3种溶液体系下铝合金阳极氧化膜的性能

通过表面形貌观察、升压曲线测试、电化学阻抗谱(EIS)测试和疲劳性能测试等研究LY12铝合金铬酸阳极氧化(CAA)、硼酸硫酸阳极氧化(BSAA)和己二酸硫酸阳极氧化(ASAA)膜的性能。结果表明:CAA膜和ASAA膜缺陷较少且缺陷边缘光滑,BSAA膜缺陷数目较多且边缘较为粗糙。3种氧化膜的耐蚀性良好,在5%NaCl(质量分数)溶液中浸泡80 d后,均未出现明显的破坏。对比氧化膜的壁垒层阻抗(Rb)发现,BSAA的Rb值下降最大,约为94%,CAA和ASAA优于前者,其阻抗分别下降了75%和78%。3种阳极氧化技术对基体疲劳性能的影响结果表明,CAA处理降低基体的疲劳寿命值最小,约为14%;ASAA次之,约为20%;BSAA对基本疲劳性能的影响最大,约25%。

Properties of aluminum alloy anodic films formed in three kinds of solutions

The properties of anodic films formed in chromic,boric-sulfuric and adipic-sulfuric acid(CAA,BSAA and ASAA,respectively) on LY12 aluminum alloy were studied by morphology characterization,current—voltage response test,electrochemical impedance spectroscopy(EIS) and fatigue test methods.It is indicated that in contrast with BSAA film,CAA and ASAA films have less defects and a smoother periphery.All of three kinds of anodic films have perfect corrosion resistant after immersed in 5% NaCl solution for 80 d.The resistance value(Rb) of the barrier layers of BSAA decreases in greatest,while the Rb values of CAA and ASAA decrease by 75% and 78%,respectively.From fatigue test results,it is confirmed that CAA reduces the fatigue life of the matrix at a little,about 14%,ASAA,about 20%,and BSAA about 25%,indicating that BSAA has the greatest impact on the fatigue life of the matrix among the three treatments.