DE4240945A1 - Korrosionsschutzmittel - Google Patents

Korrosionsschutzmittel

Info

Publication number
DE4240945A1
DE4240945A1 DE4240945A DE4240945A DE4240945A1 DE 4240945 A1 DE4240945 A1 DE 4240945A1 DE 4240945 A DE4240945 A DE 4240945A DE 4240945 A DE4240945 A DE 4240945A DE 4240945 A1 DE4240945 A1 DE 4240945A1
Authority
DE
Germany
Prior art keywords
corrosion
emulsifiers
carbon atoms
formula
corrosion inhibitor
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Withdrawn
Application number
DE4240945A
Other languages
English (en)
Inventor
Helmut Dr Endres
Bernd Stedry
Bernd Dr Fabry
Juergen Dr Geke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Priority to DE4240945A priority Critical patent/DE4240945A1/de
Priority to EP93923564A priority patent/EP0667891A1/de
Priority to PCT/EP1993/002990 priority patent/WO1994011469A1/de
Publication of DE4240945A1 publication Critical patent/DE4240945A1/de
Withdrawn legal-status Critical Current

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    • 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
    • C23F11/16—Sulfur-containing compounds
    • C23F11/163—Sulfonic acids
    • 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
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    • 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
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Description

Gebiet der Erfindung
Die Erfindung betrifft Korrosionsschutzmittel enthaltend Di­ alkylether, Korrosionsinhibitoren, Emulgatoren und gegebe­ nenfalls Co-Emulgatoren sowie die Verwendung von Dialkyl­ ethern als Ölkörper zur Herstellung von Korrosionsschutzmit­ teln.
Stand der Technik
Werden metallische Werkstücke, wie beispielsweise Karosse­ riebauteile, dem Einfluß atmosphärischer Bedingungen ausge­ setzt, bewirkt das Zusammenspiel von Luftfeuchtigkeit und Wärme das Auftreten von Korrosionserscheinungen, die bei kurzfristiger Betrachtung vornehmlich aus ästhetischen Grün­ den unerwünscht sind, langfristig jedoch die Werkstücke zer­ stören können. Aus diesem Grunde besteht ein nachhaltiges Interesse an Mitteln, mit deren Hilfe sich diese Korrosions­ effekte, wenn nicht ausschalten, so doch zumindest merklich verzögern lassen.
Auf dem Gebiet des Korrosionsschutzes existiert ein umfang­ reiches Schrifttum. Moderne Korrosionsschutzmittel enthalten in der Regel unpolare oder polare Öle, Emulgatoren, Korro­ sionsinhibitoren und gegebenenfalls Wasser. Ihre Wirkung be­ ruht auf der Adsorption von Inhibitormolekülen auf der Me­ talloberfläche und der Bildung eines Schutzfilms aus Emul­ sionsbestandteilen, der als Diffusionsbarriere für Luftsau­ erstoff und Wasser wirkt. Andere handelsüblichen Systeme ba­ sieren auf wasserfreien Ölkonzentraten, die Emulgatoren und Korrosionsinhibitoren enthalten. Dies setzt jedoch voraus, daß nur solche Wirkstoffe eingesetzt werden können, die über eine ausreichende Öllöslichkeit verfügen [Oberfläche-Surface, 4, 8 (1989)].
Als Ölkomponenten werden heutzutage vorzugsweise Paraffin- oder Mineralöle eingesetzt. Die Verwendung von Carbonsäuren und gegebenenfalls substituierten Aminen sowie von Fettsäu­ reamidseifen als Korrosionsinhibitoren wird beispielsweise in der Deutschen Patentanmeldung DE-A1 21 60 100 sowie der Nie­ derländischen Patentanmeldung NL-A1 74 13 481 beschrieben. Aus der Deutschen Patentanmeldung DE-A1 39 33 137 sind des weiteren Rostschutzemulsionen bekannt, die Mineralöl, Car­ bonsäuren sowie nichtionische Tenside vom Typ der Fettalko­ holpolyglycolether enthalten. Letztere besitzen jedoch keine korrosionsinhibierenden Eigenschaften, sondern stellen die Emulgatorkomponente dar. In Soap,Cosm.Cheia.Spec. Mai, 39 (1975) wird schließlich berichtet, daß Anlagerungsprodukte von Schwefelsäure an ungesättigte Triglyceride, sogenannte "Sulfoils", über korrosionsinhibierende Eigenschaften verfü­ gen. Bei diesen Sulfoils, die zusammen mit Alkylbenzolsulfo­ naten oder Alkylphenolpolyglycolethern eingesetzt werden, handelt es sich um Triglyceride, deren Fettsäurereste mit Sulfatgruppen substituiert sind.
