Abstract
Magnesium-based biomaterials have been proposed as potential candidates for biodegradable implant materials, such as bone screws, bone plates, intraluminal stents and so on. However, the poor corrosion resistance inhibits their applications in surgery. They collapse before the injured tissues are healed. In this paper, Mg(OH) 2 nonstructural film was synthesized on the substrate of AZ31 magnesium alloy by hydrothermal method with NaOH solution as mineralizer to reduce the corrosion rate of magnesium-based materials. The obtained films were characterized by XRD, SEM, and XPS. The results showed that a Mg(OH) 2 film with nanostructure surface can be synthesized by hydrothermal method. It was observed that the thickness of film increased with the holding time. Corrosion rates of the films were studied by immersing the samples in Hanks solution (37 °C). Surface deposits of samples with films soaked in Hanks solution for 31 days were investigated by XRD, SEM, EDS, XPS, and FTIR. It verified that the corrosion rate of the magnesium alloy with grown film was slowed down in the Hanks solution and the behavior of corrosion was inhibited effectively. Amorphous calcium apatite precursor was observed to deposit on the surface of the film during corrosion experiments in Hanks solution. And the tape test revealed a strong adhesion between the film and the substrate.
| Original language | English |
|---|---|
| Pages (from-to) | 6129-6137 |
| Number of pages | 9 |
| Journal | Applied Surface Science |
| Volume | 257 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 1 May 2011 |
| Externally published | Yes |
Keywords
- Biomaterial
- Corrosion
- Hydrothermal
- Magnesium alloy
- Magnesium hydroxide