Corrosion inhibiting pigment and method of making same

摘要

A method for preparing an extended corrosion inhibiting pigment for use in formulating protective coatings for ferrous substrates in which a particulated carrier comprised of a carbonate of zinc, calcium, strontium and/or barium is slurred in an acidic aqueous solution in the presence of molybdic oxide in a manner to cause a reaction to occur between the molybdate ions and the metallic ions on the surface of the carrier particles forming a chemically bonded coating of the corresponding metal molybdate on the unreacted core of the carrier particles, whereafter the coated carrier is separated and dried.