Bioactivity Behavior Evaluation of PCL-Chitosan-Nanobaghdadite Coating on AZ91 Magnesium Alloy in Simulated Body Fluid

Farzad Soleymani,Fariborz Tavangarian,Rahmatollah Emadi,Sorour Sadeghzade

doi:10.3390/coatings10030231

Farzad Soleymani, Fariborz Tavangarian + Show 2 more

Open Access

https://doi.org/10.3390/coatings10030231

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Abstract

Polymer–ceramic composite coatings on magnesium-based alloys have attracted lots of attention in recent years, to control the speed of degradability and to enhance bioactivity and biocompatibility. In this study, to decrease the corrosion rate in a simulated body fluid (SBF) solution for long periods, to control degradability, and to enhance bioactivity, polycaprolactone–chitosan composite coatings with different percentages of baghdadite (0 wt.%, 3 wt.%, and 5 wt.%) were applied to an anodized AZ91 alloy. According to the results of the immersion test of the composite coating containing 3 wt.% baghdadite in a phosphate buffer solution (PBS), the corrosion rate decreased from 0.45 (for the AZ91 sample) to 0.11 mg/cm2·h after seven days of immersion. To evaluate the apatite formation capability of specimens, samples were immersed in an SBF solution. The results showed that the samples were bioactive as apatite layers formed on the surface of specimens. The composite coating containing 3 wt.% baghdadite showed the highest apatite-formation capability, with a controlled release of ions, and the lowest corrosion rate in the SBF.

Highlights

Nowadays, metals have a wide range of applications in orthopedic and dental surgeries; only a few are biocompatible and being used as implants [1,2]
Magnesium and its alloys have been used as temporary implants for biomedical and orthopedic applications due to close mechanical properties to those of bone, the release of magnesium ions inside the bone, and their biodegradability in the simulated body fluid (SBF) medium [4,5]
Peaks resulting from the produced powder were in a perfect agreement baghdadite nanopowder

Summary

Introduction

Metals have a wide range of applications in orthopedic and dental surgeries; only a few are biocompatible and being used as implants [1,2]. The most important metals are stainless steels, cobalt-, nickel-, magnesium-, and titanium-based alloys [3]. Among these metals, magnesium and its alloys have been used as temporary implants for biomedical and orthopedic applications due to close mechanical properties to those of bone, the release of magnesium ions inside the bone, and their biodegradability in the simulated body fluid (SBF) medium [4,5]. The main advantages of magnesium over other metallic biomaterials are its biodegradability and lightweight [8]. It is an essential element for the body’s metabolic activities.

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