DE3001505A1 - Corrosion inhibitor contg. molybdate, amine and opt. auxiliary - e.g. sodium polymethacrylate, used in closed water system opt. contg. ethylene glycol - Google Patents
Corrosion inhibitor contg. molybdate, amine and opt. auxiliary - e.g. sodium polymethacrylate, used in closed water system opt. contg. ethylene glycolInfo
- Publication number
- DE3001505A1 DE3001505A1 DE19803001505 DE3001505A DE3001505A1 DE 3001505 A1 DE3001505 A1 DE 3001505A1 DE 19803001505 DE19803001505 DE 19803001505 DE 3001505 A DE3001505 A DE 3001505A DE 3001505 A1 DE3001505 A1 DE 3001505A1
- Authority
- DE
- Germany
- Prior art keywords
- molybdate
- contg
- opt
- corrosion
- amine
- 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
- 239000003112 inhibitor Substances 0.000 title claims abstract description 37
- 238000005260 corrosion Methods 0.000 title claims abstract description 27
- 230000007797 corrosion Effects 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229920000193 polymethacrylate Polymers 0.000 title claims abstract description 14
- 150000001412 amines Chemical class 0.000 title claims abstract description 9
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 title claims abstract description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims description 17
- 239000011734 sodium Substances 0.000 title claims description 17
- 229910052708 sodium Inorganic materials 0.000 title claims description 17
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 title abstract description 21
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 claims abstract description 28
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000012964 benzotriazole Substances 0.000 claims abstract description 21
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229920001577 copolymer Polymers 0.000 claims abstract description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 4
- 125000003011 styrenyl group Chemical class [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 claims abstract 2
- 235000015393 sodium molybdate Nutrition 0.000 claims description 17
- 239000011684 sodium molybdate Substances 0.000 claims description 17
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 abstract description 7
- 229910000881 Cu alloy Inorganic materials 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000008021 deposition Effects 0.000 abstract description 3
- 229910052791 calcium Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 229910052749 magnesium Inorganic materials 0.000 abstract description 2
- 230000001934 delay Effects 0.000 abstract 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 229910000537 White brass Inorganic materials 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 150000003440 styrenes Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- AEDZKIACDBYJLQ-UHFFFAOYSA-N ethane-1,2-diol;hydrate Chemical compound O.OCCO AEDZKIACDBYJLQ-UHFFFAOYSA-N 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 150000002429 hydrazines Chemical class 0.000 description 1
- 229910003480 inorganic solid Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- -1 molybdate anion Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
Korrosionsinhibitor für geschlossene Wassersysteme Corrosion inhibitor for closed water systems
Die Erfindung betrifft einen verbesserten Korrosionsinhibitor für geschlossene Wassersysteme.The invention relates to an improved corrosion inhibitor for closed water systems.
Im Stand der Technik ist eine Vielzahl von Inhibitoren bekannt, von denen viele Nachteile aufweisen. Einige zum Beispiel neigen zum Verlust ihrer Effektivität oder brechen zusammen aufgrund eines Lufteinbruches in das Wassersystem. In dieser Weise reagieren Hydrazin enthaltende Inhibitoren mit Sauerstoff und verlieren nicht nur ihre Effektivität, sondern neigen auch in Heißwasserbereitungssystemen zur Entwicklung von Ammoniak, welches in Gegenwart von Sauerstoff schwere Korrosionen des Kupfers oder der Kupferlegierungen herbeiführt.A variety of inhibitors are known in the art, from which have many disadvantages. For example, some tend to be less effective or collapse due to air ingress into the water system. In this In some ways, hydrazine-containing inhibitors react with oxygen and do not lose only their effectiveness but also tend to develop in hot water systems of ammonia, which in the presence of oxygen causes severe corrosion of copper or the copper alloys.
Andere Inhibitoren sind empfänglich für biologischen Abbau, der häufig bei auf Borat/Nitrit basierenden Zusammensetzungen vorkommt.Other inhibitors are susceptible to biodegradation, which is common occurs in borate / nitrite based compositions.
