NDLI: The Effect of Particle Size on the Oxidation Resistance of a Nanoceria-Coated 304 Stainless Steel

Content Provider	Springer Nature Link
Author	Lopez, Hugo F. Zhang, Haiying
Copyright Year	2013
Abstract	In this work, the oxidation resistance of 304 stainless steel (SS) in the uncoated and nanoceria-coated conditions was investigated at 1073 K and 1273 K (800 °C and 1000 °C) under dry air conditions. It was found that nanoceria coatings with average particle sizes of 10 nm were effective enough to fully protect the 304 SS from oxidation. In particular, when the average nanoceria particle size in the coating was less than 5 nm, the coatings were highly efficient in hindering the oxidation susceptibility of the 304 SS. Improvements in the oxidation resistance of up to two orders of magnitude were experimentally found in this work. Finite elements were used in solving Fick’s Second Law using the Crank–Nicholson method in order to elucidate the active oxidation mechanisms in the bare and nanoceria-coated 304 SS. Oxygen penetration profiles across the scale were predicted suggesting that in the absence of a nanoceria coating, the oxygen concentration at a given scale depth is three times as high as in the nanoceria-coated samples. Moreover, kinetic simulations for scale growth through an exponential term containing a factor λ were satisfactory in predicting the experimental outcome on mass gain vs time. Ostwald-Ripening mechanisms were considered to be active during the dissolution of nanoceria particles. It was found that when average particle sizes fall below 5 nm in size, they tend to dissolve immediately, but the dissolution times become exceedingly long when the particle sizes increase above 10 nm.
Starting Page	2297
Ending Page	2308
Page Count	12
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	45
Issue Number	4
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2014-01-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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