Corrosion Resistance and Bacteriostatic Properties of DCPD-PMTMS-CS Coating on Additive Manufacturing Preparation of...

The nickel-titanium (NiTi) alloy implant materials produced by using the laser powder bed melting (LPBF) technique exhibit significant potential for application. The coating modification method can further enhance the surface biological functions of the alloy implants. This study presents a coating of calcium dihydrogen phosphate, siloxane, and chitosan (DCPD-PMTMS-CS) applied to the surface of NiTi alloys through electrochemical deposition and dip coating methods. This coating enhances the biocompatibility, corrosion resistance, and antibacterial properties of the alloy's surface. The findings indicate that the corrosion current density decreases (from 1.5 × 10^-6 to 1.2 × 10^-8 A/cm²), demonstrating a significant improvement compared to bare NiTi alloy. Furthermore, the cell vitality reached an impressive 108%. Additionally, the antibacterial efficacy against E. coli and S. aureus exceeded 70%, effectively mitigating the risk of postoperative infections. The DCPD-PMTMS-CS composite coating holds promise for facilitating the broader application of LPBF-NiTi in the medical implantation sector.