Process and composition for treating metal surfaces using trivalent chromium compounds

A technology of metal surface and composition, applied in metal material coating process, coating, primer, etc., can solve problems such as environmental hazards and health hazards

Active Publication Date: 2016-07-06
BULK CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hexavalent chromium has toxic effects and has been recognized as a hazard to the environment by the Environmental Protection Agency (Environmental Protection Agency) and a health hazard by the Occupational Safety and Health Agency (Occupational Safety and Health Agency)

Method used

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  • Process and composition for treating metal surfaces using trivalent chromium compounds
  • Process and composition for treating metal surfaces using trivalent chromium compounds
  • Process and composition for treating metal surfaces using trivalent chromium compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The 1900 pretreatment is a pretreatment composition sold by Bulk Chemicals, Incorporated of Reading, PA that includes distilled water, aminopropyltriethoxysilane, and fluozirconic acid. More specifically, 1900 pretreatment agents include distilled water, A-1100 / DyslanAmeopure, hydrofluorozirconic acid, and ErosinRedGR. A-1100 / Dyslan Ameopure is aminopropyltriethoxysilane commercially available from Sivento Incorporated of Piscataway, New Jersey, and ErosinRedGR is a dye commercially available from Pylam Products of Tempe, Arizona. The weight percentages added are as follows: 85.1899% of distilled water, 9.57% of A-1100 / DyslanAmeopure, 5.24% of hydrofluorozirconic acid (concentration 45%), and 0.0001% of ErosinRedGR.

[0048] High-strength aluminum alloy 2024-T3 and 6061-T6 panels were used for composition testing. Bulk 737G cleaner is a proprietary alkaline powder cleaner sold by Bulk Chemicals, Incorporated of Reading, PA and was used as the cleaner.

[0049] P...

Embodiment 2

[0058] 2024-T3 and 6061-T6 boards in Bulk Cleaning was performed by immersing in 737G detergent for 2 minutes at 140°F with a detergent content of 15 grams per liter. The plates were then rinsed with tap water for 1 minute at ambient conditions. Plates were then rinsed with deionized water for 1 minute at ambient conditions.

[0059] The pretreatment composition includes 2% v / v of 1900 pretreatment agent+0.42 g / L chromium(III) fluoride tetrahydrate+0.005 g / L ammonium bifluoride+0.66 g / L 45% fluozirconic acid, adjust pH to about 4. The panels were then dipped again in the above pretreatment composition for 2, 5 or 10 minutes at 110°F.

[0060] The plate was then dried with a hot air drier. The 2024-T3 panels were salt sprayed for 336 hours as detailed in ASTM B117-07 above. The 2 minute preconditioning failed. 5 min and 10 min preconditioning passes. The 10 minute pretreated had small black spots, but no pitting or white corrosion.

[0061] As discussed above, accepta...

Embodiment 3

[0066] Various 2024-T3 and 6061-T6 boards in Bulk Cleaning was performed by immersing in 737G detergent for 2 minutes at 140°F with a detergent content of 15 grams per liter. The plates were then rinsed with tap water for 1 minute at ambient conditions. Plates were then rinsed with deionized water for 1 minute at ambient conditions.

[0067] The pretreatment composition included 3.5% v / v of 1900 pretreatment agent+0.37 g / L chromium (III) fluoride tetrahydrate+0.82 g / L chromium nitrate nonahydrate (III)+0.009 g / L ammonium difluoride+1.16 g / L 45% fluozirconic acid, Adjust the pH to about 4.

[0068] The panels were then dipped in the above pretreatment composition for 10 minutes at 95-100°F. The plate was then dried with a hot air drier. 2024-T3 and 6061-T6 panels were salt sprayed as detailed in ASTM B117-07 above. The 2024-T3 board passed the 336-hour test, and the 6061-T6 board passed the 168-hour test.

[0069] As discussed above, with the Keithley Multimeter mentio...

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Abstract

An acidic, aqueous composition contains a trivalent chromium compound, an organo-functional silane, and a compound of a group IV-B element. The composition protects metal surfaces, preferably aluminum and aluminum alloys, against corrosion and improves their paint adhesion. The trivalent chromium compound may comprise chromium fluoride and optionally others, such as chromium nitrate. The organo- functional silane is preferably an aminopropyltriethoxy silane, and the compound of a group IV-B element is preferably fluorozirconic acid. The composition can either be dried-in-place or rinsed before a further coating layer is applied. The composition may also include at least one polymer having a plurality of both carboxylic functional groups, alone or with hydroxyl groups. A process uses the aqueous composition either with or without the organo-functional silane along with a sealing step following the application of the aqueous composition; the sealing step involves applying a sealing composition, including an organo-functional silane, to the metal surface.

Description

[0001] This application is a divisional application of application No. 200980126616.0 filed on May 1, 2009, entitled "Method and Composition for Treating Metal Surfaces Using Trivalent Chromium Compounds". technical field [0002] The present invention relates to compositions and the use of such compositions for improving the corrosion resistance and paint adhesion of metal surfaces, and for maintaining low contact resistance on metal surfaces. The invention is particularly well suited for the treatment of aluminum and aluminum alloys. Background technique [0003] As traditional conversion coatings, hexavalent chromium compounds have been used to treat metal surfaces to improve their corrosion resistance and paint adhesion. However, hexavalent chromium has toxic effects and has been recognized as a hazard to the environment by the Environmental Protection Agency (Environmental Protection Agency) and a health hazard by the Occupational Safety and Health Agency (Occupational ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/83C09D5/08
CPCC09D5/002C09D5/08C09D5/084C23C22/34C23C22/83C23C2222/10C23C2222/20
Inventor R·J·丘奇
Owner BULK CHEM
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