电化学刻蚀及类金刚石薄膜对2024铝合金疏水性能影响  

Influence of electrochemical etching and diamond-like carbon film on hydrophobicity of 2024 aluminum alloy

作　　者：史含放 刘家维 朱天元 霍婧雅 陈东旭[1] 王亚男[1] SHI Hanfang;LIU Jiawei;ZHU Tianyuan;HUO Jingya;CHEN Dongxu;WANG Ya’nan(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《辽宁科技大学学报》2021年第4期253-257,共5页Journal of University of Science and Technology Liaoning

基　　金：辽宁科技大学校人才计划(2018RC03);辽宁科技大学大学生创新创业训练计划。

摘　　要：材料表面的疏水性决定了其耐蚀及防污性能。采用电化学刻蚀技术在2024铝合金表面制备具有微-纳米尺寸的粗糙结构,再利用等离子体增强化学气相沉积技术在其表面制备类金刚石薄膜,采用半球法计算刻蚀及镀膜后的接触角,利用扫描电镜观察刻蚀后的表面形貌,研究刻蚀电流密度及刻蚀时间对薄膜疏水性能的影响机制。结果表明,电化学刻蚀能够明显改善2024铝合金的表面疏水性。本实验范围内,刻蚀时间为100 s且电流密度为2.6 A/cm^(2)时,试样表面微/纳浮突结构相对均匀,疏水性能较高;镀DLC膜后,表面自由能为32.32 mN/m,仅为基体的一半;低自由能进一步提高铝合金表面疏水性能。The hydrophobicity of a material surface determines its corrosion resistance and antifouling performance.In this paper,electrochemical etching is used to prepare rough micro-nano structure on the surface of a 2024 aluminum alloy,then plasma enhanced chemical vapor deposition is used to coat a diamond-like carbon film on the etched surface,and the hemisphere method is used to calculate contact angles of the etched and coated surfaces.The surface morphology after etching is observed using scanning electron microscope to study the mechanism of the influence of etching current density and etching time on the hydrophobic properties of the film.The results show that the electrochemical etching can significantly improve the hydrophobicity of the alloy.Within the scope of the experiments,when the etching time is 100 s and the current density is 2.6 A/cm^(2),the micro/nano embossed structure of the surface is relatively uniform,which results in a better hydrophobic performance.The surface free energy after coating the DLC film is 32.32 mN/m,which is only half of the matrix.The low free energy can further improve the surface hydrophobicity of the alloy.

关 键 词：电化学刻蚀 类金刚石薄膜 接触角 表面自由能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]