Relationship between extrusion, Y and corrosion behavior of Mg–Y alloy in NaCl aqueous solution

The effect of hot extrusion and addition of Y element on the corrosion behavior of Mg–Y alloy was investigated by weight loss, immersion tests and potentiodynamic polarization measurements. The results showed that the grains became finer and uniform by increasing Y element, after extrusion. The corrosion resistance of Mg–Y alloy after extrusion was deteriorated with the addition of Y element and corrosion rates decreased in the following order: Mg–13.78Y > Mg–7.46Y > Mg–5.23Y.The corrosion rate of the transversal facet was firstly nobler and then became worse than that of longitude section by increasing immersion time. The corrosion rate increased by extending immersion time, and then the corrosion rate tended to be smooth in the last stage.