| abstract |
The invention provides metal protective coating, which is obtained by uniformly mixing a raw material mixture. The raw material mixture contains water soluble silicate, an accelerant, a silane coupling agent, a silicon oxide filler, a water soluble film-forming resin and water; the accelerant is thiourea and/or urea; and the silane coupling agent contains a first silane derivative represented by the formula (1), wherein R1, R2 and R3 are respectively either a methoxy group or an ethyoxyl group, and n is an integer from 1 to 4. The invention further provides a hot galvanizing metal material and a hot dip aluminum-zinc metal material. The protective film prepared by the metal protective coating provided by the invention is excellent in corrosion resistance, water resistance, heat resistance and fingerprint resistance. The formula (1) is shown in the description. |