Anticorrosive pigments on the basis of tertiary alkaline-earth aluminum phosphates and a process for the production thereof

摘要

The present invention provides anticorrosive pigments on the basis of tertiary alkaline-earth aluminum phosphates, particularly those where the numerical atomic ratio x:y:z of formula AE.sub.x Al.sub.y (PO. sub.4).sub. z of alkaline earth to aluminum to phosphorus or phosphate is 50-70% to 5- 30% to 20-50%. It also provides a process for their production in which an alkaline-earth compound and aluminum compound sufficiently soluble with phosphoric acid are reacted with phosphoric acid, the precipitated pigment is filtered off as usual and dried, optionally calcined and optionally ground.