CaZn{hd 2{b (PO{HD 4{B ){HD 2 {B .2H{HD 2{B O anticorrosion pigment

• Main Authors: KRESSE; PETER, HUND; FRANZ
• Format: Patent
• Language: English
• Published: 08.05.1979
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOUNDS THEREOF; CORRECTING FLUIDS; DYES; FILLING PASTES; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INKS; INORGANIC CHEMISTRY; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-METALLIC ELEMENTS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; PREPARATION OF CARBON BLACK; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; USE OF MATERIALS THEREFOR; WOODSTAINS

An anticorrosion pigment suited for paints and lacquers and consisting of CaZn2(PO4)2 . 2H2O crystallizing in the Scholzite lattice and having a specific surface according to BET of from 0.1 to 50 m2/g is produced by a process wherein (A) (I) A SALT SOLUTION CONTAINING CALCIUM AND ZINC CATIONS IN A RATIO OF ABOUT 1:2 IS NORMALLY, INVERSELY OR SIMULTANEOUSLY PRECIPITATED IN AIR AT TEMPERATURES OF UP TO ABOUT 100 DEG C. with an equivalent or substantially equivalent quantity of a solution containing an alkali metal or ammonium phosphate ion; or (ii) compounds of calcium and zinc, which can be decomposed with relatively strong acids or neutralized with acids, in a ratio of about 1:2, have phosphoric acid or ammonium phosphate added to them in approximately the quantity which is required for decomposition or neutralization, or in a slight excess of that quantity, at temperatures of up to about 100 DEG C.