Chromia Scale Growth in Alloy Oxidation and the Reactive Element Effect

1993 ◽  
Vol 140 (10) ◽  
pp. 2844-2850 ◽  
Author(s):  
Bernard Pieraggi ◽  
Robert A. Rapp
Keyword(s):  
Reactive Element ◽  
Chromia Scale ◽  
Reactive Element Effect ◽  
Scale Growth ◽  
Alloy Oxidation

The reactive element effect on thermally grown chromia scale residual stress

2003 ◽  
Vol 343 (1-2) ◽  
pp. 257-264 ◽  
Author(s):  
S Chevalier ◽  
C Valot ◽  
G Bonnet ◽  
J.C Colson ◽  
J.P Larpin
Keyword(s):  
Residual Stress ◽  
Reactive Element ◽  
Chromia Scale ◽  
Reactive Element Effect ◽  
Thermally Grown

Reactive Element Effect Applied by Alloying and SiHfBCN Coating on the Oxidation of Pure Chromium

2019 ◽  
Vol 92 (3-4) ◽  
pp. 281-302 ◽  
Author(s):  
Anke S. Ulrich ◽  
Timo Kaiser ◽  
Emanuel Ionescu ◽  
Ralf Riedel ◽  
Mathias C. Galetz
Keyword(s):  
Reactive Element ◽  
Reactive Element Effect ◽  
Pure Chromium

Pulsed Laser Deposition in a Zinc Alloy Corrosion Study

2003 ◽  
Vol 780 ◽  
Author(s):  
R. Guerrero-Penalva ◽  
M.H. Farías ◽  
L. Cota-Araiza
Keyword(s):  
Pulsed Laser Deposition ◽  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Reactive Element ◽  
General Mechanism ◽  
Zinc Alloy ◽  
Reactive Element Effect ◽  
X Ray

AbstractA significant improvement in corrosion resistance of the protecting oxide of alloys has been observed when adding small amounts of reactive elements, such as yttrium, this effect has been called reactive element effect (REE). The general mechanism of the REE has not been determined yet. In this work, we study a growing of a yttrium oxide film and its interaction with the phases η and α that constitutes the alloy Zn-22Al-2Cu named ZinalcoTM The alloy's surface was coated by a pulsed laser deposition technique. The deposit is controlled and characterized by x-ray photoelectron spectroscopy. The mechanism by which the reactive element produce its effects in this alloy is explained by the preferential interaction among the active sites related to the zinc rich phase and enhancing aluminum movement toward the surface where it is oxidized and the protection film formed.

The reactive element effect in commercial ODS FeCrAI alloys

1995 ◽  
Vol 13 (1) ◽  
pp. 3-16 ◽  
Author(s):  
B. A. Pint ◽  
A. J. Garratt-Reed ◽  
L. W. Hobbs
Keyword(s):  
Reactive Element ◽  
Reactive Element Effect

On the exclusive growth of external chromia scale on the novel electrodeposited Cu–Ni–Cr nanocomposites

2007 ◽  
Vol 22 (11) ◽  
pp. 3166-3177 ◽  
Author(s):  
Z. Huang ◽  
X. Peng ◽  
C. Xu ◽  
F. Wang
Keyword(s):  
Theoretical Treatment ◽  
Content Increase ◽  
The Novel ◽  
Chromia Scale ◽  
Two Phase ◽  
Metal Matrix Nanocomposites ◽  
Ultrafine Grained ◽  
Alloy Oxidation ◽  
Solid Solution Matrix ◽  
Matrix Nanocomposites

Novel metal-matrix nanocomposites (MMNCs) of Cu–30Ni–20Cr and Cu–50Ni–20Cr (by wt%), having a nanocrystalline Cu–Ni solid solution matrix with the dispersion of Cr nanoparticles, were fabricated by coelectrodeposition. Both nanocomposites exclusively grew external chromia scale during oxidation at 800 °C in air. The codeposited Cr nanoparticles, together with the numerous grain boundaries in the Cu–Ni matrix, promoted the establishment of a continuous chromia scale during the initial and transient oxidation stage, and then they functioned as “a reservoir” supplying sufficient Cr flux for the exclusive growth of the scale during the steady-state stage. The theoretical treatment using a two-phase alloy oxidation model indicates that high Cr diffusivity correlated with the persistence of an ultrafine-grained structure of the Cu–Ni matrix during oxidation is crucial to the exclusive chromia growth. Ni content increase did not significantly affect the chromia scale formation. This is fundamentally different from the oxidation of conventional Cu–Ni–Cr alloys investigated for comparison.

Computer simulation of the reactive element effect in NiO grain boundaries

2000 ◽  
Vol 48 (12) ◽  
pp. 3039-3048 ◽  
Author(s):  
D.J Harris ◽  
J.H Harding ◽  
G.W Watson
Keyword(s):  
Computer Simulation ◽  
Grain Boundaries ◽  
Reactive Element ◽  
Reactive Element Effect

The reactive element effect (R.E.E.) : a tentative classification

1993 ◽  
Vol 03 (C9) ◽  
pp. C9-281-C9-290
Author(s):  
J. Maximilien N'gandu-Muamba ◽  
Roland Streiff
Keyword(s):  
Reactive Element ◽  
Reactive Element Effect
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