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Microstructural, mechanical properties and corrosion behavior of plasma sprayed NiCrAlY/nano-YSZ duplex coating on Mg-1.2Ca-3Zn alloy

Bakhsheshi-Rad, Hamid Reza and Hamzah, Esah and Ismail, Ahmad Fauzi and Daroonparvar, Mohammadreza and Kasiri Asgarani, Masoud and Jabbarzare, Saeid and Medraj, Mamoun (2015) Microstructural, mechanical properties and corrosion behavior of plasma sprayed NiCrAlY/nano-YSZ duplex coating on Mg-1.2Ca-3Zn alloy. Ceramics International, 41 (10). pp. 15272-15277. ISSN 0272-8842

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Official URL: http://dx.doi.org/10.1016/j.ceramint.2015.08.025

Abstract

In this study, microstructural evolution, mechanical properties and corrosion behavior of plasma sprayed NiCrAlY/nano-yttria stabilized zirconia (nano-YSZ) dual-layered coating on Mg-1.2Ca-3Zn alloy were investigated. NiCrAlY underlayer is composed of large amount of porosities and micro-cracks with thickness around 80-90 µm. However, nano-YSZ overlayer shows bimodal microstructure consisting of columnar grains and some partially molten parts of the nanostructured powders with thickness around 270-300 µm. The microhardness of dual-layered NiCrAlY/nano-YSZ coating is significantly higher than that of single-layered NiCrAlY. Despite that, the bonding strength of dual-layered coating is slightly higher than single-layered plasma sprayed coating. Results also showed that both single-layer NiCrAlY and dual-layer NiCrAlY/nano-YSZ coatings decreased the corrosion current density of Mg alloy from 217.1 µA/cm2 to 114.5 and 82.4 µA/cm2, respectively.

Item Type:Article
Uncontrolled Keywords:corrosion behavior, magnesium alloy, plasma spray, yttria stabilized zirconia
Subjects:A General Works
ID Code:58552
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 12:07
Last Modified:07 Mar 2017 15:45

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