Author/Authors :
Mohsenifar، A. نويسنده School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran , , Aboutalebi، M. R. نويسنده Center of Excellence for High Strength Alloys Technology, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Iran, Tehran. , , Seyedein، S. H. نويسنده Center of Excellence for Advanced Materials and Processing (CEAMP), School of Materials and Metallurgical Engineering, Iran University of Science and Technology, Tehran, Iran. ,
Abstract :
Hot dip aluminizing was carried out on the low carbon steel rod under optimized conditions. The aluminized
samples were further oxidized at 1000? C in air atmosphere at two different times of 20 and 60 minutes. Microstructure
study and phase analysis were studied by scanning electron microscopy and X-ray diffraction methods, respectively.
The characterization of the coating showed that, Fe2Al5 has been the major phase formed on the surface of specimen
before heat treatment. Following the oxidation of the coating at high temperature, Al2O3 was formed on the surface of
coating while Fe2Al5 transformed into FeAl and Fe3Al which are favorable to the hot corrosion resistance of the
coating. Corrosion resistance of aluminized samples before and after heat treatment was evaluated by rotating the
samples in the molten aluminum at 700 ?C for various times and the dissolution rate was determined. The obtained
results showed that by oxidizing the coating at high temperature, the corrosion resistance of the samples in molten
aluminum improves significantly.
