US2013081950A1PendingUtilityA1

Acid cleaners for metal substrates and associated methods for cleaning and coating metal substrates

38
Individually held — no corporate assignee on recordPriority: Sep 30, 2011Filed: Sep 30, 2011Published: Apr 4, 2013
Est. expirySep 30, 2031(~5.2 yrs left)· nominal 20-yr term from priority
Inventors:Brian C. OkerbergSusanna FraleyTerri Ziegler
C25D 13/20C25D 13/10C09D 5/084C25D 13/04C09D 5/448
38
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Claims

Abstract

Disclosed are methods for cleaning and coating metal substrates, and the coated substrate formed therein, that include contacting the substrate with an acid and then contacting the cleaned substrate with an electrodepositable coating composition comprising a film forming polymer and a corrosion inhibitor.

Claims

exact text as granted — not AI-modified
We claim: 
     
         1 . A method comprising:
 (a) contacting a substrate with an acid; and then (b) contacting the substrate with an electrodepositable coating composition comprising (i) a film-forming polymer; and (ii) a corrosion inhibitor;   with the proviso that the method does not comprise contacting the substrate with a pretreatment composition prior to step (b).   
     
     
         2 . The method of  claim 1 , wherein said corrosion inhibitor comprises a rare earth metal, a lanthanide, or combinations thereof. 
     
     
         3 . The method of  claim 1 , wherein said corrosion inhibitor comprises a source of yttrium. 
     
     
         4 . The method of  claim 3 , wherein said source of yttrium comprises an yttrium compound. 
     
     
         5 . The method of  claim 1 , wherein said corrosion inhibitor comprises a source of cerium. 
     
     
         6 . The method of  claim 1 , wherein said source of cerium comprises a cerium compound. 
     
     
         7 . The method of  claim 1 , wherein said corrosion inhibitor comprises a source of yttrium and a source of cerium. 
     
     
         8 . The method of  claim 1 , wherein said electrodepositable coating composition further comprises (iii) a silane that does not contain an ethylenically unsaturated double bond 
     
     
         9 . The method of  claim 1 , wherein said acid comprises an organic acid. 
     
     
         10 . The method of  claim 1 , wherein said acid comprises a mineral acid. 
     
     
         11 . The method of  claim 1 , wherein said acid comprises an organic acid, a mineral acid or mixtures thereof. 
     
     
         12 . The method of  claim 9 , wherein said organic acid comprises a carboxylic acid. 
     
     
         13 . The method of  claim 9 , wherein said organic acid comprises citric acid. 
     
     
         14 . The method of  claim 1  further comprising (c) contacting the substrate with an alkaline cleaner prior to steps (a) and (b). 
     
     
         15 . The method of  claim 1  further comprising (c) contacting the substrate with an alkaline cleaner prior to step (b) and after step (a). 
     
     
         16 . A coated substrate formed in accordance with the method of  claim 1 . 
     
     
         17 . A coated substrate formed in accordance with the method of  claim 8 . 
     
     
         18 . A method for coating a substrate comprising:
 (a) contacting the substrate with an acid;   (b) contacting the substrate with an alkaline cleaner; and then   (c) contacting the substrate with an electrodepositable coating composition comprising (i) a film-forming polymer; and (ii) a corrosion inhibitor;   with the proviso that the method does not comprise contacting the substrate with a pretreatment composition prior to step (b).   
     
     
         19 . The method of  claim 1 , wherein said corrosion inhibitor comprises a rare earth metal, a lanthanide, or combinations thereof. 
     
     
         20 . A coated substrate formed in accordance with the method of  claim 19 .

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