Surface modification processing method of hot dipping steel material and surface modified hot dipping metal steel material

The invention is to forming an improved surface film layer with excellent base adhesiveness, alkali resistivity, dew rust resistivity, top coating adhesiveness and scuffing resistivity on the surface of hot dip coated steel. Contacting the hot dip coated steel surface to the under-mentioned aqueous treatment liquid while it is active to forming the improved surface film layer. The aqueous treatment liquid includes: (A) colloidal dispersive matter; (B) additional colloidal content component (a) different in metal kind with (A) and/or basic compound (b) of metal different from the metal of colloidal dispersive matter; and (C) compound containing alkali metal and alkali earth metals according to need.