To meet the need of long-term anticorrosive protection of steel, a heavy-duty anticorrosive coating systems was
developed with Fluorocarbon top paint which was modified by nano-TiO2. The corrosive characteristics of low carbon
steel coated with the system were investigated in seawater by the exposition tests and Electrochemical Impedance
Spectroscopy (EIS). The results show that the protective system with fluorocarbon top coating modified by nano-TiO2
has much better endurance than the reference system with fluorocarbon top coating not modified by nano-TiO2. There
isn't any rusting and blistering on the surface of former coating, the coating system remains in "GOOD" condition. But
some rusting and blistering were found on the surface of reference coating. EIS results indicated that the impedance of
the nano-coating system decreases much less than that of the reference one. The nano-coating system is hopeful to meet
the need of new coatings standard and to provide a target useful coating life of 15 years for ship's ballast.
For developing new marine non-toxic antifouling coating, it was investigated the luminescence property in seawater on
long-life afterglow fluorescent coatings modified by nano-TiO2. The influences of the content and crystalline
microstructure of fluorescent powder, different binder resins of coating were studied on the luminescence characteristic
of the coating. The results showed that fluorescent coatings modified by nano-TiO2 represent the good luminescence
characteristic in seawater. With the increase of the content of fluorescent and nano-TiO2 powders in coating, the
luminescence property of coating increases. As light afterglow time increases, the illuminance of both fluorescent
powder and luminous coating decays exponentially. Compared with long-life afterglow fluorescent coatings not
modified by nano-TiO2, the afterglow illuminance of the coatings modified by nano-TiO2 was remarkably improved. The
luminescence property in seawater of the coating based on fluorocarbon resin is much more than that of the coating
based on acrylate resin.
Fluorocarbon coatings were developed with respectively 10%, 20% and 30% PTFE powder to prevent marine
biofouling. Influence of content of PTFE on microstructures and roughness of coatings was investigated using SEM
and roughometer. It was studied that the effects of coating roughness on settlement of benthic diatom and Ectocarpus
by using biological microscope, stereo microscope, image processing and spectrophotometer. Results indicated that the
surface roughness of coatings decreases and the quantity of benthic diatom and Ectocarpus reduces attaching onto the
coating with the increase of content of PTFE in paint studied. Benthic diatoms attached much more on horizontal
specimen than on vertical one; they prefer to settle onto the coatings that there are lots of micro-cracks in it. These
results are helpful for developing new non-toxic antifouling paints.
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