Abstract
The Zn-Ni layers were obtained by electrolytic method in the conditions of pulse current with symmetric current pause. The austenitic steel (OH18N9) was used as the cathode. The morphology, phase and surface chemical composition of the layers deposited at reduction current densities ic = 5 – 25 mAcm2, were defined. The surface morphology of deposited layers and surface chemical elements distribution were studied using a scanning electron microscope (JEOL JSM-6480). On the basis on this research, the possibility of deposition of Zn-Ni layers contained about 8 – 10 % at. Ni was exhibited. The optimal pulse current condition of Zn-Ni layers deposition were proposed namely ic=20mA•cm2, ton = toff = 2ms. It was stated, that surface chemical composition of Zn-Ni layers is independent on pulse current densities of deposition, whereas development of Zn-Ni surface increases with the increase in the pulse current density of deposition. The corrosion resistance investigations showed that passivation and heat treatment improved the corrosion resistance of Zn-Ni layers in 5% NaCl solution. Higher corrosion resistance of heated Zn-Ni layers is caused by the creation of Ni5Zn21 intermetallic phase. Moreover the heated Zn-Ni layers are characterized by slightly higher corrosion resistance compared with metallic Cd. Microhardness of the layers was investigated by Vickers diamond testing machine.
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