Ni - P/PTFE （ Nano - particle） and Ni - PTFE （ Micro - particle） composite plating was prepared by electroless plating on Q235 carbon steel substrate. The effects of particle size and volume content on anti - friction were investigated on a ball - on - disc tribo - tester. The load carrying capacity of coating with the lowest frictional coefficient was also included. The experiment result shows the lowest friction coefficient （0. 11 -0. 15 ） was obtained for Ni - P composite plating at 26 vol. % PTFE particles both in nano - or micro - particles. The wear loss and friction coefficient of Ni - P/PTFE （N） composite coating were close to that of Ni - P/PTFE （M） composite coating at low load. However, the load bearing capacity of Ni - P/PTFE （N） composite coating were 3.5 times as high as that of Ni - PTFE （M） composite coating
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