Table of Contents
Journal of Coatings
Volume 2013 (2013), Article ID 180740, 6 pages
http://dx.doi.org/10.1155/2013/180740
Research Article

Hot-Dip Aluminizing of Low Carbon Steel Using Al-7Si-2Cu Alloy Baths

1Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, India
2Department of Mechanical Engineering, Srinivasa School of Engineering, Mukka, Surathkal, Mangalore 575021, India

Received 17 May 2013; Accepted 14 August 2013

Academic Editor: Masahiro Fukumoto

Copyright © 2013 Prashanth Huilgol et al. 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.

Abstract

Hot-dip aluminizing of low carbon steel was done in molten Al-7Si-2Cu bath at 690°C for dipping time ranging from 300 to 2400 seconds. Characterization of the intermetallics layer was done by using scanning electron microscope with energy dispersive spectroscopy. Four intermetallic phases, -Al7Fe2Si, -FeAl3, -Fe2Al5, and -Al2Fe3Si3, were identified in the reaction layer. - Al7Fe2Si phase was observed adjacent to aluminum-silicon topcoat, -FeAl3 between and -Fe2Al5, -Fe2Al5 adjacent to base material, and -Al2Fe3Si3 precipitates within Fe2Al5 layer. The average thickness of Fe2Al5 layer increased linearly with square root of dipping time, while for the rest of the layers such relationship was not observed. The tongue-like morphology of Fe2Al5 layer was more pronounced at higher dipping time. Overall intermetallic layer thickness was following parabolic relationship with dipping time.