Off-white and gray autodeposition coatings
AssigneeHenkel AG & Co. KGaA
InventorsOmar Lufti Abu-Shanab, Bashir Ahmed, Manesh Nadupparambil Sekharan, William E. Fristad, Nicholas Herdzik
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Abstract
A method for coating a metal substrate with a white, off-white or gray colored autodeposited coating comprising water, polymeric resin, HF and pigment particles comprising a core of titanium dioxide, an intermediate zirconia and/or alumina layer, and an outer organic layer, optionally the particles are treated with an anionic surfactant.
Claims22
An article of manufacture comprising at least one active metal substrate surface having deposited thereon a uniform white, off-white or gray autodeposition cured coating deposited according to a method comprising:
- contacting an active metal substrate surface for 0.5 to 10 minutes, with an autodeposition bath composition to form a white, off-white or gray initially adherent coating on said surface;
- said autodeposition bath composition comprising:
- a. an aqueous solution of an autodeposition accelerator comprising an acid, in an amount such that the composition has a pH of about 1.0 to about 4.0, and at least one oxidizing agent;
- b. particles of a coating-forming polymeric material dispersed throughout the composition;
- c. a component of non-black solid pigment particles, stabilized against said acid, dispersed throughout the composition;
- d. an emulsifying component comprising an anionic surfactant;
- and, optionally,
- e. black pigment and/or finely divided solids suitable as fillers in the coatings to be formed from the composition;
- said composition being effective to chemically attack, in the absence of an external electrical potential, the active metal surface immersed therein to dissolve therefrom metal to release ions of said metal and sufficient to cause said polymeric material and said non-black solid pigment particles to deposit uniformly on the active metal surface as the initially adherent coating which increases in weight or thickness the longer the time said surface is immersed in said composition;
- rinsing said initially adherent coating with a rinse comprising water;
- optionally, drying said initially adherent coating;
- and
- curing said initially adherent coating to form a uniform cured, white, off-white or gray coating.
An intermediate article of manufacture comprising:
- a. an active metal substrate surface;
- b. a uniform white, off-white or gray, initially adherent, uncured autodeposition coating deposited on the active metal substrate surface, dried thereon, and comprising a coating-forming polymeric material having TiO2 particles dispersed throughout;
- and optionally further comprising at least one of black pigment, oxides Al, oxides of Zr, hydrolysis products of oxides of Ti, hydrolysis products of oxides of Al. and hydrolysis products of oxides of Zr.
An article of manufacture comprising:
- a. an active metal substrate surface;
- b. a cured uniform white, off-white or gray, autodeposition coating chemically adhered to the active metal substrate surface;
- said coating comprising a cured coating-forming polymeric material and TiO2 particles dispersed throughout;
- and optionally further comprising at least one of black pigment, oxides Al, oxides of Zr, hydrolysis products of oxides of Ti, hydrolysis products of oxides of Al. and hydrolysis products of oxides of Zr.
Dependencies are inferred from the claim text.