Synthesis, microstructure and corrosion behavior of compositionally graded Ni-YSZ diffusion barrier coatings on inconel-690 for applications in high temperature environments. (1st May 2018)

• Record Type: Journal Article
• Authors: Kirubaharan, A.M. Kamalan; Kuppusami, P.; Priya, R.; Divakar, R.; Gupta, M.; Pandit, Dinesh; Ningshen, S.
• Is Part Of: Corrosion science. Volume 135(2018)
• Page Start: 243
• Page End: 254
• Publication Date: 2018-05-01
• Subjects: Ni-YSZ graded coating -- Microstructure -- Surface morphology -- Composition analysis -- Inter-diffusion -- Corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.02.053
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Graded Ni-YSZ nanocomposite coatings have been developed using EB-PVD as diffusion barrier. Compositional analysis of and across the graded Ni-YSZ coatings using EPMA and SIMS studies. Potentiodynamic and EIS study of as-deposited and heat treated Ni-YSZ coating. Enhanced corrosion resistance for the heat treated Ni-YSZ coatings than that of as-deposited Ni-YSZ and YSZ coatings. Abstract: Cubic YSZ coating and compositionally graded Ni-YSZ nanocomposite coating have been developed on Inconel-690 using electron beam physical vapor deposition technique to act as a chemical diffusion barrier. The microstructure and chemical composition of the graded coating have been characterized by X-ray diffraction, atomic force microscopy, scanning electron microscopy, electron probe microanalysis, X-ray photoelectron spectroscopy and secondary ion mass spectroscopy techniques. Electrochemical corrosion study was carried out in 3 M HNO3 medium and it was found that compositionally graded Ni-YSZ coating heat treated at 1273 K in air showed superior corrosion resistance than as-deposited compositionally graded Ni-YSZ and YSZ coatings on Inconel-690 substrate.