SHORT TIME HOT SEALING OF ANODIZED METAL SURFACES WITH SURFACTANT-CONTAINING SOLUTIONS

摘要

Process for post-sealing anodized metal surfaces, characterized in that the anodized metal is contacted with an aqueous solution for a period of between 0.5 and 2 minutes per micrometer of anodized coating thickness, which solution is at a t emperature of between 75.degree.C and its boiling point and has a pH of from 5.5 to 8.5 and which contains: (a) a total of 0.0004 to 0.05 g/l of one or more cationic, anionic or non-ioni c surfactants; and (b) a total of 0.0005 to 0.5 g/l of one or more organic acids selected from cy clic polycarboxylic acids having 3 to 6 carboxyl groups and/or phosphonic acids. Non-ionic surfactants are preferred as the surfactants while polyphosphinocarbox ylic acids are preferred as the acids. Alkali and/or alkaline earth metalcations, pre ferably Li and/or Mg ions, are optionally present in quantities of 0.0001 to 5 g/l.