Three kinds of diamond-like carbon-based films of a-C, a-C:H and a-C:Cr were deposited by unbalanced magnetron sputtering technique on 316L steel and Ni60C spray-welding coating, respectively. Tribocorrosion resistance in 5 wt% sulfuric acid solution of two different protective systems were investigated. The result indicate that the carbon-based films deposited on Ni60C spray-welding coating show a significant improved adhesion and wear resistance compared with the one deposited on 316L. The friction coefficient and corrosion wear rate of the DLC films deposited on Ni60C spray-welding coatings were 0.05 ~ 0.14 and 0.66×10-8 ~ 5.7×10-8 mm3/N?m, respectively. The improvement of abrasion resistance of composite system was attributed to the Ni60C spray-welding coating as a hard support layer which can improve the bearing capacity of the DLC films, the graphitization process of DLC films in the process of tribocorrosion test was effectively inhibited.