Effect of ultrasonic treatment on microstructure and properties of degradable Zn-0.5Sr alloy
The effects of different ultrasonic power(0,300,600,900 W)on the microstructure and corro-sion properties of Zn-0.5Sr alloy were studied.The results show that the SrZn13 phase in the as-cast Zn-0.5Sr alloy changes from coarse polygon to fine block after ultrasonic treatment.Compared with the un-treated alloy,the electrochemical corrosion rate of the alloy increases from 2.078±0.141 mm/a to 5.747± 0.390 mm/a when the ultrasonic power is 600 W.The immersion corrosion rates of Zn-0.5Sr alloy after 15 and 30 days are 0.090±0.002 1、0.074±0.001 9 mm/a,respectively,which are 1.88 times and 1.95 times higher than that of the untreated alloy.
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