Up to now, Parylene is the best anticorrosive materials, which resists any corrosion of strong acid, alkali and solvent. In particular, it helps the products avoid the influences from moisture, salt mist, corrosive gas and other severe conditions. Vapor growth bring its unique no-defect performance advantage. The polymeric growth prevent the diffusion of ion in the coating and interface, greatly decreasing the general corrosion under the coating.