Production and structure of electrocoatings Ni-P-TiO2-Al

Composite Ni-P-TiO2 and Ni-P-TiO2-Al layers were prepared by simultaneous electrodeposition of nickel and titanium dioxide (anatase) with an addition of Al. powder on a copper substrate from a solution in which TiO2 and Al powder were suspensed by stirring. The electrodeposition was carried out under galvanostatic conditions at a current density j = 300 mA cm(-2) and temperature of 298 K. The phase composition of the layers was investigated by the X-ray diffraction method. It was found that during the electrodeposition process a spherical crystalline particle of TiO2 could be incorporated into the Ni-P phase matrix. The diffractogram of Ni-P-TiO2-Al layer shows that the layer contains crystallites of aluminium and TiO2. It means that transport of the metallic phase to the electrode is only possible when using TiO2 as its carrier. This allows to extract of aluminium in alkaline environment from the Ni-P-TiO2-Al layer and to obtain the active surface.