Preparation and Research of an Inorganic Phosphate Anticorrosive Coating with MgO@SiO2 Curing Agent

A kind of low-temperature cured inorganic phosphate coating composed of phosphate adhesive (film-forming resin) and MgO@SiO2 (curing agent) was prepared. MgO@SiO2, as curing agent, was derived by surface coating mechanisms of nano-particles to realize the gradual-release of MgO in the curing process of the coating. Not only it can increase the curing time but also can decrease the curing temperature of the coating. The MgO@SiO2 was observed by TEM, the micro-morphology, phase composition, chemical bonds, corrosion resistance and pot life of the coating were investigated using SEM, XRD, FTIR, salt spray testing and kinematic viscosity testing. Besides, the curing mechanism of the coating was also explored. Results show that, by selecting MgO@SiO2 as curing agent of the phosphate coating, the curing time of the inorganic phosphate coating was extended from tens of seconds to 120mins, and the curing temperature was decreased to 80 ℃. The prepared coating also has good moisture absorption resistance and corrosion resistance.