铝合金表面亲水膜的制备及性能研究  

Preparation and Properties of Hydrophilic Film on Aluminum Alloy Surface

作　　者：李康聪 倪展鹏 陈思安 卫国英[1] 杨雨萌 周文涛 朱本峰 伏利 LI Kang-cong;NI Zhan-peng;CHEN Si-an;WEI Guo-ying;YANG Yu-meng;ZHOU Wen-tao;ZHU Ben-feng;FU Li(School of Materials and Chemistry,China University of Metrology,Hangzhou 310018,China;Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology of Zhejiang Province,Hangzhou 310012,China)

机构地区：[1]中国计量大学材料与化学学院,浙江杭州310018 [2]浙江省水利水电装备表面工程技术研究重点实验室,浙江杭州310012

出　　处：《材料保护》2022年第12期112-117,共6页Materials Protection

基　　金：国家自然科学基金项目(51471156、52001300);浙江省新苗计划(2018R409014);浙江省水利水电装备表面工程技术研究重点实验室开放课题(2021SLKL007)资助。

摘　　要：为增强铝合金表面的亲水性和防腐蚀性能,在2024和60612种铝合金基体上通过阳极氧化、扩孔和氟硅酸钠表面覆膜的方法得到亲水表面,并分析其表面形貌、元素组成、润湿性及电化学性能。结果表明:使用15%(质量分数)的硫酸溶液阳极氧化后,2024铝合金和6061铝合金的氧化膜分别表现为粗糙的纳米颗粒状和分散的微孔状,2024铝合金生成的氧化膜能更好的与氟硅酸钠结合,生成亲水效果好的表面膜。将2种铝合金在氟硅酸钠溶液中覆膜,得到接触角均小于30°的亲水膜,其中2024铝合金表面平均接触角为18.5°,2种铝合金均获得不错的亲水性。电化学测试表明,覆膜后的2024和6061铝合金的防腐蚀性能有所下降,其中6061铝合金变化最为明显,2024铝合金覆膜后的亲水性和防腐蚀性能相对优于6061铝合金。In order to enhance the hydrophilicity and corrosion resistance of aluminum alloy surface,a hydrophilic surface was obtained on 2024 and 6061 aluminum alloy substrates by anodic oxidation,reaming and coating of sodium fluosilicate,and the surface morphology,elemental composition,wettability and electrochemical properties of the as-prepared hydrophilic surface were analyzed.Results showed that after anodizing with 15%(mass fraction)sulfuric acid solution,the oxide films of 2024 aluminum alloy and 6061 aluminum alloy presented the rough nano-particles and dispersed micropores respectively.And the oxide film of 2024 aluminum alloy could better combine with sodium fluorosilicate to form a surface film with good hydrophilic effect.These two kinds of aluminum alloys were coated in sodium fluorosilicate solution,and hydrophilic films with contact angles less than 30°were obtained.The average contact angle of 2024 aluminum alloy surface was 18.5°and both aluminum alloys obtained good hydrophilicity.The electrochemical test results showed that the corrosion resistance of 2024 and 6061 aluminum alloys both decreased after coating,and the corrosion resistance of 6061 aluminum alloy changed more obviously.In all,the hydrophilicity and corrosion resistance of 2024 aluminum alloy were better than those of 6061 aluminum alloy after coating.

关 键 词：铝合金 阳极氧化 亲水膜 氟硅酸钠 

分 类 号：TG178[金属学及工艺—金属表面处理]