Study on Corrosion Resistance of Different Metal Ion Passivation Solution on Aluminum Surface
A silane passivation solution was prepared,which was composed of amino silicone resin,polyurethane resin,hexafluorotitanic acid,metal ions,corrosion inhibitor and leveling agent.The effects of different kinds of metal ions on the corrosion resistance of the passivation solution were studied.The passivation solution with Mn2+,Ce3+and Ni2+was respectively coated on the surface of aluminum plate to form a hybrid film.The aluminum plate coated with the hybrid film was immersed in mass fraction 3.5%NaCl solution for several days to investigate the corrosion resistance of different ionic passivation solutions.The corrosion resistance effect of passivation solution containing Mn2+was better than that of passivation solution containing Ce3+and Ni2+.At the same time,IR,TGA,SEM and EIS were used to characterize the morphology and structure of the hybrid film.It was seen that the hybrid film formed a strong covalent bond with the surface of the aluminum plate,and the hybrid film formed on the surface of the aluminum plate was smooth and continuous,high temperature resistance and corrosion resistance.
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