A kind of wear-resistant diamond-like carbon (DLC) films doped with Ni, N, and multiwalled carbon nanotubes (MWCNTs) are synthesized on Ti-6Al-4V titanium alloy by a combined method of pulsed electrodeposition and liquid-phase electrodeposition. The effect of different concentrations of MWCNTs on the microstructure and friction mechanism of Co-DLC films is investigated. The results show that the polydimethyl diallyl ammonium chloride (PDDA)-MWCNTs complex tend to deposit parallel to the substrate. Benefiting from the "bridging" effect of the MWCNTs between the cluster structures, it effectively reduces the protrusions on the surface of the films. When the concentration of MWCNTs is 0.06 g L À1 , the surface microstructure of the films is uniform and dense, and the films present a low I D /I G value (0.57) and a high sp 3 -C content. The Raman and X-ray photoelectron spectroscopy patterns reveal that the Ni/N/MWCNTs-DLC films are typical amorphous carbon films. Furthermore, the micro-indentation hardness of the Co-DLC films reaches 513.24 HV. The lubricated Ni/N/MWCNTs-DLC films significantly improve the frictional wear properties of the titanium alloy surface, which is mainly attributed to the homogeneous and dense structure and the low friction coefficient (0.146) and wear loss (1.40 Â 10 À5 kg m À1 ).
Diamond-like carbon (DLC) films containing single copper (Cu), nickel (Ni) and double Ni/Cu interlayers were fabricated on LY-12 aluminum alloy by electrodeposition. The influences of different interlayers on the microstructure, microhardness, friction and wear properties and electrochemical behavior of the films were investigated respectively. The morphologies results show that the porosity of DLC films was reduced and the particles were refined after the introduction of double interlayer. Raman and XPS results confirm that the amorphous characteristics of DLC films containing nickel and copper interlayers were enhanced, and the content of sp3-C in the films was increased. In addition, the optimal micro-hardness of 210.67 HV was achieved due to the high sp3-C content of double Ni/Cu-DLC film. Meanwhile, the Ni/Cu-DLC film possessed excellent wear resistance which benefits from the synergistic effect of copper and nickel interlayer. The nickel as the supporting layer and copper as the lubricating layer alleviated the wear and friction of the film. Simultaneously, the deposition of double interlayer increased the density of the film, which further prevented the invasion of corrosion ions,so the film had superior electrochemical properties.
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