Properties of Cu-Cr-Alloyed Layer on Titanium Alloy Surface

The duplex treatment of plasma surface alloying with copper followed by thermal diffusion under the bombardment of glow was carried out on Ti-6Al-4V. The antibacterial properties against Gram-negative E.coli ATCC10536 and Gram-positive S. aureus ATCC25923 of the untreated and duplex-treated alloy were investigated by a spread plate method. In addition, the wear resistance was also tested. X-day diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were employed to analyze the phase structure and the elementary composition of the coatings, and the optical microscopy with 3D function was used to detect the wear depth. The results show that the copper concentration of the alloyed surface is about 11 wt%, the chromium concentration is 13%, and the thickness of alloyed layer is about 12 gm. The alloyed surface exhibits excellent antibacterial properties against both E.coli and S.aureus. Meanwhile, the wear resistance is improved significantly.