NDLI: Stepwise Depletion of Coating Elements as a Result of Hot Corrosion of NiCrAlY Coatings

Content Provider	Springer Nature Link
Author	Rana, Nidhi Jayaganthan, R. Prakash, Satya
Copyright Year	2013
Abstract	Present investigation deals with the hot corrosion behaviour of the NiCrAlY coatings deposited by HVOF technique on Superni76 under cyclic conditions at 900 °C in the presence of Na$_{2}$SO$_{4}$ + 60% V$_{2}$O$_{5}$ salt. The weight change behaviour of the coatings was followed with time up to 200 cycles and K $_{p}$ value was calculated for the hot corrosion process. Surface and cross-section of the corroded samples were examined by FESEM/EDS and XRD to follow the progress of corrosion up to 200 cycles. In earlier cycles, the corrosive species oxidised top surface of the coatings. With increasing number of cycles, oxidation of the coatings occurred up to 40-μm depth. A Cr-depleted band was seen below the oxide scale. Further increase in number of cycles led to migration and oxidation of Al to form Al$_{2}$O$_{3}$ sublayer at coating/scale interface, thereby leading to formation of Al-depleted zone in the coating below the Al$_{2}$O$_{3}$ sublayer. The corrosion resistance of the NiCrAlY coatings is attributed to the formation of the continuous and dense Al$_{2}$O$_{3}$ sublayer at the coating/scale interface, which acts as barrier to the migration of Cr to the surface. The appearance of Al$_{3}$Y after 100 and 200 cycles also contributes to the increased corrosion resistance of coatings after 100 and 200 cycles.
Starting Page	643
Ending Page	650
Page Count	8
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	23
Issue Number	2
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2013-11-09
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	coatings hot corrosion oxidation scale Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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