| 초록 |
Titanium and its alloy have over 30 years history for the hard tissue replacement of dentistry and orthopedics. However, titanium surface typically has no bio-function that leads to low bio-compatible attraction of metal surface to bone tissue. One of the most effective surface modification method, anodization is relatively promising surface modification method that can increase wear and corrosion resistance, as well as provide biocompatibility with thick titanium dioxide layer and extended surface area. The conventional anodization method which has a name of micro-arc oxidation (MAO) is normally conducted in acid base electrolyte, and can make an easily micro porous titanium dioxide structure with cheap manufacturing price. By the way, MAO in acid electrolyte method has disadvantage the surface contained residual acid substance can effect failure (unsafe) reason of implantation for dental and orthopedic implant. To minimize hazard of anodization, alkaline based anodization is a potential alternative method can be high mechanical property and corrosion resistance without any concerning of acid toxicity on the human tissue. In this study, we have produced gray color of anodization surface with alkaline electrolyte which has satisfied on the AMS 2488D standard, the material characteristics were analyzed with scanning electron microscopy (SEM), 3 point bending, surface hardness, and corrosion (potentiodynamic) test. As based on the preliminary results, anodized surface has homogenized titanium dioxide layer with gray color and over 1 um thickness, the mechanical and anti-corrosion properties were higher value than that of un-treated surface. |
