS and AES

Josefin Engkvist (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Niklas Israelsson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; U. Bexell
Surface and Interface Analysis (0142-2421). Vol. 45 (2013), 1, p. 445-448.
[Artikel, refereegranskad vetenskaplig]

A FeCrAl alloy was preoxidized to form a protective alumina scale, and the effect of KCl deposits on the alumina scale was investigated while exposed during 1 and 24 h at 600 degrees C. However, impurity concentrations in the alumina scale change the ion conductivity and hence affect its protective properties. Therefore, Auger electron spectroscopy and time-of-flight secondary ion mass spectrometry were used to characterize the alumina scales and detect traces of K and Cl. The results showed that K and Cl existed as large sharp-edged crystals surrounded by a dendritic network after 1 h. However, after 24 h, those were dissolved, and K together with Cl was detected only in the outer layer of the duplex alumina scale, which was formed during preoxidation.

Nyckelord: SIMS, AES, FeCrAl, Alumina, KCl, initial oxidation, oxidation, alloy, o-2, dry

Denna post skapades 2013-07-10.
CPL Pubid: 180069


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)



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