The present invention relates to an anticorrosion coating composition for metallic parts based on particulate metal in aqueous dispersion comprising an organic titanate or zirconate compatible in aqueous phase or in organic phase, optionally a silane-based binder, and water. The present invention likewise relates to an anticorrosion coating of metallic parts obtained from the coating composition according to the invention as well as a metallic substrate provided with this anticorrosion coating. The invention additionally relates to an aqueous composition of C1-C8 tetraalkyl titanate, intended for the preparation of a coating composition of a metallic substrate in aqueous dispersion, as well as the process for preparation of such a composition.