Corrosion resistance and antibacterial properties of Ti-3Cu alloy prepared by selective laser melting
(1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. The Third Xiangya Hospital, Central South University, Changsha 410013, China;
3. Department of Prosthodontics, Centre of Stomatology, Xiangya Hospital, Central South University, Changsha 410008, China;
4. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;
5. Light Alloy Research Institute, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)
2. The Third Xiangya Hospital, Central South University, Changsha 410013, China;
3. Department of Prosthodontics, Centre of Stomatology, Xiangya Hospital, Central South University, Changsha 410008, China;
4. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;
5. Light Alloy Research Institute, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)
Abstract: The corrosion resistance and antibacterial properties of Ti-3Cu alloy prepared by selective laser melting were evaluated using electrochemical experiments and a variety of antibacterial characterization. It is found that the charge transfer resistance of Ti-3Cu alloy was 4.89×105 Ω？cm2, which was doubled the data obtained by CP-Ti alloy. The antibacterial rates of Ti-3Cu alloy against S. mutans and P. gingivalis were 45.0% and 54.5%. And the antibacterial rates increased with the prolongation of cultivation time, reaching up to 62.8% and 68.6%, respectively. The in-situ nano Ti2Cu precipitates were homogeneously distributed in the matrix of the Ti-3Cu alloy, which was the key reason of increasing the corrosion resistance. Additionally, the microscale electric fields between the α-Ti matrix and the Ti2Cu was responsible for the enhancement of the antibacterial properties.
Key words: selective laser melting; Ti-3Cu alloy; microstructure; corrosion resistance; antibacterial properties