Effect of Au Addition on Intermetallics Precipitation Tendency and Repassivation of Al88Fe5Y7 Glassy Alloy

P J. Yin
2017 International Journal of Electrochemical Science  
The effects of Au addition and annealing on selective intermetallics precipitation and corrosion behaviors of the as-spun Al 88-x Fe 5 Y 7 Au x (x = 0, 0.5 and 1) alloys have been investigated. When Au content x = 0, the alloy has more preferentially precipitated AlY phase, the larger E (= E p -E prot , E p and E prot are piting and protective potentials) in Tafel curve, and the higher steepness k s (= dE/dlog(I)) on the reverse scan, suggesting that there exist some tunnels in the pit
more » ... s and the repassivation can be hindered; whereas in case of x = 0.5 and 1, the AlFe phase precipitates more easily, and the E and k s of the alloys are lower obviously. The repassivation and pitting transition of Al 88-x Fe 5 Y 7 Au x (x = 0, 0.5 and 1) glassy alloys are closely associated with the intermetallics precipitation tendency and fraction of amorphous phase.
doi:10.20964/2017.02.15 fatcat:waycietplnfqxogyt2ev4q4spm