Treatments for Enhancing Calcium and Phosphorus on Titanium Oxide Formed by Micro-arc Oxidation

摘要

Anodic oxidation of titanium in the solution containing calcium (Ca) and phosphorus (P) compounds can prepare a Ca- and P-containing oxide film. However, during the galvanostatic anodizing process, both the porous inner layer formed prior to sparks and the crater-containing overlay formed with sparks resulted in decreasing the adhesion of the anodic film. Higher anodizing voltage can enhance the contents of Ca and P in the anodic film, yet leads to the adhesion decrease problem. Simulated body fluid (SBF) immersion after anodic oxidation in this study was reported to be able to increase the contents of Ca and P in the anodic film, and alkali- and heat-treatment (AHT) before SBF immersion further accelerated the reactions in SBF. Both the chemical and physical properties of the layer on the titanium specimen were optimized via these treatments above.