EP0860517A1 - Verfahren und Mittel zur Korrosionsschutzbehandlung wasserführender Metallsysteme - Google Patents
Verfahren und Mittel zur Korrosionsschutzbehandlung wasserführender Metallsysteme Download PDFInfo
- Publication number
- EP0860517A1 EP0860517A1 EP98101043A EP98101043A EP0860517A1 EP 0860517 A1 EP0860517 A1 EP 0860517A1 EP 98101043 A EP98101043 A EP 98101043A EP 98101043 A EP98101043 A EP 98101043A EP 0860517 A1 EP0860517 A1 EP 0860517A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- silicates
- water
- phosphate
- phosphates
- 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.)
- Granted
Links
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
- C23F11/18—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 inorganic inhibitors
- C23F11/187—Mixtures of inorganic inhibitors
- C23F11/188—Mixtures of inorganic inhibitors containing phosphates
Definitions
- the invention relates to a method for corrosion protection treatment of water-bearing systems, especially from low alloyed or unalloyed steel, made of copper or lead, as well as means and devices for carrying out the method.
- EP 102587-B1 describes a method for Corrosion protection treatment of water-bearing systems with additives of phosphates and / or silicates, the water Sodium or potassium carbonates or bicarbonates in combination with these phosphates and / or silicates added will.
- an agent is dosed into the water flow which trisodium phosphate, sodium silicate and sodium hydrogen carbonate contains.
- EP 510989-A1 claims an agent for preventing the corrosion of cast iron in drinking water systems, which contains about three parts by weight of orthophosphate and one part by weight of sodium silicate, expressed as PO 4 or SiO 2 .
- This agent By adding this agent to the drinking water, the precipitation of dissolved manganese and iron ions is to be prevented and the content of dissolved lead from the corrosion of lead pipes is to be reduced.
- This publication confirms the synergistic effect of a preparation with phosphate and silicate compared to pure phosphate already reported by D. Liebich (Forumgate-Hygiene 40 (1989) pages 102 to 107).
- the weight quantities of phosphate and silicate to be added in order to optimally utilize the synergistic effect are not constant, but rather depend, for example, on the type of water and on the operating conditions and the type of corrosion protection desired.
- a high content of neutral salts such as chlorides and sulfates with low acid capacity promotes corrosion (DIN 50930 Part 2, Chapter 5.2).
- a cover layer of iron hydroxides formed in the stationary flow mode which in itself slows down the corrosion process, can re-form in the case of non-steady-state operation, ie in the absence of oxygen (A. Kuch et al., Gwf-wasser / abement 127 (1986), pages 621-629 ).
- every addition to drinking water must be limited to the necessary minimum. With regard to all flow systems, this applies in particular to phosphate, since it can lead to undesirable and harmful over-fertilization of surface waters via the waste water.
- the object of the invention is a method for anti-corrosion treatment water-bearing metal systems by dosing a combination of phosphates and silicates in the water flow specify with which an optimal ratio at all times from silicate to phosphate while minimizing the Amount of phosphate can be observed.
- phosphates and silicates can be added to any of these happen in a manner known to those skilled in the art. Both can be finely divided solid form through known mechanical metering devices be added. It is also possible to use the finely divided solid active ingredients before use by means of a to granulate a suitable, possibly water-soluble binder.
- the silicates and the phosphates are preferred as concentrated aqueous solutions used. It goes without saying also possible a component in solid form as described and use the other as a solution.
- Preferred silicate solutions contain alkali metal silicates, especially with a module from 1.8 to 3.5.
- module denotes the molar ratio of silicon dioxide to alkali oxide.
- Sodium silicate with a modulus of 2.6 to 3.5 is particularly preferred.
- Aqueous silicate solutions with a content of at least 20% by weight of SiO 2 are advantageous.
- the silicate solution contains a water-soluble carbonate or bicarbonate, for example sodium or potassium.
- the amount of this carbonate or bicarbonate is limited by its solubility in the silicate solution. It is preferably - expressed as CO 3 - at least one tenth, particularly preferably at least one fifth of the weight fraction of SiO 2 in the solution.
- the aqueous phosphate solution preferably has a concentration of at least 20% by weight of PO 4 .
- Suitable phosphates are orthophosphates, in particular sodium orthophosphate, potassium orthophosphate, oligophosphates such as sodium and potassium diphosphate, sodium and potassium triphosphate, polyphosphates such as sodium and potassium polyphosphate or mixtures thereof. Solutions which contain both ortho- and oligo- and / or polyphosphates are preferred. The latter can convert to orthophosphates and serve as an orthophosphate reservoir for the protection of parts of the metal system that are remote from the plant, in particular unsteady-operated end strands, when the original orthophosphate for covering layer formation in the parts near the plant has been largely used up.
