| QIAN Chen,WANG Hua.Preparation and Corrosion Resistance of Superhydrophobic Surface on 2024 Aluminium Alloy[J],48(10):238-243 |
| Preparation and Corrosion Resistance of Superhydrophobic Surface on 2024 Aluminium Alloy |
| Received:January 23, 2019 Revised:October 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.10.029 |
| KeyWord:aluminum alloy super-hydrophobic surface anodic oxidation lauric acid electrochemical impedance spectroscopy corrosion resistance |
| Author | Institution |
| QIAN Chen |
School of Chemical Engineering, Dalian University of Technology, Dalian , China |
| WANG Hua |
School of Chemical Engineering, Dalian University of Technology, Dalian , China |
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| Abstract: |
| 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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