Einige Inhibitoren werden als ernstliche Umweltverschmutzer angesehen, wenn eine Leckage auftritt. Dies ist der Fall bei Chromaten und Hydrazinen. Die Chromate haben auch eine unerwünscht gelbe Farbe und neigen zum Färben.Some inhibitors are considered serious polluters, when a leak occurs. This is the case with chromates and hydrazines. the Chromates also have an undesirably yellow color and are prone to coloring.
Viele der vorbekannten Inhibitoren erfordern einen hohen anorganischen Feststoffgehalt, der in hohem Maße die unerwünschte Ablagerung von Feststoffen dort vermehrt, wo sich Leckagen im System gebildet haben und greift auch die Pumpendichtungen an.Many of the previously known inhibitors require a high level of inorganic Solids content, which in large measure the undesirable deposition of solids there increases where leaks have formed in the system and also attacks the pump seals at.
Viele Inhibitoren sind auch unverträglich mit Syse,' JV v die mit Äthylenglykol behandelt sind.Many inhibitors are also incompatible with Syse, 'JV v those with Treated with ethylene glycol.
einige Inhibitoren, die für Fluß stahl ausreichen, bewirken mer che Korrosionszunahmen bei anderen Metallen und können auch zu unerwünscht hohen pH-Werten führen.some inhibitors that are sufficient for mild steel cause mer che Corrosion increases in other metals and can also lead to undesirably high pH levels to lead.
Andere werden durch Hitze zersetzt oder haben verschiedene Nachteile.Others are decomposed by heat or have various disadvantages.
Im Hinblick auf die vielen Nachteile der vorbekannten Inhibitoren ist es Aufgabe der vorliegenden Erfindung, einen neuen und verbesserten Korrosionsinhibitor für geschlossene Wassersysteme bereitzustellen, der die Nachteile der vorbekannten Inhibitoren überwindet.In view of the many disadvantages of the previously known inhibitors it is the object of the present invention to provide a new and improved corrosion inhibitor provide for closed water systems, the disadvantages of the previously known Overcomes inhibitors.
Der Korrosionsinhibitor für geschlossene Wassersysteme ist gemäß der Erfindung dadurch gekennzeichnet, daß er wenigstens ein Molybdat und wenigstens ein Amin, sowie gegebenenfalls einen Hilfsinhibitor enthält. Diese Stoffe bewirken, wenn sie zusammengemischt und dem Wasser zugesetzt werden, den Korrosionsschutz des Metalls in wäßriger Umgebung.The corrosion inhibitor for closed water systems is according to Invention characterized in that it contains at least one molybdate and at least contains an amine and optionally an auxiliary inhibitor. These substances cause if they are mixed together and added to the water, the corrosion protection of the metal in an aqueous environment.
Es wurden verschiedene Zusammensetzungen entwickelt und die Korrosionsrate bestimmt. Die Ergebnisse stehen in einem ungewöhnlichen Kontrast zu den Ergebnissen von Korrosionsinhibitoren der vorbekannten Art.Various compositions have been developed and the rate of corrosion certainly. The results are in unusual contrast to the results of corrosion inhibitors of the known type.
In einer bevorzugten Ausführungsform der Erfindung wird ein Hilfsinhibitor zugesetzt, wie Benzotriazol, Natriumpolymethacrylat oder ein Copolymer aus sulfoniertem Styrol und Maleinsäureanhydrid.In a preferred embodiment of the invention, an auxiliary inhibitor is used added, such as benzotriazole, sodium polymethacrylate or a copolymer of sulfonated Styrene and maleic anhydride.
Morpholin und Äthylendiamin sind bevorzugte Amine. Der erfindungsgemäße Inhibitor ist auch für die Verwendung in geschlossenen Wassersystemen geeignet, die Äthylenglykol enthalten.Morpholine and ethylenediamine are preferred amines. The inventive Inhibitor is also for use in closed water systems suitable that contain ethylene glycol.
