Electrochemical characterization of chromia- and alumina-forming nickel-based superalloys in molten silicates

Electrochemical characterization of chromia- and alumina-forming nickel-based superalloys in... Article history: A comparison of the corrosion behaviour of simplified chromia- and alumina-forming alloys (Ni–30Cr Received 27 May 2015 and Ni–8Al–28Cr) in molten glass is performed via electrochemical methods. A pre-oxidation treatment Received in revised form 9 September 2015 in air prior to immersion ensured the formation of a 2-m-thick oxide scale of Cr O or Al O . The lifetime 2 3 2 3 Accepted 25 October 2015 of Ni–30Cr depended on the competition between the oxide growth and its dissolution in the melt. For Available online 11 November 2015 Ni–8Al–28Cr, the high solubility of alumina in the melt studied here led to severe aluminium loss in a few minutes and clearly demonstrated the higher efficiency of chromia-forming alloys for molten glass Keywords: applications. Molten silicates © 2015 Elsevier B.V. All rights reserved. Superalloys High temperature corrosion Passivity Electrochemical characterization 1. Introduction protective oxide layer (i.e., Al O ). Dutta et al. [9] reported the high 2 3 stability of thermally oxidized aluminide coatings on a superalloy The largest challenge faced during the production of glass is 690 substrate in a borosilicate melt at 1248 K. They attributed this related to the lifetime of the glass-processing equipment, which http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Surface Science Elsevier

Electrochemical characterization of chromia- and alumina-forming nickel-based superalloys in molten silicates

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0169-4332
eISSN
1873-5584
D.O.I.
10.1016/j.apsusc.2015.10.176
Publisher site
See Article on Publisher Site

Abstract

Article history: A comparison of the corrosion behaviour of simplified chromia- and alumina-forming alloys (Ni–30Cr Received 27 May 2015 and Ni–8Al–28Cr) in molten glass is performed via electrochemical methods. A pre-oxidation treatment Received in revised form 9 September 2015 in air prior to immersion ensured the formation of a 2-m-thick oxide scale of Cr O or Al O . The lifetime 2 3 2 3 Accepted 25 October 2015 of Ni–30Cr depended on the competition between the oxide growth and its dissolution in the melt. For Available online 11 November 2015 Ni–8Al–28Cr, the high solubility of alumina in the melt studied here led to severe aluminium loss in a few minutes and clearly demonstrated the higher efficiency of chromia-forming alloys for molten glass Keywords: applications. Molten silicates © 2015 Elsevier B.V. All rights reserved. Superalloys High temperature corrosion Passivity Electrochemical characterization 1. Introduction protective oxide layer (i.e., Al O ). Dutta et al. [9] reported the high 2 3 stability of thermally oxidized aluminide coatings on a superalloy The largest challenge faced during the production of glass is 690 substrate in a borosilicate melt at 1248 K. They attributed this related to the lifetime of the glass-processing equipment, which

Journal

Applied Surface ScienceElsevier

Published: Jan 1, 2016

References

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