Studying the effect of cobalt percentage on the corrosion rate of sintered titanium dental implants

Titanium and its alloys are getting great attention in both medical and dental fields because of; excellent biocompatibility; light weight; excellent balance of mechanical properties; excellent corrosion resistance. The goal of this work is to study how the Co addition to Ti influences on the corrosion behavior of dental alloys. The Preparation of samples was accomplished by using powder technology technique. In which the raw materials used was pure titanium powder and pure cobalt powder. Characterization of sample includes (X-ray diffraction patterns, microstructure observations (scanning electron and optical microscopic), porosity percentage and corrosion test. Sample without cobalt addition was refer to an alloy with single a phase, while After the additions of cobalt in different percentage (5%, 10%,15%) α-Ti and intermetallic compound Ti2Co was observed from XRD and microstructure observations, the amount of Ti2Co phase slightly increase with increasing cobalt content. The porosity percentage decreases with increase in cobalt percentage. The corrosion rate decreases with increase in Co percentage.