Es ist weiterhin festzuhalten, daß das Molybdat-Anion leicht und genau bestimmt werden kann unter Verwendung eines einfachen Farbvergleichstestes, sei es, daß das verwendet Medium Wasser ist oder Äthylenglykol und Wasser Als kennzeichnend für die erhaltenen Ergebnisse wurden, wie in den folgenden Beispielen gezeigt, zwei Arten von Tests verwendet: Der erste war ein Becherglastest, in welchem die Metallproben in einer Lösung des Inhibitors in Leitungswasser mittlerer Härte bei Raumtemperatur während sechs Tagen gerührt wurden. Im zweiten Test wurden, um den Inhibitor unter statischen Bedingungen zu prüfen, die Proben in inhibiertem Leitungswasser in einer geschlossenen, fast vollen Flasche eingetaucht. Die Flaschen wurden bei Raumtemperatur während zweier Tage gehalten und dann in einen Ofen bei 70 OC für weitere fünf Tage eingebracht. Die folgenden Ergebnisse veranschaulichen die Korrosionsschutzeigenschaften der Mischungen aus Natriummolybdat und Aminen: Beispiel Zusammensetzung Konzentration Korrosions-Rate für PPM Flußstahl (mm/Jahr) Becherglas- Flaschen-Test Test 1. Natriummolybdat Morpholin 152 0,130 0,372 Benzotriazol 16 2. Natriummolybdat 160 Morpholin 200 Benzotriazol 16 0,042 0,0 3. Natriummolybdat 250 Morpholin 200 Benzotriazol 16 0,02 Becherglas- Flaschen-Test Test 4. Natriummolybdat 220 Morpholin 200 0,017 0,045 Benzotriazol 16 5. Natriummolybdat 220 2-Amino-2-methylpropanol 200 0,025 0,050 Benzotriazol 16 6. Natriummolybdat 220 Äthylendiamin 100 0,007 0,012 Benzotriazol 16 7. Natriummolybdat 220 Morpholin 200 Benzotriazol 16 - 0,015 Natriumpolymeth- 36 acrylat 8. Natriummolydat 330 Morpholin 300 Benzotriazol 24 - 0,005 Natriumpolymethacrylat 54 9. Natriummolybdat 220 Morpholin 200 Benzotriazol 6 0,022 0,050 Natriump olymethacrylat 36 10. Natriummolybdat 440 Ifiorpholine 400 Benzotriazol 12 0,007 0,020 bTatriumpolymethacrylat 72 11. Natriummolybdat 220 Äthylendiamin 100 Benzotriazol 6 0,010 0,015 Natriumpolymethacrylat 36 12. Natriummolybdat 440 Äthylendiamin 200 Benzotriazol 12 Natriumpolymethacrylat 72 Becherglas- Flaschen-Test Test 13. Natriummolybdat 200 Äthylendiamin 100 Benzotriazol 6 0,007 0,010 Sulphori. Styrol/ t'taleinsäureanhydrid-Copolymerisat 9 Es wurde gefunden, daß Benzotriazol ein Inhibitor für Kupfer und Kupferlegierungen ist und deshalb die Korrosionsschutzeigenschaften dieses Ansatzes verbessert.It should also be noted that the molybdate anion is light and accurate can be determined using a simple color comparison test it that the medium used is water or ethylene glycol and water as indicative the results obtained became two as shown in the following examples Types of Tests Used: The first was a beaker test, in which the metal samples in a solution of the inhibitor in tap water of medium hardness at room temperature were stirred for six days. The second test were to take the inhibitor To test the samples in inhibited tap water in a static condition closed, almost full bottle