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Journal of Materials Engineering and Performance

, Volume 21, Issue 10, pp 2074–2079 | Cite as

Pack Cementation Coatings for High-Temperature Oxidation Resistance of AISI 304 Stainless Steel

  • Morteza Zandrahimi
  • Javad Vatandoost
  • Hadi Ebrahimifar
Article

Abstract

Aluminum and titanium are deposited on the surface of steel by the pack cementation method to improve its hot-corrosion and high-temperature oxidation resistance. In this research, coatings of aluminum and titanium and a two-step coating of aluminum and titanium were applied on an AISI 304 stainless steel substrate. The coating layers were examined by carrying out scanning electron microscopy (SEM) and x-ray diffraction (XRD). The SEM results showed that the aluminized coating consisted of two layers with a thickness of 450 μm each, the titanized coating consisted of two layers with a thickness of 100 μm each, and the two-step coatings of Al and Ti consisted of three layers with a thickness of 200 μm each. The XRD investigation of the coatings showed that the aluminized coating consisted of Al2O3, AlCr2, FeAl, and Fe3Al phases; the titanized layers contained TiO2, Ni3Ti, FeNi, and Fe2TiO5 phases; and the two-step coating contained AlNi, Ti3Al, and FeAl phases. The uncoated and coated specimens were subjected to isothermal oxidation at 1050 °C for 100 h. The oxidation results revealed that the application of a coating layer increased the oxidation resistance of the coated AISI 304 samples as opposed to the uncoated ones.

Keywords

AISI 304 stainless steel aluminizing oxidation titanizing two-step deposition of Al and Ti 

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Copyright information

© ASM International 2012

Authors and Affiliations

  • Morteza Zandrahimi
    • 1
  • Javad Vatandoost
    • 1
  • Hadi Ebrahimifar
    • 1
  1. 1.Department of Metallurgy and Materials Science, Faculty of EngineeringShahid Bahonar University of KermanKermanIran

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