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Due to magnesium's active chemical property, a novel environmental protective water based metallic coating was developed, which mainly contains metal flake, nano-silica, silicate and silane. The coating's properties were investigated by neutral salt spray test, micro-hardness testing, adhesion test and electrochemical technique etc. Meanwhile the coating surface and microstructure was observed by scanning electron microscopy (SEM). Furthermore, the effect of nano silica on the coating was also explored. Results showed that an excellent adhesive, heat-resisting, protective coating for AZ91D magnesium alloy could be achieved by this technique. It also indicated that nano silica could greatly improve the properties of coating. In the paper, mechanism of nano silica coating was also discussed.

The nano-silica (SiO₂) was introduced into the cyanate ester (CE) resin matrix to fabricate composites by physical blending method, and then the composites were treated in different high-temperature conditions. The results of differential scanning calorimetry (DSC) indicated that the thermal properties of SiO₂ filled composites are higher than that of pure CE. But the heat resistant of them was all decreased after heat treatment. The filled composites had lower dielectric constant and loss, indicating that the introduction of SiO₂ had positive effect on the dielectric properties of CE. The high temperature treatment made the dielectric properties of CE and its composites show a trend of decrease.