脉冲阳极氧化工艺对7050铝合金阳极氧化膜耐热冲击性能的影响  

Influence of pulse anodizing process on the thermal shock resistance of anodic oxide film of 7050 aluminum alloy

作　　者：于娟 荣刚 于美[2] 冯朝辉 王任 罗开军 YU Juan;RONG Gang;YU Mei;FENG Zhao-hui;WANG Ren;LUO Kai-jun(Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空材料研究院,北京市先进铝合金材料及应用工程技术研究中心,北京100095 [2]北京航空航天大学,材料科学与工程学院,北京100191

出　　处：《轻合金加工技术》2020年第12期46-52,共7页Light Alloy Fabrication Technology

摘　　要：采用脉冲电源对7050铝合金进行阳极氧化,研究了脉冲电压、占空比以及脉冲频率对阳极氧化膜厚度、形貌以及耐热冲击性能的影响。研究结果表明:氧化膜厚度随着脉冲电压和占空比的增加而增大,且热冲击后氧化膜表面的裂纹宽度也随脉冲电压和占空比的增加而增大,耐热冲击性能变差;氧化膜厚度和热冲击后的裂纹宽度都是随着频率的增加先增加后减小,当脉冲频率为25 Hz时,膜层厚度最大,热冲击后的阳极氧化膜表面的裂纹宽度也是最大,耐热冲击性能最差。After anodizing 7050 aluminum alloy by pulse power supply, the influence of pulse voltage, duty cycle and pulse frequency on the thickness, micrography and thermal shock resistance of anodic oxide film was studied. The research results show that film thickness increases with the increase of pulse voltage and duty cycle, and the width of cracks increases as pulse voltage and duty cycle increase after thermal shock, indicating that the thermal shock resistance of oxide film of 7050 aluminum alloy gets worse. The thickness of oxide film and the width of cracks after thermal shock increase firstly and then decrease with the increasing frequency. When pulse frequency is 25 Hz, both of them are largest, indicating that thermal shock resistance of oxide film of 7050 aluminum alloy is worst.

关 键 词：7075铝合金 脉冲阳极氧化 耐热冲击性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]