NDLI: Self-Repairing Metal Oxides

Content Provider	Springer Nature Link
Author	Hultquist, G. Tveten, B. Hörnlund, E. Limbäck, M. Haugsrud, R.
Copyright Year	2001
Abstract	The oxidation of Cu, Zr, and alloys forming chromia, alumina, and zirconia was studied in a closed reaction chamber in O$_{2}$ gas near 20 mbar. Information on the position of oxide growth has been gained from the $^{18}$O/SIMS technique. Rates of O$_{2}$ dissociation on metal oxides, Au, and Pt have been evaluated from measurements in labeled O$_{2}$. The experimental results indicate that hydrogen in the metal substrates induces increased metal-ion transport in internal oxide surfaces during oxidation, which leads to increased oxide growth at the oxide–gas interface. Experiments also show that oxides of rare-earth metals (REM) and Pt catalyze the dissociation of O$_{2}$. An increased rate of O$_{2}$ dissociation can lead to increased transport of oxygen ions in the oxides and increased oxide growth at the substrate–oxide interface. A balanced transport of metal and oxygen ions in metal oxides that leads to oxide growth at both the metal–oxide and at the oxide–gas interface is found to be favorable for the formation of protective oxides with good adherence to the metal substrate. Depending on the original proporation of metal–to–oxygen ion transport in the oxide, an addition of hydrogen will increase or decrease the oxidation kinetics. In analogy, an addition of REM will increase or decrease the oxidation kinetics, depending on the original proportion of metal-to-oxygen ion transport.
Starting Page	313
Ending Page	346
Page Count	34
File Format	PDF
ISSN	0030770X
Journal	Oxidation of Metals
Volume Number	56
Issue Number	3-4
e-ISSN	15734889
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Physical Chemistry Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Inorganic Chemistry

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