Use of dithiophosphinic acid and/or its salts for producing anti-corrosion coatings that are devoid of chrome
AssigneeBASF Coatings GmbH
InventorsMonica Fernandez Gonzalez, Markus Hickl, Cordula Mock-Knoblauch, Manfred Essig, Wolfgang Schrepp, Manfred Biehler
Life of this patent
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Abstract
Use of dithiophosphinic acids of the general formula HS2P(R1)(R2) and/or salts thereof for producing chrome-free, polymer-containing corrosion control layers on metallic surfaces, R1 and R2 independently of one another each being organic radicals having 1 to 30 C atoms.
Claims14
A coating in combination with a metallic surface, the coating comprising a radiation-crosslinked polymer positioned on the metallic surface, wherein the crosslinked polymer comprises:
- a radiation crosslinked, polymeric binder of a (meth)acrylate monomer, or (meth)acrylate prepolymer selected from the group consisting of polyfunctional (meth)acrylates, urethane (meth)acrylates, polyester (meth)acrylates, epoxy (meth)acrylates, carbonate (meth)acrylates, polyether (meth)acrylates, and any mixture thereof, and
- 0.25% to 10% by weight of at least one dithiophosphinic acid of formula HS2P(R1)(R2) and/or a salt thereof, wherein R1 and R2 are, independently of one another, organic radicals with 1 to 20 carbon atoms,
- wherein the coating is a chrome-free corrosion control coating, and has a thickness of from 3 to 15 μm.
An aqueous integrated coating in combination with a metallic surface, the coating comprising a styrene-acrylate dispersion, an anticorrosion pigment based on zinc phosphate, and 0.25% to 10% by weight of at least one dithiophosphinic acid of formula HS2P(R1)(R2) and/or a salt thereof, wherein R1 and R2 are, independently of one another, organic radicals with 1 to 20 carbon atoms,
- wherein the integrated coating, and has a thickness of from 40 to 100 μm.
Dependencies are inferred from the claim text.