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Corrosion resistant coatings for aluminum and aluminum alloys

An aluminum alloy and coating technology, which is applied in the fields of aluminum alloy and aluminum-coated base materials, corrosion-resistant compositions, treated aluminum, surface treatment and coating compositions, can solve problems such as carcinogenicity, high toxicity, and high cost

Inactive Publication Date: 2004-08-11
美国海军部
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is extremely toxic and known to be carcinogenic
But this approach is costly and can constitute a major cost factor in the overall metal treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] An acidic aqueous solution for treating aluminum and aluminum alloys to form a corrosion-resistant coating on their surfaces, comprising (per liter of solution): about 6.0 grams of trivalent chromium sulfate, about 8.0 grams of potassium hexafluorozirconate, and about 1.0 grams of cellulose thickened agent and about 1.0 g of water-soluble nonionic surfactant.

Embodiment 2

[0016] An acidic aqueous solution for treating aluminum and aluminum alloys to form a corrosion-resistant coating on their surface, including (per liter of solution): about 3.0-12 grams of tribasic chromium sulfate, about 3-9 grams of sodium hexafluorozirconate, and about 0.5-2.0 grams Methylcellulose thickener.

Embodiment 3

[0018] An acidic aqueous solution for treating aluminum and aluminum alloys to form a corrosion-resistant coating, including (per liter of solution): about 5.0-7.0 grams of potassium tribasic sulfate-chromium compound (KCr(SO 4 ) 2 ), about 6-8 grams of potassium hexafluorozirconate, and about 0.5-2.0 grams of methylcellulose thickener.

[0019] Prior to the formation of the trivalent chromium coating (from Example 1), the aluminum material was washed with an alkaline phosphoric acid cleaner in the temperature range of 100-140°F for approximately 15 minutes, rinsed under the tap and then immersed in a non-chromate normal Leave in the reducer for about 15-20 minutes and then rinse under the tap. Under normal circumstances, the clean substrate is immersed in the acidic trivalent chromium sulfate solution for about 30 seconds to 60 minutes, then rinsed in water and left to dry. In another treatment process, the substrate is immersed in a cleaner (Turco 4215) at a temperature of...

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PUM

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Abstract

This invention is for the protection and surface treatment of aluminum, aluminum alloys and coated aluminum substrates against corrosion. The aluminum substrates are treated with an acidic aqueous solution containing small but effective amounts of at least one trivalent chromium salt such as a trivalent chromium sulfate, at least one alkali metal hexafluorazirconate such as potassium hexafluorozirconate in combination with small but effective amounts of at least one water soluble or dispersible thickening agent such as a cellulose compound and at least one water soluble surfactant. The corrosion resistant aluminum substrates of this invention have improved adhesion for overlaying coatings e.g. paints and a lower electrical resistance contact.

Description

[0001] The patent contained herein was invented by an employee of the United States Federal Government and may be used and manufactured by or for the Federal Government without compensation. technical field [0002] The present invention relates to the protection, surface treatment and coating of metallic materials, to surface treatment and coating compositions used as solutions or dispersed phases, and to methods of using these compositions to treat aluminum, aluminum alloys and aluminum-coated substrate materials. These compositions applied to metal surfaces provide improved corrosion resistance, adhesion when overcoated (eg, paint), and the ability to maintain low electrical contact resistance in corrosive environments. In particular, the present invention relates to a novel corrosion-resistant composition and its application process on aluminum, aluminum alloys, and aluminum-coated substrates, said composition comprising an effective amount of at least one water-soluble tri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/10B05D7/14C09D5/08C09D5/12C23C22/30C23C22/34C23C22/83
CPCC23C2222/10C09D5/084C09D5/12C23C22/34C23C22/83
Inventor C·A·马佐多夫M·J·凯恩J·L·格林
Owner 美国海军部
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