The structure and internal stress was investigated for d.c. – plated Ni composites deposits prepared from low - concentrated electrolyte Wattsa, without or with additive agents and dispersed particles: B. The weight percentage of the dispersed phase in the coatings was determined gravimetrically. Diffractometer Siemens D500 with Si[Li] radiation was used to examine the texture and grain – size determination. Internal stresses of deposited coatings Ni-B have been measured with dilatometric method using IS-metru of OMI International Company. The microhardness of the obtained coatings was measured by the Vickers method using a Hanneman microhardness tester at a load of 0.01 kG. The roughness of the obtained nickel layers was measured by a TR 100 profilograph (surface analyzer) from Elcometr Instruments Ltd.

Dispersion particles and additives used in the bath were shown to affect the composition and structure of the electrodeposited composite layer. An increase in the content of B particles in the coating and in the size of nickel [111] crystallites led to increased roughness of Ni-B coatings. The microhardness of the deposited Ni-B layers increased as the size of nickel [111] crystallites decreased. The internal stress of the deposited composite coatings depended to a large degree on the additive in the bath.

Ni-B coatings had a (100) texture, with texture (111) and (311) also frequently occurring. Orientation (100) developed even more strongly than in coatings deposited without additives. This shows that in the presence of 3-(1- pyridinio) – propanesulfonate inner salt (PPS), the development of orientation (110), (111) and (311) is blocked. When the additives were used together, the dimensions of the nickel [111] crystallites in all coatings decreased to the smallest size in any of the studied coatings.

The results suggest that the effect used of the organic compounds was the development of the nanostructure of the nickel matrix.

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