Electrodeposition of nickel-tungsten alloys under ultrasonic waves: Impact of ultrasound intensity on the anticorrosive properties

Josiel Martins Costa; Ambrósio Florêncio de Almeida Neto

doi:10.1016/j.ultsonch.2021.105495

Electrodeposition of nickel-tungsten alloys under ultrasonic waves: Impact of ultrasound intensity on the anticorrosive properties

Ultrason Sonochem. 2021 May:73:105495. doi: 10.1016/j.ultsonch.2021.105495. Epub 2021 Feb 13.

Authors

Josiel Martins Costa¹, Ambrósio Florêncio de Almeida Neto²

Affiliations

¹ Laboratory of Electrochemical Processes and Anticorrosion, Department of Product and Process Design, University of Campinas, School of Chemical Engineering, Avenida Albert Einstein, 500, Campinas, 13083-852, SP, Brazil. Electronic address: josiel.martins.costa@gmail.com.
² Laboratory of Electrochemical Processes and Anticorrosion, Department of Product and Process Design, University of Campinas, School of Chemical Engineering, Avenida Albert Einstein, 500, Campinas, 13083-852, SP, Brazil.

Abstract

Electrodeposited Ni-W alloy assisted by high-intensity ultrasound was evaluated considering the nominal power effect on the anticorrosive property. Temperature profiles demonstrated that using a nominal power of 400 W, the electrolytic bath at 30 °C reached values of 39 ± 1 °C. The maximum acoustic power corresponded to 6.7% of the nominal power value at 400 W. Increasing the nominal power from 0 to 400 W; the Ni content decreased from 85.3 to 75.2 wt%, and the W content increased from 15.1 to 25.1 wt%. The deposited coating at 200 W and 300 W had a smooth, homogeneous, and uniform surface. At 400 W, the acoustic cavitation promoted erosion, affecting the coating surface. X-ray diffraction analysis indicated that the nominal power of 200 W promoted electrodeposition of the Ni₁₇W₃ structure with the plane (111) as a preferred orientation. The crystallite size decreased for the planes (111) and (200) when increased nominal power from 100 to 200 W. The optimum condition for the improved corrosion resistance occurred with the nominal power of 200 W, providing a polarization resistance of 23.42 kΩ cm².

Keywords: Coating; Corrosion; HIUS; Ni–W alloy.