| QIAN Chen,WANG Hua.Superhydrophobic Surface Prepared by Stearic Acid Modification of Ni-TiO2 Coating on Carbon Steel Surface[J],48(8):165-171 |
| Superhydrophobic Surface Prepared by Stearic Acid Modification of Ni-TiO2 Coating on Carbon Steel Surface |
| Received:November 23, 2018 Revised:August 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.022 |
| KeyWord:electroplate Ni-TiO2 composite coating superhydrophobic stearic acid self-cleaning anticorrosion 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 coating and improve seawater corrosion resistance of carbon steel. Superhydrophobic Ni-TiO2 composite coating was prepared on carbon steel by constant current electrodeposition and stearic acid modification. Morphology, composition and crystal structure of the prepared coating were analyzed with scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Fourier-transform infrared spectrometer (FTIR) and X-ray diffractometer (XRD). Surface wettability and self-cleaning were evaluated by contact angle meter and self-cleaning test. Corrosion resistance of samples was evaluated by measuring the electrochemical impedance spectroscopy and polarization curve with electrochemical workstation. The fabricated superhydrophobic Ni-TiO2 composite coating had a spherical micro-nano roughness structure. After modification with stearic acid, the water contact angle was as high as 160.99°, which exhibited excellent superhydrophobicity and self-cleaning performance. The self-corrosion current density of the prepared superhydrophobic Ni-TiO2 composite coating in 3.5% NaCl was 2.42×10-8 A/cm2, the corrosion rate was 2.84×10-4 mm/a and the corrosion inhibition efficiency was 99.41%, which showed excellent corrosion protection effect. Furthermore, after immersion in 3.5% NaCl solution for 60 days, the charge transfer resistance Rct of the superhydrophobic Ni-TiO2 composite coating changed little without damage and had long-term corrosion resistance. The superhydrophobic Ni-TiO2 composite coating is successfully prepared on carbon steel by constant current electrodeposition and stearic acid modification, which effectively improves the corrosion resistance of carbon steel to seawater for a long time. |
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