Abstract: The Al electrode substrates were covered with TiB2 by plasma spraying to form a series of composite electrodes va-ried in spraying power, whose interface microstructures and phase structures were characterized by XRD and SEM. Under the same powder-feeding potential and spraying distance, the effect of spraying power on composite electrode′s electrochemical performance was analyzed. The results showed that the phase compositions of the electrodes′ surface coatings prepared by plasma spraying were TiB2. The sprayed TiB2 can evenly and densely coat on surface of Al substrate, but no interface reaction with Al occurred and binding mode is mechanical binding. When spraying power, powder-feeding potential, and spraying distance were 34 kW, 12 V and 10 cm, respectively, the sprayed electrode had the best corrosion resistance, as its interfacial resistivity 1.22×10-6 Ω·cm was the lowest (66% lower than that of Ti/Al electrode), and had a corrosion current density of 1.47×10-4 A/cm2 (81% lower than that of Ti/Al electrode) and a corrosion voltage of -0.579 V (35% higher than that of Ti/Al electrode).
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2017, Vol. 31 
