Study On The Preparation And Corrosion Resistance Of Ti-Cu-N Nanocomposite Films

In this paper, Ti-Cu-N nanocomposite coatings are co-deposited on 316 L stainless steel substrates by arc ion plating and magnetron sputtering composite coating method. Research the role of film microstructure law by adjusting Cu target current and controlling N₂ flow. The content of Cu effecting the corrosion resistance and antibacterial thin of the film also is investigated. The Ti-Cu-N films was investigated using X-ray diffractometer（XRD） and scanning electron microscope（SEM）. The corrosion resistance was evaluated using the traditional three electrode method for no coating and the coating samples with dynmic-potential polarization tests. We study the antibacterial properties of films by testing staphylococcus epidermidis.The results show that Ti-Cu-N nanocomposite thin film surface is more uniform refine of N₂ increases from 40 sccm to 120 sccm. The result shows that as the current of Cu target increases from 0.15 A to 0.9A, the content of Cu in the membrane increases from 0.76 at % to 33.5 at %; Ti- Cu- N nanocomposite films are mainly in the form of Cu and Ti N mixed phase, diffraction peaks of TiN（311） and Cu（111）、（200） appear in the XRD patterns; Along with the increase of the content of Cu, diffraction peak intensity of Cu（111）、（200） increases, Ti-Cu-N nanocomposite thin film surface is more uniform refine, corrosion potential of Ti-Cu- N nanocomposite films become higher, indicating that as the content of Cu in the Ti-Cu-N nanocomposite thin film increases, corrosion resistance of Ti-Cu-N thin film enhances. The experiments using staphylococci（S.aureus） as the test species, bactericidal effect on Ti-Cu-N films and TiN films with different times shows that Ti-Cu-N film sterilization rate is higher than TiN film sterilization rate. As the current are 0.15 A, 0.3A, 0.5A, 0.9A increasing, and the sterilization rate of the films increases to 97.87% to 99.20% after 24 h.