UDC 621.162 © Benigna Szeptycka, Jan Senatorski TRIBOCORROSION EVALUATION OF NI-PTFE ELECTROCHEMICAL COATINGS This paper presents the results of tribological and tribocorrosion tests of electroplated nanocomposite Ni-PTFE coatings deposited on a steel surface. <...> The microhardness of the deposited layers was measured with theVickers hardness test with a 0.0981 N load. <...> An Amsler A-135 testing device was used to measure sliding wear. <...> Testing conditions were as follows: friction system: block – ring; friction pair: composite coating sample on the S235JR steel – 41Cr4 steel counter sample; rotational speed of counter sample: n=200 rpm., friction speed: V = 0.35 m/s; load: 25daN; test duration: t = 5 h; diameter of counter sample ring – 35 [mm]. <...> Conditions for friction pair interaction – lubrication with Lux oil (SAE30), 2 parts of Lux oil:1 part 0,5 M NaCl and 2 parts of Lux oil:1 part 0.28 M H2SO4 . <...> The wear resistance of the tribological system friction pair: composite coating Ni-PTFE sample – 41Cr4 steel counter sample is proportional to the microhardness of the composite coatings. <...> The 160 Проблемы машиностроения и автоматизации, № 1 – 2012 dispersive particles used in the study were polytetrafluoroethylene PTFE ~100 nm (DT 50% dispersion) from ZA Tarnw. <...> The structural parameters of Ni crystallites were determined by analyzing 111 and 222 reflexes (halfintensity width and position), which broadening is derived from the size crystallites and microstrain (fluctuation of the lattice constants) and may be described by a Cauchy-type curve. <...> In order to test the tribological properties of the composite coatings, the adopted method complied with the LB-4 Nr PB/2-19/LB-4 procedure. <...> This method is used to measure sliding wear in a rotational movement. <...> Testing conditions on the Amsler A-135 equipment were as follows: friction system: block – ring; friction pair: sample the composite coating on the S235JR steel– counter sample 41Cr4 steel heat treated (ca.70 HRC); rotational speed of counter sample: n=200 rpm., friction speed: V = 0.35 m/s; load: 25 daN; test duration: t = 5 h <...>