Method for treating and/or coating a substrate with non-chrome materials

Inactive Publication Date: 2010-09-30
PRC DE SOTO INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to toxicity concerns associated with hexavalent chrome as well as potential governmental regulations regarding the amount of hexavalent chrome that may be

Method used

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Examples

Experimental program
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Effect test

example i

[0049]2024-T3 bare aluminum panels were cleaned by spraying with a solution of CHEMKLEEN 275, an alkaline cleaner available from PPG Industries, for two minutes at 130° F. After alkaline cleaning, the panels were rinsed thoroughly with deionized water. The panels were then immersed in an acidic solution for two minutes at 120° F. The acid solution was prepared by diluting 198.1 grams of 85% phosphoric acid, 8.5 grams of 70% nitric acid, 16.5 grams of TRITON X-100 (available from The Dow Chemical Company) and 11.1 grams of TRITON CF-10 (available from The Dow Chemical Company) to five gallons of volume with deionized water, and then neutralizing to pH 3.0 with CHEMFIL Buffer (available from PPG Industries). After treatment in the acid solution, the panels were rinsed thoroughly with deionized water and blown dry with a warm air blowoff.

[0050]The panels were then electrocoated in an electrodeposition bath (described below) after the bath was subjected to 50% ultrafiltration. The elect...

example ii

[0054]2024-T3 bare aluminum panels were cleaned by spraying with a solution of CHEMKLEEN 275, an alkaline cleaner available from PPG Industries, for two minutes at 130° F. After alkaline cleaning, the panels were rinsed thoroughly with deionized water. The panels were then immersed in an acidic solution for two minutes at 120° F. The acid solution was prepared by diluting 198.1 grams of 85% phosphoric acid, 8.5 grams of 70% nitric acid, 16.5 grams of TRITON X-100 (available from The Dow Chemical Company) and 11.1 grams of TRITON CF-10 (available from The Dow Chemical Company) to five gallons of volume with deionized water, and then neutralizing to pH 3.0 with CHEMFIL Buffer (available from PPG Industries). After treatment in the acid solution, the panels were rinsed thoroughly with deionized water. The panels were then immersed in a solution of fluorozirconic acid for two minutes at 100° F. The acid bath was prepared by diluting 16.6 grams of 45% fluorozirconic acid to five gallons ...

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PUM

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Abstract

The present invention is directed to a method for coating a substrate comprising: (a) applying a caustic cleaner onto at least a portion of the substrate; (b) rinsing at least a portion of the substrate that was subjected to step (a) with water; (c) applying an acid cleaner onto at least a portion of the caustically cleaned substrate; (d) rinsing at least a portion of the substrate that was subjected to step (c) with water; and (e) applying a conversion coating comprising zirconium onto at least a portion of the acid cleaned substrate; and wherein at least one of the materials used in steps (c) and (e) is substantially chrome free. The present invention is also directed to a substrate, such as an aluminum substrate, that has been coated using the aforementioned method.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH[0001]This invention was made with Government support under Contract No. FA8650-05-C-5010 awarded by the United States Air Force Research Laboratory. The United States Government may have certain rights in this invention.FIELD OF THE INVENTION[0002]The present invention relates generally to a method for treating and / or coating a substrate with non-chrome materials.BACKGROUND INFORMATION[0003]Conventional pretreatment and primer coating compositions which are used in the aerospace industry contain chrome, such as hexavalent chrome, in order to impart corrosion resistance to the substrate onto which these coatings are deposited. However, due to toxicity concerns associated with hexavalent chrome as well as potential governmental regulations regarding the amount of hexavalent chrome that may be used in a coating, there is a need to reduce and / or eliminate that use of hexavalent chrome in pretreatment and primer coatings that are used in t...

Claims

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Application Information

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IPC IPC(8): C23C22/78C23C28/00C22C21/00
CPCC09D5/4442C23G1/22C23G1/125C23C22/78C23G1/00
Inventor KARABIN, RICHARD F.KAYLO, ALAN J.MCMILLEN, MARK W.MILES, MICHELLE S.PEFFER, ROBIN M.RAKIEWICZ, EDWARD F.WILSON, CRAIG A.
Owner PRC DE SOTO INT INC
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