Controlled release materials for anti-corrosion agents
AssigneeUnited States of America as represented by the Administrator of NASA
InventorsXuejun Zhang, Wenyan Li, Luz M. Calle
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Abstract
Corrosion inhibitor materials are provided that release active corrosion inhibitor compounds when they are most needed—in response to changes in conditions, including acid or basic pH, that cause corrosion or occur at the early stages of corrosion. The materials comprise particles that can be dispersed in paints and coatings for metals. The particles in some cases include ionic water-soluble anti-corrosion agents complexed to oppositely charged surfactants and entrapped in silica oxide or metal oxide gels.
Claims11
A corrosion inhibitor material comprising:
- particles comprising:
- (I) a complex comprising:
- (a) an ionic surfactant, an ionic polymer, an ionic polymer precursor, or an ionic liquid;
- and
- (b) an ionic water-soluble corrosion inhibitor;
- wherein (a) and (b) have opposite charges and (a) and (b) are bonded to one another;
- wherein the particles are embedded in the framework of:
- a solid or gel matrix structure;
- wherein the particles have (i) the property that if they are placed in an aqueous solution in an acidic pH they release some of the water-soluble corrosion inhibitor, (ii) the property that if they are placed in an aqueous solution in a basic pH they release some of the water-soluble corrosion inhibitor, or (iii) the property that if they are heated they release some of the water-soluble corrosion inhibitor.
A corrosion inhibitor material comprising:
- particles comprising:
- (I) a complex comprising:
- (a) cyclodextrin and (b) an ionic water-soluble corrosion inhibitor, bonded to (a);
- wherein particles are embedded in the framework of a solid or gel matrix structure;
- wherein the matrix structure is composed of oxides of silicon, oxides of one or more metals, or combinations thereof;
- wherein the particles have (i) the property that if they are placed in an aqueous solution in an acidic pH they release some of the water-soluble corrosion inhibitor, (ii) the property that if they are placed in an aqueous solution in a basic pH they release some of the water-soluble corrosion inhibitor, or (iii) the property that if they are heated they release some of the water-soluble corrosion inhibitor.
Dependencies are inferred from the claim text.