Comparative hot corrosion performance of APS and Detonation sprayed CoCrAlY, NiCoCrAlY and NiCr coatings on T91 boiler steel
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
Hot corrosion performance of Atmospheric Plasma Spray (APS) and Detonation spray (DSC) CoCrAlY, NiCoCrAlY, and NiCr coatings on T91 steel were investigated at 650 °C for 100 cycles under Na<inf>2</inf>SO<inf>4</inf>-K<inf>2</inf>SO<inf>4</inf>-Fe<inf>2</inf>O<inf>3</inf> mixed salt deposit in ambient air. The hot corrosion resistance of DSC coatings was found to be superior to their APS counterparts. Chromia and spinel oxides provided excellent corrosion resistance while no ?-Al<inf>2</inf>O<inf>3</inf> was observed. DSC NiCr and APS NiCoCrAlY offered the most and the least corrosion resistance, respectively. DFT calculation was performed to validate the thermodynamic stability of each oxide and identify the precise oxide formation. © 2021 Elsevier Ltd
Description
Keywords
Alumina, Aluminum oxide, Binary alloys, Chromium steel, Cobalt alloys, Corrosion resistance, Corrosion resistant coatings, Detonation, Hematite, High temperature corrosion, Nickel steel, Plasma spraying, Potash, Sodium sulfate, Sprayed coatings, Steel corrosion, Thermodynamic stability, A cobalt, A metal coating, A nickel, Atmospheric plasma spray, B SEM, B XRD, C hot corrosion, Corrosion performance, Hot corrosion, NiCoCrAlY coatings, Chromium alloys
Citation
Corrosion Science, 2021, 189, , pp. -