US20110006264A1 - Corrosion inhibitor - Google Patents
Corrosion inhibitor Download PDFInfo
- Publication number
- US20110006264A1 US20110006264A1 US12/677,467 US67746708A US2011006264A1 US 20110006264 A1 US20110006264 A1 US 20110006264A1 US 67746708 A US67746708 A US 67746708A US 2011006264 A1 US2011006264 A1 US 2011006264A1
- Authority
- US
- United States
- Prior art keywords
- acid
- glycerol
- triol
- diol
- corrosion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/12—Oxygen-containing compounds
- C23F11/122—Alcohols; Aldehydes; Ketones
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
Definitions
- the present invention concerns the discovery that a diol or triol or as mixture thereof provides a corrosion-reducing or inhibiting effect when added to acids or acid containing compositions used in metal or metallic equipment in production factories or plants for reducing or inhibiting microbial growth.
- Such factories or plants may be factories or plants for silage of grass, ensilage of fish and/or fish products, continued treatment/ensilage of slaughterhouse waste and food waste or in drinking facilities for farm house animals such as poultry or pigs.
- Tanneries, metallurgic industry and pulp mills are other examples of factories or plants where large amounts of acids are used.
- Organic acids have many beneficial effects when it comes to controlling microbial growth. They are thus frequently used for the preservation of organic materials. Propionic acid is used as a grain preservative, for silage of grass and as a feed additive. Formic acid is used in ensilage of fish, slaughterhouse waste, food waste and grass, and also in pig and chicken feed. Acetic acid is used for conservation of fish. Benzoic acid is used for fish ensilage. Other acids, or mixture of acids, are also used. Organic acids are also used in the drinking water for pigs and poultry, among others. The addition of organic acids to compound feed for pigs, sheep, goats, poultry, cattle, horses, dogs, cats and fur-bearing animals has an efficacious effect on their growth and health. Further, the acid addition to compound feed reduces the amount of consumed compound feed per kg of growth without the increased growth affecting the quality of the meat. This reduces feed cost by reducing the feeding period and promoting better housing utilization.
- Strong acids like sulfuric acid, sulfurous acid and hydrochloric acids are used in many processes. Tanning, metallurgy and pulping are just a few examples.
- diol any organic compound with at two hydroxyl group, e.g. ethylene glycol or propylene glycol.
- triol is meant any organic compound with three hydroxyl groups, e.g. glycerol.
- Diols and triols can be produced by fermentation, by hydrolysis or by trans-esterification.
- Glycerol is produced in large quantities from the saponification of fats and the trans-esterification of fats to fatty acid methyl esters during biodiesel production.
- the diol or triol is added in quantities from 10 to 90% of the final mixture with the acids, preferably from 40 to 60%.
- FR 2 391 261A
- the advantages of simple diols and triols are several. They are cheaper. They are liquid at room temperature, and thus easier to use in any formulation. With the use of a diol like glycol or the triol glycerol we are not using scarce food resources as chemical raw materials.
- Glycerol has been shown to reduce skin corrosion in a formic acid that has been partly neutralised with ammonia (NO 307 591 B). We here show that diols or triols also function as a corrosion inhibitor for metals without any neutralisation of the acids.
- Carbon steel coupons C1018 were used for the corrosion tests.
- the coupons were sonicated in acetone for 10 minutes, then dried in a heating cabinet, cooled in a desiccator and weighed. They were hung in polypropylene strips inside the test bottles filled with acid and the added corrosion inhibitor. The bottles were sealed with plastic film to prevent evaporation of the acid. The test bottles were placed on magnetic stirrers to prevent diffusion gradients within the solution. After 3 days the steel coupons were removed form the bottles and washed with warm water and acetone before they were dried in a heating cabinet, cooled in a desiccator and weighed. All experiments were done in duplicate and the average corrosion rates are given.
- glycerol is at least as effective as the commercially used lignosulfonates.
- glycerol is at least as effective as the commerically used lignosulfonates.
- glycerol is effective for several mineral acids and organic acids.
Abstract
It has surprisingly been discovered that simple diols and triols work as corrosion inhibitors in concentrated organic and inorganic acids, e.g. used as additives in metallic equipment in factories and plants. These corrosion inhibitors are cheap and readily available in large quantities. The diol and triol also reduces evaporation of the acid, and thus improves the working environment.
Description
- The present invention concerns the discovery that a diol or triol or as mixture thereof provides a corrosion-reducing or inhibiting effect when added to acids or acid containing compositions used in metal or metallic equipment in production factories or plants for reducing or inhibiting microbial growth. Such factories or plants may be factories or plants for silage of grass, ensilage of fish and/or fish products, continued treatment/ensilage of slaughterhouse waste and food waste or in drinking facilities for farm house animals such as poultry or pigs. Tanneries, metallurgic industry and pulp mills are other examples of factories or plants where large amounts of acids are used.
