Fabrication of a Hydrophilic Al ₂ O ₃ /AlN EP Coating with Self‐Cleaning and High‐Efficiency Anti‐Corrosion Properties

Abstract Currently, with the gradual development of anticorrosive coatings, the pursuit of simple preparation methods and the improvement of anticorrosive coatings’ properties have become the major research trends. This study successfully prepared a hydrophilic super anticorrosive coating through a simple mixing method. The coating has a contact Angle of 67.8° and a rolling Angle greater than 20°. This coating can withstand 180 days of salt spray test with no bubble or rust formation when placed on a Q 235 substrate in a 3.5 wt % NaCl solution, demonstrating the excellent corrosion resistance of the AO 0.4 AN 0.6 EP coating. Furthermore, after being immersed in a 3.5 wt % NaCl solution for 3 days, the AO 0.4 AN 0.6 EP coating exhibited the largest impedance diameter (2.07×10 8 Ω⋅cm 2 ), almost three times larger than other coatings, and possessed the highest Bode modulus value, one order of magnitude higher than other coatings. After immersion in a 3.5 wt % NaCl solution for 7 days, the AO 0.4 AN 0.6 EP coating had the largest Ecorr and the smallest icorr, indicating its superior corrosion resistance. In addition to corrosion resistance, the AO 0.4 AN 0.6 EP coating showed no signs of cracking, discoloration, or decomposition after being exposed to ultraviolet aging lights for 30 days, demonstrating its excellent UV resistance. Moreover, neither dry soil particles nor muddy water could adhere to the coating surface, proving its good self‐cleaning ability. Therefore, this coating holds promising applications in the field of super corrosion‐resistant coatings.