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Superhydrophobic coating on magnesium alloy by employing polydopamine@SiO2 (PDA@SiO2) particles and silane via a facile one-step spraying technique was prepared in this study. Surface morphology, chemical compositions, roughness and wettability of the coating were comprehensively investigated by Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared Spectra (FTIR), 3D optical microscope and contact angle techniques, respectively. Corrosion resistance of the coating was evaluated by electrochemical impedance spectroscopy (EIS). Results indicated that the coating exhibited superhydrophobicity due to its micropapillae structure and low surface energy of silica aggregates. The coating showed outstanding superhydrophobicity with contact angle (CA) larger than 154 and sliding angle (SA) less than 3. |Z|0.01Hz of superhydrophobic coated sample reached 6.916 × 10 Ω·cm , which showed excellent corrosion performance. The superhydrophobic coating can protect the specimen surface from being eroded even after fifteen days immersion in NaCl solution, indicating that the coating had a strong stability in corrosive media.

A Facile Strategy for Preparing Superhydrophobic Coating on AZ31 Magnesium Alloy with Stable Anticorrosion Performance