EP0104012A2 - Zusammensetzung und Verfahren zur gleichzeitigen Entfernung von Eisen- und Kupferablagerungen von Eisenoberflächen - Google Patents
Zusammensetzung und Verfahren zur gleichzeitigen Entfernung von Eisen- und Kupferablagerungen von Eisenoberflächen Download PDFInfo
- Publication number
- EP0104012A2 EP0104012A2 EP83304969A EP83304969A EP0104012A2 EP 0104012 A2 EP0104012 A2 EP 0104012A2 EP 83304969 A EP83304969 A EP 83304969A EP 83304969 A EP83304969 A EP 83304969A EP 0104012 A2 EP0104012 A2 EP 0104012A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- composition
- copper
- weight
- ferrous metal
- 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.)
- Withdrawn
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 75
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 58
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000010949 copper Substances 0.000 title claims abstract description 47
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 47
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 29
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 8
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 13
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims abstract description 11
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-araboascorbic acid Natural products OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 claims abstract description 11
- 150000007513 acids Chemical class 0.000 claims abstract description 11
- 239000004318 erythorbic acid Substances 0.000 claims abstract description 11
- 235000010350 erythorbic acid Nutrition 0.000 claims abstract description 11
- 229940026239 isoascorbic acid Drugs 0.000 claims abstract description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 10
- -1 alkali metal salts Chemical class 0.000 claims abstract description 9
- NVHNGVXBCWYLFA-UHFFFAOYSA-N 1,3-diazinane-2-thione Chemical compound S=C1NCCCN1 NVHNGVXBCWYLFA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 4
- 150000003863 ammonium salts Chemical class 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 28
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 24
- 239000004320 sodium erythorbate Substances 0.000 claims description 19
- 235000010352 sodium erythorbate Nutrition 0.000 claims description 19
- RBWSWDPRDBEWCR-RKJRWTFHSA-N sodium;(2r)-2-[(2r)-3,4-dihydroxy-5-oxo-2h-furan-2-yl]-2-hydroxyethanolate Chemical group [Na+].[O-]C[C@@H](O)[C@H]1OC(=O)C(O)=C1O RBWSWDPRDBEWCR-RKJRWTFHSA-N 0.000 claims description 19
- 235000019253 formic acid Nutrition 0.000 claims description 17
- 238000005260 corrosion Methods 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 claims description 14
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- 229960004275 glycolic acid Drugs 0.000 claims description 12
- 239000003112 inhibitor Substances 0.000 claims description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- 150000007524 organic acids Chemical class 0.000 claims description 5
- KFFQABQEJATQAT-UHFFFAOYSA-N N,N'-dibutylthiourea Chemical compound CCCCNC(=S)NCCCC KFFQABQEJATQAT-UHFFFAOYSA-N 0.000 claims description 4
- 125000003118 aryl group Chemical group 0.000 claims description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 3
- 150000001298 alcohols Chemical class 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 3
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 2
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 2
- 235000015165 citric acid Nutrition 0.000 claims description 2
- 239000001630 malic acid Substances 0.000 claims description 2
- 235000011090 malic acid Nutrition 0.000 claims description 2
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 claims description 2
- 235000005985 organic acids Nutrition 0.000 claims description 2
- 235000011054 acetic acid Nutrition 0.000 claims 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N pyridine Substances C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims 1
- 230000000536 complexating effect Effects 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 24
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 16
- 239000007864 aqueous solution Substances 0.000 description 10
- 238000004090 dissolution Methods 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 7
- 150000004674 formic acids Chemical class 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000012256 powdered iron Substances 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 229960001484 edetic acid Drugs 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000012085 test solution Substances 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 229960004106 citric acid Drugs 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229940013688 formic acid Drugs 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 229940099690 malic acid Drugs 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/088—Iron or steel solutions containing organic acids
Definitions
- This invention relates to a method of simultaneously removing iron and copper scales from ferrous metal surfaces, and to compositions useful therefor.
- the aqueous mixture of hydroxyacetic and formic acids has been removed from contact with a scale-containing surface after iron scales thereon have been dissolved, and a second composition containing a copper complexor has then been brought into contact with the scale-containing surface at a lower temperature to remove copper scales.
- This two-step procedure has been necessitated by the fact that the copper complexors degrade and are ineffective at temperatures above about 160°F (71 0 C).
