Preparation and Property of Coatings Carrying Extract of Rhizoma Drynariae on the Surface of Pure Titanium

To improve the bioactivity of surface of titanium and reduce infection rate of implantation, porous coatings were prepared by ultrasonic micro arc oxidation (UMAO) and phytic-acid-coupled extract of rhizoma drynariae (ERD) was loaded in the coatings. Besides, the structure, surface morphology and performance of the coatings were investigated. The results indicate that nano particles of drug loading increase in number with the increasing of ERD concentration. The surface of the coatings produce PO43-, P2O74- and O=P-O-. The friction coefficient of the coating carrying ERD with concentration of 12.5 g/L is lower. Also, this coating is hydrophilic. The potential increases by 0.33 similar to 0.45 V and self -corrosion current decreases by an order of magnitude for the coatings carrying ERD. The coatings produce HA after soaking in SBF for 7 d. In conclusion, the corrosion resistance, binding force and bioactivity are improved by drug loading coupled with phytic acid after MAO on the pure titanium.