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Corrosion resistant trivalent chromium phosphated chemical conversion coatings
   
Document Number
US Patent 7018486
Issued Date
March 28, 2006
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Abstract
An acidic aqueous solution containing a water soluble trivalent chromium compound is provided with a additive for improving corrosion resistance and reducing precipitation of trivalent chromium over time. A suitable additive is nitrilotris (methylene) triphosphonic acid (NTMP).
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Number of Claims:
22
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Published
March 28, 2006
Application Number
10/187,179
Filed
June 27, 2002
US Classification
148/267   106/14.11 148/243
Int'l Classification
C23C   22/00   (20060101)  
Examiner
Attorney/Law Firm
Parent Case
This application is a Continuation in part Application of U.S. application Ser. No. 10/146,435, filed on May 13, 2002, now U.S. Pat. No. 6,648,986.
USPTO Field of Search
148/267   148/243   106/14.11   428/469   428/472  
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