A study of oxidation behavior of AZ91D alloy with YSZ coating using EIS

Journal: Vol. 10, No.1, 2017 - Article 2   Pages :  1 Until 12

Article Code:

A. Shahriari: University of Tabriz - Department of Materials Engineering,Faculty of Mechanical Engineering
H. Aghajani: University of Tabriz - Department of Materials Engineering,Faculty of Mechanical Engineering
M.G. Hosseini: Tabriz university - Department of Physical Chemistry,Faculty of Chemistry

Article's abstract:

Oxidation behavior of AZ91D magnesium alloy with 3YSZ coating and aluminum interlayer was studied in air at 250 °C using electrochemical impedance spectroscopy EIS, scanning electron microscopy SEM, and X-ray diffraction XRD. The oxidation process was carried out in various duration times from 1 to 10 h. A three-electrode electrochemical cell was employed for all the EIS measurements. Also, to focus on the characteristics of the oxide films, a nonaggressive electrolyte 0.1 M Na2SO4 was used. The EIS data were interpreted with a two-layered model, and the obtained capacitance and resistance are related to the thickness and defectiveness of YSZ coating and oxide film which was formed during the oxidation process. The results showed that after 6 h of oxidation time, the defects are produced in YSZ coating and it helps to increase the thickness of the oxide film. Also, XRD results revealed that the oxide films were mainly composed of Al2O3 and MgAl2O4 phases. The oxide film remained protective during extra oxidation period. In addition, the electrochemical model was supported by SEM observations.

Electrochemical impedance spectroscopy, Oxide film, AZ91D, YSZ.

1. J. Chen, et al., Corrosion behavior of AZ91D magnesium alloy in sodium sulfate solution, Materials and Corrosion., 57 (2006), 789-793. 2. F. Czerwinski, The oxidation behaviour of an AZ91D magnesium alloy at high temperatures, Acta Materialia., 50 (2002), 2639-2654. 3. G. Baril, C. Blanc, and N. Pébère, AC impedance spectroscopy in characterizing time-dependent corrosion of AZ91 and AM50 magnesium alloys characterization with respect to their microstructures, Journal of the Electrochemical Society., 148 (2001), B489-B496. 4. G.-L. Song, Corrosion of magnesium alloys : Woodhead Publishing Limited, Philadelphia, 2011, chap 1. 5. A. Pardo, et al., Corrosion behaviour of magnesium/aluminium alloys in 3.5 wt.% NaCl, Corrosion Science., 50 (2008), 823-834. 6. J. Gray, and B. Luan, Protective coatings on magnesium and its alloys—a critical review, Journal of alloys and compounds., 336 (2002), 88-113. 7. M.S. Ali, S. Song, and P. Xiao, Evaluation of degradation of thermal barrier coatings using impedance spectroscopy, Journal of the European Ceramic Society., 22 (2002), 101-107. 8. A. Shahriari, H. Aghajani, and M. Hosseini, Corrosion resistance enhancement of AZ91 magnesium alloy using Ni-P interlayer and electrophoretic deposited 3YSZ coating, Progress in Color, Colorants and Coatings., 9 (2016), 151-162. 9. M.F. De Riccardis, Ceramic Coatings Obtained by Electrophoretic Deposition: Fundamentals, Models, Post-Deposition Processes and Applications: INTECH Open Access Publisher, 2012, 43-68. 10. Z. Wang, P. Xiao, and J. Shemilt, Fabrication of composite coatings using a combination of electrochemical methods and reaction bonding process, Journal of the European Ceramic Society., 20 (2000), 1469-1473. 11. J.A. Haynes, et al., Oxidation and degradation of a plasma-sprayed thermal barrier coating system, Surface and Coatings Technology., 86 (1996), 102-108. 12. J.M.West, Basic corrosion and oxidation: Ellis Horwood, Chichester, 1986, Chaps. 9, 13 and 14. 13. L.L. Shreir, R. Jarman, and G. Burstein, Metal/environment reactions: Corrosion, vol. 1,. Butterworth Heinemann, 1994, 14. P. Kofstad, High temperature corrosion: Elsevier Applied Science Publishers, Crown House, Linton Road, Barking, 1988, chap.1. 15. F. Mansfeld, Recording and analysis of AC impedance data for corrosion studies, Corrosion., 37 (1981), 301-307. 16. J. Macdonald, WB Johnson in: JR Macdonald (Ed.), Impedance Spectroscopy: Wiley, New York, 1987, chap 4. 17. N. Cogger, and N. Evans, An introduction to electrochemical impedance measurement technique report, no. 6. Solartron Instrument, 1999. 18. A.J. Bard, and L.R. Faulkner, Electrochemical methods: fundamentals and applications: Wiley, Chichester, 1980, chap 9. 19. X.Peng, and D.R. Clarke, Piezospectroscopic analysis of interface debonding in thermal barrier coatings, Journal of the American Ceramic Society., 83 (2000), 1165-1170. 20. K.uttner, and W. Lorenz, The role of surface inhomogenities in corrosion processes electrochemical impedance spectroscopy (EIS) on different aluminum oxide films, Corrosion Science., 29 (1989), 279-288. 21. J. Pan, et al., Characterization of high-temperature oxide films on stainless steels by electrochemical-impedance spectroscopy, Oxidation of Metals., 50 (1998), 431-455. 22. G. Baril, N. Pebere., The corrosion of pure magnesium in aerated and deaerated sodium sulphate solutions., Corrosion Science., 43 (2001), 471-484. 23. F. Mansfeld, Analysis and interpretation of EIS data for metals and alloys, Technical Report 26, Solartron -Schlumb erger, England, 1993, chap 4. 24. S. Song, and P. Xiao, An impedance spectroscopy study of high-temperature oxidation of thermal barrier coatings, Materials Science and Engineering: B, 97 (2003), 46-53. 25. JR. Macdonald, E. Barsoukov, Impedance spectroscopy: theory, experiment, and applications, Wiley

Article's file
Page view: 814
Article's download quantity : 18

Article System Login

Prof. Zahra Ranjbar
Dr. Farahnaz Nourmohammadian
Assistant Editor:
Dr. Mozhgan Hosseinnezhad
ISSN (online):
Institute for Color Science and Technology (ICST)

Quick Access
What is your opinion about the manuscript subscription system of PCCC website?
Website Statistics
Page view:815
Online Visitors:47