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High temperature corrosion behaviour of aluminised FC 25 cast iron using pack cementation

Somrerk Chandra-Ambhorn (High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand)
Neramit Krasaelom (High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand)
Tummaporn Thublaor (High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand)
Sirichai Leelachao (High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 19 December 2018

Issue publication date: 22 February 2019

113

Abstract

Purpose

This study aims to apply the pack cementation to develop the Fe-Al layers on the surface of FC 25 cast iron in order to increase the high-temperature corrosion resistance of the alloy.

Design/methodology/approach

Pack cementation was applied on the surface of FC 25 cast iron at 1,050°C. The bare and aluminised alloys were subjected to the oxidation test in 20 per cent O2-N2 at 850 °C. Scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy and X-ray diffraction (XRD) were used for characterisation.

Findings

The layers of pack cementation consisted of Fe2Al5, FeAl2 and FeAl, and solid solution alloyed with Al. The oxidation kinetics of the bare cast iron was parabolic. Mass gain of the aluminised cast iron was significantly decreased compared with that of the bare cast iron. This was because of the protective alumina formation on the aluminised alloy surface. Al in the Fe–Al layer also tended to be homogenised during oxidation.

Originality/value

Even though the aluminising of alloys was extensively studied, the application of that process to the FC 25 cast iron grade was originally developed in this work. The significantly reduced mass gain of the aluminised FC 25 cast iron makes the studied alloy be promising for the use as a valve seat insert in an agricultural single-cylinder four-stroke engine, which might be run by using a relatively cheaper fuel, i.e. LPG, but as a consequence requires the higher oxidation resistance of the engine parts.

Keywords

Acknowledgements

The authors acknowledge the Higher Education Commission of Thailand and King Mongkut’s University of Technology North Bangkok, Thailand (Contract no. KMUTNB–NRU–57–01).

Citation

Chandra-Ambhorn, S., Krasaelom, N., Thublaor, T. and Leelachao, S. (2019), "High temperature corrosion behaviour of aluminised FC 25 cast iron using pack cementation", Anti-Corrosion Methods and Materials, Vol. 66 No. 2, pp. 236-241. https://doi.org/10.1108/ACMM-12-2017-1876

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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