Corrosion resistance and hydrophilic properties of plasma sprayed Ni+5%Al coatings

Mojtaba Rezaee Hajideh; Mohammadreza Farahani; Mohammadjavad Pakravan; Ali Shahmirzalo

doi:10.1016/j.heliyon.2019.e01920

Corrosion resistance and hydrophilic properties of plasma sprayed Ni+5%Al coatings

Heliyon. 2019 Jun 18;5(6):e01920. doi: 10.1016/j.heliyon.2019.e01920. eCollection 2019 Jun.

Authors

Mojtaba Rezaee Hajideh¹, Mohammadreza Farahani¹, Mohammadjavad Pakravan², Ali Shahmirzalo¹

Affiliations

¹ School of Mechanical Engineering, College of Engineering, University of Tehran, Iran.
² School of Mechanical Engineering, Aborz Campus, University of Tehran, Iran.

Abstract

In this research, the AZ31 Mg alloy was coated with Ni5Al powder, using a plasma spray method. Effects of nuzzle distance and number of passes on corrosion behavior, hydrophilic properties and phase structure of the coated layer were studied. Samples in different distance of nozzle (150 and 300 mm) and different number of passes (2, 4 and 6) were examined. Corrosion behavior characterization was carried out using electrochemical impedance spectroscopy and potentiodynamic polarization methods. Hydrophilic properties of the coated layer were also investigated by the contact angle method. Results showed that by increasing the number of passes, the corrosion resistance and the contact angle were increased. On the other side, by increasing the nuzzle distance, the corrosion resistance and the contact angle were decreased. The Coated sample with 6 pass coating and nozzle distance of 150 mm had the best corrosion behavior and hydrophilic properties.

Keywords: Contact angle; Corrosion resistance; Mechanical engineering; Nickel aluminum powder; Plasma spraying; Potentiodynamic measurement.