Corrosion Behavior of As-Cast Binary Mg-Dy Alloys
AbstractThe addition of rare earth elements (REE) is an effective way to improve the corrosion properties of magnesium alloys. Dysprosium has a very high solubility in Mg (25.3 wt.% at 561 °C) and could therefore be a promising alloying element for Mg based implants. In this study, four
binary Mg-xDy (x=5, 10, 15 and 20 in wt.%) alloys were prepared by permanent mould direct chill
casting. Microstructure and Dy distribution were investigated using optical microscope and EDX
analysis. Corrosion rate was measured with hydrogen evolution method and corrosion morphology
was observed after immersion for different time in 0.9 wt% NaCl solution with optical and SEM.
The results show that with the increase of Dy, the amount of Dy in Mg matrix and area of Dy
segregation are both increased. At the same time, the amount of second phase is also increased.
Filiform corrosion is reduced while pitting corrosion is increased with the increment of Dy. As a
result, lowest corrosion rate is obtained at Mg-10Dy alloy.