# US 5,344,674 A · Composition and method for corrosion inhibition utilizing an epoxy resin, an amine curing agent, an alcohol and optionally a hydrocarbon diluent > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,344,674 A - Document ID: US5344674A - Status: Granted - Kind: A - Application number: 08/044,316 - Filed: 1993-04-07 - Granted: 1994-09-06 - Earliest claimed: 1980-08-27 - Assignees: Phillips Petroleum Company - Inventors: Yulin Wu - Web page: https://patentgrep.com/patent/US5344674A ## CPC - C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract A composition is provided which, when applied to a metal surface, forms a corrosion-inhibiting film thereon. The composition comprises an epoxy resin, an effective amount of a curing agent for the epoxy resin, an alcohol, and a hydrocarbon diluent. The composition is applied by contacting the metal surface with the composition as one solution or as a hydrocarbon solution of the epoxy resin and a solution comprising the alcohol and the curing agent. The composition is particularly useful in the treatment of down-well metal surfaces in oil and gas wells to inhibit the corrosion of the metal. ## Claims ### Claim 1 A method for treating a metal surface to inhibit corrosion thereof, comprising contacting the metal surface with a composition comprising: (a) an epoxy resin; (b) an amine curing agent selected from the group consisting of N-coco-1,3 diaminopropane, tallowamine, octylamine, dodecylamine, hexadecylamine, oleyamine, soyaamine, dicocoamine, dihydrogenated tallowamine, and cocoamine wherein an equivalent ratio of curing agent to epoxy resin of greater than shout 1.5: 1 to about 5:1 exists; (c) an aromatic hydrocarbon diluent present in at least an amount sufficient to maintain the composition in an essentially fluid state; and (d) an alcohol selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, n-butanol, n-pentanol, n-hexanol, n-heptanol and combinations of any two or more thereof, wherein said alcohol is present in an amount of about 10 to about 60 weight percent of the composition and wherein said composition is contacted with the metal surface for a time sufficient to form a corrosion-inhibiting film thereon. ### Claim 2 (depends on 1) The method according to claim 1 wherein the epoxy resin is the reaction product of epichlorohydrin and a polyhydric phenyl. ### Claim 3 (depends on 2) The method of claim 2 wherein the polyhydric phenyl is bisphenol A and the epoxy resin has an epoxide equivalent within the range of 185 to 192. ### Claim 4 (depends on 1) The method according to claim 1 wherein the aromatic hydrocarbon diluent is selected from the group consisting of isomeric xylenes, toluene, benzene, naphtha, cyclohexylbenzene, fuel oil diesel oil, heavy aromatic oils, Stoddart solvent, crude oil, and condensate from gas wells. ### Claim 5 (depends on 1) The method of claim 1 wherein the aromatic hydrocarbon diluent is xylene. ### Claim 6 (depends on 1) The method of claim 1 wherein the metal surface is contacted at a temperature of at least about 300.degree. F. and a pressure of at east about 6000 psig. ### Claim 7 (depends on 1) The method of claim 1 wherein the metal surface is contacted sequentially by a first solution comprising the curing agent and the alcohol selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, n-butanol, n-pentanol, n-hexanol, n-heptanol, and combinations of any two or more thereof, and a second solution comprising the epoxy resin and the aromatic hydrocarbon diluent. ### Claim 8 (depends on 1) The method of claim 1 wherein said amine curing agent is selected from the group consisting of N-coco-1,3 diaminopropane, tallowamine, and cocoamine. ### Claim 9 (depends on 1) The method of claim 1 wherein the alcohol is present in an amount of about 20 to about 30 weight percent, based on the weight of the composition. ### Claim 10 (depends on 9) The method according to claim 9 wherein the epoxy resin is the reaction product of epichlorohydrin and a polyhydric phenyl. ### Claim 11 (depends on 10) The method of claim 10 wherein the polyhydric phenyl is bisphenol A and the epoxy resin has an epoxide equivalent within the range of 185 to 192. ### Claim 12 (depends on 9) The method according to claim 9 wherein the aromatic hydrocarbon diluent is selected from the group consisting of benzene, toluene, xylene and naphtha. ### Claim 13 (depends on 9) The method of claim 9 wherein the aromatic hydrocarbon diluent is xylene.