- Preferred solutions contain 25 to 75% of the total phosphate as orthophosphate and 25 to 75% in the form of one or more oligo- or polyphosphates, each calculated as a proportion by weight of the total PO 4 .
- the separate dosing of the phosphates and silicates can by means of multi-component metering devices known per se happen. These devices can be placed anywhere arranged upstream in front of the metal system to be protected be. Both components can be in the same place be added to the current, for example by means of opposite Nozzles. However, a component can also be added first and in the course of the current, for example by means of static internals or with the help of stirrers, mixed with the water flow and then the other component is added. in the the latter case is preferably first phosphate and then silicate added. In this way it can be used with some waters occurring when introducing the alkaline silicate component Precipitation of alkaline earth carbonates, which leads to annoying incrustation the dosing device can be avoided.
- the metered amounts are preferably such that the concentration of the phosphate in the water stream is 0.1 to 6.7 mg PO 4 / l and that of the silicate is 1 to 40 mg SiO 2 / l.
- the metered amounts of the silicate and phosphate solution are preferably adjusted or regulated independently of one another.
- the basis for the setting variables can be, for example, preliminary tests with the given wall materials of the metallic water-carrying system. However, these quantities can also be determined according to the corrosive aggressiveness of the water that can be derived from the water analysis.
- the doses of the silicates or phosphates over time changed can, for example, provide optimal protection against corrosion be maintained when water quality changes.
- the dosage, in particular of the phosphate are withdrawn if there is in the Metal system an adequate corrosion-resistant top layer has trained. This is both in terms of environmental protection as well as economical in terms of economy.
- a silicate solution suitable for carrying out the process according to the invention contains, in aqueous solution, alkali silicates in a concentration corresponding to at least 20% by weight SiO 2 and alkali metal carbonates and hydrogen carbonates in a concentration corresponding to at least 0.1% by weight CO 3 , preferably at least one tenth, particularly preferably at least one fifth of the weight fraction SiO 2 .
- a phosphate solution suitable for carrying out the process according to the invention contains alkali orthophosphates and polyphosphates in aqueous solution, 25 to 75% by weight of the total phosphate, calculated as PO 4 , being present in the form of orthophosphate and polyphosphate.
- the term polyphosphate is intended to include oligophosphates here.
- the inventive method can not only the undesirable Rust coloration of the water in metal systems on the Base of iron, but also going into dissolution is harmful to health Amounts of copper and lead ions from copper or lead-containing systems with minimal use of materials avoided will.
Abstract
Description
Claims (11)
- Verfahren zur Korrosionsschutzbehandlung wasserführender Metallsysteme durch Dosierung einer Kombination von Phosphaten und Silikaten in den Wasserstrom, dadurch gekennzeichnet, daß Phosphate und Silikate getrennt voneinander zudosiert werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Silikate als wäßrige Silikatlösung mit einem Modul von 1,8 bis 3,5 und einer Konzentration von mindestens 20 Gew.-% SiO2 zudosiert werden.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Silikatlösung ein lösliches Carbonat oder Hydrogencarbonat enthält.
- Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die Phosphate als wäßrige Phosphatlösung mit einer Konzentration von mindestens 20 Gew.-% PO4 zudosiert werden.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß das Phosphat in der Phosphatlösung zu jeweils 25 bis 75 Gew.-% als Ortho- und Polyphosphat vorliegt.
- Verfahren nach Anspruch 1 bis 5, dadurch gekennzeichnet, daß mit Bezug auf die Stromrichtung des Wassers die Dosierung des Phosphats vor der Dosierung des Silikats erfolgt.
- Verfahren nach Anspruch 1 bis 6, dadurch gekennzeichnet, daß die Gewichtsmengen der zudosierten Silikate und Phosphate so bemessen werden, daß dem Wasserstrom 1,0 bis 40 mg/l SiO2 und 0,1 bis 6,7 mg/l PO4 zugesetzt werden.
- Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die Gewichtsmengen der zudosierten Silikate und Phosphate aufgrund von Wasseranalysen und/oder Vorversuchen festgelegt werden.
- Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die Gewichtsmengen der zudosierten Silikate und Phosphate im Laufe der Zeit verändert werden.
- Mittel zur Korrosionsschutzbehandlung wasserführender Metallsysteme in einem Verfahren nach einem der vorhergehenden Ansprüche, enthaltend in wäßriger Lösung Alkalisilikate, -carbonate und -hydrogencarbonate in Konzentrationen von mindestens 20 Gew.-% SiO2 bzw. 0,1 Gew.-% CO3.