- Organic acids have many beneficial effects when it comes to controlling microbial growth. They are thus frequently used for the preservation of organic materials. Propionic acid is used as a grain preservative, for silage of grass and as a feed additive. Formic acid is used in ensilage of fish, slaughterhouse waste, food waste and grass, and also in pig and chicken feed. Acetic acid is used for conservation of fish. Benzoic acid is used for fish ensilage. Other acids, or mixture of acids, are also used. Organic acids are also used in the drinking water for pigs and poultry, among others. The addition of organic acids to compound feed for pigs, sheep, goats, poultry, cattle, horses, dogs, cats and fur-bearing animals has an efficacious effect on their growth and health. Further, the acid addition to compound feed reduces the amount of consumed compound feed per kg of growth without the increased growth affecting the quality of the meat. This reduces feed cost by reducing the feeding period and promoting better housing utilization.
- Strong acids like sulfuric acid, sulfurous acid and hydrochloric acids are used in many processes. Tanning, metallurgy and pulping are just a few examples.
- There are a number of problems, however, with using acids, and in particular strong acids such as formic acid or mineral acids, including the corrosion of the equipment. Acids are corrosive and yearly corrosion from handling these acids costs millions of dollar. There is considerable corrosion on storage tanks, pipes, valves and the mixing equipment in the production line for pelleted feed in particular. This drives up the operating costs and leads to the added burden of increased maintenance and system monitoring.
- There are also problems with using volatile for those handling the product. Formic acid is particularly corrosive to skin and can cause damage from etching, which is why it full body protection is needed. As an example during pelleting process the temperature rises to 80-95 ° C., and some of the acid will evaporate. This leads to evaporation of some of the acid, the vapours of which can be dangerous on inhalation. Loss of acid through evaporation will not only cause environmental problems, but also have an economic cost.
- Previously some of the adverse effects have been relieved by adding a polymeric strong acid such as lignosulfonic acid or its salt (Patent WO 00/27220, PCT/NO99/00309).
- In the present invention the above-mentioned problems associated with the use of acids have been reduced by adding a diol or triol, in particular glycerol. Surprisingly, it has been shown that the reduced corrosion rates goes far beyond that expected from a dilution of the acid.
- By diol is meant any organic compound with at two hydroxyl group, e.g. ethylene glycol or propylene glycol. By triol is meant any organic compound with three hydroxyl groups, e.g. glycerol. Diols and triols can be produced by fermentation, by hydrolysis or by trans-esterification. Glycerol is produced in large quantities from the saponification of fats and the trans-esterification of fats to fatty acid methyl esters during biodiesel production.
- The diol or triol is added in quantities from 10 to 90% of the final mixture with the acids, preferably from 40 to 60%.
- Sugar and sugar alcohols have previously been described as corrosion inhibitors (FR is 2 391 261A). The advantages of simple diols and triols are several. They are cheaper. They are liquid at room temperature, and thus easier to use in any formulation. With the use of a diol like glycol or the triol glycerol we are not using scarce food resources as chemical raw materials.
- Glycerol has been shown to reduce skin corrosion in a formic acid that has been partly neutralised with ammonia (NO 307 591 B). We here show that diols or triols also function as a corrosion inhibitor for metals without any neutralisation of the acids.
- The following examples are meant to illustrate the invention without limiting its scope in any way.
- Carbon steel coupons C1018 were used for the corrosion tests. The coupons were sonicated in acetone for 10 minutes, then dried in a heating cabinet, cooled in a desiccator and weighed. They were hung in polypropylene strips inside the test bottles filled with acid and the added corrosion inhibitor. The bottles were sealed with plastic film to prevent evaporation of the acid. The test bottles were placed on magnetic stirrers to prevent diffusion gradients within the solution. After 3 days the steel coupons were removed form the bottles and washed with warm water and acetone before they were dried in a heating cabinet, cooled in a desiccator and weighed. All experiments were done in duplicate and the average corrosion rates are given.
- Corrosion rates, CR (mm/year), were determined from the weight loss of the steel coupons using this equation:
-
-
- ρSteel =7,718 g/cm3
- Surface area =27, 2 cm2
- The results from the different tests are shown in the tables below.
