Nanocrystalline Zinc-Based Composite Coatings for Corrosion Protection and Cytocompatibility of the Biomedical WE43 Magnesium Alloy

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review

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Author(s)

Detail(s)

Original languageEnglish
Title of host publication20th Science Council of Asia Conference
Subtitle of host publicationThe Age of New Materials : Innovation for Sustainable Society - Abstract
Publication statusPublished - May 2021

Conference

Title20th Science Council of Asia Conference
Locationconference on-site or via on-line conference system
PlaceChina
CityGuangzhou, Guangdong
Period13 - 15 May 2021

Abstract

Practical application of magnesium (Mg) alloys to bone fixation implants is hampered by rapid degradation under physiological conditions. Herein, a nanocrystalline zinc (Zn) coating is electrodeposited on the WE43 Mg alloy followed by a chemical conversion treatment to produce a titania-zinc phosphate layer. The Zn coating has a rice-like nanostructure and the conversion layer is composed of Zn3(PO4)2, ZnO, and TiO2. The Zn coating reduces the corrosion current density of the WE43 Mg alloy from 151.1 ± 13.8 μA cm−2 to 29.4 ± 7.4 μA cm−2 in the simulated body fluid (SBF), while the composite coating decreases it to 4.1 ± 0.8 μA cm−2 . The surface morphology, pH variation, and average corrosion rates after immersion for 7 days in SBF reveal that the zinc coating accelerates dissolution of the Mg substrate due to formation of galvanic couples between the Zn coating and Mg alloy substrate. In comparison, only slight corrosion is observed from limited areas on the sample with the composite coating. The titania-Zn phosphate/nanocrystalline Zn composite coating provides long-term protection in the physiological environment and the protection mechanism is discussed. Furthermore, attachment of MC3T3-E1 pre-osteoblasts in vitro demonstrates enhanced cytocompatibility due to the composite coating.

Research Area(s)

  • Orthopedic implants, Biodegradable magnesium alloys, Coatings, Corrosion, Cytocompatibility, Nanocrystalline zinc

Citation Format(s)

Nanocrystalline Zinc-Based Composite Coatings for Corrosion Protection and Cytocompatibility of the Biomedical WE43 Magnesium Alloy. / Li, Jingyao; LI, Jian; Jin, Weihong; Yu, Zhentao; Chu, Paul K.

20th Science Council of Asia Conference: The Age of New Materials : Innovation for Sustainable Society - Abstract. 2021.

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review