Nanocrystalline electrodeposited Fe-W/Al2O3 Composites : effect of Alumina Sub-microparticles on the mechanical, tribological, and corrosion properties
Nicolenco, Aliona (Institute of Applied Physics (Moldova))
Mulone, Antonio (Chalmers University of Technology. Department of Industrial and Materials Science (Sweden))
Imaz, Naroa (CIDETEC)
Tsyntsaru, Natalia (Vilnius University. Department of Physical Chemistry (Lithuania))
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Pellicer Vilà, Eva Maria (Institució Catalana de Recerca i Estudis Avançats)
Klement, Uta (Chalmers University of Technology. Department of Industrial and Materials Science (Sweden))
Cesiulis, Henrikas (Vilnius University. Department of Physical Chemistry (Lithuania))
García-Lecina, Eva (CIDETEC)

Data:	2019
Resum:	In this study, nanocrystalline Fe-W alloy and Fe-W/Al2O3 composite coatings with various contents of sub-microsized alumina particles have been obtained by electrodeposition from an environmentally friendly Fe(III)-based electrolyte with the aim to produce a novel corrosion and wear resistant material. The increase in volume fraction of Al2O3 in deposits from 2 to 12% leads to the grain refinement effect, so that the structure of the coatings change from nanocrystalline to amorphous-like with grain sizes below 20 nm. Nevertheless, the addition of particles to the Fe-W matrix does not prevent the development of a columnar structure revealed for all the types of studied coatings. The observed reduction in both hardness and elastic modulus of the Fe-W/Al2O3 composites is attributed to the apparent grain size refinement/amorphization and the nanoporosity surrounding the embedded Al2O3 particles. In the presence of 12 vol% of Al2O3 in deposits, the wear rate decreases by a factor of 10 as compared to Fe-W alloy tested under dry friction conditions due to the lowering of tribo-oxidation. The addition of alumina particles slightly increases the corrosion resistance of the coatings; however, the corrosion in neutral chloride solution occurs through the preferential dissolution of Fe from the matrix. The obtained results provide a possibility to integrate the nanocrystalline Fe-W/Al2O3 composite coatings into various systems working under dry friction conditions, for example, in high-temperature vacuum systems.
Ajuts:	European Commission 642642 European Commission 778357 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 Ministerio de Economía y Competitividad MAT2017-86357-C3-1-R Ministerio de Economía y Competitividad MAT2017-86357-C3-2-R
Nota:	Altres ajuts: Departamento de Desarrollo Económico y Competitividad of the Basque government (ELKARTEK, KK-2017/00096, KK-2018/00108)
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Iron alloys ; Alumina ; Composite coatings ; Columnar growth ; Wear resistance
Publicat a:	Frontiers in chemistry, Vol. 7 (April 2019) , art. 241, ISSN 2296-2646

DOI: 10.3389/fchem.2019.00241
PMID: 31041307

15 p, 5.8 MB

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