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US 12,686,925 B2Granted
Bismuth compositions for metal pretreatment applications
AssigneeHenkel AG & Co. KGaA
InventorsDonald Robb Vonk, Brian J. Marvin, John L. Zimmerman
Life of this patent
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Abstract
Provided are bismuth conversion coating compositions that deposit bismuth conversion coatings on a variety of metal substrates, methods of making bismuth conversion coating compositions, methods of depositing bismuth conversion coatings on metal substrates and articles of manufacture having metal surfaces comprising a bismuth conversion coating.
Claims19
An acidic aqueous bismuth conversion coating composition comprising:
- A) dissolved and/or dispersed bismuth;
- B) at least one water-soluble aliphatic organic chelating agent present in an amount sufficient to solubilize or disperse A);
- C) dissolved copper ions;
- and
- having a pH in a range of from about 2.0 to about 6.
2 more elements
An acidic aqueous bismuth conversion coating composition comprising:
- A) 100 to 1000 ppm dissolved and/or dispersed bismuth;
- B) a complex fluoroacid, or salt thereof and/or one or more water soluble aliphatic organic acids and salts thereof selected from linear, branched or cyclic;
- saturated or unsaturated C3-C12 organic acids and salts thereof, present in an amount sufficient to solubilize or disperse A);
- C) optionally dissolved copper ions;
- and
- at least one pH adjuster, in the form of an acid, base or a buffering acid/base combination present in a quantity sufficient to provide the composition with a pH in a range of from about 2.0-6.0;
- said composition being capable of producing a conversion coating on CRS that shows no red rusting upon 4 hour immersion in 0.1M NaOH.
4 more elements
Dependencies are inferred from the claim text.