Da Korrosionsschutzmittel früher oder später über Kläranlagen in die Oberflächengewässer gelangen, müssen hohe Anforde­ rungen an ihre ökologische Verträglichkeit gestellt werden. Ein besonderes Augenmerk gilt dabei Mitteln, die als Ölkörper mineralische und daher biologisch "harte" Trägeröle enthal­ ten. Dezufolge besteht ein starkes Bedürfnis nach neuen, mög­ lichst umweltverträglichen Korrosionsschutzmitteln, deren Entwicklung als Aufgabe der Erfindung angesehen werden kann.
Beschreibung der Erfindung
Korrosionsschutzmittel enthaltend
  • a) Dialkylether der Formel (I) R1-O-R2 (I)in der R1 und R2 unabhängig voneinander für aliphatische, lineare oder verzweigte Kohlenwasserstoffreste mit 6 bis 22 Kohlenstoffatomen und 0, 1, 2 oder 3 Doppelbindungen steht,
  • b) Korrosionsinhibitoren,
  • c) Emulgatoren und
  • d) gegebenenfalls Co-Emulgatoren.
Es wurde gefunden, daß Dialkylether eine ausgezeichnete Öl­ basis für Korrosionsschutzmittel darstellen. Die Erfindung schließt ferner die überraschende Erkenntnis ein, daß die Dialkylether besonders rasch auf die Metalloberfläche auf­ ziehen und so einen äußerst effektiven Korrosionsschutz be­ wirken. Die leichte biologische Abbaubarkeit der als Ölkörper fungierenden Dialkylether stellt zudem die gewünschte ver­ besserte Umweltverträglichkeit der erfindungsgemäßen Mittel sicher.
Ölkörper
Als Ölkörper werden im Sinne der Erfindung Dialkylether ein­ gesetzt. Hierbei handelt es sich um bekannte Stoffe, die nach den einschlägigen Verfahren der präparativen organischen Chemie erhalten werden können. Verfahren zu ihrer Herstel­ lung, beispielsweise durch Kondensation von Fettalkoholen in Gegenwart von p-Toluolsulfonsäure sind beispielsweise aus Bull. Soc.Chim.France, 333 (1949), DE-A1 40 39 950 (Hoechst) sowie DE-A1 41 03 489 (Henkel) bekannt. Hinsichtlich des Stands der Technik sei ferner auf die EP-A1 0 170 076 (BASF) verwiesen, in der die Verwendung von Dialkylethern als Träger für Wärmeflüssigkeiten vorgeschlagen wird. Aus der US 4,844,534 (Esso) sind Schmierstoffe bekannt, die Dialkylether enthalten. Gemäß der Lehre der DE-A1 41 16 406 (Henkel) kom­ men Dialkylether auch als Bestandteile von schaumarmen Rei­ nigungsmitteln in Betracht.
Aus anwendungstechnischer Sicht sind symmetrische Dialkyl­ ether als Ölkörper für Korrosionsschutzmittel bevorzugt, die 6 bis 12 Kohlenstoffatomen in den Alkylresten aufweisen. Ein besonders rasches Spreitvermögen weisen Dialkylether der Formel (I) auf, in der R1 und R2 für Octyl- und/ oder 2- Ethylhexylreste stehen. Die im Sinne der Erfindung besonders bevorzugten Dialkylether sind somit Di-n-Octylether und Di- 2-ethylhexylether.
Korrosionsinhibitoren
Als Korrosionsinhibitoren kommen beispielsweise Carbonsäuren der Formel (II) in Betracht,
R3-COOH (II)
in der R3 für einen aliphatischen, linearen oder verzweigten Kohlenwasserstoffrest mit 5 bis 23 Kohlenstoffatomen und 0 bzw. 1 bis 5 Doppelbindungen oder eine R4-Ph-COCH=CH-Gruppe, R4 für einen linearen oder verzweigten Alkylrest mit 8 bis 18 Kohlenstoffatomen und Ph für eine Phenylgruppe steht.
