氧化时间对7A04铝合金微弧氧化膜层组织与性能的影响  

Effects of Oxidation Time on Microstructure and Properties of Microarc Oxide Film of 7A04Aluminum Alloy

作　　者：杨晓禹 张立君[1] 杨晓杰 刘凯[1] 朱礼德 谭锁奎[1] Yang Xiaoyu;Zhang Lijun;Yang Xiaojie;Liu Kai;Zhu Lide;Tan Suokui(Ningbo Branch of Chinese Academy of Ordance Science;Shandong Nuclear Power Equipment Manufacturing Co.,Ltd.)

机构地区：[1]中国兵器科学研究院宁波分院 [2]山东核电设备制造有限公司

出　　处：《特种铸造及有色合金》2023年第10期1390-1394,共5页Special Casting & Nonferrous Alloys

基　　金：宁波市江北区关键核心技术攻关资助项目(202201A09);宁波市自然科学基金资助项目(202003N4339)。

摘　　要：在硅酸盐与铝酸盐混合电解液体系下,在7A04铝合金表面制备了微弧氧化陶瓷膜层,通过对膜层的厚度均匀性、电化学特性、物相组成以及表面形貌进行分析,研究了氧化时间对陶瓷膜层厚度、电化学耐蚀性、物相组成与表面形貌的影响。结果表明,膜层微观表面凹凸不平,呈火山喷口状形貌,微弧氧化时间不会改变膜层物相种类,主要由γ-Al_(2)O_(3)和α-Al_(2)O_(3)组成;微弧氧化时间是决定微弧氧化膜层性能的关键因素,氧化时间为25min时,膜层厚度均匀性最好,方差为0.69,腐蚀电位为-0.4821V,腐蚀电流密度为3.75×10^(-7) A/cm^(2),极化电阻为4.63×10^(6)Ω·cm^(2);氧化时间为35min时,交流阻抗性能最好。The micro-arc oxidation ceramic film was prepared on the surface of 7A04aluminum alloy in the mixed electrolytic liquid system of silicate and aluminate.The effects of oxidation time on thickness,electrochemical characteristics,phase composition and surface morphology of the film were investigated.The results indicate that the micro-surface of film is uneven and presents volcanic spout.The phase type is hardly changed by micro-arc oxidation time,which is mainly composed ofγ-Al_(2)O_(3)andα-Al_(2)O_(3).Microarc oxidation time is a key factor determining the properties of microarc oxidation films.When the oxidation time is 25min,the optimal variance of thickness uniformity,maximum corrosion potential,minimum corrosion current and the maximum polarization resistance are 0.69,-0.4821V,3.75×10^(7) A/cm^(2),and 4.63×10^(6)Ω·cm^(2),respectively.When the oxidation time is 35min,the AC impedance performance is desirable.

关 键 词：氧化时间 铝合金 微弧氧化 均匀性 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG214.6[金属学及工艺—金属材料]