Table of Contents
ISRN Metallurgy
Volume 2013 (2013), Article ID 191723, 6 pages
http://dx.doi.org/10.1155/2013/191723
Research Article

Aluminising of Mild Steel Plates

Department of Metallurgical and Materials Engineering, NITK, Surathkal 575025, India

Received 29 November 2012; Accepted 16 January 2013

Academic Editors: Y. Yamabe-Mitarai and T. Yue

Copyright © 2013 Udaya Bhat Kuruveri 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 aluminising of low carbon steel was done at temperatures 690°C and 750°C for dipping time ranging from 300 to 2400 seconds. During aluminising a mixture of ZnCl2 and NH4Cl was used as flux. During aluminising components of the flux decomposed and zinc formed interacted with the Fe and Al. The aluminised samples were characterised for iron-aluminium intermetallic layer formation, morphology, and local composition. It was observed that intermetallic layer was predominantly Fe2Al5 and FeAl3 at 690°C and at 750°C coating consisted of FeAl3 layer and a layer with Al/Fe ratio greater than 3.26. For both temperatures, coating thickness increased with increase in time. For a given dipping time, deposition was less at higher temperature and this is attributed to changes in the kinetics of growth of individual layers due to dissolved zinc in the aluminium, at 750°C. Also, spalling of intermetallic layers was observed at elevated temperatures and longer dipping times.