The initial effect of KCl deposit on alumina scales characterized by ToF-SIMS and AES
Artikel i vetenskaplig tidskrift, 2013

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.

KCl

oxidation

initial oxidation

dry

AES

o-2

FeCrAl

SIMS

alloy

Alumina

Författare

Josefin Hall

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Niklas Israelsson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

U. Bexell

Hogskolan Dalarna

Surface and Interface Analysis

0142-2421 (ISSN) 1096-9918 (eISSN)

Vol. 45 445-448

Ämneskategorier

Kemiteknik

DOI

10.1002/sia.5081