immersed. The bottles were at room temperature held for two days and then placed in an oven at 70 ° C for another five days brought in. The following results illustrate the anti-corrosive properties of mixtures of sodium molybdate and amines: example composition concentration Corrosion rate for PPM mild steel (mm / year) Beaker bottle test test 1. Sodium molybdate Morpholine 152 0.130 0.372 benzotriazole 16 2. sodium molybdate 160 morpholine 200 benzotriazole 16 0.042 0.0 3. Sodium Molybdate 250 Morpholine 200 Benzotriazole 16 0.02 Beaker Bottle Test Test 4. Sodium Molybdate 220 Morpholine 200 0.017 0.045 Benzotriazole 16 5. Sodium Molybdate 220 2-Amino-2-methylpropanol 200 0.025 0.050 Benzotriazole 16 6. Sodium Molybdate 220 Ethylenediamine 100 0.007 0.012 Benzotriazole 16 7. Sodium Molybdate 220 morpholine 200 benzotriazole 16-0.015 sodium polymeth- 36 acrylate 8. sodium molydate 330 Morpholine 300 Benzotriazole 24 - 0.005 Sodium Polymethacrylate 54 9. Sodium Molybdate 220 morpholine 200 benzotriazole 6 0.022 0.050 sodium poly methacrylate 36 10. sodium molybdate 440 Ifiorpholine 400 Benzotriazole 12 0.007 0.020 b Sodium polymethacrylate 72 11. Sodium Molybdate 220 Ethylenediamine 100 Benzotriazole 6 0.010 0.015 Sodium Polymethacrylate 36 12. Sodium Molybdate 440 Ethylenediamine 200 Benzotriazole 12 Sodium Polymethacrylate 72 Beaker-Bottle Test Test 13. Sodium Molybdate 200 Ethylenediamine 100 Benzotriazole 6 0.007 0.010 Sulphori. Styrene / ttaleinic anhydride copolymer 9 Benzotriazole was found to be an inhibitor for copper and copper alloys and therefore improves the anti-corrosive properties of this approach.
In die Ansätze 7 bis 13 wurde Natriumpolymethacrylat aus folgenden Gründen einbezogen: a) Es wurde gefunden, daß dies die unerwünschte Kesselsteinbildung auf Oberflächen von Hochtemperatur-W+årmeaustauschern verzögert oder verhindert, wie dies bei Heißwasserbereitungssystemen unter Verwendung von nicht weichgemachtem Zusatzwasser der Fall ist.In runs 7 to 13, sodium polymethacrylate was made from the following Reasons included: a) It has been found that this is the undesirable scale formation delayed or prevented on surfaces of high temperature heat exchangers, as is the case with hot water systems using non-plasticized Make-up water is the case.
b) Es wurde auch gefunden, daß dies das Kristallwachstum von Calcium, Magnesium und Eisenablagerungen verzögert.b) It has also been found that this is the crystal growth of calcium, Magnesium and iron deposition delayed.
Diese Kristallablagerungen sind unerwünscht und wirken zerstörend auf die Pumpendichtungen. These crystal deposits are undesirable and have a destructive effect on the pump seals.
Als eine Alternative zu dem Natriumpolymethacrylat wurde ein Copolymer aus sulphoniertem Styrol und Maleinsäureanhydrid untersucht.A copolymer was used as an alternative to the sodium polymethacrylate investigated from sulphonated styrene and maleic anhydride.
