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Non-chromated oxide coating for aluminum substrates

A technology of conversion coating and oxide film, which is applied in the coating process of metal materials, etc., and can solve environmental, health and safety issues and other issues

Inactive Publication Date: 2005-07-06
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solutions used to create these conversion coatings contain carcinogenic hexavalent chromium, fluoride and cyanide, all of which compounds pose serious environmental, health and safety concerns

Method used

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  • Non-chromated oxide coating for aluminum substrates
  • Non-chromated oxide coating for aluminum substrates
  • Non-chromated oxide coating for aluminum substrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] NOTE: The above formulations represent the chemical amounts that yield the best process results, however, the formation of the coating is not limited by these parameters.

[0065] Composition (see note below)

Prepared per liter

control per liter

Cobalt nitrate (hexahydrate)

Co(NO 3 ) 2 ·6H 2 o

26g

24-29g

Sodium acetate CH 3 COONa

or

Aluminum acetate CH 3 COONH 4

26g

35g

24-29g

32-36g

sodium chlorate

NaClO 3

13g

12-14g

water (deionized)

margin

margin

temperature

room temperature

120-140°F (preferably 120°F)

[0066] NOTE: The formulations above represent the chemical amounts that yield the best process results, however, coating formation is not limited by these parameters.

[0067] Composition (see note below)

Prepared per liter

control per liter

Cobalt ...

Embodiment 4

[0072] Tank and Process Parameters

[0073] Cobalt conversion solution:

[0074] The following will establish the preparation sequence of the tank and discover the importance of achieving compatible, reproducible reaction products:

[0075] 1. Fill the tank (with an inert liner such as neoprene or preferably stainless steel tank) 2 / 3 full with deionized water. Begin air bubbling to a smooth roll.

[0076] 2. Add and dissolve the necessary chemicals in the following order:

[0077] cobalt pinate

[0078] sodium nitrate

[0079] sodium chlorate

[0080] 3. Fill the tank with water to the necessary amount and allow the solution to react for at least 8 hours.

[0081] 4. Heat the tank to 120-140°F (120°F is preferred for longer tank life and good tank stability) and hold, the solution is now ready for operation.

[0082] Post-treatment solution:

[0083] The tank bath preparation procedure for post-treatment will be carried out below. It is impo...

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Abstract

An improved process for producing corrosion resistant and paint adherent oxide thin film conversion coatings on a substrate, wherein the substrate is aluminum or an aluminum alloy, on an industrial scale comprising the steps of: (a) A kind of reaction solution comprising water is provided, does not contain the cobalt conversion solution of the formation oxide film of triethanolamine (TEA), and it is prepared by the reaction of following raw material: (1) a kind of water-soluble divalent cobalt salt CoX2, wherein X=Cl, Br, NO3, CN, SCN, 1 / 3PO4, 1 / 2SO4, 1 / 2CO3, formate or acetate; (2) a water-soluble complexing agent selected from MeNO2, MeAc, MeFm , NH4Ac and NH4Fm, where Me is Na, K or Li; Ac is acetate; and Fm is formate; (3) a accelerator selected from NaClO3, NaBrO3 and NaIO3; (4) water; ( b) contacting the substrate with the aqueous reaction solution for a time sufficient to oxidize the surface of the substrate thereby forming an oxide thin film cobalt conversion coating which imparts corrosion resistance and paint adhesion to the substrate. Also disclosed is a chemical conversion coating solution for the industrial scale production of oxide thin film cobalt conversion coatings on aluminum or aluminum alloy substrates, said solution comprising an aqueous reaction solution, free of triethanolamine, by the following Reaction preparation of materials: (1) a water-soluble divalent cobalt salt CoX2, where X=Cl, Br, NO3, CN, SCN, 1 / 3PO4, 1 / 2SO4, 1 / 2CO3, formate or ethyl (2) a water-soluble complexing agent selected from MeNO2, MeAc, MeFm, NH4Ac and NH4Fm, where Me is Na, K or Li; Ac is acetate; and Fm is formate (3) an accelerator selected from NaClO3, NaBrO3 and NaIO3; (4) water.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Provisional Application Serial No. 60 / 163,103, filed November 2, 1999, entitled Non-Chromium Oxide Coatings for Aluminum Substrates. technical field [0003] The technical field of this environmental quality invention is the formation of chemical conversion coatings on aluminum and aluminum alloy substrates. SUMMARY OF THE INVENTION One aspect of the present invention is an improved method of forming an oxide coating, referred to as a "cobalt conversion coating", which is chemically formed by surface oxidation of an aluminum or aluminum alloy substrate. The present invention improves the quality of the human environment by facilitating the maintenance of air and water quality. The term "aluminum" as used herein includes aluminum and aluminum alloys. Background technique [0004] The following patents are incorporat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/66C23C22/56C23C22/68C23C22/83
CPCC23C22/56C23C22/68C23C22/83
Inventor 马赛厄斯·施里弗
Owner THE BOEING CO