6061铝合金酒石酸-硫酸阳极氧化工艺研究  

Study of Anodic Oxidation Process of 6061 Aluminum Alloy with Tartaric Acid and Sulfuric Acid

作　　者：刘君 龚利华[1] 潘峰 夏壮 LIU Jun;GONG Li-hua;PAN Feng;XIA Zhuang(College of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212000,China)

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212000

出　　处：《材料保护》2021年第3期94-99,108,共7页Materials Protection

摘　　要：为了改善铝合金的耐蚀性,基于L_(16)(4^(5))正交试验,对6061铝合金酒石酸-硫酸阳极氧化工艺进行了优选。通过极差、方差分析,结合氧化膜表面形貌观察、厚度测试以及电化学阻抗分析,得出了耐蚀性最优工艺参数,并以此为基础,进一步研究了封孔对耐蚀性的影响。结果表明:以耐蚀性为指标,最优工艺参数为氧化温度20~25℃、氧化时间50 min、氧化电压20 V、酒石酸浓度80 g/L,在该条件下,氧化膜厚度为10μm,阻抗值为4.148×10^(7)Ω·cm^(2)。沸水封孔后,氧化膜中频处的阻抗值从1×(10^(3)~10^(4))Ω·cm^(2)提高到1×(10^(4)~10^(5))Ω·cm^(2)左右。试验发现氧化膜厚度与耐蚀性之间没有相关性,影响耐蚀性的关键因素是氧化时间和酒石酸浓度。沸水封孔处理有效提高了氧化膜的耐蚀性。In order to improve the corrosion resistance of aluminum alloy,the anodic oxidation process of 6061 aluminum alloy with tartaric acid and sulfuric acid was optimized via orthogonal test of L_(16)(4^(5)).Through range analysis and variance analysis,combined with oxidation film surface morphology observation,thickness test and electrochemical impedance analysis,the optimal process parameters of corrosion resistance were obtained.On the basis of the above,the effect of hole sealing on corrosion resistance was further studied.Results showed that with taking corrosion resistance as the index,the optimal process parameters were oxidation temperature of 20~25℃,oxidation time of 50 min,oxidation voltage of 20 V,tartaric acid concentration of 80 g/L.The oxidation film prepared under the optimal parameters possessed the thickness of 10μm and the impedance value of 4.148×10^(7)Ω·cm^(2).After sealing the hole of oxide film with boiling water,the impedance value of the intermediate frequency place of the oxidation film was improved from 1×(10^(3)~10^(4))Ω·cm^(2) to 1×(10^(4)~10^(5))Ω·cm^(2).From the experiments,it could be found that there was no correlation between oxidation film thickness and corrosion resistance,and the key factors affecting corrosion resistance is oxidation time and tartaric acid concentration.Besides,Boiling water sealing treatment effectively improved the corrosion resistance of the oxide film.

关 键 词：铝合金 阳极氧化 正交试验 沸水封孔 耐蚀性 

分 类 号：TG174.451[金属学及工艺—金属表面处理]