Einige der vorgenannten Stoffkombinationen wurden als Korrosionsinhibitoren für andere Metalle als Flußstahl mit folgendem Ergebnis ausgewertet: Behandlung Zus ensetzung Konzentra- Metall Korrosions-Rate tion ppM (mm/Jahr) Becherglas- Flachen-Test - Test 4. 0 ri1rrnmolybdat 200 Kupfer 0,007 Morpholin 200 Schiffsmessing 0,007 Benzotriazol 16 Aluminium 0,035 11. Natriummolybdat 220 Kupfer 0,010 Äthylendiamin 100 Aluminium 0,087 0,050 Benzotriazol 6 Natriumpolymethacrylat 36 12. Natriummolybdat 440 Äthylendiamin 200 Kupfer 0,010 Ben20triazol 12 Aluminium 0,200 0,140 Natriumpolymethacrylat 72 9a. Natriummolydat 440 Morpholin 400 Benzotriazol 12 Weißmessing 0,002 0,040 Natriumpolymethactylat 72 Aluminium 0,052 0,247 10. Natriummolybdat 440 Morpholin 400 Weißmessing 0,002 0,040 Benzotriazol 12 Aluminium 0,052 0,247 Natriumpolymethacrylat 72 Die bevorzugte Behandlung erfolgt mit Ansatz Nr. 9a (und Nr. 10; Ansätze mit doppelter Dosierung des Ansatzes Nr. 9) insoweit, als sie weniger aggressiv gegenüber Aluminium in einem fliessenden System ist als die auf Äthylendiamin anstatt Morpholin basierende Formulierung (Nr. 11 und Nr. 12).Some of the aforementioned combinations of substances were used as corrosion inhibitors evaluated for metals other than mild steel with the following result: treatment Composition Concentration Metal Corrosion Rate ppM (mm / year) Beaker surface test - Test 4.0 molybdate 200 copper 0.007 morpholine 200 marine brass 0.007 benzotriazole 16 aluminum 0.035 11. sodium molybdate 220 copper 0.010 ethylene diamine 100 aluminum 0.087 0.050 Benzotriazole 6 Sodium Polymethacrylate 36 12. Sodium Molybdate 440 Ethylenediamine 200 copper 0.010 ben20triazole 12 aluminum 0.200 0.140 sodium polymethacrylate 72 9a. Sodium Molydate 440 Morpholine 400 Benzotriazole 12 White Brass 0.002 0.040 Sodium Polymethactylate 72 aluminum 0.052 0.247 10. Sodium molybdate 440 morpholine 400 white brass 0.002 0.040 Benzotriazole 12 Aluminum 0.052 0.247 Sodium Polymethacrylate 72 The preferred Treatment is carried out with batch No. 9a (and No. 10; batches with double dosage of approach no. 9) insofar as they are less aggressive towards aluminum in a flowing system is than the formulation based on ethylene diamine instead of morpholine (No. 11 and No. 12).
Schließlich wurden die Korrosionsraten für Flußstahl einer Behandlung mit den Ansätzen Nr. 9a und 10 unter Verwendung eines Kühlmediums aus 50 % Leitungswasser und 50 % Äthylenglykol bestimmt. Eventually, the corrosion rates for mild steel became one treatment with batches no. 9a and 10 using a cooling medium composed of 50% tap water and 50% ethylene glycol determined.
Die Werte waren die folgenden: 3handlung mit Ansatz Korrosions-Rate in mm/Jahr Becherglas- Flaschen-Test Test Nr. 9a 0,010 0,025 Nr. 10 0,010 0,007 Diese Ergebnisse zeigen, daß der gleiche Korrosionsschutz in kthylenglykol-Wasser-Mischungen erzielt werden kann wie in Wasser alleine.The values were as follows: 3handling with approach corrosion rate in mm / year beaker-bottle test test No. 9a 0.010 0.025 No. 10 0.010 0.007 These results show that the same corrosion protection in ethylene glycol-water mixtures can be achieved as in water alone.
Die Erfindung weist Vorteile auf. Der Korrosionsinhibitor der vorliegenden Erfindung für geschlossene Wassersysteme ist ebenso auch für Äthylenglykol enthaltende Systeme geeignet, er reagiert nicht in nachteiliger Weise mit Sauerstoff, verliert nicht seine Effektivität, ruft keine Korrosionseffekte an Kupfer oder Kupferlegierungen hervor, unterliegt keinem biologischen Abbau, ist umweltfreundlich und wirkt nicht verfärbend.The invention has advantages. The corrosion inhibitor of the present Invention for closed water systems is also for ethylene glycol containing Systems suitable, it does not react adversely with oxygen, loses not its effectiveness, does not cause any corrosion effects on copper or copper alloys is not subject to biodegradation, is environmentally friendly and does not work discoloring.
