HOT CORROSION OF YTTRIUM STABILIZED ZIRCONIA COATINGS DEPOSITED BY AIR PLASMA SPRAY ON A NICKEL-BASED SUPERALLOY

N. Diaz Vallejo, O. Sanchez, J. C. Caicedo, W. Aperador and G. Zambrano
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N. Diaz Vallejo: Department of Physics, Universidad del Valle, Cali, Colombia
O. Sanchez: Department of Physics, Universidad del Valle, Cali, Colombia
J. C. Caicedo: #x2020;Universidad del Valle, Cali, Colombia, 1 Tribology, Powder Metallurgy and Processing of Solid Recycling Research Group, Universidad del Valle, Cali-Colombia
W. Aperador: #x2021;Department of Engineering, Universidad Militar Nueva Granada, Bogotá, Colombia
G. Zambrano: Department of Physics, Universidad del Valle, Cali, Colombia

Surface Review and Letters (SRL), 2017, vol. 24, issue 06, 1-13

Abstract: In this research, the electrochemical impedance spectroscopy (EIS) and Tafel analysis were utilized to study the hot corrosion performance at 700∘C of air plasma-sprayed (APS) yttria-stabilized zirconia (YSZ) coatings with a NiCrAlY bond coat grown by high velocity oxygen fuel spraying (HVOF), deposited on an INCONEL 625 substrate, in contact with corrosive solids salts as vanadium pentoxide V2O5 and sodium sulfate Na2SO4. The EIS data were interpreted based on proposed equivalent electrical circuits using a suitable fitting procedure performed with Echem AnalystTM Software. Phase transformations and microstructural development were examined using X-ray diffraction (XRD), with Rietveld refinement for quantitative phase analysis, scanning electron microscopy (SEM) was used to determinate the coating morphology and corrosion products. The XRD analysis indicated that the reaction between sodium vanadate (NaVO3) and yttrium oxide (Y2O3) produces yttrium vanadate (YVO4) and leads to the transformation from tetragonal to monoclinic zirconia phase.

Keywords: Thermal barrier coatings; yttria-stabilized zirconia; hot corrosion (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500846

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