Open AccessPreparation of poly(ε‐caprolactone)‐hydroxyapatite composite coating for improvement of corrosion performance of biodegradable magnesium
Author(s) -
BakhsheshiRad Hamid Reza,
Hamzah Esah,
Shuang Choa Pei,
Berto Filippo
Publication year - 2020
Publication title -
material design & processing communications
Language(s) - English
Resource type - Journals
ISSN - 2577-6576
DOI - 10.1002/mdp2.170
Subject(s) - materials science , corrosion , coating , agglomerate , magnesium , composite number , caprolactone , composite material , substrate (aquarium) , electrochemistry , chemical engineering , metallurgy , polymer , chemistry , copolymer , oceanography , electrode , engineering , geology
Magnesium (Mg) and its alloys are employed extensively in biomedical implant applications because of its low density and suitable cytocompatibility. But low corrosion resistance of Mg limits its biomedical application, and thus, creating a surface barrier by coating has been highly recommended by other researchers. This paper describes the degradation behavior of poly(ε‐caprolactone)/hydroxyapatite (PCL/xHAp; x = 0, 5, 10, and 15 wt%)‐coated magnesium fabricated by dip‐coating process. The experimental results exhibited the neat PCL and composite PCL with low HA concentration, where the film was smooth and uniform with a thickness of 50 to 52 μm, while PCL containing high HAp concentration presented rough surface owing to HAp formed agglomerate particles with similar coating thickness, implying that the addition of HAp has hardly any effect on the coating thickness. The electrochemical measurements revealed that the corrosion resistance of PCL/HAp film increased substantially (8720 Ω cm 2 ) than uncoated sample (1562 Ω cm 2 ). However, PCL coating with high HAp shows lower corrosion resistance compared to the neat PCL and PCL/HAp composite film with low HAp content because the agglomerate particles in coating with high HAp did not form uniform and continuous film that can inhibit the substrate from degradation.