Abstract
Oxidation of 99?99% pure nickel was studied with and without 0?10 mg cm22 KCl(s) in an
environment containing 5 vol.-%O2, 40 vol.-%H2O and 55 vol.-%N2 at 600uC for up to 168 h.
Oxide microstructure was investigated by X-ray diffraction (XRD), focused ion beam (FIB), broad
ion beam (BIB) and SEM/EDX. Oxidised nickel shows an approximately parabolic oxide growth
rate. The oxide scale is dense with some pores at the oxide/metal interface. Adding small
amounts of KCl does not result in a faster corrosion rate of nickel. However, the surface
morphology changes and small oxide crusts were observed in the vicinity of former KCl particles.
This is proposed to be the result of a NiCl2–KCl eutectic on top of the oxide scale formed above
514uC. The oxide scale formed in the presence of KCl contains more and differently distributed
voids than the scale formed without KCl.
Original language | English |
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Journal | Materials at High Temperatures |
Volume | 32 |
Issue number | 1-2 |
Pages (from-to) | 44-49 |
ISSN | 0960-3409 |
DOIs | |
Publication status | Published - 2015 |
Bibliographical note
This article is part of a special issue on Microscopy of Oxidation 9Keywords
- Nickel
- KCl
- High temperature corrosion
- 600 C
- Electron microscopy