Patent ID: 6447665
Filing Date: 2002-09-10
Classification: C25D

Abstract:
A process for sealing an anodized aluminum surface, said process comprising operations of:(I) bringing the anodized aluminum surface into contact for not more than 30 minutes at a temperature not greater than 75Â° C. with a liquid first sealing composition having a pH value of at least 6.7 and comprising water and: (A) a concentration of lithium cations; and (B) a concentration of fluoride anions, said first sealing composition not comprising more than about 5.0 ppm of dispersed or dissolved silicon atoms; and (II) after completion of operation (I), bringing the anodized aluminum surface as modified by operation (I) into contact at a temperature of at least 82Â° C. with a second sealing composition comprising steam or liquid water.