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Effect of copper alloying addition on the electrochemical corrosion behaviour of Fe 3 Al intermetallic in sulphuric acid solution
Author(s) -
Rosalbino F.,
Carlini R.,
Zanicchi G.,
Scavino G.
Publication year - 2016
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201608854
Subject(s) - intermetallic , materials science , corrosion , metallurgy , aluminide , dielectric spectroscopy , copper , electrochemistry , layer (electronics) , alloy , composite material , chemistry , electrode
The effect of Cu alloying addition on the corrosion resistance of iron aluminide Fe 3 Al has been investigated. In this work, the corrosion behaviour of Fe 3 Al‐5Cu (at%) alloys has been assessed by open circuit potential, potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) measurements carried out in a 0.5 M H 2 SO 4 solution, without stirring and in contact with the air. For comparison, the electrochemical tests have also been performed on Fe 3 Al intermetallic. The obtained electrochemical results indicate that iron aluminide Fe 3 Al‐5Cu exhibits superior corrosion resistance as compared to Fe 3 Al. This improvement may be ascribed to the formation of a copper‐enriched surface layer which shows higher protective effectiveness than that formed on Fe 3 Al intermetallic.