Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0013-4686(03)00605-4
Title: Passivity behavior of melt-spun Mg-Y Alloys
Authors: Yao, H.B.
Li, Y. 
Wee, A.T.S. 
Keywords: Incorporation
Native film
Passive film
Passivity
Issue Date: 15-Dec-2003
Citation: Yao, H.B., Li, Y., Wee, A.T.S. (2003-12-15). Passivity behavior of melt-spun Mg-Y Alloys. Electrochimica Acta 48 (28) : 4197-4204. ScholarBank@NUS Repository. https://doi.org/10.1016/S0013-4686(03)00605-4
Abstract: Several Mg-Y binary ribbons with Y content up to ∼ 17.9 at.% were fabricated by melt-spinning. X-ray diffraction (XRD) revealed that the phase structure changes with increasing Y content from extended solid solution to partially amorphous, and then fully intermetallic Mg24Y5. Anodic potentiodynamic polarization performed in 0.01M NaCl electrolyte (pH = 12) revealed improved anodic passivity behavior compared to pure Mg for all the Mg-Y alloys. X-ray photoelectron spectroscopy (XPS) revealed that the improved passivity of Mg-Y was more related to the elemental oxidation state rather than the concentration of the surface components. To study the effect of Cl - ion on the passivity behavior, anodic potentiodynamic and potentiostatic polarization were performed on Mg-17.9at.% Y in alkaline (pH = 12) NaCl electrolytes containing Cl- ion in the concentration range from 0.00 to 0.50 M. The passive films formed in 0.01 M NaCl electrolyte were similar to the native film, which were composed of MgO and Y2O 3. No CO3 2- and Cl- ions were incorporated into the passive film. The passivity was significantly degraded in the electrolytes containing higher Cl- concentration (0.1 and 0.5 M). Detailed XPS revealed that the surface films under these conditions were composed of much hydrated species Mg(OH)2 and YOOH and/or Y(OH) 3 and CO3 2- was incorporated into the surface film. The incorporation of Y2O3 in the passive film was given as the reason for the enhanced passivity properties of Mg-Y ribbons. The mechanism of Cl- and CO3 2- ions to the degradation of the passivity was discussed. © 2003 Elsevier Ltd. All rights reserved.
Source Title: Electrochimica Acta
URI: http://scholarbank.nus.edu.sg/handle/10635/97497
ISSN: 00134686
DOI: 10.1016/S0013-4686(03)00605-4
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

71
checked on Jul 13, 2018

WEB OF SCIENCETM
Citations

64
checked on Jun 12, 2018

Page view(s)

36
checked on Jun 8, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.