Typische Beispiele sind die Fettsäuren Capronsäure, Capryl­ säure, Caprinsäure, Laurinsäure, Myristinsäure, Palmitinsäu­ re, Palmoleinsäure, Stearinsäure, Isostearinsäure, Ölsäure, Elaidinsäure, Petroselinsäure, Linolsäure, Linolensäure, Elaeostearinsäure, Arachinsäure, Gadoleinsäure, Arachidon­ säure, Behensäure, Erucasäure und Clupanodonsäure sowie deren technische Gemische, wie sie beispielsweise bei der Druck­ spaltung von natürlichen Fetten und Ölen anfallen. Vorzugs­ weise werden Carbonsäuren der Formel (II) eingesetzt, in der R3 für Alkylreste mit 5 bis 17 Kohlenstoffatomen steht.
Beispiele für substituierte Carbonsäure sind in der Gruppe der Alkylbenzoylacrylsäuren enthalten. Besonders bevorzugt ist der Einsatz von 3-(p-Dodecylbenzoyl)acrylsäure.
Als weitere Gruppe von Korrosionsinhibitoren kommen anioni­ sche Tenside vom Typ der Petrolsulfonate in Betracht. Hierbei handelt es sich um Sulfoxidationsprodukte von Paraffinfrak­ tionen mit durchschnittlich 6 bis 30, insbesondere 10 bis 20 Kohlenstoffatomen. Die Petrolsulfonate können auch als se­ kundäre Alkansulfonate aufgefaßt werden, wobei als Gegenionen Alkali- oder Erdalkalimetalle, Ammonium oder Alkylammonium in Betracht kommen. Vorzugsweise werden die Petrolsulfonate in Form ihrer Natrium- oder Calciumsalze eingesetzt.
Als weitere Gruppe von Korrosionsinhibitoren kommen Sulfonie­ rungsprodukte ungesättigter Fettsäureglyceridester der Formel (III), sogenannte "Sulfotriglyceride" oder "Sulfoils" in Be­ tracht,
in der R5CO für einen ungesättigten Acylrest mit 16 bis 24 Kohlenstoffatomen und 1 bis 5 Doppelbindungen und R6CO und R7CO unabhängig voneinander für Acylreste mit 6 bis 24 Koh­ lenstoffatomen und 0 oder 1 bis 5 Doppelbindungen steht.
Sulfotriglyceride stellen bekannte Stoffe dar, die beispiels­ weise durch Anlagerung von Schwefeltrioxid oder Chlorsulfon­ säure an ungesättigte Triglyceride, insbesondere Rapsöl oder Sonnenblumenöl erhalten werden können. In diesem Zusammenhang sei auf die Offenlegungsschriften DE-A1 39 36 001 und DE-A1 41 18 955 der Anmelderin verwiesen, in denen die Herstellung und die korrosionsinhibierenden und selbstemulgierenden Ei­ genschaften der Sulfotriglyceride beschrieben sind. Im Sinne der erfindungsgemäßen Mittel wird vorzugsweise sulfoniertes Raps- öl in Form des Natrium-, Calcium-, Ammonium- oder Al­ kylammoniumsalzes eingesetzt.
Emulgatoren
Als Emulgatoren kommen Anlagerungsprodukte von Ethylen- und/ oder Propylenoxid an Verbindungen mit aciden Wasserstoffato­ men oder Fettsäureester in Betracht. Hierunter sind bei­ spielsweise Alkoxylierungsprodukte von Fettalkoholen, Alkyl­ phenolen, Fettsäuren, Fettaminen und Fettsäuremethylestern zu verstehen, die nach den bekannten Verfahren des Stands der Technik erhalten werden können.
Typische Beispiele sind Anlagerungsprodukte von durchschnitt­ lich 1 bis 20, vorzugsweise 2 bis 10 Mol Ethylenoxid und 0 oder 1 bis 5 Mol Propylenoxid an Fettalkohole mit 6 bis 22 Kohlenstoffatomen, Alkylphenole mit 4 bis 12 Kohlenstoffato­ men im Alkylrest sowie Fettsäuren, Fettamine und Fettsäure­ methylester mit jeweils 6 bis 22 Kohlenstoffatomen im Fett­ rest. Besonders bevorzugt sind Anlagerungsprodukte von 2 bis 10 Mol Ethylenoxid an Lauryl- oder C12/14-Kokosfettalkohol (konventionelle oder eingeengte Homologenverteilung), an Octylphenol, Laurin- oder C12/14-Kokosfettsäure, Laurylamin und/oder Kokosfettsäuremethylester.
