Corrosion resistance of in-situ growth of nano-sized Mg(OH) 2 on micro-arc oxidized magnesium alloy AZ31-Influence of EDTA

Li, C, Fan, X, Zeng, R and Jiang, H., et al, 2019, 'Corrosion resistance of in-situ growth of nano-sized Mg(OH) 2 on micro-arc oxidized magnesium alloy AZ31-Influence of EDTA', Journal of Materials Science and Technology, vol. 35, no. 6, pp. 1088-1098.


Document type: Journal Article
Collection: Journal Articles

Title Corrosion resistance of in-situ growth of nano-sized Mg(OH) 2 on micro-arc oxidized magnesium alloy AZ31-Influence of EDTA
Author(s) Li, C
Fan, X
Zeng, R
Jiang, H., et al,
Year 2019
Journal name Journal of Materials Science and Technology
Volume number 35
Issue number 6
Start page 1088
End page 1098
Total pages 11
Publisher Zhongguo Kexueyuan Jinshu Yanjiusuo
Abstract One of the major obstacles for the clinical use of biodegradable magnesium (Mg)-based materials is their high corrosion rate. Micro-arc oxidation (MAO) coatings on Mg alloys provide mild corrosion protection owing to their porous structure. Hence, in this study a dense Mg(OH) 2 film was fabricated on MAO-coated Mg alloy AZ31 in an alkaline electrolyte containing ethylenediamine tetraacetic acid disodium (EDTA-2Na) to reinforce the protection. Surface morphology, chemical composition and growth process of the MAO/Mg(OH) 2 hybrid coating were examined using field-emission scanning electron microscopy, energy dispersive X-ray spectrometer, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectrophotometer. Corrosion resistance of the coatings was evaluated via potentiodynamic polarization curves and hydrogen evolution tests. Results manifested that the Mg(OH) 2 coating possesses a porous nano-sized structure and completely seals the micro-pores and micro-cracks of the MAO coating. The intermetallic compound of AlMn phase in the substrate plays a key role in the growth of Mg(OH) 2 film. The current density of Mg(OH) 2 -MAO composite coating decreases three orders of magnitude in comparison with that of bare substrate, indicating excellent corrosion resistance. The Mg(OH) 2 -MAO composite coating is beneficial to the formation of calcium phosphate corrosion products on the surface of Mg alloy AZ31, demonstrating a great promise for orthopaedic applications.
Subject Metals and Alloy Materials
Keyword(s) Biomaterials
Coatings
Magnesium alloys
Magnesium hydroxide
Micro-arc oxidation
DOI - identifier 10.1016/j.jmst.2019.01.006
Copyright notice © 2019
ISSN 1005-0302
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 0 times in Scopus Article
Altmetric details:
Access Statistics: 9 Abstract Views  -  Detailed Statistics
Created: Mon, 29 Apr 2019, 13:04:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us