- Mittel zur Korrosionsschutzbehandlung wasserführender Metallsysteme in einem Verfahren nach einem der Ansprüche 1 bis 9, enthaltend Alkaliortho- und -polyphosphate, wobei der Gewichtsanteil der Ortho- und Polyphosphaten am Gesamtphosphatgehalt, ausgedrückt als PO4, jeweils 25 bis 75 Gew.-% und die Gesamtkonzentration an PO4 mindestens 20 Gew.-% beträgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19706410A DE19706410C2 (de) | 1997-02-19 | 1997-02-19 | Verfahren und Mittel zur Korrosionsschutzbehandlung wasserführender Metallsysteme |
DE19706410 | 1997-02-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0860517A1 true EP0860517A1 (de) | 1998-08-26 |
EP0860517B1 EP0860517B1 (de) | 2001-10-24 |
Family
ID=7820738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98101043A Expired - Lifetime EP0860517B1 (de) | 1997-02-19 | 1998-01-22 | Verfahren zur Korrosionsschutzbehandlung wasserführender Metallsysteme |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0860517B1 (de) |
AT (1) | ATE207553T1 (de) |
DE (2) | DE19706410C2 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1780310A2 (de) | 2005-10-18 | 2007-05-02 | Henkel Kommanditgesellschaft Auf Aktien | Verfahren zur Korrosionsschutzbehandlung wasserführender Metallsysteme unter Vorkonditionierung des Korrosionsschutzmittels |
EP2147989A1 (de) * | 2008-07-18 | 2010-01-27 | Airedale Chemical Company Limited | Behandlungslösung |
DE102014003770A1 (de) | 2014-03-17 | 2015-09-17 | Kurita Water Industries, Ltd. | Verfahren zur Korrosionsinhibierung von wasserführenden Systemen |
EP3808875A1 (de) * | 2019-10-01 | 2021-04-21 | Bwt Ag | Inhibitoren-lösung zum korrosionsschutz für wasserführende leitungen und installationssysteme |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE674450A (de) * | ||||
FR2130717A1 (de) * | 1971-03-24 | 1972-11-03 | Hercules Inc | |
US3935125A (en) * | 1974-06-25 | 1976-01-27 | Chemed Corporation | Method and composition for inhibiting corrosion in aqueous systems |
US4134959A (en) * | 1976-05-10 | 1979-01-16 | Chemed Corporation | Azole-phosphate corrosion inhibiting composition and method |
EP0054083A1 (de) * | 1980-02-14 | 1982-06-23 | C.H. De Gram | Verfahren zum Schutz von Rohrleitungen eines Heizungssystems |
WO1983002628A1 (en) * | 1982-01-29 | 1983-08-04 | Kuhn, Vincent R. | Method of and composition for inhibiting corrosion of iron base metals |
EP0102587A1 (de) * | 1982-09-02 | 1984-03-14 | Henkel Kommanditgesellschaft auf Aktien | Verfahren zur Korrosionsschutzbehandlung wasserführender Systeme |
DE3508526C1 (de) * | 1985-03-09 | 1986-06-19 | Otto 7062 Rudersberg Kamp | Verfahren zur Reinigung und zum Korrosionsschutz von Brauchwassersystemen oder Heizungsanlagen |
US4867944A (en) * | 1988-01-13 | 1989-09-19 | Gulf Coast Performance Chemical, Inc. | Method of preventing corrosion by contaminated cooling tower waters |
EP0339716A1 (de) * | 1988-04-21 | 1989-11-02 | Calgon Corporation | Verfahren und Zusammensetzung zum Kontrollieren der Korrosion in weichem oder hartem Wasser |
EP0479572A2 (de) * | 1990-10-03 | 1992-04-08 | Betz Europe, Inc. | Korrosionsinhibierung für Kupfer oder Kupferenthaltende Metalle |
EP0510989A1 (de) * | 1991-04-24 | 1992-10-28 | Calgon Corporation | Synergetische Mischung von Natriumsilikat und Orthophosphat zur Korrosionsinhibierung von Kohlenstoffstahl, zur Inhibierung von Mangan und Eisen-Niederschlägs und zur Verminderung lösliches Blei in Brauchwasser |
DE4321883A1 (de) * | 1993-07-01 | 1995-01-12 | Henkel Kgaa | Natronwasserglaslösungen mit hohen Orthophosphatgehalten für den Korrosionsschutz im Trinkwasserbereich |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3706995A1 (de) * | 1987-03-05 | 1988-09-15 | Hakem Patentverwertung Gmbh & | Verfahren zur sanierung von stahlbewehrtem beton |
