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Materials 2019, 12(2), 216; https://doi.org/10.3390/ma12020216

Heat Treatment of AZ91 Magnesium Alloy Coated with an Al2O3 Thin Film with Fluidized Bed Technology

1
Dipartimento di Ingegneria Industriale e dell’Informazione e di Economia, University of L’Aquila, Via G. Gronchi 18, 67100 L’Aquila, Italy
2
Università della Tuscia, DEIM, Largo dell’Università, 01100 Viterbo, Italy
3
Dipartimento di Ingegneria dell’Impresa “Mario Lucertini”, University of Rome of Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy
*
Author to whom correspondence should be addressed.
Received: 11 December 2018 / Revised: 2 January 2019 / Accepted: 6 January 2019 / Published: 10 January 2019
(This article belongs to the Section Manufacturing Processes and Systems)
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Abstract

Fluidized bed technology is a methodology widely known in the manufacturing environment for surface treatment of metals. Within the field of surface coating, it has already been exploited for the coating of a magnesium alloy creating a compact layer of Al2O3. The result was an improvement in mechanical and tribological properties, along with improved corrosion resistance. In this context, the work proposed is addressed towards the evaluation of the effects of thermal post-treatment on the alumina coating produced by means of the fluidized-bed technology. To analyse the effects of heat treatments the morphology, composition and hardness of the samples were investigated along with adhesion and wear resistance of the alumina film. The results obtained show how the temperature affects the surface morphology and promotes the diffusion of magnesium towards the alumina superficial layer. The mechanisms triggered by heat treatments increase the adhesion of the surface film obtained in the deposition process, improving its mechanical and tribological properties. View Full-Text
Keywords: fluidized bed (FB); magnesium alloy; alumina coating; heat treatment; functional coating fluidized bed (FB); magnesium alloy; alumina coating; heat treatment; functional coating
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Baiocco, G.; Rubino, G.; Ucciardello, N. Heat Treatment of AZ91 Magnesium Alloy Coated with an Al2O3 Thin Film with Fluidized Bed Technology. Materials 2019, 12, 216.

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