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

alloy

KCl

SIMS

initial oxidation

Alumina

o-2

oxidation

FeCrAl

AES

dry

Author

Josefin Engkvist

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Niklas Israelsson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

U. Bexell

Dalarna university

Surface and Interface Analysis

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

Vol. 45 1 445-448

Subject Categories

Chemical Engineering

DOI

10.1002/sia.5081

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4/1/2019 9