JPH06320492A (ja) * | 1993-05-10 | 1994-11-22 | Hitachi Maxell Ltd | ウエブの分断方法とウエブの分断装置 |
-
1997
- 1997-02-19 DE DE19706410A patent/DE19706410C2/de not_active Expired - Fee Related
-
1998
- 1998-01-22 EP EP98101043A patent/EP0860517B1/de not_active Expired - Lifetime
- 1998-01-22 AT AT98101043T patent/ATE207553T1/de active
- 1998-01-22 DE DE59801830T patent/DE59801830D1/de not_active Expired - Lifetime
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE674450A (de) * | ||||
FR2130717A1 (de) * | 1971-03-24 | 1972-11-03 | Hercules Inc | |
US3935125A (en) * | 1974-06-25 | 1976-01-27 | Chemed Corporation | Method and composition for inhibiting corrosion in aqueous systems |
US4134959A (en) * | 1976-05-10 | 1979-01-16 | Chemed Corporation | Azole-phosphate corrosion inhibiting composition and method |
EP0054083A1 (de) * | 1980-02-14 | 1982-06-23 | C.H. De Gram | Verfahren zum Schutz von Rohrleitungen eines Heizungssystems |
WO1983002628A1 (en) * | 1982-01-29 | 1983-08-04 | Kuhn, Vincent R. | Method of and composition for inhibiting corrosion of iron base metals |
EP0102587A1 (de) * | 1982-09-02 | 1984-03-14 | Henkel Kommanditgesellschaft auf Aktien | Verfahren zur Korrosionsschutzbehandlung wasserführender Systeme |
DE3508526C1 (de) * | 1985-03-09 | 1986-06-19 | Otto 7062 Rudersberg Kamp | Verfahren zur Reinigung und zum Korrosionsschutz von Brauchwassersystemen oder Heizungsanlagen |
US4867944A (en) * | 1988-01-13 | 1989-09-19 | Gulf Coast Performance Chemical, Inc. | Method of preventing corrosion by contaminated cooling tower waters |
EP0339716A1 (de) * | 1988-04-21 | 1989-11-02 | Calgon Corporation | Verfahren und Zusammensetzung zum Kontrollieren der Korrosion in weichem oder hartem Wasser |
EP0479572A2 (de) * | 1990-10-03 | 1992-04-08 | Betz Europe, Inc. | Korrosionsinhibierung für Kupfer oder Kupferenthaltende Metalle |
EP0510989A1 (de) * | 1991-04-24 | 1992-10-28 | Calgon Corporation | Synergetische Mischung von Natriumsilikat und Orthophosphat zur Korrosionsinhibierung von Kohlenstoffstahl, zur Inhibierung von Mangan und Eisen-Niederschlägs und zur Verminderung lösliches Blei in Brauchwasser |
DE4321883A1 (de) * | 1993-07-01 | 1995-01-12 | Henkel Kgaa | Natronwasserglaslösungen mit hohen Orthophosphatgehalten für den Korrosionsschutz im Trinkwasserbereich |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1780310A2 (de) | 2005-10-18 | 2007-05-02 | Henkel Kommanditgesellschaft Auf Aktien | Verfahren zur Korrosionsschutzbehandlung wasserführender Metallsysteme unter Vorkonditionierung des Korrosionsschutzmittels |
EP2147989A1 (de) * | 2008-07-18 | 2010-01-27 | Airedale Chemical Company Limited | Behandlungslösung |
GB2465211A (en) * | 2008-07-18 | 2010-05-19 | Airedale Chemical Company Ltd | A Water treatment solution for preventing corrosion of lead piping |
GB2465211B (en) * | 2008-07-18 | 2013-09-25 | Airedale Chemical Company Ltd | Treatment Solution |
DE102014003770A1 (de) | 2014-03-17 | 2015-09-17 | Kurita Water Industries, Ltd. | Verfahren zur Korrosionsinhibierung von wasserführenden Systemen |
EP3808875A1 (de) * | 2019-10-01 | 2021-04-21 | Bwt Ag | Inhibitoren-lösung zum korrosionsschutz für wasserführende leitungen und installationssysteme |
Also Published As
Publication number | Publication date |
---|---|
DE19706410C2 (de) | 2001-04-05 |
DE19706410A1 (de) | 1998-08-27 |
DE59801830D1 (de) | 2001-11-29 |
EP0860517B1 (de) | 2001-10-24 |
ATE207553T1 (de) | 2001-11-15 |
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