Monophasic AlsoNiso ribbons were fabricated by melt spinning at circumferential speeds(Sc)of 21 and 42 m/s,and subsequently annealed at various temperatures.The microstructure and corrosion behavior of ribbons were studied through various experimental methods.With increasing Sc,the as-spun and annealed ribbons at 42 m/s show a higher(100)crystal orientation factor F(100),a lower barrier to recrystallization and a higher total film resistance than the counterparts with 21 m/s.The as-spun ribbon at 42 m/s demonstrated a denser and more stable Al2O3 passive film compared to the as-spun and annealed ribbons at 21 m/s.This improvement in passive film can be further enhanced by 700 ℃ annealing.Therefore,the corrosion resistance of AlNi ribbons can be improved by increasing Sc and additional annealing at an appropriate temperature.
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