Abstract
In this study, a nanostructured needle-like hydroxyapatite (HA) coating was prepared by the sodium citrate template-assisted hydrothermal method on magnesium alloy (AZ31). The influence of sodium citrate on the composition, microstructure and corrosion behavior of the coatings was studied. The results showed that with the increase in the mole ratio of Ca/sodium citrate from 1 to 13, the coating gradually changed from the needle-like morphology of HA to the flake morphology of β-tricalcium phosphate (β-TCP), which was related to the existing form of citrate in the solution and the trend of complexation reaction. When the mole ratio of Ca/sodium citrate was 1, the HA coating sample with the nano needle-like morphology had a high corrosion resistance (Rt = 235.300 ± 3.584 kΩ·cm2), which was almost 200 times that of the naked AZ31 alloy. Moreover, the corrosion rates of the Ca-P coated AZ31 alloy stabilized at about 0.55 mm/year and could provide more than 56 days of corrosion protection to the samples, which approximated the degradation rate requirement for biomaterials used as bone fixture.
Highlights
Magnesium alloys have been receiving extensive attention and research-focus in the biomaterial field due to their excellent mechanical compatibility, biodegradability and biocompatibility
While we prepared coated samples by the sodium citrate template-assisted hydrothermal method, we found that the content of sodium citrate in the hydrothermal solution may influence the nucleation and growth of the Ca-P crystal, and this
All five coated samples consisted of magnesium (Mg, JCPDS # 65-3365), magnesium hydroxide (Mg(OH) 2, JCPDS # 76-0667), consisted of magnesium (Mg, JCPDS # 65-3365), magnesium hydroxide (Mg(OH)2, JCPDS # 76-0667), β-tricalcium phosphate (β-TCP) (JCPDS # 70-2065) and HA (JCPDS # 74-0565)
Summary
Magnesium alloys have been receiving extensive attention and research-focus in the biomaterial field due to their excellent mechanical compatibility, biodegradability and biocompatibility. Magnesium alloys are promising biomedical metallic materials in the field of orthopedics [1,2]. Their rapid corrosion in the humoral environment can lead to a series of adverse effects [3,4], including the rapid deterioration failure of mechanical properties, local alkalization and severe hydrogen evolution reaction, which limits their clinical application [5]. Recent studies have shown that surface modifications by coatings prepared on magnesium alloys can improve corrosion resistance in the humoral environment effectively. Wang et al [24] hydrothermally prepared MgAl hydrotalcite
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