Preparation and hot corrosion properties of the AlCrFeCoNi0.5Si high-entropy alloy coating deposited by the air plasma spraying

Author:

Ghadami Farzin1ORCID,Davoudabadi Mohammad Amin2ORCID,Ghadami Soheil1ORCID

Affiliation:

1. Department of Materials Engineering, Tarbiat Modares University 1 , P.O. Box 14115-143, Tehran 14115-143, Iran

2. Department of Physics, Science and Research Branch, Islamic Azad University 2 , P.O. Box 11365-4435, Tehran 11365-4435, Iran

Abstract

Normal AlCrFeCoNi and Si-modified AlCrFeCoNi0.5Si high-entropy alloy (HEA) coatings were deposited on a Ni-based superalloy by air plasma spraying technique. Hot corrosion properties of the normal and Si-modified AlCrFeCoNi0.5Si HEA-coated samples were evaluated at 900 °C under the corrosive salt environment containing 45% Na2SO4 and 55% V2O5. The hot corrosion kinetics of both normal and Si-modified coatings were accordingly investigated using mass gain measurements. X-ray diffraction, field emission scanning electron microscopy, and energy dispersive x-ray analysis were used for the microstructural characterizations. The results indicated that the Si-modified AlCrFeCoNi0.5Si HEA coating has a greater resistance to hot corrosion compared with the normal AlCrFeCoNi HEA coating. The results obtained are primarily related to the formation of Si-rich precipitates, which inhibit the outward diffusion and, therefore, reduce the formation of the corrosion products on the AlCrFeCoNi0.5Si HEA coating surface.

Publisher

American Vacuum Society

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Condensed Matter Physics

Reference46 articles.

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