Preparation of Super-Hydrophobic Coating with Micro-Nano Structure by Electrodeposition and Its Corrosion Resistance to Seawater

Electrodeposition was used to prepare a super-hydrophobic coating with micro-nano structure on the surface of 316L stainless steel. The relationship between wetting ability and surface structure was studied by scanning electron microscopy (SEM) and surface contact angle measurement. And the corrosion resistance of super-hydrophobic coating in simulated seawater was studied by electrochemical impedance spectrum and dynamic potential polarization curve. The results show that the deposition morphology on the surface of 316L stainless steel changed from cone with pyramid structure after the first electrodeposition to micro-nano petallike structure after the second electrodeposition. The static contact angle of the coating prepared by two electrodepositions to water reached 153.74°, presenting the best super-hydrophobic property. The super-hydrophobic coating had corrosion resistance comparable to that of 316L stainless steel, and its micro-nano structure reduced the possibility of pitting corrosion.