钱晨,王华.2024铝合金超疏水表面的制备及其耐蚀性能[J].表面技术,2019,48(10):238-243.
QIAN Chen,WANG Hua.Preparation and Corrosion Resistance of Superhydrophobic Surface on 2024 Aluminium Alloy[J].Surface Technology,2019,48(10):238-243
2024铝合金超疏水表面的制备及其耐蚀性能
Preparation and Corrosion Resistance of Superhydrophobic Surface on 2024 Aluminium Alloy
投稿时间:2019-01-23  修订日期:2019-10-20
DOI:10.16490/j.cnki.issn.1001-3660.2019.10.029
中文关键词:  铝合金  超疏水表面  阳极氧化  月桂酸  电化学阻抗  耐腐蚀
英文关键词:aluminum alloy  super-hydrophobic surface  anodic oxidation  lauric acid  electrochemical impedance spectroscopy  corrosion resistance
基金项目:国家自然科学基金(51101025)
作者单位
钱晨 大连理工大学 化工学院,辽宁 大连 116024 
王华 大连理工大学 化工学院,辽宁 大连 116024 
AuthorInstitution
QIAN Chen School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China 
WANG Hua School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China 
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中文摘要:
      目的 在2024铝合金基体上制备超疏水表面,从而提高自清洁性能和耐腐蚀性能。方法 采用硫酸和草酸钛钾混合电解液阳极氧化,用月桂酸乙醇溶液修饰,在铝合金基体上制备超疏水表面,用扫描电子显微镜(SEM)、红外光谱和光学接触角测量仪观察、分析超疏水表面形貌、化学结构和润湿性,用电化学交流阻抗和极化曲线测试研究超疏水表面在3.5%氯化钠中的耐蚀性。结果 20 V恒电位阳极氧化时间小于90 min时,随着时间的增加,接触角增大。铝合金在0.5 mol/L硫酸和0.01 mol/L草酸钛钾混合电解液中阳极氧化90 min,并在5%(质量分数)的月桂酸乙醇溶液中修饰1.5 h,能制备出最优的超疏水表面,接触角为157.99°。在3.5%氯化钠中浸泡14天后,超疏水铝的交流阻抗值高于空白铝4个数量级,Tafel极化曲线解析表明,保护效率为99.92%。结论 在低浓度硫酸中对铝阳极氧化,并用月桂酸修饰能够成功制备出超疏水表面。所得表面展现出良好的耐腐蚀性,并且耐孔蚀性能得到改善。
英文摘要:
      The work aims to prepare superhydrophobic surfaces on 2024 aluminum alloy substrate and then improve self-cleaning ability and corrosion resistance. The superhydrophobic surfaces were prepared on the aluminum alloy through anodic oxidation by mixed sulfuric acid and titanium potassium oxalate and modification by lauric acid ethanol solution. Surface morphology, chemical structure and wettability of super hydrophobic surface were observed and analyzed by scanning electron microscope (SEM), infrared spectroscopy and optical contact angle measuring instrument and the corrosion resistance in 3.5% sodium chloride was studied by electrochemical impedance spectroscopy and polarization curve test. When the anodic oxidation time was less than 90 min at 20 V constant potential, the contact angle increased with the increase of the time. The optimal super hydrophobic surface could be got when aluminum alloy was anodized in 0.5 mol/L sulfuric acid and 0.01 mol/L titanium potassium mixed electrolyte for 90 min, and modified by the lauric acid ethanol solution with mass fraction of 5% for 1.5 h, and the contact angle was 157.99°. The impedance modulus of superhydrophobic aluminum was 4 orders of magnitude higher than that of blank aluminum immersed in 3.5wt% sodium chloride for 14 d and the Tafel polarization showed that the protection efficiency was 99.92%. Superhydrophobic surface can be successfully prepared by oxidizing the aluminum anode in low concentration sulfuric acid and making modification with lauric acid. The obtained surfaces exhibit good corrosion and the hole corrosion resistance is improved.
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