Characterization of pack cemented Ni2Al3 coating exposed to KCl(s) induced corrosion at 600 °C. (4th May 2018)

• Record Type: Journal Article
• Authors: Dahl, K. V.; Slomian, A.; Lomholt, T. N.; Kiamehr, S.; Grumsen, F. B.; Montgomery, M.; Jonsson, T.
• Is Part Of: Materials at high temperatures. Volume 35:Number 1/2/3(2018)
• Page Start: 267
• Page End: 274
• Publication Date: 2018-05-04
• Subjects: Nickel aluminide -- KCl, high temperature corrosion, 600 °C -- electron microscopy; Materials at high temperatures -- Periodicals; High temperatures -- Periodicals; 620.1121705
• DOI: 10.1080/09603409.2017.1392112
• Languages: English
• ISSNs: 0960-3409

Abstract

Abstract: Oxidation of Ni2 Al3 produced by pack aluminizing of pure nickel was studied with and without 0.10 mg cm −2 KCl(s) deposit in an environment containing 5% O2, 40% H2 O and 55% N2 at 600 °C for up to 168 h. Oxide microstructure and composition was investigated by SEM/EDX, BIB, TEM and GDOES. Oxidised Ni2 Al3 shows minimal weight gain, while adding KCl results in a small weight loss consistent with evaporation of KCl. On the surface of samples exposed to the gas environment only, a 30 nm oxide of Al oxide was present, but where KCl was present as deposit, 50–250 nm thick nodules form that are enriched in K, O and Al.