Título:
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Nanocrystalline electrodeposited Fe-W/Al2O3 Composites : effect of Alumina Sub-microparticles on the mechanical, tribological, and corrosion properties
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Autor/a:
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Nicolenco, Aliona; Mulone, Antonio; Imaz, Naroa; Tsyntsaru, Natalia; Sort Viñas, Jordi; Pellicer Vilà, Eva Maria; Klement, Uta; Cesiulis, Henrikas; García-Lecina, Eva
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Abstract:
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Altres ajuts: Departamento de Desarrollo Económico y Competitividad of the Basque government (ELKARTEK, KK-2017/00096, KK-2018/00108) |
Abstract:
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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. |
Materia(s):
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-Iron alloys -Alumina -Composite coatings -Columnar growth -Wear resistance |
Derechos:
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open access
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Article |
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Uri:
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https://ddd.uab.cat/record/223896
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