Effect of YAl(2) Particles on the Corrosion Behavior of Mg–Li Matrix Composite in NaCl Solution

The strength of Mg–Li alloy is greatly improved by the composite strengthening of intermetallic compound YAl(2) particles, but the low corrosion resistance of Mg–Li alloy is still the main factor that restricts the application of the alloy and its composites. In this paper, the effect of YAl(2) particles on the corrosion behavior of Mg–Li alloy was systematically investigated. The results showed that the corrosion resistance of YAl(2p)/LA143 composite could be significantly improved, accounting for the formation of a transitional interface layer by adding YAl(2) particles. The diffusion of yttrium and aluminum atoms from YAl(2) particulates improved the stability of the surface film and enhanced the adhesion between the corrosion products and the substrate, which hindered further expansion of pitting.