NDLI: Hot Corrosion Behavior of Low-Pressure Cold-Sprayed CoNiCrAlY Coatings

Content Provider	Springer Nature Link
Author	Zhang, L. W. Ning, X. J. Lu, L. Wang, Q. S. Wang, L.
Copyright Year	2016
Abstract	CoNiCrAlY coatings were deposited by low-pressure cold spraying and pre-oxidized in a vacuum environment, and its hot corrosion behavior in pure Na$_{2}$SO$_{4}$ and 75 wt.% Na$_{2}$SO$_{4}$ + 25 wt.% NaCl salts was investigated. The pre-oxidation treatment resulted in the formation of a dense and continuous α-Al$_{2}$O$_{3}$ scale on the coating surface. After being corroded for 150 h at 900 °C, the pre-oxidized coating exhibited better corrosion resistance to both salts than the as-sprayed coating. The presence of preformed Al$_{2}$O$_{3}$ scale reduced the consumption rate of aluminum, by delaying the formation of internal oxides and sulfides and promoting the formation of a denser and more adherent Al$_{2}$O$_{3}$ scale. Moreover, we investigated the corrosion mechanism of cold-sprayed CoNiCrAlY coatings in the two salts and discussed the effect of the pre-oxidation treatment.
Starting Page	587
Ending Page	594
Page Count	8
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	25
Issue Number	3
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2016-01-27
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cold spray hot corrosion MCrAlY coating oxidation pre-oxidation Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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