AL5252铝合金阳极氧化及封孔处理后的性能

AL5252铝合金在使用中易遭受腐蚀。先对AL5252铝合金阳极氧化再作封孔处理,对比分析了其封孔前后的表面与截面形貌、膜基结合强度和表面粗糙度等。结果表明:AL5252铝合金阳极氧化后表面形成了形状、大小不规则的多孔型氧化膜,封孔后膜表面呈蜂窝状,生成勃姆石和镍的氢氧化物沉淀并封闭了氧化膜的多孔层,使之具有较好抗腐蚀能力;阳极氧化膜与基体结合强度较高,但封孔后膜基结合强度略微降低,膜表面粗糙度增高。

Performance of AL5252 Aluminum Alloy by Anodic Oxidation and Sealing Treatment

In this work,AL5252 aluminum alloy was treated by anodic oxidation first and then followed by sealing treatment. The section morphology,bonding strength and surface roughness of the oxide film before and after sealing treatment were compared and analyzed. Results showed that after anodization the porous oxide film with irregular shape and size formed on the surface of aviation aluminum. After sealing treatment,the surface of the oxide film was honeycomb-like and boehmite,and nicke hydroxide formed and deposited,sealing the porous layer of the oxide film,and therefore,the oxide film had better corrosion resistance. Moreover,the anodic oxide film-base binding strength was better,however after the sealing treatment it was slightly reduced and meanwhile the surface roughness of the oxide film was increased.