Microstructural, mechanical properties and corrosion behavior of plasma sprayed NiCrAlY/nano-YSZ duplex coating on Mg-1.2Ca-3Zn alloy
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...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Published: |
Elsevier Ltd.
2015
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| Subjects: | |
| Online Access: | http://eprints.utm.my/58552/ http://eprints.utm.my/58552/ http://eprints.utm.my/58552/ |
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| Summary: | 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. |
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