CONVERSION FILMS BASED ON LAMELLAR DOUBLE-HYDROXIDES FOR ACTIVE PROTECTION AGAINST CORROSION

摘要

The present invention relates to conversion films based on lamellar double hydroxides (LDHs), which are obtained by means of a simple hydrothermal process. Depending on the process conditions used and on the substrates used, micrometric differentiation of film morphology may be achieved. The films obtained for the first time exhibit the functionality of active protection against corrosion associated with the intercalation of corrosion inhibitors in the structure of the LDHs. The anticorrosion performance is due to the controlled release of inhibitors accompanied by the trapping of substrate-aggressive species (chlorides) in the LDHs. The present invention is of use for industrial application in the area of protection of metal substrates against corrosion.