Corrosion preventive pigment comprising a phosphate source, a vanadium ion source, and optionally, a network modifier and/or a glassy material

摘要

Disclosed is a corrosion preventive pigment consisting essentially of (a) a phosphorus compound which generates phosphate ions in the presence of water and oxygen, selected from the group consisting of a phosphorous pentoxide, an orthophosphoric acid, a condensed phosphoric acid, and alkaline earth metal or transition metal phosphate, or an alkaline earth metal or transition metal condensed phosphate, and (b) a vanadium compound which generates a vanadate ion in the presence of water and oxygen, selected from the group consisting of vanadium (V) oxide, a vanadyl compound, an alkaline earth metal or transition metal vanadate, a baked condensate of alkaline earth metal or transition metal vanadates, or a heterocondensate of alkaline earth metal or transition metal vanadates; and which has a pH value of from 5 to 9.