Abstract
The microstructure and corrosion behavior of Mg-8Li-3Al-2Zn(−1.0Gd) alloys were investigated. In as-homogenized LAZ832(−1.0Gd) alloys, galvanic corrosion occurs at α-Mg/β-Li phase interface, and pitting corrosion occurs in α-Mg matrix and β-Li matrix. After hot extrusion, the corrosion form of α-Mg matrix changes to intergranular corrosion. The corrosion resistance of LAZ832 alloy is effectively improved by combining Gd alloying and hot extrusion, and as-extruded LAZ832–1.0Gd alloy exhibits the best corrosion resistance with a corrosion rate of 0.64 mm·y−1. Gd alloying improves corrosion resistance mainly due to the formation of Al2Gd phase, the reduction of AlLi phase, and the formation of oxide film containing Gd2O3. Hot extrusion improves corrosion resistance mainly attributed to the increase in the share of basal orientation and the crushing of fibrous AlLi phase.
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