Bakhsheshi-Rad, H. R. and Hamzah, E. and Ismail, A. F. and Daroonparvar, M. and Yajid, M. A. M. and Medraj, M. (2016) Preparation and characterization of NiCrAlY/nano-YSZ/PCL composite coatings obtained by combination of atmospheric plasma spraying and dip coating on Mg-Ca alloy. Journal of Alloys and Compounds, 658 . pp. 440-452. ISSN 0925-8388
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Abstract
A triple-layer NiCrAlY/nano-yttria stabilized zirconia (nano-YSZ)/polycaprolactone (PCL) coating was deposited on Mg-Ca alloy by novel combination of atmospheric plasma spraying (APS) and dip coating methods, aiming at further enhancement of the corrosion and mechanical properties of the Mg alloy. The compressive strength of the triple-layer plasma/polymer coating is higher than that of the plasma coated and uncoated samples after immersion in 3.5 wt% NaCL solution. However, both single and dual-layer plasma coatings demonstrated better bonding strength than the triple-layer plasma/polymer coating. The corrosion resistance of Mg alloy was significantly improved by triple-layer NiCrAlY/nano-YSZ/PCL coating this was inferred from the lower corrosion current; 0.14 μA/cm2 versus 285.3 μA/cm2 for the uncoated Mg alloy, the higher corrosion potential; -1252.8 versus -1631.4 mVSCE, and the significantly lower corrosion rate; 0.003 versus 6.51 mm/yr. A corrosion mechanism for the single-, double- and triple-layer coated Mg alloy was proposed. PCL coating provides significant protection for the Mg alloy by sealing the porous nano-YSZ plasma coating.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Calcium, Calcium alloys, Compressive strength, Corrosion, Corrosion rate, Corrosion resistance, Mechanical properties, Plasma diagnostics, Plasma jets, Plasma spraying, Yttria stabilized zirconia, Zirconia, 3.5 wt NaCl solution, Atmospheric plasma spraying, Biodegradable, Corrosion mechanisms, Corrosion potentials, Dipcoating methods, Mg alloy, Stabilized zirconia, Composite coatings |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Mechanical Engineering |
| ID Code: | 73862 |
| Deposited By: | Haliza Zainal |
| Deposited On: | 20 Nov 2017 02:45 |
| Last Modified: | 20 Nov 2017 02:45 |
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