Abstract
Ni-W coatings were evaluated considering the effect of ultrasound-assisted deposition and the electrolytic bath's temperature on the faradaic efficiency. Electrodeposition occurred with and without thermosonication (TS) at 40, 50, and 60 °C. Both process variables were significant (p-value<0.05). The temperature profile indicated that the nominal power of the system was 10.8 ± 0.3 W. The W content increased with the increase of the temperature and the use of ultrasound. Microcracks decreased due to an increase in the diffusion process generated by acoustic cavitation. The alloys presented nanocrystalline structures of Ni17W3 composition, with preferential orientation in the plane (220). The peaks slightly decreased with the increase of the temperature and under TS, indicating a tendency to amorphization. The coating produced at 50 °C without TS exhibited the highest polarization resistance value of 20.50 kΩ cm2. The electrochemical impedance spectra confirmed the Ni-W alloy's anticorrosion property with an equivalent circuit mainly composed of a non-ideal capacitor and a Warburg element.
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