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High Temperature Corrosion of Spray-Atomized FeAl (40at.%) Based Alloys:Immersed in a Molten Salt Mixture of V2O5-Na2SO4

Published online by Cambridge University Press:  10 February 2011

M. Amaya ,
E. J. Lavernia  and
L. Martinez
M. Amaya
Affiliation:
Centro de Ciencias Fisicas, UNAM, A.P. 48–3, 62251, Cuernavaca, Morelos, Mexico
E. J. Lavernia
Affiliation:
Chemical and Biochemical Engineering and Materials Science Department, University of California, Irvine, CA 92697–2575, USA
L. Martinez
Affiliation:
Centro de Ciencias Fisicas, UNAM, A.P. 48–3, 62251, Cuernavaca, Morelos, Mexico
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Abstract

We studied the high temperature corrosion of spray atomized and deposited FeAl40at% based intermetallic alloys immersed in a molten salt mixture of 80%V2O 5+20%Na2SO4 (wt%) over the temperature range of 600–900°C. Experiments were realized by the weight loss method and the potentiodynamic polarization electrochemical technique in three different samples: FeA140at%, FeA140+0.lat%B and FeA140+0.lat%B+10at%A12O3. Measurements of weight loss and corrosion current density as a function of the molten salts temperature were obtained and discussed in terms of the passive layer morphology and corrosion products formed during the tests. It was found that the iron aluminide doped with boron and reinforced with alumina particulate was more corrosion resistant in the test temperature range. The weight loss experiments revealed that at 700°C all alloys developed maximum corrosion rate. This behavior was related with the dissolution of protective oxide layer on metal base due the formation of vanadate phases which are highly corrosive at this temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK4.9.1
Copyright
Copyright © Materials Research Society 1999

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