Influence of plasma coatings on Inconel 617 for gas turbine applications

Abstract

The Inconel 617 with plasma sprayed Al₂O₃–40%TiO₂ (A40T) and NiCr–Cr₂O₃ coatings were investigated for the hot corrosion behaviour at 1000°C for gas turbine applications. The behaviour of the alloy under the mixed salt environment with and without V₂O₅ in Na₂SO₄ and NaCl was analysed by means of mass change per unit area, optical and SEM images along with X-ray diffraction and EDAX. Microstructural and EDAX analyses revealed presence of oxides, rich in Ni and Mo on the surface of the samples. The coated sample exhibited better corrosion resistance in A40T and NiCr – Cr₂O₃ coatings than bare alloy.

Keywords

Superalloy Coatings Hot corrosion Oxides Mass change XRD SEM/EDAX

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