- a composition for simultaneously removing iron and copper scales from a ferrous metal surface which comprises water; one or more organic chelating acids which dissolve iron; one or more reducing agents selected from erythorbic acid, and alkali metal salts and ammonium salts of erythorbic acid; and as copper complexor, one or both of thiourea and hexahydropyrimidine-2-thione.
- the invention also includes a method of simultaneously removing iron and copper scales from a ferrous metal surface which comprises contacting said scale-containing ferrous metal surface with a composition of the invention, and maintaing said contact for a time and at a temperature sufficient for said scales to be dissolved.
- Any organic acid, or mixture of organic acids, having low pH (a pH of less than 7 at room temperature) which chelate iron can be used in the compositions of this invention.
- suitable such acids are hydroxyacetic acid, formic acid, malic acid, citric acid, ethylenediaminetetracetic acid (EDTA), nitrilotriacetic acid, and mixtures of such acids.
- EDTA ethylenediaminetetracetic acid
- nitrilotriacetic acid and mixtures of such acids.
- a mixture of hydroxyacetic acid and formic acid is preferred.
- the organic iron chelating acid or acids utilized in the aqueous scale-removing compositions of this invention are preferably present in an amount of from 1% to 10% by weight of the compositions.
- the preferred acids, i.e. hydroxyacetic acid and formic acid, are preferably present in the aqueous compositions in a weight ratio of hydroxyacetic to formic acid of about 2:1.
- the erythorbic acid and/or salt reducing agent functions in the compositions of this invention to increase the rate of dissolution of iron by the organic chelating acid or acids utilized, whereby iron scales can be effectively removed from ferrous surfaces by the compositions at low temperatures, i.e. temperatures in the range of from about 75°F (24°C) to about 150°F (66°C).
- the reducing agents utilised in the compositions are selected from the group consisting of erythorbic acid, alkali metal salts of erythorbic acid, ammonium salts of erythorbic acid and mixtures thereof and are preferably included in the compositions in an amount in the range of from about 0.25% to about 5% by weight of the compositions.
- the reducing agent is sodium erythorbate and is present in the aqueous compositions in an amount of 1% by weight of the compositions.
- the copper complexing compounds utilized in the compositions of this invention are thiourea and hexahydro- pyrimidine-2-thione. A mixture of the two can be used.
- the copper complexor is preferably included in the aqueous composition in an amount of from 0.25% to 3% by weight of the compositions.
- the copper complexor is a mixture of hexyhydropyrimidine-2-thione and thiourea consisting of 60 parts by weight hexahydropyrimidine-2-thione and 40 parts by weight thiourea, present in the aqueous composition in an amount of about 1% by weight.
- a particularly preferred composition of this invention is comprised of water, hydroxyacetic acid present in the composition in an amount of about 2% by weight of the composition, formic acid present in the composition in the amount of about 1% by weight of the composition, sodium erythorbate present in the composition in an amount of about 1% by weight, and a mixture of 60 parts by weight hexahydropyrimidine-2-thione and 40 parts by weight thiourea present in the composition in an amount of about 1% by weight.
- ferrous metal corrosion inhibitors can be included in the compositions of this invention, as for example, dibutyl-thiourea, quaternary alkyl pyridinium salts, alkylbenzene sulfonate and heavy aromatic naphtha.
- the most preferred ferrous metal corrosion inhibitor for use in accordance with this invention is a low chloride inhibitor mixture comprised of 15% by weight heavy aromatic naphtha, 40% by weight ethylene glycol, 8% by weight dibutyl thiourea, 12% by weight acetic acid, 10% by weight alkyl pyridine, 10% by weight nonionic ethoxylated alcohol and 5% by weight ethoxylated amine.
- the corrosion inhibitor is preferably included in the aqueous composition in an amount of from about .05% to about 6% by volume of the composition.
- a composition of the present invention is brought into contact with an iron and copper scale-containing ferrous metal surface at a temperature and for a time sufficient for the scales to be dissolved by the composition and thereby removed from the surface.
- the composition containing the dissolved scales is removed from contact with the surface and disposed of in the usual manner whereby pollution of the environment does not result.
