A crack-free anti-corrosive coating strategy for magnesium implants under deformation

•A patterned surface of magnesium (Mg) was used as a selective coating platform for hybrid coating with hard ceramics and flexible polymers.•Local strain gradients along with patterns allowed materials to be matched with regions of patterned surface depending on deformability.•The patterned Mg regio...

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Bibliographic Details
Published in:Corrosion science 2018-03, Vol.132, p.116-124
Main Authors: Cheon, Kwang-Hee, Gao, Chao, Kang, Min-Ho, Jung, Hyun-Do, Jang, Tae-Sik, Kim, Hyoun-Ee, Li, Yaning, Song, Juha
Format: Article
Language:English
Subjects:
Biomaterials
Biomedical materials
Ceramic coatings
Ceramic glazes
Corrosion prevention
Corrosion resistance
Deformation
Hard coating
Magnesium
Medical electronics
Metal surfaces
Protective coatings
Surgical implants
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Summary:•A patterned surface of magnesium (Mg) was used as a selective coating platform for hybrid coating with hard ceramics and flexible polymers.•Local strain gradients along with patterns allowed materials to be matched with regions of patterned surface depending on deformability.•The patterned Mg regions of small and large deformations were successfully coated with hydroxyapatite (HA) and polyetherimide (PEI).•Under deformation, PEI/HA selective coating protected Mg from surface defects and from the corrosive effects of physiological environments. Surface patterns can be used as a selective coating platform on metal surfaces, in particular, under various deformation conditions because they induce local strain gradients along with pattern geometry. In this study, hard and flexible coating materials were introduced to regions with small and large deformations, respectively, on patterned magnesium (Mg) surfaces. Despite significant deformation, a polymer-ceramic coating on patterned Mg maintained its protection, as opposed to a ceramic coating on a flat Mg surface. Our proposed approach can be implemented in various Mg-based medical-device platforms by optimizing surface patterns on Mg depending on their loading conditions for clinical use.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2017.12.030