Metal protective coating, hot dip Zn plated metal material, and hot dip Al-Zn plated metal material using the same

摘要

A metal protective coating is provided, which is obtained by mixing homogeneously a raw mixture, which contains water soluble silicate, promoter, silane coupling agent, silicon oxide packing, water soluble film formation resin, and water; wherein, the promoter is at least one selected from the group consisting of methyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, carboxymethyl-hydroxyethyl cellulose, and their soluble salts; the silane coupling agent contains a first silane derivative shown in formula (1), wherein, R1, R2, and R3 are methoxyl or ethyoxyl respectively, and n is an integer with the range of 1-4. A hot-dip Zn metallic material and a hot-dip AlZn alloy metallic material are further provided. The protective film formed by the metal protective coating as provided has outstanding corrosion resistance, water resistance, thermal resistance, and fingerprint resistance properties.