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Effects of substituting ytterbium for scandium on corrosion behaviour of Al–Sc alloy
Author(s) -
Tuan N. Q.,
Alves A. C.,
Toptan F.,
Lopes A. B.,
Pinto A. M. P.
Publication year - 2015
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.201508360
Subject(s) - scandium , materials science , alloy , corrosion , passivation , intermetallic , ytterbium , metallurgy , impurity , polarization (electrochemistry) , electrochemistry , pitting corrosion , composite material , electrode , chemistry , doping , optoelectronics , organic chemistry , layer (electronics)
The localized corrosion and electrochemical behaviour of Al–0.28 wt.% Sc and Al–0.24 wt.% Sc–0.07 wt.% Yb alloys have been studied in 3.5 wt.% NaCl solution. The results showed that the impurity intermetallic phases containing Fe can act as cathodes and promote localized corrosion in the surrounding matrix. Yb had strong effect on the polarization behaviour in the anodic domain of Al–Sc alloy by improving the pitting corrosion resistance of this alloy. It has been deduced that a high number density of fully coherent nano‐sized Al 3 Sc or Al 3 (Sc,Yb) precipitates in heat treated alloys can enhance the passivation tendency of these alloys.