【摘 要】
：
2198 and 5A90 Al-Li alloys were anodized with a constant DC potential in 18％H2SO4 solution (Solu.A) and the mixture solution of 18％H2SO4+5％C2H2O4 (Solu.B) at room temperature.12 and 11 V was optimized as the applied oxidation potential for 2198 and 5A90 a
【机 构】
：
Institute of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110316, Chin
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
2198 and 5A90 Al-Li alloys were anodized with a constant DC potential in 18％H2SO4 solution (Solu.A) and the mixture solution of 18％H2SO4+5％C2H2O4 (Solu.B) at room temperature.12 and 11 V was optimized as the applied oxidation potential for 2198 and 5A90 alloys,respectively.Cross-sectional morphology,surface morphology and elements distribution of anodic oxidation coatings were observed by scanning electron microscope equipped with energy dispersive X-ray analysis (SEM/EDX).Corrosion resistance was tested by potentiodynamic polarization plot in 3.5％NaCl solution.The results showed that the thicknesses of coatings obtained at the selected potential in Solu.A and Solu.B were about 50 μm/110 μ m for 2198 alloy and 80 μm/110 μm for 5A90 alloy.In both solutions,anodic oxidation coatings of 2198 alloy were primarily composed of A1 oxides;those of 5A90 alloy were mainly consisted of Al oxides and a small amount of Mg oxides.The results of potentiodynamic polarization showed that anodic oxidation coatings of 2198 and 5A90 Al-Li alloys had better corrosion resistances than that of untreated alloys.
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