Co-Emulgatoren
Als Co-Emulgatoren, die fakultative Bestandteile der erfin­ dungsgemäßen Mittel sind und sich alleine nicht zur Herstel­ lung einer Emulsion eignen, kommen Fettalkohole der Formel (IV) in Betracht,
R8-OH (IV)
in der R8 für Alkyl- und/oder Alkenylreste mit 6 bis 22 Koh­ lenstoffatome steht.
Typische Beispiele sind Capronalkohol, Caprylalkohol, Caprin­ alkohol, Laurylalkohol, Myristylalkohol, Cetylalkohol, Palm­ oleylalkohol, Stearylalkohol, Isostearylalkohol, Oleylalko­ hol, Elaidylalkohol, Petroselinylalkohol, Arachylalkohol, Gadoleylalkohol, Behenylalkohol und Erucylalkohol sowie deren technische Gemische, wie sie beispielsweise bei der Hoch­ druckhydrierung von natürlichen Fettsäuremethylesterfraktio­ nen oder Aldehyden aus der Roelen′schen Oxosynthese anfallen. Vorzugsweise erfolgt die Auswahl der Co-Emulgatoren in An­ lehnung an die C-Kettenlänge der Emulgatoren.
Als weitere Co-Emulgatoren kommen ferner auch verzweigte pri­ märe Alkohole, sogenannte Guerbetalkohole in Betracht, die durch basenkatalysierte Kondenstion von Fettalkoholen erhält­ lich sind und 12 bis 16 Kohlenstoffatome aufweisen können.
Zusammensetzung der erfindungsgemäßen Mittel
Aus anwendungstechnischer Sicht haben sich Korrosionsschutz­ mittel als besonders wirkungsvoll erwiesen, die die genannten Komponenten in den folgenden Mengen enthalten; in Klammern angegeben sind die bevorzugten Bereiche:
10 bis 96 (45 bis 90) Gew.-% Dialkylether,
2 bis 25 (4 bis 15) Gew.-% Korrosionsinhibitoren,
2 bis 15 (4 bis 10) Gew.-% Emulgatoren,
0 bis 15 (0 bis 5) Gew.-% Co-Emulgatoren und
0 bis 86 (10 bis 83) Gew.-% Wasser.
Die erfindungsgemäßen Mittel können als wasserfreie Konzen­ trate zur Anwendung gelangen. Es ist jedoch ebenfalls mög­ lich, die Konzentrate vor Ort mit Wasser auf Konzentrationen von 1 bis 50, vorzugsweise 2 bis 40 und insbesondere 2 bis 20 Gew.-% - bezogen auf die Mittel - zu verdünnen oder derartige Emulsionen bzw. Dispersionen unmittelbar in den Handel zu bringen. Die wäßrigen Mittel können dabei neutral oder auch alkalisch eingestellt sein.
Wäßrige Mittel mit einem günstigen Fließverhalten und einer hohen Lagerstabilität können nach der sogenannten "Phasenin­ versionstemperatur-Methode (PIT)" hergestellt werden, die beispielsweise in der DE-A1 39 33 137 beschrieben ist. Je nach Herstellungsverfahren werden dabei milchig-trübe grobdisperse Emulsionen oder optisch nahezu transparente Mi­ kroemulsionen erhalten.
Neben den genannten Inhaltsstoffen können die erfindungsge­ mäßen Mittel noch weitere in diesem Zusammenhang übliche In­ haltsstoffe aufweisen. Typische Beispiele ohne Anspruch auf Vollständigkeit sind dabei anionische Tenside, Partialgly­ ceride, Borverbindungen, insbesondere Borsäureester, Fett­ säureamide, Phosphorsäureester, Dimerfettsäuren, aliphatische Dicarbonsäuren, Aminodicarbonsäuren sowie Benzoesäure und deren Salze, Thiophosphorsäureester, Dialkyldithiophosphate, Benzotriazole und Polyisobutenbernsteinsäurederivate.
Gewerbliche Anwendbarkeit
Die erfindungsgemäßen Mittel verhindern bzw. verzögern die Bildung von Rost auf Metalloberflächen und sind gut biolo­ gisch abbaubar. Ein besonderer Vorteil gegenüber dem Stand der Technik besteht in der bislang nicht bekannten Wahl von biologisch leichtabbaubaren Dialkylethern als Ölbasis für diese Mittel.
