The aim of the present paper is to report results of performed investigations on the influence of additions of different quantities of ionic liquids into Watts bath on properties of nanocrystalline Ni layers prepared by the electrodeposition method. The nanocrystalline nickel layers were electrodeposited in Watts bath with saccharine and different ionic liquids additions. The results of analyses of the topography and morphology and hardness properties of nanocrystalline Ni layers prepared with and without liquid ions additives are also presented. The structural analyses are performed by using the X-Ray diffractometer PW -1830. The morphology and topography of produced layers were performed by scanning electron microscopy S-3600N and transmission electron microscopy JOEL 1200. Results of performed investigations have showed that the introduction of ionic liquids into the bath leads to important improvements of mechanical properties of the nanocrystalline Ni surface layers produced by the method of electrocrystalizations

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