(1.National Engineering Research Center for corrosion control, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016)(2.Dalian Yuxiang Science & Technology Corporation, Dalian, 116088)
Keywords:
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CLC:
PACS:
TG174.46
DOI:
10.7502/j.issn.1674-3962.2014.01.03
DocumentCode:
Abstract:
The aim of this paper is to investigate the effect of SiO2 nano-concentrate and ZnO nano-concentrate on properties of epoxy and polyurethane marine coating. The corrosion-inhibiting and anti-aging properties of composite nano-coatings used in marine environment were investigated by the salt spray test, xenon lamp aging test, ocean accelerated cycle aging test. The stable well-dispersed nano-concentrates were prepared by three-step method, and epoxy and polyurethane marine nano-coatings were modified by SiO2 nano-concentrate and ZnO nano-concentrate. The work has investigated corrosion resistance, weathering resistance and antifouling property of marine nano-coating by use of transmission electron microscopy (TEM), fourier transform infrared spectrometer (FTIR), X-ray photoelectron spectroscopy (XPS), gloss meter and measuring instrument of surface contact angle. The FTIR analysis and viscosity measurement of SiO2 nano-concentrates and TEM observation of ZnO nano-concentrates demonstrate that the well-dispersed state of nanoparticles can be attributed to the strong steric effect of long carbon chains of polymer dispersing agent. The bonding strength of epoxy nano-coating with 1.0% SiO2 nano-concentrate increases from 4.4 MPa of epoxy coating without nano-concentrate to 5.6 MPa. The analytic results of salt spray test demonstrate that 1.0% SiO2 nano-concentrates improve the resistance of epoxy nano-coating to salt spray. The gloss measurement in the xenon lamp aging testdemonstrates that gloss of polyurethane nano-coating is higher than that of polyurethane coating without nanoparticles. The C/O ratio of polyurethane coating without nano-concentrate after accelerated cycle agingtest dramatically decreases 20.1% while the C/O ratioof polyurethane nano-coatingwith 1.2 % ZnO nano-concentrate after aging test only decreases 10.7%.The measurements of gloss and surface contact angle during ocean accelerated cycle aging test indicate that 1.2% ZnO nano-concentrations greatly enhance the anti-aging and surface contact angle of polyurethane coating. In conclusion, the nano-concentrates can improve corrosion resistance and weathering resistance of nano-coatings in marine heavy corrosion environment.