Ein weiterer Gegenstand der Erfindung betrifft daher die Ver­ wendung von Dialkylethern der Formel (I) als Ölkörper bei der Herstellung von Korrosionsschutzmitteln.
Die erfindungsgemäßen wäßrigen Mittel eignen sich nicht nur zum temporären Korrosionsschutz, sie können auch als Reini­ gungsmittel eingesetzt werden, um beispielsweise Metall­ oberflächen gleichzeitig zu entfetten und gegen Korrosion zu schützen.
Die folgenden Beispiele sollen den Gegenstand der Erfindung näher erläutern, ohne ihn darauf einzuschränken.
Beispiele I. Verzeichnis der eingesetzten Stoffe
Ölkörper
Di-n-Octylether
Inhibitoren
PSNa (Petronate CR) C16/18-Petrolsulfonat-Natriumsalz, 62 gew.-%ige Lösung in Mineralöl, Fa.Witco;
PSCa (Ca-Petronate HMW) C16/18-Petrolsulfonat-Calciumsalz, 45 gew.-%ige Lösung in Mineralöl, Fa.Witco;
SRNa, Sulforüböl-Natriumsalz, 45 gew.-%ige wäßrige Lösung;
SRCa, Sulforüböl-Calciumsalz, 55 gew.-%ige wäßrige Lösung;
SROa, Sulforüböl-Octylaminsalz, wasserfrei
SRSa, Sulforüböl-Stearylaminsalz, wasserfrei
Emulgator
Laurylalkohol-10EO
Co-Emulator
Laurylalkohol.
Die Rezepturen der Beispiel 1 bis 8 enthielten jeweils
80 bis 87 Gew.-% Dialkylether;
8 bis 15 Gew.-% Korrosionsinhibitor;
4 Gew.-% Emulgator
1 Gew.-% Co-Emulgator
und wurden entweder wasserfrei (100 gew.-%ig) oder in Form einer 20 gew.-%igen wäßrigen Dispersion eingesetzt.
II. Beschreibung des Kondensationswasser-Klimatests
Beim Kondensationswasser-Klimatest nutzt man die Kondensation der Luftfeuchte auf Probenoberflächen, deren Temperaturen durch Abstrahlung auf die Wände der Prüfkammer kleiner als die der gesättigten Prüfraumluft sind, zur Beurteilung von Korrosionserscheinungen. Der Test wurde gemäß DIN 50 017-KTw unter folgenden Bedingungen durchgeführt:
Temperatur
max. 40°C
Länge des Testzyklus 8 h bei 40°C (Tür geschlossen)
16 h Raumtemperatur (Tür geöffnet)
Probenmaterial Karosseriestahlbleche ST 1405,
Abmessungen 10 × 5 cm
Die Prüfbleche wurden zunächst mit Aceton entfettet und an­ schließend in die Testrezepturen getaucht. Nach einer Ab­ tropfzeit von 24 h wurden die Bleche in einer Klimakammer über 1 bis 25 Testzyklen bewittert. Nach jedem Testzyklus wurde der Korrosionsgrad (KG) nach folgendem Schema optisch bewertet:
KG = 0 : keine Korrosion
KG = 1 : bis 1% Korrosion
KG = 2 : bis 5% Korrosion
KG = 3 : bis 25% Korrosion
KG = 4 : < 25% Korrosion.
Die Ergebnisse der Versuche in der Klimakammer sind in Tab. 1 zusammengefaßt. In der Spalte "Korrosionsgrad nach Testzyk­ len" ist für die erfindungsgemäßen Mittel (Beispiele 1 bis 8) sowie für die Vergleichsversuche (V1, V2) die Zahl der Test­ zyklen angegeben, nach der sich der entsprechende Korrosi­ onsgrad einstellte.
Tabelle 1
Korrosionstests; Prozentangaben als Gew.-%
V1 wurde ohne Korrosionsschutzmittel durchgeführt; für V2 wurde in der Rezeptur aus Beispiel 1 Di-n-octylether gegen Pioneer-Weißöl ausgetauscht.

Claims (9)

1. Korrosionsschutzmittel enthaltend
  • a) Dialkylether der Formel (I) R1-O-R2 (I)in der R1 und R2 unabhängig voneinander für aliphati­ sche, lineare oder verzweigte Kohlenwasserstoffreste mit 6 bis 22 Kohlenstoffatomen und 0, 1, 2 oder 3 Doppelbindungen steht,
  • b) Korrosionsinhibitoren,
  • c) Emulgatoren und
  • d) gegebenenfalls Co-Emulgatoren.
