Composite layers with Ni-P matrix and carbon nanotubes (CNTs) disperse phase have been the subject of the present authors’ investigations performed recently. The composite layers were deposited on carbon steel St3Ssubstrate by chemical method.

The investigations reported in the present paper are focused on Ni-P composite layers modified by carbon nanotubes.  Due to the incorporation of CNTs into Ni-P matrix it is possible to improve mechanical and tribological properties of produced materials. The Ni-P layers as well as Ni-P-CNTs composite layers have been prepared successfully by chemical method. The plating bath used in performed processes contained following components: NiSO₄, NaH₂PO₂, CH₃COONa, C₃H₆O₃ and pH value of the bath was maintained at 4.5. The Ni-P layers were produced and also examined for the sake of comparison purposes with composite layers.

            Morphology and topography Ni-P layers and Ni-P/CNTs composite layers were investigated by scanning electron microscopy (SEM) S-3500N. The structure of CNTs was analyzed by transmission electron microscopy (TEM) JEOL-1200 ans by analytical scanning electron microscope SU-70. The layers microhardness was determined by applying the Vickers hardness indenter, using a load of 20 G.

Results of performed investigations have showed that the introduction of CNTs into the bath leads to important improvements of mechanical properties of Ni-P/CNTs surface layers.

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