Abstract
The paper discusses experimental investigations aiming at the determination of appropriate conditions for the chemical deposition of Ni-P-Al₂O₃ composite coatings. The structure, microhardness, and abrasive wear of deposits on steel St3S (0.3 % C) were studied. An electronscanning microscope was used to analyse the structure of the layers. The phase composition of the coatings was determined using a diffractometer. The profile of roughness was analysed with a profilographer. Adhesion was tested as well. The analyses of the properties of the Ni-P-Al₂O₃ deposits confirm that the presence of the dispersion phase of aluminium oxide affects the resistance of the coating to mechanical destruction.

Key words
outer layer, composite coatings, micro-dispersive grain, electroless deposition, wear resistance

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