| WANG Jiu-hua,ZHENG Da-jiang,SONG Guang-Ling.Preparation and Corrosion Resistance of Superhydrophobic Composite Coating on Steel Surface[J],47(10):165-171 |
| Preparation and Corrosion Resistance of Superhydrophobic Composite Coating on Steel Surface |
| Received:July 08, 2018 Revised:October 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.10.022 |
| KeyWord:superhydrophobicity micro/nanostructure two-step method electrodeposition sacrificial anode corrosion |
| Author | Institution |
| WANG Jiu-hua |
College of Materials, Xiamen University, Xiamen , China |
| ZHENG Da-jiang |
College of Materials, Xiamen University, Xiamen , China |
| SONG Guang-Ling |
College of Materials, Xiamen University, Xiamen , China |
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| Abstract: |
| The work aims topreparesuperhydrophobic composite coating on steel surface andimprove its corrosion resistance. The two-step method was used to put the 45# steel sheet in a simple galvanized solution (40 g/L ZnCl2, 200 g/L KCl and 20 g/L HBO3) for direct current electrodeposition. The electrodeposition time and current density were adjusted to obtain zinc coatings with certain structural difference on the surface of the steel sheet. Then the composite coating was obtained by the stearic acid of 0.05 mol/L through modification. The water contact angle of the coating was tested. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) were employed to investigate the morphology and chemical composition of the coating. The corrosion resistance of the coating was evaluated by testing the polarization curve. The water contact angle of the surface of 45# steel increased first and then decreasedwith the extension of electrodeposition time and increase of current density. When the current density was 6 A/dm2 and the electrodeposition time was 20 min, the micro/nano structure galvanized layer on the steel sheet was successfully obtained. The average particle size was < 20 μm, the thickness of the coating was 40~50 μm. The hydrophobic coating obtained after modification hadthe water contact angle of 155.4 degrees, and the self-corrosion current density of the composite coating wasreduced by an order of magnitude. The zinc coating with micro/nano roughness structure can be prepared in a simple galvanized solution by adjusting the electrodeposition time and current density. The composite coating with super hydrophobic properties is obtained after modification. The composite coating has both sacrificial anode and superhydrophobic properties and can effectively improve the corrosion resistance of the coating and protect the steel. |
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