Corrosion Behavior Characterization Of As Extruded Mg-8li-3al Alloy With Minor Alloying Elements (Gd, Sn And Cu) By Scanning Kelvin Probe Force Microscopy

The effects of Gd, Sn and Cu on the corrosion behavior of as extruded Mg-8Li-3Al (LA83) alloy were characterized by scanning Kelvin probe force microscopy, weight loss, hydrogen evolution, and electrochemical measurements. Result revealed that many Al2Gd, Mg2Sn, and AlCuMg particles were discovered in modified alloys, respectively. The combined experimental results of weight loss, hydrogen evolution, and electrochemical analysis indicated that the addition of Gd and Sn improve the corrosion resistance of as extruded LA83 alloy while the addition of Cu weaken its corrosion resistance. The corrosion mechanisms of different elements in as extruded samples were discussed.