Isothermal Oxidation Behavior of Aluminized AISI 1020 Steel at the Temperature of 700 oC

Mohammad Badaruddin, Suharno Suharno, Hanif Ari Wijaya


The AISI 1020 steel was coated by dipping it into the molten Al bath at 700 °C for 16s. The coating layer formed on the steel substrate is consisting of Al with a little Fe, FeAl3 and Fe2Al5 layers. The morphologies of the FeAl3 and Fe2Al5 layers are platelet and columnar structures, respectively. The oxidation test was carried out isothermally at 700 °C for a various time of 1-49 h in static air. The oxidation behaviors of both of the bare steel and the aluminized steel were studied by the oxidation kinetics, surface morphologies and phase transformation after oxidation testing. The oxidation products were characterized using Optical Microscope (OM), Scanning Electron Microscopy with Electron Dispersive Spectroscopy (SEM/EDS) and X-ray diffraction analysis. The magnitude of the rate constant (kp) of the aluminized steel is two order lower than the bare steel. The formations of intermetallic phases on the steel substrate for a shorter time are dominated by the interdiffusion between the inward diffusion of Al-atoms into the steel substrate and outward diffusion of Fe-atoms. The constituent phases in the aluminide layer compose of FeAl2, Fe2Al5 and FeAl. The formation ofFeAlphase is controlled by the inward diffusion of Fe-atoms into the Fe2Al5 phase. The improvement of the oxidation resistance of the aluminized steel subjected to severe oxidation is due to the formation of protective Al2O3scale.


Aluminized AISI 1020 steel, oxidation kinetics, intermetallic phase, Al2O3.

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  1. Qiao, L. and Yan, L.H., Stress Corrosion Cracking of AISI 321 Stainless Steel in Acidic Chloride Solution, Mater. Sci., 25, 1998, pp. 47-51.
  2. Kalivodova, J., Baxter, D., Schutze, M., and Rohr, V., Gaseous Corrosion of Alloys and Novel Coatings in Simulated Environments for Coal, Waste and Biomass Boilers, Mater. Corr., 56(12), 2005, pp. 882-889.[CrossRef]
  3. Erlindo, C., Angcoy, Jr., Archibald, L.A., Romeo, P.A., Garry, F.C., Melvin, D.L., Christine H.S., and Ruperto Jr.R.V., Mechanisms of Erosion-Corrosion in Well 311D, South Sambaloran, Leyte Geothermal Production Field, Proc. World Geothermal Congress, Bali, Indonesia, 2010.
  4. Ghosh, S.J., Failure Analysis of a Jacking Oil Pump, Fail. Anal. Prevent, 7, 2007, pp. 23-27.[CrossRef]
  5. Cédric, N.H., Factors Affecting Costs Geothermal Power Development, the Geothermal Energy Association for the U.S Department of Energy, 2005.
  6. Badaruddin, M., Improvement of High Temperature Oxidation of Low Carbon Steel Exposed to Ethanol Combustion Product at 700 oC by Hot-Dip Aluminizing Coating, Makara Seri Teknologi, 15(2), 2011, pp. 137-142.
  7. Cheng, W.J. and Wang, C.J., Growth of Intermetallic Layer in the Aluminide Mild Steel During Hot-Dipping, Surf. Coat. Technol, 204, 2009, pp. 824-828.[CrossRef]
  8. Mc Kamey, C.G., In: Stoloff, N.S., and Sikka, V.K., Editors, Physical Metallurgy and Processing of Intermetallic Compounds, Chapman Hall, New York, 1996, p. 351.[CrossRef]
  9. Neumann, G. and Mehrer, H., Edition, Diffusion in Solid Metals and Alloys, Numerical Data and Functional Relationships in Science and Technology, Springer, 261, 1999, p. 152.
  10. Chen, S.M. and Wang, C.J., The High-Temperature Oxidation Behavior of Hot-Dipping Al-Si Coating on Low Carbon Steel, Surf. Coat. Technol., 200, 2006, pp. 6601-6605.[CrossRef]
  11. Kobayashi, S. and Yakou, T., Control of Intermetallic Compound Layers at Interface Between Steel and Aluminum by Diffusion-Treatment, Mater. Sci. Eng. A, 338, 2002, pp. 44-53.[CrossRef]
  12. Wang, C.J., and Badaruddin, M.,The dependence of high temperature resistance of aluminized steel exposed to water-vapour oxidation, Surf. Coat. Technol, 205, 2010, pp. 1200-1205.[CrossRef]