Fabrication Of An Orderly Layered Nanostructure Coating Via Cathodic Epd Of Silanized Go Nanosheet For Anti-Corrosion Protection

We designed a silanized GO coating with an orderly layered nanostructure based on the integrated effects of the inherent impermeability of graphene and the unique structural advantages induced by the nacre-like layered nanostructure to get long-term durability. GO nanosheet was silanized with an amino-functionalized silane to facilitate positive charge and provide cross-linking groups. The silanized GO nanosheet was parallel stacked onto the metal surface by cathodic electrophoretic deposition (EPD) with carefully controlling the deposition process. Experimental results show that the optimized coating with a thickness of 10 mu m presents excellent protective performance even after 960 h immersion in the 3.5 wt.% NaCl solution. The analysis results of electrochemical impedance spectroscopy (EIS) and corrosion morphology reveal that the outstanding long-term durability of the optimized coating is due to the inherent impermeability, and the orderly layered stacking of GO nanosheet combining with the stability crosslinking bond of the siloxane group. This study highlights a workable way for large-scale preparation of coatings with excellent long-term durability since the validity of EPD of silanized GO nanosheet.