Abstract
The fabricated Mg-Al alloy consists of α-Mg phase and Mg-Mg(17)Al(12) eutectic phase. The corrosion behavior of cast Mg-Al alloy in sulphuric acid (H(2)SO(4)) and acetic acid (HAc) aqueous solutions was investigated. The Mg-Al alloy shows general corrosion in H(2)SO(4) solution, and the α-Mg dendrites revealed a slightly faster corrosion rate than that of the eutectics. In HAc solution, the alloy shows an obvious selective corrosion characteristic, with the α-Mg dendrites being corroded preferentially. Grain orientation plays an important role in corrosion behavior of the alloy in the HAc solutions.