Synthesis and characterization of complex acrylate resin coating on galvanized steel sheet

A complex acrylate resin coating was synthesised on galvanized steel sheet. The micro-morphology of the coating was observed by SEM. FTIR spectra was used to characterize the molecular structure of the complex acrylate resin coating. The corrosion resistance of the coating was evaluated by neutral salt spray test and electrochemistry test. The self-rehealing performance of the coating was examined with immersion scratch test. The results show that the surface of the coating was uniform and compact. The coating could endure neutral salt spray test for 72 h. And therewith increase the corrosion resistance of galvanized steel sheet with higher impedance and polarization resistance in comparison to the bare galvanized steel sheet. The immersion scratch experiment confirmed that the coating exhibited self-rehealing performance to some extence. The crosslinking reactions may be taken place between ammonium zirconium carbonate(AZC) and hydroxyl and carboxyl of the acrylic resin during synthesis so that to form a high cross linked density interpenetrating structure network so that the coating could become much effective as a barrier for corrosive substances. When the coating was damaged, there was reaction might take place between zinc with molybdate and phosphate on the surface of zinc to produce water-insoluble salts, which could absorb on the surface of zinc spontaneously to play an important role in coating rehealing.