-
TABLE 1 The effect of glycerol concentration for a strong organic acid. Corrosion Improve- Composition rate/mm/year ment/% 10% water - 90% formic acid 6.7 — 10% glycerol - 90% formic acid 4.1 38.8 25% water - 75% formic acid 5.0 — 25% glycerol - 75% formic acid 3.2 36.0 50% water - 50% formic acid 7.5 — 50% lignosulfonate solution - 50% formic acid 2.8 62.7 50% glycerol - 50% formic acid 1.3 82.7 - We see that at all concentrations glycerol is at least as effective as the commercially used lignosulfonates.
-
TABLE 2 The effect of glycerol concentration for a weak organic acid. Corrosion Improve- Composition rate/mm/year ment/% 10% water - 90% propionic acid 4.52 — 10% glycerol - 90% propionic acid 0.70 84.5 25% water - 75% propionic acid 5.57 — 25% lignosulfonate solution - 75% 0.55 90.1 propionic acid 25% glycerol - 75% propionic acid 0.06 99.0 50% water - 50% propionic acid 2.80 — 50% lignosulfonate solution - 50% 1.15 58.9 propionic acid 50% glycerol - 50% propionic acid 0.031 98.9 - We see that at all concentrations glycerol is at least as effective as the commerically used lignosulfonates.
-
TABLE 3 The effect for various acids in a 50:50 wt % mixing ratio. Corrosion Improve- Composition rate/mm/year ment/% 50% water - 50% concentrated 114.8 — hydrochloric acid 50% glycerol - 50% concentrated 83.8 27.0 hydrochloric acid 50% water - 50% sulfuric acid (30%) 181 — 50% glycerol - 50% sulfuric acid (30%) 25.9 85.7 50% water - 50% propionic acid 2.8 — 50% glycerol - 50% propionic acid 1.2 58.9 50% water - 50% formic acid 7.5 — 50% glycerol - 50% formic acid 1.3 82.7 - We see that glycerol is effective for several mineral acids and organic acids.
-
TABLE 4 The effect of various alcohols. Corrosion Improve- Composition rate/mm/year ment/% 50% water - 50% formic acid 7.5 — 50% glycerol - 50% formic acid 1.3 82.7 50% glycol - 50% formic acid 2.9 61.7 50% ethanol - 50% formic acid 9.8 −31.1 - We see that the diol and triol shows good corrosion inhibition, while the simple alcohol does not.
- 500 ml of 50:50 wt % glycerol:formic acid, lignosulfonate:formic acid, water:formic acid solutions were made. Pure formic acid was included as a reference. Exactly 100 g of each solution was placed in 2 different beakers.
- The samples were kept at room temperature with and without stirring. The weight was recorded at 4 hours, 26 hours, 58 hours and 89 hours. The results are presented in
FIGS. 1 and 2 . We see that all additives reduce the weight loss at room temperature, but the triol is much more effective than the other additives.
Claims (9)
1. A method of inhibiting corrosion of a metal that is in contact with an organic or inorganic acid comprising mixing with said organic or inorganic acid an amount of a diol or a triol sufficient to inhibit corrosion of said metal.
2. The method according to claim 1 , wherein the diol or triol comprises 10-90% of the total mixture.
3. The method according to claim 1 , a triol is mixed with said organic or inorganic acid and said triol is glycerol.
4. The method according to claim 1 further comprising mixing an additional corrosion inhibitor.
5. The method according to claim 1 , wherein a diol is mixed with said organic or inorganic acid and said diol is glycol.
