3.3. Microstructure of typical layer after different surface preparation
The microstructural analysis showed correct structure and quality of the obtained galvanic coatings in all the tested cases (Fig. 3). However, in the case of the layer deposited on the polished surface, number of cracks and casting defects can be noticed (Fig. 3a). It is result of the mechanical jamming of the chemical nickel layer to the substrate and adhesion improvement. Such results were not noticed in other cases (Fig.3b and c).