- the temperature of the aqueous composition during the contact of the scale-containing surfaces can be as low as 75°F (24°C) while still efficiently removing scale from the surfaces up to as high as about 150°F (66° C ).- At temperatures above about 150°F (66°c), degradation of the copper complexors begins to take place.
- the most preferred contact temperature is about 140°F (60°C).
- the cleaning compositions can be brought into contact with the scale-containing surfaces in a static condition, or as is preferred, the compositions can be circulated over the surfaces.
- the compositions effectively dissolve deposits containing iron and copper at temperatures in the range of from about 75°F (24°C) to about 150°F (66°C) in a single stage treatment.
- Aqueous solutions containing 2% by weight hydroxyacetic acid, 1% by weight formic acid and 0.1% by volume of a corrosion inhibitor are prepared.
- One hundred milliliter portions of the solutions are placed in glass beakers, 2 grams of powdered iron oxide (technical grade magnetite) are added thereto and dry pre-weighed 1020 mild steel corrosion coupons are placed in the solutions.
- Various quantities of sodium erythorbate are added to some of the test solutions, the solutions are heated to the temperatures given in Table 1 below and the solutions are maintained at such temperatures for time periods of six hours.
- test solutions are stirred for one minute each hour and at the termination of the six hour periods, the solutions are analyzed for dissolved iron (by atomic absorption analysis) and the weight losses of the corrosion coupons are determined. The results of these tests are given in Table I below.
- the corrosion inhibitor is a commercially available mixture comprised of 15% by weight heavy aromatic naphtha, 40% by weight ethylene glycol, 8% by weight dibutyl thiourea, 12% by weight acetic acid, 10% by weight alkyl pyridine, 10% by weight nonionic ethoxylated alcohol and 5% by weight ethoxylated amine.
- aqueous solutions containing 2% by weight hydroxyacetic acid, 1% by weight formic acid and 0.1% by volume of the corrosion inhibitor described in Example 1 are placed in glass beakers.
- Sodium erythorbate and/or copper complexor are combined with some of the solutions and 2 grams of powdered iron oxide (technical grade magnetite) and 0.1 gram of copper powder are combined with the solutions.
- Dry pre-weighed 1020 mild steel corrosion coupons are placed in the solutions and the solutions are heated and maintained at temperatures of 140°F (60°C) for time periods of six hours with one minute of stirring each hour. At the termination of the six-hour test periods, the solutions are analyzed (by atomic absorption analysis) for dissolved iron and copper and the weight losses of the corrosion coupons are determined.
- boiler tube sample A The test sections of boiler tube are cut from two boiler tube samples designated herein as boiler tube sample A and boiler tube sample B.
- the scale on boiler tube sample A consists a magnetite, copper metal and hydroxyapatite [Ca 5 (PO 4 ) 3 OH].
- the scale on boiler tube sample B consists of magnetite, copper and nickel.
- Example 1 One hundred milliliter portions of an aqueous solution containing 2% by weight hydroxyacetic acid, 1% by weight formic acid and 0.1% by volume of the corrosion inhibitor described in Example 1 are placed in three beakers. Two grams of powdered iron oxide are combined with each solution. One percent by weight sodium erythorbate and 1% by weight copper complexor (60% by weight hexahydropyrimidine-2-thione and 40% by weight thiourea) are combined with the first solution which is maintained at a tmperature of 75°F (24°C) for six hours with one minute of stirring each hour. One percent by weight copper complexor only is added to the second solution which is also maintained at 75 F (24°C) for a six-hour time period.
