This paper presents the resultswork on the electrochemical deposition ofNi(3)Se(2) phase from aqueous acidic solutions. The mechanism of electrode reactions in the Ni2+ -H2SeO3-H(2)Osystem was investigated with the use of cyclic voltametry and a gold disk electrode. According to the voltametric and hydrodynamic methods, the process of nickel and selenium co-deposition is determined by the rate of selenium ions diffusion to the electrode surface. Ni3Se2 coatings were also obtained by the potentiostatic method on copper substrate. The elemental composition was determined with the XRF method. XRD analysis indicated that, in the range of potentials from -0.6 to -1.0 V the dominating phase is Ni3Se2. The influence of applied potential and concentration of electroactive species on the composition and the quality of the obtained coatings was determined. The Surface morphology was investigated with the use of scanning electron microscopy. (C) 2017 The Electrochemical Society. All rights reserved.