Abstract: Corrosion inhibiting pigments on the basis of zinc silicate are produced from 35-65% by weight of ZnO, 15-35% by weight of SiO.sub.2, 5-20% by weight of B.sub.2 O.sub.3, and 1-20% by weight of WO.sub.3 which can be entirely or partly substituted by, MoO.sub.3 and/or SnO.sub.2 wherein the amount of zinc silicate, boron oxide and, if necessary, the other metal oxides or their hydrates singly or in a combination thereof is such that the entire combination with the zinc silicate and the boron oxide contains at least one of the oxides WO.sub.3, MoO.sub.3 and/or SnO.sub.2 in amounts bringing the balance to 100%. The pigments can be manufactured by dry mixing of the components, melting for 1-3 hours at 1100.degree. C.-1400.degree. C. and subsequent grinding to desired fineness.

Abstract: The invention relates to corrosion-inhibiting pigments containing metallic oxides, phosphates and/or molybdates, wherein the metals are zinc, aluminum, iron, barium, strontium, calcium, magnesium and titanium, singly or in combination, wherein the pigments also contain 0.03-2% by weight of soluble sodium dichromate or equivalent amounts of potassium dichromate, ammonium dichromate or equivalent amounts of respective chromates or chromic acid, singly or in their mixture. The invention also relates to a process for the manufacture of the pigments by thorough homogenization of the chromate components with the pigments, and to the use of the pigments in primers for ferrous and non-ferrous metallic substrates.

Abstract: Permanently non-dusting pigment and dye preparations, which contain as dedusting agents,(a) a surface-active substance in an amount of from 0.

Abstract: The dust producing properties of a pigment or dye are measured under conditions which close approximate those during handling. A vessel with baffles having pigment or dye therein is rotated for a specified time while air is drawn through the rotating vessel by a specified amount of vacuum applied downstream of the vessel. The baffles disturb the pigment or dye in the vessel, creating dust particles which are entrained in an airstream created by the vacuum. Larger particles trapped in this vacuum are removed by a separator, while the dust particles are trapped in the airstream are trapped by a filter. The dusting properties of the pigment or dye in the vessel may then be determined by weighing the filter.

Abstract: Aluminum zinc phosphate hydrates or basic aluminum zinc phosphate hydrates are manufactured by reacting 1 mole of aluminum hydrogen phosphate with from 2.4 to 4 moles of zinc oxide, if necessary with the addition of up to 0.4 moles of alkali aluminate or the equivalent quantity of alkali hydroxide. A 50% by weight acidic aluminum hydrogen phosphate solution is preferably used for the reaction which is carried out at an elevated temperature in the range from 30.degree. to 80.degree. C. The aluminum zinc phosphate hydrates produced by the method are useful anti-corrosion pigments for use in paints.