Process and composition for passivating metal surfaces

a technology of passivating metal and composition, which is applied in the direction of metal material coating process, coating, etc., can solve the problems of affecting the corrosion resistance of galvanized coating, and affecting the appearance of galvanized coating, so as to improve the corrosion resistance, and improve the effect of paint adhesion

Inactive Publication Date: 2020-10-29
BULK CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0009]To meet these and other needs, a composition is provided for treating a metal surface to improve corrosion resistance, paint adhesion, and / or maintain low electrical contact resistance. In one embodiment, the composition comprises water, a trivalent chromium salt with the formula Cr(HxPO4)3, where x is 1.5 or 2, a polymer system having carboxylic functional groups, an organo-functional silane, and an organopolyphosphonic acid or salt thereof.

Problems solved by technology

One of the commonly encountered problems with galvanized coatings of all kinds is “white rust” or “white storage stain.” It is manifested as a bulky, white, powdery deposit that forms rapidly on the surface of the galvanized coating under certain specific conditions.
White rust can cause considerable damage to the coating and is always detrimental to the galvanized coating's appearance.
With newly galvanized steelwork, the zinc's surface has been subjected to little oxidation and is at its most vulnerable.
Although the aforementioned coatings enhance corrosion resistance and paint bonding properties, the coatings have a serious drawback.

Method used

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  • Process and composition for passivating metal surfaces
  • Process and composition for passivating metal surfaces
  • Process and composition for passivating metal surfaces

Examples

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examples

[0075]The following examples are included to more clearly demonstrate the overall nature of the invention. FIGS. 1-3 illustrate the improved results obtained by employing aqueous compositions of this invention. These examples are exemplary, not restrictive, of the invention.

Synthesis of Composition 1

[0076]In the below experiments, a batch of Cr(H2PO4)3 was first synthesized via the combination of the raw materials: (1) CrO3; (2) H3PO4; and (3) H2O2. The final concentration of the master batch was determined to be 43.84% wt. %. This master batch was then combined with the polymer system having carboxylic functional groups, the organo-functional silane, and the organopolyphosphonic acid or salt thereof identified in Table 1 below:

TABLE 1AmountRaw MaterialChemical Name(wt. %)Cr(H2PO4)3Chromium Dihydrogen Phosphate6.8(43.84%)DEQUEST 20101-Hydroxyethylidene-1, 1-diphosphonic4.1acidSOKALAN CP12SAcrylic Acid Copolymer4.6DYNASYLAN3-Aminopropyl-triethoxysilane2.2AMEO A1100DI H20Water82.3

Synt...

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Abstract

Aqueous compositions useful as a passivation treatment prior to painting to reduce corrosion. The compositions includes water, a trivalent chromium salt with the formula Cr(HxPO4)3, where x is 1.5 or 2, a polymer system having a plurality of carboxylic functional groups, an organo-functional silane, and an organopolyphosphonic acid. A process for treating a metal surface includes contacting the surface with such aqueous compositions. The compositions and the processes provide benefits in comparison to the zinc phosphate metal pretreatment thought to be the standard in the industry.

Description

RELATED APPLICATION[0001]This application claims the benefit of priority to U.S. Provisional Patent Application Ser. No. 62 / 839,003, filed on Apr. 26, 2019, all the contents of which are incorporated in this application by reference.TECHNICAL FIELD[0002]This invention relates generally to compositions and the use of such compositions for passivating metal surfaces. The composition may be used as a passivation treatment and is intended to be used to treat a range of metals including zinc, iron, copper, brass, magnesium, aluminum, cadmium, or alloys thereof. More particularly, this invention relates to an aqueous composition, suitable for use as a dried-in-place coating for metal, that comprises a trivalent chromium phosphate salt, a phosphonate, a carboxylate polymer, and a silane. The composition may be used as a pretreatment prior to painting and is useful to prevent the formation of white rust on zinc containing metals, without the use of hexavalent chromium.BACKGROUND OF THE INVE...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C22/07
CPCC23C22/07C23C22/10C23C2222/10C23C2222/20C09D5/084C23C22/73C23C22/76C23C22/08
Inventor HANNA, CODY R.
Owner BULK CHEM
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