| 摘要 |
One package zinc rich coatings for the protection of ferrous surfaces. The coatings contain zinc dust in a vehicle comprising an organic polysilicate, an amine or other hydroxyl source and a solvent. The ratio of vehicle ingredients is selected so that the volume average dielectric constant of the vehicle is below approximately 14, thus insuring that the zinc dust will not pack or settle into a hard mass and will be readily redispersible even after prolonged storage in a closed container. Upon application to a surface, atmospheric moisture reacts with the amine to provide OH ions, which in turn hydrolyze the polysilicate to form a tough adherent silicate binder for the zinc.
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