Superhydrophobic Silane/Fluorinated Attapulgite@SiO2 Composite Coatings on Magnesium Alloy for Corrosion Protection

摘要

To improve the corrosion resistance of magnesium alloys, superhydrophobic coatings were prepared by employing fluorinated attapulgite@SiO2 (F-ATP@SiO2) particles and silanes via a facile one-step spraying technique in this study. Surface morphology, chemical compositions, roughness and wettability of the coatings were comprehensively investigated by Field emission scanning electron microscopy (FESEM), Fourier trans-form infrared spectra (FTIR), 3D optical microscope and contact angle techniques, respectively. Corrosion resistance of the coatings was evaluated by potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS). Results indicated that the coatings exhibited superhydrophobicity due to its micron scale mastoid structure and low surface energy of F-ATP@SiO2 particles. The superhydrophobicity and anticorro-sion performance of the coatings increased with the dosage increase of F-ATP@SiO2 particles. The water contact angle of the prepared surface can reach as high as 161° with sliding angle of 4°. Icorr of the coatings can reach 5.519×10