Phosphate-containing anti-corrosive pigment
AssigneeChemische Fabrik Budenheim KG
InventorsSven Bach, Laura Erbach, Birgit Faßbender, Thomas Futterer, David Garcia Martinez, Christian Litterscheid, Stefan Mallmann, Siegfried Mengel, Sebastian Moschel, Mikel Schöller, Hendrik Wermter, Rüdiger Wissemborski
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Abstract
The present invention relates to a method for producing a phosphate-containing anti-corrosive pigment, to the phosphate-containing anti-corrosive pigment obtainable by this method, and to the use of the phosphate-containing anti-corrosive pigment for passive protection against corrosion.
Claims14
A method for producing a phosphate-containing anti-corrosion pigment, comprising the following steps:
- a) providing hydroxyapatite or calcium-magnesium-phosphate particles or mixtures of the aforementioned as start particles in an aqueous solvent or dispersant,
- b) adding lime milk, a magnesium compound, and phosphoric acid to the aqueous solvent or dispersant in order to produce a reaction mixture,
- c) reacting the reaction mixture to form the phosphate-containing anti-corrosion pigment:
- at a temperature in the range of 20° C. to 105° C. and
- at a pH value in the range of 6.0 to 13.0,
- d) separating at least a part of the phosphate-containing anti-corrosion pigment from the aqueous solvent or dispersant, and
- e) Optionally:
- drying the phosphate-containing anti-corrosion pigment.
A method comprising using a phosphate-containing anti-corrosion pigment comprising calcium-magnesium phosphate particles having a specific surface area ≤50 m2/g and an aspect ratio of the primary particles <5 as phosphate-containing anti-corrosion pigment.
Dependencies are inferred from the claim text.