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Coatings 2017, 7(6), 83; doi:10.3390/coatings7060083

Aluminizing via Ionic Liquid Electrodeposition and Pack Cementation: A Comparative Study with Inconel 738 and a CoNiCrAlY

1
Turbocoating s.p.a., Via Mistrali 7, 43040 Rubbiano di Solignano, Italy
2
Dipartimento di Chimica, Università di Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
3
MT Consulting, Mainzerstrasse 15, 80804 Munich, Germany
4
Dipartimento di Ingegneria Industriale, Università di Firenze, via di S. Marta 3, 50139 Firenze, Italy
5
Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, via Giusti 9, 50123 Firenze, Italy
6
Istituto Sistemi Complessi (ISC-CNR), via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
*
Author to whom correspondence should be addressed.
Received: 1 May 2017 / Revised: 6 June 2017 / Accepted: 15 June 2017 / Published: 19 June 2017
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Abstract

A novel aluminizing process based upon room temperature Al-electrodeposition from Ionic Liquids followed by diffusion heat treatment was applied on bare- and CoNiCrAlY-coated Inconel 738 (IN738). The aluminized samples were tested by isothermal oxidation at 1000 °C in air. The microstructural and chemical evolution of the samples were determined as function of oxidation time and compared with the currently applied coatings obtained via pack cementation. The newly proposed method is suitable for the CoNiCrAlY coating, but not for the bare IN738. In the latter, the formed Al-enriched layer is much thinner and the anticorrosion properties resulted in being reduced. This is probably due to the presence of precipitates, which slow down the aluminum inward diffusion impairing the formation of a well-developed interdiffusion zone (IDZ). Traces of the electrolyte, embedded during the Al-electrodeposition process, can be seen as the origin of these precipitates. View Full-Text
Keywords: ionic liquids; electrodeposition; aluminum; isothermal test; NiAl; Ni superalloys; gas turbine; SEM-EDX; coatings ionic liquids; electrodeposition; aluminum; isothermal test; NiAl; Ni superalloys; gas turbine; SEM-EDX; coatings
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MDPI and ACS Style

Tagliaferri, L.; Berretti, E.; Giaccherini, A.; Martinuzzi, S.M.; Bozza, F.; Thoma, M.; Bardi, U.; Caporali, S. Aluminizing via Ionic Liquid Electrodeposition and Pack Cementation: A Comparative Study with Inconel 738 and a CoNiCrAlY. Coatings 2017, 7, 83.

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