Microwave assisted hydroxyapatite deposition coating on AZ31 magnesium alloy

Abstract

The long presence of metal implants such as titanium alloys in physiological environment will cause an expanded danger of local inflammation and the release of toxic metal ions into human body. So recently, absorbable biocompatible materials attract more attentions. Biodegradable Magnesium alloys due to their excellent load - bearing properties and good biocompatibility became promising candidates to replace common metallic in temporary implants . However, because of unacceptably high degradation rate of Mg in a high chloride environment of the physiological systems a controllable absorbable rate is needed. One of the simplest ways to enhance the corrosion resistance of magnesium alloys is to apply a protective coating on the substrate by using a variety of methods . In this manner, late studies have concentrated on bioactive ceramic coatings, such as calcium phosphate coatings, which displayed great corrosion resistance and exceptional biocompatibility and bioactivity. It was proven that the microwave assisted coating can provide significant improvement in the corrosion resistance of magnesium alloy substrate. Also the irradiation time was important by its effect on crystallization and coating thickness.