2. Korrosionsschutzmittel nach Anspruch 1, dadurch gekenn­ zeichnet, daß sie als Ölkörper Dialkylether der Formel (I) enthalten, in der R1 und R2 für Octyl- und/oder 2- Ethylhexylreste stehen.
3. Korrosionsschutzmittel nach Anspruch 1, dadurch gekenn­ zeichnet, daß sie als Korrosionsinhibitoren Carbonsäuren der Formel (II) enthalten, R3-COOH (II)in der R3 für einen aliphatischen, linearen oder ver­ zweigten Kohlenwasserstoffrest mit 5 bis 23 Kohlenstoff­ atomen und 0 bzw. 1 bis 5 Doppelbindungen oder eine R4-Ph-COCH=CH-Gruppe, R4 für einen linearen oder ver­ zweigten Alkylrest mit 8 bis 18 Kohlenstoffatomen und Ph für eine Phenylgruppe steht.
4. Korrosionsschutzmittel nach Anspruch 1, dadurch gekenn­ zeichnet, daß sie als Korrosionsinhibitoren Petrolsulfo­ nate enthalten.
5. Korrosionsschutzmittel nach Anspruch 1, dadurch gekenn­ zeichnet, daß sie als Korrosionsinhibitoren Sulfierungs­ produkte ungesättigter Fettsäureglyceridester der Formel (III) enthalten, in der R5CO für einen ungesättigten Acylrest mit 16 bis 24 Kohlenstoffatomen und 1 bis 5 Doppelbindungen und R6CO und R7CO unabhängig voneinander für Acylreste mit 6 bis 24 Kohlenstoffatomen und 0 oder 1 bis 5 Doppelbindungen steht.
6. Korrosionsschutzmittel nach Anspruch 1, dadurch gekenn­ zeichnet, daß sie als Emulgatoren Anlagerungsprodukte von Ethylen- und/oder Propylenoxid an Verbindungen mit aciden Wasserstoffatomen oder Fettsäureester enthalten.
7. Korrosionsschutzmittel nach Anspruch 1, dadurch gekenn­ zeichnet, daß sie als Co-Emulgatoren Fettalkohole der Formel (IV) enthalten, R8-OH (IV)in der R8 für Alkyl- und/oder Alkenylreste mit 6 bis 22 Kohlenstoffatome steht.
8. Korrosionsschutzmittel nach Anspruch 1, dadurch gekenn­ zeichnet, daß sie 10 bis 96 Gew.-% Dialkylether,
2 bis 25 Gew.-% Korrosionsinhibitoren,
2 bis 15 Gew.-% Emulgatoren,
0 bis 15 Gew.-% Co-Emulgatoren und
0 bis 86 Gew.-% Wasserenthalten.
9. Verwendung von Dialkylethern der Formel (I) als Ölkörper bei der Herstellung von Korrosionsschutzmitteln.
DE4240945A 1992-11-06 1992-12-07 Korrosionsschutzmittel Withdrawn DE4240945A1 (de)

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DE4240945A DE4240945A1 (de) 1992-12-07 1992-12-07 Korrosionsschutzmittel
EP93923564A EP0667891A1 (de) 1992-11-06 1993-10-28 Dialkylether in metalloberflächen-behandlungsmitteln
PCT/EP1993/002990 WO1994011469A1 (de) 1992-11-06 1993-10-28 Dialkylether in metalloberflächen-behandlungsmitteln

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002714A1 (de) * 1993-07-16 1995-01-26 Henkel Kommanditgesellschaft Auf Aktien Mittel zum reinigen und passivieren von metalloberflächen
WO1995002713A1 (de) * 1993-07-16 1995-01-26 Henkel Kommanditgesellschaft Auf Aktien Verfahren zur herstellung von o/w-emulsionen zum reinigen und passivieren von metalloberflächen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002714A1 (de) * 1993-07-16 1995-01-26 Henkel Kommanditgesellschaft Auf Aktien Mittel zum reinigen und passivieren von metalloberflächen
WO1995002713A1 (de) * 1993-07-16 1995-01-26 Henkel Kommanditgesellschaft Auf Aktien Verfahren zur herstellung von o/w-emulsionen zum reinigen und passivieren von metalloberflächen

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