Microstructures of oxide films formed in alloy 182 BWR core shroud support leg cracks

This paper contributes to a TEM examination on the oxide films formed at three locations along a crack path in Alloy 182 weld from a BWR core shroud support leg, namely, the crack mouth, the midway between the mouth and the crack tip, and the crack tip. In the crack mouth the oxide film was approximately 1.6 μm in thickness and consisted of relatively pure NiO. The midway oxide film was mainly a nickel chromium oxide with a film thickness of 0.3 μm. At the crack tip the oxide film was a nickel chromium iron oxide with a film thickness of 30 nm. In all studied locations the main oxides had the similar rocksalt structure and the cracks were much wider than the thicknesses of the oxide films. It probably suggests that the corroded metal was largely dissolved into the coolant. The different dissolution rates of nickel, chromium and iron cations in the oxide films are clearly displayed with the compositions of the residual oxides. The oxide stability under different redox potentials along the crack path is briefly discussed.

NATURVETENSKAP Kemi Materialkemi hsv//swe
NATURAL SCIENCES Chemical Sciences Materials Chemistry hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Kemiteknik Korrosionsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Corrosion Engineering hsv//eng
BWR
Core shroud
Crack
FIB
Oxide microstructure
SEM
Support leg
TEM
Boiling water reactors
Chromium
Chromium compounds
Crack propagation
Crack tips
Cracks
Film thickness
Iron oxides
Microstructure
Nickel
Nickel oxide
Nuclear energy
Nuclear fuels
Redox reactions
Scanning electron microscopy
Transmission electron microscopy
Crack paths
Dissolution rates
Iron cations
Nickel chromium
Redox potentials
Residual oxides
Rock-salt structure
Oxide films

Jädernäs, DanielStudsvik Nuclear AB, Sweden,Studsvik (author)
Lindberg, FfredrikRISE,KIMAB (author)
Pettersson, Henrik,1975Chalmers University of Technology, Sweden,Chalmers tekniska högskola(Swepub:cth)hepe (author)
Bjurman, MartinStudsvik Nuclear AB, Sweden,Studsvik (author)
Kese, KwadwoStudsvik Nuclear AB, Sweden,Studsvik (author)
Jenssen, AndersStudsvik Nuclear AB, Sweden,Studsvik (author)
Cocco, MassimoForsmark Kraftgrupp AB, Sweden (author)
Johansson, HannaForsmark Kraftgrupp AB, Sweden (author)
Studsvik Nuclear AB, SwedenStudsvik (creator_code:org_t)

In:Miner. Met. Mater. Ser.Cham : Springer International PublishingPart F11, s. 417-4319783319684536
In:Minerals, Metals and Materials SeriesCham : Springer International PublishingPart F11, s. 417-4312367-16962367-1181

By the author/editor: Chen, Jiaxin; Jädernäs, Daniel; Lindberg, Ffredr ...; Pettersson, Henr ...; Bjurman, Martin; Kese, Kwadwo; show more...; Jenssen, Anders; Cocco, Massimo; Johansson, Hanna; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Corrosion Engine ...

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