In Vivo and In Vitro Study of a Multifunctional SF/nHAp Corrosion-Resistant Bio-Coating Prepared on MAO Magnesium Alloy via Ultrasonic Spraying.

Magnesium alloys are often used in bone repair surgeries due to their biodegradability and excellent elastic modulus, making them a promising alternative to traditional nondegradable implants like titanium alloys. However, their rapid degradation rate limits their use as implants in the body. To enhance the corrosion resistance and bioactivity of magnesium alloys, we applied an ultrasonic spray coating on microarc oxidized (MAO) AZ31 magnesium alloy, using a mixture of silk fibroin (SF) and nanohydroxyapatite (nHAp).

Fluoride Coatings on Magnesium Alloy Implants.

After several years of research and development, it has been reported that magnesium alloys can be used as degradable metals in some medical device applications. Over the years, fluoride coatings have received increasing research attention for improving the corrosion resistance of magnesium. In this paper, different methods for preparing fluoride coatings and the characteristics of these coatings are reported for the first time.

Corrosion Evaluation of Pure Mg Coated by Fluorination in 0.1 M Fluoride Electrolyte.

In the ongoing research on the application of biodegradable materials, surface treatment of is considered to be a relatively effective solution to the excessive degradation rates of Mg alloys. In this study, to further optimize the proven effective surface coatings of fluoride, a low-voltage preparation fluorination method was used to achieve coating effectiveness under safer conditions. Optical observation, scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and potential dynamic polarization (PDP) experiments were used for the analysis and evaluation.

Corrosion Behavior of Biodegradable Magnesium Alloy by MAF Treatment.

Coating treatment plays an irreplaceable role in propelling the clinical application of magnesium alloys. This experiment was designed in order to observe the anticorrosion behavior of magnesium fluoride coating in rats. The MgF layer was prepared on the surface of AZ31 magnesium alloy in saturated NHHF solution by microarc fluorination (MAF) at 190 V.