studying the effect of the concentration of ptfe nanoparticles on the tribological behavior of ni-p-ptfe composite coatings

in the past 30 years, electroless nickel (en) plating has grown to such proportions that these coatingsand their applications are now found underground, in outer space, and in a myriad of areas inbetween. moreover, in order to further improve the mechanical and tribological properties of thenickel-phosphorous (ni-p) coatings, ni-p/ptfe composite coatings can be obtained, which provideseven greater friction behavior and lubricity than the one naturally occurring in the nickel-phosphorousalloy deposit. in this paper, the ni-p-ptfe coating was deposited on mild carbon steel surface viaelectroless deposition process. the friction behavior and wear mechanisms of ni-p-ptfenanocomposite coating were studied at different concentrations of ptfe. frictional behavior wasexamined using a pin on disk wear test method. surface morphology and worn surface was evaluatedusing field emission scanning electron microscopy (fesem) and energy dispersive spectroscopy(eds) analysis. the results showed that the incorporation of ptfe nanoparticles can reduce the wearrate of ni-p coating from 33.07×10-6 mm3/nm to 12.46×10-6 mm3/nm for the ni-p ptfe containing10 g/l ptfe and decrease the friction coefficient from 0.64 to 0.2. thus the tribological behavior ofni-p coating is much improved in the presence of ptfe nanoparticles and 10 g/l is the optimizedconcentration of ptfe in the electroless bath.