Claims (8)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000320465A CA1118990A (en) | 1979-01-30 | 1979-01-30 | Molybdate-amine corrosion inhibitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3001505A1 true DE3001505A1 (en) | 1980-08-14 |
| DE3001505C2 DE3001505C2 (en) | 1984-05-10 |
Family
ID=4113414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19803001505 Expired DE3001505C2 (en) | 1979-01-30 | 1980-01-17 | Corrosion inhibitor for closed water systems |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1118990A (en) |
| DE (1) | DE3001505C2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0588494A1 (en) * | 1992-08-17 | 1994-03-23 | W.R. Grace & Co.-Conn. | Method for the inhibition of oxygen corrosion in aqueous systems by the use of a tannin activated oxygen scavenger |
| WO1996039549A1 (en) * | 1995-06-05 | 1996-12-12 | Betzdearborn Inc. | Method for inhibiting metal corrosion in large scale water systems |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2005219734B2 (en) * | 2004-03-05 | 2010-07-01 | Kitz Corporation | Method of preventing nickel leaching from copper alloy made liquid-contact equipment item, protective film forming agent for nickel leaching prevention and cleaner for nickel leaching prevention |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4018701A (en) * | 1975-07-31 | 1977-04-19 | Calgon Corporation | Phosphorous acid and zinc corrosion inhibiting compositions and methods for using same |
| GB1534596A (en) * | 1975-09-08 | 1978-12-06 | Betz Int | Control of scaling in an aqueous medium |
| JPH05227033A (en) * | 1992-02-13 | 1993-09-03 | Nec Corp | Pulse width modulation circuit |
-
1979
- 1979-01-30 CA CA000320465A patent/CA1118990A/en not_active Expired
-
1980
- 1980-01-17 DE DE19803001505 patent/DE3001505C2/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4018701A (en) * | 1975-07-31 | 1977-04-19 | Calgon Corporation | Phosphorous acid and zinc corrosion inhibiting compositions and methods for using same |
| GB1534596A (en) * | 1975-09-08 | 1978-12-06 | Betz Int | Control of scaling in an aqueous medium |
| JPH05227033A (en) * | 1992-02-13 | 1993-09-03 | Nec Corp | Pulse width modulation circuit |
Non-Patent Citations (4)
| Title |
|---|
| Chem.Abstr. Vol.68, 1968, S.11276 (116824e) * |
| Chem.Abstr. Vol.87, 1977, S.210 (42721 n) * |
| Materials Performance, 15, Febr. 1976, S.9-13 * |
| Materials Performance, Nov.1976, S.40-44 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0588494A1 (en) * | 1992-08-17 | 1994-03-23 | W.R. Grace & Co.-Conn. | Method for the inhibition of oxygen corrosion in aqueous systems by the use of a tannin activated oxygen scavenger |
| US5587109A (en) * | 1992-08-17 | 1996-12-24 | W. R. Grace & Co.-Conn. | Method for inhibition of oxygen corrosion in aqueous systems by the use of a tannin activated oxygen scavenger |
| GB2303848A (en) * | 1992-08-17 | 1997-03-05 | Grace W R & Co | Inhibiting oxygen corrosion in aqueous systems |
| GB2303848B (en) * | 1992-08-17 | 1997-04-16 | Grace W R & Co | Inhibition of oxygen corrosion in aqueous systems |
| US5830383A (en) * | 1992-08-17 | 1998-11-03 | Betzdearborn Inc. | Method for inhibition of oxygen corrosion in aqueous systems by the use of a tannin activated oxygen scavenger |
| WO1996039549A1 (en) * | 1995-06-05 | 1996-12-12 | Betzdearborn Inc. | Method for inhibiting metal corrosion in large scale water systems |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3001505C2 (en) | 1984-05-10 |
| CA1118990A (en) | 1982-03-02 |
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| 8331 | Complete revocation |