6. A composition comprising sulfuric acid, sulfurous acid, hydrochloric acid, or formic acid and a diol.
7. The composition according to claim 6 , wherein said diol is glycol.
8. A composition comprising sulfuric acid, sulfurous acid, hydrochloric acid, or formic acid and a triol.
9. The composition according to claim 8 , wherein said triol is glycerol.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20074660 | 2007-09-13 | ||
NO20074660 | 2007-09-13 | ||
PCT/NO2008/000329 WO2009035341A1 (en) | 2007-09-13 | 2008-09-15 | Corrosion inhibitor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110006264A1 true US20110006264A1 (en) | 2011-01-13 |
Family
ID=40452213
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/677,467 Abandoned US20110006264A1 (en) | 2007-09-13 | 2008-09-15 | Corrosion inhibitor |
Country Status (7)
Country | Link |
---|---|
US (1) | US20110006264A1 (en) |
EP (1) | EP2205776A4 (en) |
JP (1) | JP2010539329A (en) |
CN (1) | CN101878326A (en) |
AU (1) | AU2008297654A1 (en) |
BR (1) | BRPI0816974A8 (en) |
WO (1) | WO2009035341A1 (en) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US180795A (en) * | 1876-08-08 | Improvement in music-stands | ||
US1533622A (en) * | 1921-12-28 | 1925-04-14 | Buhler John J Varn | Rust-removing compound |
US2603622A (en) * | 1948-10-01 | 1952-07-15 | Berger Heinrich | Halogen containing resin stabilized with an acetylene alcohol |
US3004925A (en) * | 1959-03-18 | 1961-10-17 | Air Reduction | Corrosion inhibition |
US3349043A (en) * | 1966-01-19 | 1967-10-24 | Manning Dev Corp | Methods and compositions for controlling oxidation of metal surfaces |
US3772208A (en) * | 1971-08-31 | 1973-11-13 | Air Prod & Chem | Corrosion inhibitor containing the ethynylation reaction product of butyraldehyde with acetylene |
US5983756A (en) * | 1997-11-19 | 1999-11-16 | Warner-Lambert Company | Aperture razor system and method of manufacture |
US20030103865A1 (en) * | 2001-10-29 | 2003-06-05 | Libutti Bruce L. | Corrosion inhibiting composition |
US20040038840A1 (en) * | 2002-04-24 | 2004-02-26 | Shihying Lee | Oxalic acid as a semiaqueous cleaning product for copper and dielectrics |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB683638A (en) * | 1949-05-26 | 1952-12-03 | Ethicon Suture Lab Inc | Improvements in pickling bath |
IN166983B (en) * | 1985-02-11 | 1990-08-18 | Henkel Corp | |
US5893756A (en) * | 1997-08-26 | 1999-04-13 | Lsi Logic Corporation | Use of ethylene glycol as a corrosion inhibitor during cleaning after metal chemical mechanical polishing |
NO305301B1 (en) * | 1997-09-11 | 1999-05-10 | Norsk Hydro As | Aqueous preservative |
NO307591B1 (en) * | 1998-08-14 | 2000-05-02 | Norsk Hydro As | Aqueous preservative |
US20060180795A1 (en) * | 2005-02-17 | 2006-08-17 | Mccormick David R | Stable acid inhibitor formulations with improved performance, lower toxicity and minimal environmental issues |
JP2006348324A (en) * | 2005-06-14 | 2006-12-28 | Sugimura Kagaku Kogyo Kk | Corrosion inhibitor composition, acid purification solution, and acid purification method for metal |
-
2008
- 2008-09-15 CN CN200880112431XA patent/CN101878326A/en active Pending
- 2008-09-15 US US12/677,467 patent/US20110006264A1/en not_active Abandoned
- 2008-09-15 BR BRPI0816974A patent/BRPI0816974A8/en not_active IP Right Cessation
- 2008-09-15 JP JP2010524807A patent/JP2010539329A/en active Pending
- 2008-09-15 AU AU2008297654A patent/AU2008297654A1/en not_active Abandoned
- 2008-09-15 WO PCT/NO2008/000329 patent/WO2009035341A1/en active Application Filing
- 2008-09-15 EP EP08830690A patent/EP2205776A4/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US180795A (en) * | 1876-08-08 | Improvement in music-stands | ||
US1533622A (en) * | 1921-12-28 | 1925-04-14 | Buhler John J Varn | Rust-removing compound |
US2603622A (en) * | 1948-10-01 | 1952-07-15 | Berger Heinrich | Halogen containing resin stabilized with an acetylene alcohol |
US3004925A (en) * | 1959-03-18 | 1961-10-17 | Air Reduction | Corrosion inhibition |
US3349043A (en) * | 1966-01-19 | 1967-10-24 | Manning Dev Corp | Methods and compositions for controlling oxidation of metal surfaces |
US3772208A (en) * | 1971-08-31 | 1973-11-13 | Air Prod & Chem | Corrosion inhibitor containing the ethynylation reaction product of butyraldehyde with acetylene |
US5983756A (en) * | 1997-11-19 | 1999-11-16 | Warner-Lambert Company | Aperture razor system and method of manufacture |
US20030103865A1 (en) * | 2001-10-29 | 2003-06-05 | Libutti Bruce L. | Corrosion inhibiting composition |
US20040038840A1 (en) * | 2002-04-24 | 2004-02-26 | Shihying Lee | Oxalic acid as a semiaqueous cleaning product for copper and dielectrics |
Also Published As
Publication number | Publication date |
---|---|
EP2205776A1 (en) | 2010-07-14 |
CN101878326A (en) | 2010-11-03 |
JP2010539329A (en) | 2010-12-16 |
BRPI0816974A2 (en) | 2015-03-24 |
WO2009035341A1 (en) | 2009-03-19 |
EP2205776A4 (en) | 2012-02-29 |
AU2008297654A1 (en) | 2009-03-19 |
BRPI0816974A8 (en) | 2016-01-19 |
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