Fe^(2+)浓度对2A12铝合金微弧氧化膜性能的影响  

Effects of Fe^(2+) Content on Properties of MAO Films on 2A12 Aluminum Alloys

作　　者：文陈[1] 郝雪龙[2] 崔庆新[1] 白晶莹[1] 张立功[1] 李思振[1] 

机构地区：[1]中国空间技术研究院北京卫星制造厂,北京100094 [2]北京有色金属研究总院国家有色金属及电子材料分析测试中心,北京100088

出　　处：《中国表面工程》2017年第5期67-73,共7页China Surface Engineering

基　　金：国家重点研发计划项目(2017YFB0702100)~~

摘　　要：为分析掺杂元素对微弧氧化膜热控性能的影响,获得更高太阳吸收比和发射率的热控膜层,采用磷酸盐体系、Fe^(2+)盐添加剂制备了微弧氧化(Micro anodic oxidation,MAO)膜,并研究了不同浓度Fe^(2+)盐添加剂对MAO膜层热控性能的影响;采用扫描电镜观察了MAO膜微观结构,结合EDS、XRD,分析了Fe^(2+)浓度对MAO膜层微观形貌、膜层成分、相组成、耐盐雾腐蚀性的影响规律。结果表明:Fe^(2+)进入了膜层,Fe元素含量随着添加剂中Fe^(2+)浓度升高而增加,太阳吸收比和发射率均先升后降,且在Fe^(2+)浓度为20 g/L时出现峰值0.89和0.83;掺杂Fe^(2+)进入膜层生成Fe3O4,显著提高了MAO膜的热控性能和耐盐雾性能;Fe^(2+)浓度在20 g/L时微弧氧化膜具有优异的热控性能(其太阳吸收比达αS0.89、发射率达εH0.83)和耐盐雾腐蚀性能。In order to obtain a high absorption and high emission thermal control film by making out the effect of doping element on thermal control properties, the micro-arc oxidation （MAO） film was prepared by using a phosphate system and Fe2＋ salt additive. The effects of different concentrations of Fe2＋ salt additive on the thermal control performance of MAO film was studied. The effects of Fe2＋ concentration on the microstructure, membrane composition and salt spray corrosion resistance of MAO were investigated by XRD and EDS, respectively. The results show that Fe2＋ enters into the film, and its content increases with the increase of Fe2＋ concentration in the additive.The solar absorption ratio and emissivity firstly increase and then descend, and the peak appears at the Fe2＋ concentration of 20 g/L, with the values of 0.89 and 0.83, respectively. The addition of Fe2＋ leads to form Fe304, which significantly increases the salt spray resistance time and thermal control property. When the concentration of Fe2＋ is 20 g/L, 2A12 micro-arc oxidation film has the best thermal control properties （as is 0.89 and eH is 0.83） and corrosion resistance.

关 键 词：微弧氧化 Fe2+浓度 热控性能 盐雾腐蚀 

分 类 号：TG174.44[金属学及工艺—金属表面处理]