Preparation and characterization of a composite coating composed of polycaprolactone (PCL) and amorphous calcium carbonate (ACC) particles for enhancing corrosion resistance of magnesium implants

•Novel composite ACC/PCL coating was fabricated on AZ60 substrate by using dip-coating.•Composite coatings remarkably improved the corrosion resistance of AZ60 alloy than pristine PCL.•ACC/PCL coating helped to form the Mg3(PO4)2 layer with SBF immersion. Magnesium (Mg) and its alloys serve as poten...

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Bibliographic Details
Published in:Progress in organic coatings 2019-11, Vol.136, p.105225, Article 105225
Main Authors: Jia, Siqi, Guo, Yunting, Zai, Wei, Su, Yingchao, Yuan, Shisheng, Yu, Xiaoshuai, Xu, Yingchao, Li, Guangyu
Format: Article
Language:English
Subjects:
Alloys
Amorphous calcium carbonate
Apatite
Biocompatibility
Biodegradability
Biomechanics
Calcium carbonate
Corrosion
Corrosion prevention
Corrosion resistance
Corrosion resistant alloys
Degradation
Dip coatings
Immersion coating
Immersion tests (corrosion)
In vivo methods and tests
Magnesium alloy
Magnesium base alloys
Orthopedics
Polycaprolactone
Precipitates
Protective coatings
Substrates
Surgical implants
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Summary:•Novel composite ACC/PCL coating was fabricated on AZ60 substrate by using dip-coating.•Composite coatings remarkably improved the corrosion resistance of AZ60 alloy than pristine PCL.•ACC/PCL coating helped to form the Mg3(PO4)2 layer with SBF immersion. Magnesium (Mg) and its alloys serve as potential biodegradable implants material because of their excellent biocompatibility and appropriate biomechanical compatibility. However, the high degradation rate in vivo limits the practical applications of magnesium based materials. To improve the corrosion resistance of Mg alloy, a uniform composite coating of polycaprolactone (PCL) and amorphous calcium carbonate (ACC) particles was prepared on AZ60 by dip-coating. Results of electrochemical measurements and immersion tests in SBF solution suggested that the composite coating remarkably improved the corrosion resistance of AZ60 alloy. The increase in corrosion resistance by the composite coating protection can be ascribed to two factors: (i) an initial barrier to delay the ingress of SBF solution, (ii) the gradual dissolution of ACC particles and release of phosphate ions to form a Mg phosphate layer, which protects the Mg substrate. In addition, the microstructure and composition for the composite coating after immersion showed that massive Mg modified ACC and apatite precipitates formed on the surface, which is indicative of its superior biomineralization capability. In summary, this PCL/ACC composite is a promising coating material for tailoring the degradation behavior of magnesium for orthopedic applications.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2019.105225