Nanocrystalline electrodeposited Fe-W/Al 2 O 3 Composites: Effect of Alumina Sub-microparticles on the Mechanical, Tribological, and Corrosion Properties

Nicolenco Aliona; Mulone A.; Imaz Naroa; Tsyntsaru Natalia; Sort Jordi Julia; Pellicer Eva; Klement Uta; Cesiulis Henrikas; Garcia-Lecina Eva

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NICOLENCO, Aliona, MULONE, A., IMAZ, Naroa, TSYNTSARU, Natalia, SORT, Jordi Julia, PELLICER, Eva, KLEMENT, Uta, CESIULIS, Henrikas, GARCIA-LECINA, Eva. Nanocrystalline electrodeposited Fe-W/Al 2 O 3 Composites: Effect of Alumina Sub-microparticles on the Mechanical, Tribological, and Corrosion Properties. In: Frontiers in Chemistry, 2019, nr. 7, p. 0. ISSN 2296-2646. DOI: https://doi.org/10.3389/fchem.2019.00241

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Frontiers in Chemistry

Numărul 7 / 2019 / ISSN 2296-2646

Nanocrystalline electrodeposited Fe-W/Al ₂ O ₃ Composites: Effect of Alumina Sub-microparticles on the Mechanical, Tribological, and Corrosion Properties

DOI:https://doi.org/10.3389/fchem.2019.00241

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Nicolenco Aliona¹², Mulone A.³, Imaz Naroa⁴, Tsyntsaru Natalia¹², Sort Jordi Julia⁵⁶, Pellicer Eva⁶, Klement Uta³, Cesiulis Henrikas¹, Garcia-Lecina Eva⁴

¹ Vilnius University,
² Institute of Applied Physics,
³ Chalmers Univesity of Technology,
⁴ Centro de Investigacion Tecnológica En Electroquimica,
⁵ University of Barcelona,
⁶ Institució Catalana de Recerca i Estudis Avançats (ICREA)

Disponibil în IBN: 2 mai 2019

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In this study, nanocrystalline Fe-W alloy and Fe-W/Al ₂ O ₃ 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 Al ₂ O ₃ 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/Al ₂ O ₃ composites is attributed to the apparent grain size refinement/amorphization and the nanoporosity surrounding the embedded Al ₂ O ₃ particles. In the presence of 12 vol% of Al ₂ O ₃ 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/Al ₂ O ₃ composite coatings into various systems working under dry friction conditions, for example, in high-temperature vacuum systems.

Cuvinte-cheie
Alumina, Columnar growth, Composite coatings, Iron alloys, wear resistance

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