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Effect of annealing below the crystallization temperature on the corrosion behavior of Al-Ni-Y metallic glasses

DSpace at IIT Bombay

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Title Effect of annealing below the crystallization temperature on the corrosion behavior of Al-Ni-Y metallic glasses
 
Creator JINDAL, R
RAJA, VS
GIBSON, MA
STYLES, MJ
BASTOW, TJ
HUTCHINSON, CR
 
Subject Aluminum
Polarization
EIS
Amorphous structures
Segregation
Passivity
IRREVERSIBLE STRUCTURAL RELAXATION
AMORPHOUS-ALLOYS
DEVITRIFICATION
PASSIVATION
RESISTANCE
PASSIVITY
ALUMINUM
KINETICS
 
Description The effect of thermally-induced surface segregation on the electrochemical corrosion behavior of Al-Ni-Y amorphous alloys was investigated by potentiodynamic polarization and electrochemical impedance techniques. Annealing below the crystallization temperature at 150 degrees C for 5 min caused a reduction in passive current density and improved polarization resistance. Synchrotron X-ray diffraction patterns showed no change in structure while nuclear magnetic resonance spectra confirmed no change in chemical ordering or structural relaxation within the glass. The surface segregation of yttrium, as confirmed by X-ray photoelectron spectroscopy, after annealing below the crystallization temperature is proposed to be responsible for the improved passivity. (C) 2014 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-12-28T17:37:57Z
2014-12-28T17:37:57Z
2014
 
Type Article
 
Identifier CORROSION SCIENCE, 8454-65
0010-938X
1879-0496
http://dx.doi.org/10.1016/j.corsci.2014.03.015
http://dspace.library.iitb.ac.in/jspui/handle/100/17008
 
Language English