Mechanical properties of electrodeposited nanocrystalline and ultrafine-grained Zn-Sn coatings

Esfahani, M, Munir, K, Wen, C, Zhang, J, Durandet, Y, Wang, J and Wong, Y 2018, 'Mechanical properties of electrodeposited nanocrystalline and ultrafine-grained Zn-Sn coatings', Surface and Coatings Technology, vol. 333, pp. 71-80.


Document type: Journal Article
Collection: Journal Articles

Title Mechanical properties of electrodeposited nanocrystalline and ultrafine-grained Zn-Sn coatings
Author(s) Esfahani, M
Munir, K
Wen, C
Zhang, J
Durandet, Y
Wang, J
Wong, Y
Year 2018
Journal name Surface and Coatings Technology
Volume number 333
Start page 71
End page 80
Total pages 10
Publisher Elsevier
Abstract This study investigates the effects of grain size on the mechanical properties of Zn-Sn alloy coatings. Nanocrystalline (average grain size = 78 ± 18 nm) and ultrafine-grained (average grain size = 423 ± 96 nm) Zn-Sn coatings were electrodeposited on steel substrates from gluconate electrolytes containing organic additives. The microstructure, surface roughness and mechanical properties of electrodeposited coatings were investigated using field emission scanning electron microscopy (FE-SEM), three dimensional (3D) surface profilometry, nano-hardness, nano-scratch and nano-wear tests. The average surface amplitude parameters such as mean surface roughness (Sa) and root mean square roughness (Sq) decreased by at least 80% while, hardness increased from 209 ± 66 MPa to 523 ± 140 MPa, due to grain refinement from ultrafine-grained to nanocrystalline structure. Nano-scratch results indicated that a deeper grove was formed on the surface of ultrafine-grained coatings than nanocrystalline coatings during the sliding process. For both coatings coefficient of friction increased gradually over the entire sliding duration and reached to maximum of 0.24 ± 0.04 and 0.12 ± 0.02 in ultrafine-grained and nanocrystalline coatings respectively. Wear volume of the coatings decreased by 64.5% due to grain refinement from ultrafine-grained to nanocrystalline structure.
Subject Metals and Alloy Materials
Composite and Hybrid Materials
Keyword(s) Electrodeposition
Nanocrystalline
Ultrafine-grained
Nano-hardness
Nano-scratch
Nano-wear
DOI - identifier 10.1016/j.surfcoat.2017.10.059
Copyright notice © 2017 Elsevier B.V. All rights reserved.
ISSN 0257-8972
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