The Effect of Electrodeposition Combined with Surface Texturing on the Tribology Performance of Cylinder Liner

A Ni-Cr thick film doping with nano-MoS2 particles doping was electrodeposited on the textured surface of the ductile iron cylinder liner to enhance the tribology performance of piston ring-cylinder liner(PR-CL) friction pair. The circular texture was prepared on the cylinder liner surface, which is characterized with the depth of 50 μm, the diameter of 350 μm, and the 10 % area density. The dop-ing concentration of nano-MoS2 particles was 1-5 g/L and the current density for electrodeposition was 2-6 A/dm2. The morphologies and element distribution of electro-deposition films in the mi-cro-dimples indicated that the Ni-Cr-MoS2 composite film were successfully deposited into the inte-rior of the micro-texture and the micro-texture still maintains the original morphological characteris-tics. A reciprocating friction test was carried out to evaluate the effect of Ni-Cr-MoS2 composite film (TNMF) combined with surface texture on the tribology properties of cylinder liner. The lubricating oil is 4652D. The coefficient of friction (COF) of the TNMF cylinder liner reduced from 0.143 to 0.127 and the wear loss decreased from 7.6 mg to 6.9 mg, compared with the uncoated cast iron (UC) cylinder liner. The scuffing time of TNMF cylinder liner extended from 19 min to 65 min. The syn-ergistic effects with the solid lubricant release from composite film, and lubricant reservation and debris capture of the micro-texture play the dominant role for the enhancement in tribology proper-ties of PR-CL friction pair.