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

SURFACE & COATINGS TECHNOLOGY

卷:333

Article

Esfahani, Mahsa¹  Munir, Khurram S.²  Wen, Cuie²  Zhang, Jie^3,4  Durandet, Yvonne¹  Wang, James¹  Wong, Yat Choy¹ 

[1] Swinburne Univ Technol, Fac Sci Engn & Technol, Hawthorn, Vic 3122, Australia

[2] RMIT Univ, Sch Engn, Melbourne, Vic 3001, Australia

[3] Monash Univ, Ctr Excellence Electromat Sci, Sch Chem, Clayton, Vic 3168, Australia

[4] Monash Univ, Ctr Excellence Electromat Sci, Australian Res Council, Clayton, Vic 3168, Australia

关键词: Electrodeposition;    Nanocrystalline;    Ultrafine-grained;    Nano-hardness;    Nano-scratch;    Nano-wear;   

DOI  :  10.1016/j.surfcoat.2017.10.059

来源: Elsevier

【 摘 要 】

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 (S-a) and root mean square roughness (S-q) decreased by at least 80% while, hardness increased from 209 +/- 66 MPa to 523 +/- 140 MPa, due to grain refinement from ultrafine-grained to nano crystalline 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.

【 授权许可】

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