PROCESS FOR TREATMENT OF ALUMINUM SURFACES BY OXIDATION FOLLOWED BY DENSIFICATION

摘要

According to this process, the densification is carried out in aqueous solutions at temperatures between 90 degrees C and the boiling point, having a pH of 4 to 8, containing cycloaliphatic or aromatic polycarboxylic acids which may contain heteroatoms and containing 4 to 6 carboxyl groups per molecule or water-soluble salts of these acids, at a rate of 0.0005 to 0.2 g / l.