CORROSION INHIBITING PIGMENTS AND METHODS FOR PREPARING THE SAME

摘要

The invention relates to an active pigment comprising reservoirs of encapsulated corrosion inhibitors and/or biocides for active corrosion and/or antifouling protection of metallic and polymeric products and structures, wherein the reservoirs having average dimensions in the range 10-50000 nm comprise a porous surface/interface and a porous or empty interior and stimuli-sensitive stoppers which are capable to release an encapsulated inhibitor or biocide outside said reservoir upon action of a stimulus which is selected from the group consisting of an external electromagnetic field, changes in local pH, ionic strength and ambient temperature, wherein said stimuli-sensitive stoppers are the result from a chemical or physical interaction between encapsulated corrosion inhibitor and/or biocide or solvent/dispersing agent and an additional external compound and prevent the release of an encapsulated inhibitor or biocide towards the reservoir exterior in the absence of said stimulus. In the pigment of the invention, the stimuli-sensitive stoppers are preferably situated at the outer end of pores in a porous reservoir scaffold or in pores of a reservoir shell. Further aspects of the invention relate to methods for preparing said pigment and to a method for corrosion and/or antifouling protection using said pigment.