Surface treatment solution of the hot-press-plated steel sheet

A surface treatment liquid having excellent stability during storage, processing film to be generated, water resistance, solvent resistance, adhesion to the plated steel sheet, hot lubricity, further chemical conversion treatability after hot press , corrosion resistance after painting, it is possible to provide a surface-treated steel sheet excellent in spot weldability. ZnO aqueous dispersion (A) and water-dispersible organic resin (B) Toomi, the ZnO aqueous dispersion (A) is water and the particle size comprises ZnO particles is 50 to 300 nm, the water dispersible organic resin (B) has an emulsion particle size of the acid value and 5~300nm of 5~45mgKOH / g, the mass of ZnO particles of the ZnO aqueous dispersion with (W