Oxidation of Metals

, Volume 91, Issue 1–2, pp 159–175 | Cite as

Effect of Zirconium Addition on High-Temperature Cyclic Oxidation of Diffusion Chromo-Aluminized Ni-Base Superalloy

  • Mohamed Ali ElhelalyEmail author
  • Mohamed Aziz ElZomor
  • Mohamed Hussien Ahmed
  • Ahmed Osman Youssef
Original Paper


Nimonic 75 alloy was coated with two different types of coatings: chromo-aluminized coating and Zr-doped chromo-aluminized coating. Diffusion coating was carried out by pack cementation process at 1000 °C for 8 h. Cyclic oxidation tests of Nimonic 75 and its coated specimens were conducted at 900, 1000 and 1100 °C in air for a total period of 100 h. During the first 30-h period, 5-h cycle was applied, and during the 40–100-h period, 10-h cycle was applied. The structures of the coated Nimonic 75 alloy before and after high-temperature oxidation were investigated using light microscopy, scanning electron microscopy/energy-dispersive spectroscopy and X-ray diffraction characterization techniques. The results indicated that Zr-doped chromo-aluminide coating is more effective than chromo-aluminide coating in increasing the oxidation resistance of Nimonic 75 alloy. The parabolic oxidation rate constant kp for cyclic oxidation of uncoated , Cr–Al-coated and Zr/Cr–Al-coated alloys are 1.7, 0.77 and 0.61 10−6 mg2 cm−4 s−1 at 900 °C, and 10.08, 5.2 and 3.91 10−6 mg2 cm−4 s−1 at 1000 °C, and 41.27, 26.69 and 18.13 10−6 mg2 cm−4 s−1 at 1100 °C. The improvement in oxidation resistance by zirconium addition to the chromo-aluminized coating is attributed to its effect on achieving better control of interdiffusion fluxes occurring between coating and substrate so as to reduce Kirkendall effect and voids formation, hence enhancing adhesion, in addition to reducing the outward diffusion of aluminum and stabilizing aluminum oxide scale.


Nimonic 75 Pack cementation process Zr/chromo-aluminized coating Cyclic oxidation Superalloys Diffusion coating 


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Mohamed Ali Elhelaly
    • 1
    Email author
  • Mohamed Aziz ElZomor
    • 1
  • Mohamed Hussien Ahmed
    • 1
  • Ahmed Osman Youssef
    • 2
  1. 1.Heat Treatment DepartmentTabbin Institute for Metallurgical StudiesCairoEgypt
  2. 2.Chemistry Department, Faculty of ScienceAins Shams UniversityCairoEgypt

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