LY12CZ铝合金的己二酸硫酸阳极氧化

摘要

通过向硫酸阳极氧化槽液中添加己二酸,研究了LY12CZ铝合金的己二酸硫酸阳极氧化,并与传统硫酸阳极氧化进行了对比.采用场发射扫描电子显微镜（FE-SEM）对两种阳极氧化膜的微观形貌进行了观察,用电化学阻抗谱（EIS）对比研究了两种氧化膜的电化学特性参数及耐腐蚀性能,采用万能力学实验机对阳极氧化后LY12CZ板材试样进行疲劳寿命测试比较.结果表明,与传统硫酸阳极氧化膜相比,己二酸硫酸阳极氧化膜具有更小的孔洞结构和更少的缺陷,在腐蚀环境中有更好的稳定性和耐腐蚀性能,对铝合金试样的疲劳损伤也大大减弱,并对机理进行了初步探讨.%Adipic-sulfuric acid anodic oxidation was improved by adding hexane diacid into sulfur acid anodic bath solutions for LY12CZ aluminum alloy,and compared to conventional sulfur acid anodic oxidation.The morphology of two kinds of oxide films was observed by using filed emission-scanning electron microscope（FE-SEM）.The corrosion resistance and electrochemical character of oxide film were investigated with electrochemical impedance spectroscope（EIS）.Tensile fatigue test of anodic LY12CZ plates was carried out.It is found that adipic-sulfuric acid oxide film has smaller pore structure and fewer defects,and it has better stability and corrosion resistance in corrosive environment.The influence of anodic oxidation on the fatigue properties decreases.The mechanism of adipic-sulfuric acid anodic oxidation was also discussed.