Skip to Main content Skip to Navigation
Journal articles

Hybrid coatings with collagen and chitosan for improved bioactivity of Mg alloys

Laura C. Córdoba 1, 2, * Andreia Marques 1, * Maryna Taryba 1, * Thibaud Coradin 2, * Fatima Montemor 1, *
* Corresponding author
2 MATBIO - Matériaux et Biologie
LCMCP - Laboratoire de Chimie de la Matière Condensée de Paris
Abstract : Bi-layered functional coatings were developed to modify the surface of AZ31 and ZE41 Mg alloys intended as biodegradable implant materials for bone repair applications. An inner silane-TiO2 coating was designed to slow down the degradation rate of Mg alloys while a top-most biopolymer layer, composed of collagen or chitosan, was intended to improve bioactivity and biocompatibility of the alloys. Scanning vibrating electrode technique (SVET) and scanning ion-selective technique (SIET) were used to study the localized corrosion phenomena and localized pH evolution of silane-TiO2 coated Mg alloys. Electrochemical impedance spectroscopy (EIS) evaluation of bi-layered alloys in simulated body fluid (SBF) showed that the presence of the biopolymers promotes formation of carbonated compounds within the corrosion products. Localized electrochemical impedance spectroscopy (LEIS) results revealed that the top-most biopolymer layers do not have a detrimental effect on the barrier properties of the silane-TiO2 coating. Indeed, formation of gas pockets evidenced that collagen and chitosan layers trap evolved H2 avoiding its release into the solution at early stages of immersion. The here reported results contribute to elucidate the corrosion mechanisms of AZ31 and ZE41 Mg alloys on the long term in a biological context and provide promising insights into their control via a multilayered coatings.
Document type :
Journal articles
Complete list of metadatas

Cited literature [32 references]  Display  Hide  Download

https://hal.sorbonne-universite.fr/hal-01585205
Contributor : Gestionnaire Hal-Upmc <>
Submitted on : Tuesday, September 12, 2017 - 11:35:56 AM
Last modification on : Wednesday, October 14, 2020 - 4:09:58 AM
Long-term archiving on: : Wednesday, December 13, 2017 - 6:35:01 PM

File

Acepted Manuscript Hybrid coat...
Files produced by the author(s)

Identifiers

Citation

Laura C. Córdoba, Andreia Marques, Maryna Taryba, Thibaud Coradin, Fatima Montemor. Hybrid coatings with collagen and chitosan for improved bioactivity of Mg alloys. Surface and Coatings Technology, Elsevier, 2017, 20, pp.243 - 247. ⟨10.1016/j.surfcoat.2017.08.062⟩. ⟨hal-01585205⟩

Share

Metrics

Record views

486

Files downloads

378