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US 2014/0227514 A1Published application
Zirconium-based coating compositions and processes
AssigneeHenkel AG & Co. KGaA
InventorsElizabeth J. Siebert, Bruce H. Goodreau
Life of this patent
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Abstract
Compositions and methods for depositing improved zirconium oxide conversion coatings, as well as compositions capable of depositing an adherent zirconium oxide conversion coating on a substrate in the absence of prior cleaning are provided.
Claims18
An aqueous composition, which comprises water and components:
- A) a source of dissolved zirconium;
- B) a source of at least one first surfactant that is cationic at a selected pH range, said selected pH range being that of a working bath formed by the aqueous composition;
- C) a source of at least one non-ionic surfactant different from B).
-11. (canceled)
A method for increasing deposition rate of a zirconium oxide depositing conversion coating bath, comprising the steps of:
- 1) providing a metal substrate having metal surfaces selected from ferrous metal, zinc, zinc alloy, aluminum, aluminum alloy and combinations thereof;
- 2) contacting said surface with a zirconium oxide depositing conversion coating bath comprising:
- a. a zirconium-based metal pretreatment coating composition comprising 50 to 1000 ppm of dissolved Zr, 0 to 50 ppm of dissolved Cu, 0 to 100 ppm of SiO2, 50 to 2000 ppm of total fluoride, 10 to 120 ppm of free fluoride;
- and
- b. a surfactant combination comprising:
- a source of a first surfactant that is cationic at a pH range of the zirconium oxide depositing conversion coating bath;
- a source of at least one non-ionic surfactant;
- different from the first surfactant;
- and
- c. optionally a chelating agent and/or other additives;
- for a time sufficient to form a zirconium oxide containing pretreatment coating having a selected thickness on the metal substrate;
- and
- 3) optionally applying a paint to the metal pretreatment coated metal substrate;
- wherein the time of step 2) is less than a time required to form another zirconium oxide containing pretreatment coating having the selected thickness on the metal substrate by contact with a.) in the absence of:
- b) and, if present, c).
12 more elements
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Dependencies are inferred from the claim text.