- sodium erythorbate and 1% by weight copper complexor (60% by weight hexahydropyrimidine-2-thione and 40% by weight thiourea) are combined with the first solution which is maintained at a tmperature of 75°F (24
- the third solution is heated to 190°F (88°C) and is maintained at such temperature for a six-hour time period. At the terminations of the six-hour time periods, the solutions are analyzed for dissolved iron. The results in these tests are shown in Table IV below.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- ing And Chemical Polishing (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42099882A | 1982-09-21 | 1982-09-21 | |
| US420998 | 1982-09-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0104012A2 true EP0104012A2 (de) | 1984-03-28 |
| EP0104012A3 EP0104012A3 (de) | 1985-08-21 |
Family
ID=23668765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83304969A Withdrawn EP0104012A3 (de) | 1982-09-21 | 1983-08-26 | Zusammensetzung und Verfahren zur gleichzeitigen Entfernung von Eisen- und Kupferablagerungen von Eisenoberflächen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0104012A3 (de) |
| CA (1) | CA1204372A (de) |
| ES (1) | ES8503728A1 (de) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2157322A (en) * | 1984-03-29 | 1985-10-23 | Diversey Limited | Removal of iron oxide deposits |
| EP0313335A1 (de) * | 1987-10-21 | 1989-04-26 | Grace Dearborn Inc. | Entfernung von Rost und Mittel hierfür |
| CN1047409C (zh) * | 1997-03-07 | 1999-12-15 | 沈阳市巨龙防腐技术研究所 | 常温铜酸洗缓蚀剂 |
| WO2005033365A1 (de) * | 2003-10-02 | 2005-04-14 | Thyssenkrupp Automotive Ag | Verfahren zum entrosten von formteilen |
| WO2006039983A1 (de) * | 2004-09-25 | 2006-04-20 | Chemetall Gmbh | Verfahren zur entfernung von laserzunder |
| CN112516793A (zh) * | 2020-11-10 | 2021-03-19 | 东华理工大学 | 一种异VC钠还原Fe(III)EDTA的方法及应用其脱除废气中NO的方法 |
| CN113337827A (zh) * | 2021-06-07 | 2021-09-03 | 山东惠中新材料科技有限公司 | 一种环保型除锈剂 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7611588B2 (en) | 2004-11-30 | 2009-11-03 | Ecolab Inc. | Methods and compositions for removing metal oxides |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3803042A (en) * | 1972-04-27 | 1974-04-09 | Halliburton Co | Composition and method for removing copper containing scales from metals |
| DE2040546B1 (de) * | 1970-08-14 | 1971-12-02 | Hagen Feldmann | Waessrige Loesung einer aliphatischen Carbonsaeure zur Entfernung von Verockerungen oder Ablagerungen |
| DE2457235A1 (de) * | 1974-12-04 | 1976-06-10 | Peter Vodicka | Verwendung von metallen und/oder wasserloeslichen chemischen verbindungen zum schutz der in sauren inhibierten loesungen vom zunder gebeizten oder von eisen-iii-haltigen belaegen chemisch gereinigten metallischen gegenstaenden und/oder geschlossenen anlagen vor dem angriff der ferrikationen und anordnung zum erreichen dieses schutzes |
-
1983
- 1983-08-26 EP EP83304969A patent/EP0104012A3/de not_active Withdrawn
- 1983-09-20 CA CA000437060A patent/CA1204372A/en not_active Expired
- 1983-09-21 ES ES525797A patent/ES8503728A1/es not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2157322A (en) * | 1984-03-29 | 1985-10-23 | Diversey Limited | Removal of iron oxide deposits |
| EP0313335A1 (de) * | 1987-10-21 | 1989-04-26 | Grace Dearborn Inc. | Entfernung von Rost und Mittel hierfür |
| CN1047409C (zh) * | 1997-03-07 | 1999-12-15 | 沈阳市巨龙防腐技术研究所 | 常温铜酸洗缓蚀剂 |
| WO2005033365A1 (de) * | 2003-10-02 | 2005-04-14 | Thyssenkrupp Automotive Ag | Verfahren zum entrosten von formteilen |
| WO2006039983A1 (de) * | 2004-09-25 | 2006-04-20 | Chemetall Gmbh | Verfahren zur entfernung von laserzunder |
| US7396417B2 (en) | 2004-09-25 | 2008-07-08 | Chemetall Gmbh | Method for removing laser scales |
| RU2405863C2 (ru) * | 2004-09-25 | 2010-12-10 | Шеметалл Гмбх | Способ удаления лазерной окалины |
| CN112516793A (zh) * | 2020-11-10 | 2021-03-19 | 东华理工大学 | 一种异VC钠还原Fe(III)EDTA的方法及应用其脱除废气中NO的方法 |
| CN113337827A (zh) * | 2021-06-07 | 2021-09-03 | 山东惠中新材料科技有限公司 | 一种环保型除锈剂 |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1204372A (en) | 1986-05-13 |
| ES525797A0 (es) | 1985-03-01 |
| EP0104012A3 (de) | 1985-08-21 |
| ES8503728A1 (es) | 1985-03-01 |
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