Effect of Li Content on Corrosion Resistance of Lithium Carbonate Coating on Mg-Li Alloys

Abstract:

An eco-friendly and high corrosion-resistant lithium carbonate coating was firstly fabricated on LAZ141 by low temperature plasma. To investigate effect of Li content on structure and properties of as-prepared coating, SEM, EDS, EIS and hydrogen evolution test were adopted for characterization and analysis. The results showed that the content of lithium carbonate in coatings were determined by Li content in alloys. A protective layer with a high ratio of Li₂CO₃ can be formed in the coating when the Li content in alloy reaches the value of 10 wt.%. Hydrogen evolution and EIS results in 0.6 M NaCl solution indicate that the protective layer can improve the resistance of coating over two order of magnitude and reduce the hydrogen evolution rate of substrate at least by 3 times.