Preprint Article Version 1 This version is not peer-reviewed

Formation of Nanoporous Mixed Aluminum-Iron Oxides by Self-Organized Anodizing of FeAl3 Intermetallic Alloy

Version 1 : Received: 24 June 2019 / Approved: 25 June 2019 / Online: 25 June 2019 (12:58:43 CEST)

A peer-reviewed article of this Preprint also exists.

Chilimoniuk, P.; Michalska-Domańska, M.; Czujko, T. Formation of Nanoporous Mixed Aluminum-Iron Oxides by Self-Organized Anodizing of FeAl3 Intermetallic Alloy. Materials 2019, 12, 2299. Chilimoniuk, P.; Michalska-Domańska, M.; Czujko, T. Formation of Nanoporous Mixed Aluminum-Iron Oxides by Self-Organized Anodizing of FeAl3 Intermetallic Alloy. Materials 2019, 12, 2299.

Journal reference: Materials 2019, 12, 2299
DOI: 10.3390/ma12142299

Abstract

Nanostructured anodic oxide layers on an FeAl3 intermetallic alloy were prepared by two-step anodization in 20 wt.% H2SO4 at 0°C. The voltage range was 10.0 – 22.5 V with a step of 2.5 V. The structural and morphological characterizations of the received anodic oxide layers were performed by FE-SEM. Therefore, the formed anodic oxide was found to be highly porous with a high surface area, as indicated by the FE-SEM studies. It has been shown that the morphology of fabricated nanoporous oxide layers is strongly affected by the anodization potential. The oxide growth rate first increased slowly (from 0.010 μm/s for 10 V to 0.02 μm/s for 15 V) and then very rapidly (from 0.04 μm/s for 17.5 V up to 0.13 μm/s for 22.5 V). The same trend was observed for the change in the oxide thickness. Moreover, for all investigated anodizing voltages, the structural features of the anodic oxide layers, such as the pore diameter and interpore distance, increase with increasing anodizing potential. The obtained anodic oxide layer was identified as a crystalline FeAl2O4, Fe2O3 and Al2O3 oxide mixture.

Subject Areas

Anodization; nanopores; oxides; self-organization; FeAl3; intermetallic alloys

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