EP0162875A1 - Corrosion inhibitors for aluminium. - Google Patents

Corrosion inhibitors for aluminium.

Info

Publication number
EP0162875A1
EP0162875A1 EP84904122A EP84904122A EP0162875A1 EP 0162875 A1 EP0162875 A1 EP 0162875A1 EP 84904122 A EP84904122 A EP 84904122A EP 84904122 A EP84904122 A EP 84904122A EP 0162875 A1 EP0162875 A1 EP 0162875A1
Authority
EP
European Patent Office
Prior art keywords
acid
corrosion inhibitors
aluminium
triazoles
aluminum
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
Application number
EP84904122A
Other languages
German (de)
French (fr)
Other versions
EP0162875B1 (en
Inventor
Josef Penninger
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 AT84904122T priority Critical patent/ATE40839T1/en
Publication of EP0162875A1 publication Critical patent/EP0162875A1/en
Application granted granted Critical
Publication of EP0162875B1 publication Critical patent/EP0162875B1/en
Expired legal-status Critical Current

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
    • C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids

Definitions

  • the invention relates to corrosion inhibitors for aluminum in aqueous systems based on 3-amino-5-alkyl-1,2,4-triazoles in combination with aminotrimethylenephosphonic acid.
  • alkali silicates or sodium benzoate.
  • suitable additives such as alkali silicates or sodium benzoate.
  • alkali silicates show a good activity in the neutral range and especially in the case of alkali silicates in the basic range.
  • alkali silicates are unusable, while the desired protection can only be achieved with sodium benzoate at high concentrations.
  • Triazoles are particularly suitable, the alkyl radical of which has 2 to 10, preferably 7 to 9, carbon atoms.
  • ... n is from 10: 1 to 1: 1, preferably 5: 1, into consideration.
  • aminotrimethylenephosphonic acid has also proven to be particularly suitable, while such effects are not obtained with other commercially available phosphonic acids, such as 1-hydroxyethane-1,1-diphosphonic acid or 2-phosphonobutane-1,2,4-tricarboxylic acid.
  • the mixtures of 3-amino-5-alkyl-1,2,4-triazoles and aminotrimethylenephosphonic acid described are used in amounts of 50 to 1,000 g / m 3 , preferably 200 to 500 g / m 3 .
  • aminoalkyl-1,2,4-triazoles which are used are prepared by methods known per se, for example by reacting fatty acid with aminoguanidine hydrogen carbonate. However, the preparation of these compounds is not the subject of this application.
  • the corrosion protection properties are determined in the manner described below.
  • test strips 80 x 15 x 1 mm are placed in a 1-1 test vessel, the 800 ml test water and a defined one
  • the corrosion protection value S was justified from the weight loss.
  • test water used as a corrosive medium was produced according to DIN 51360/2 and adjusted to a pH of 1 with concentrated sulfuric acid.
  • the table below shows the inhibitors used, their concentration and the corrosion protection achieved in%.
  • the data given under order number 7 corresponds to the object of registration.

Abstract

On utilise des 3-amino-5-alkyl-1,2,4 triazols en combinaison avec l'acide aminotriméthylènephosphonique comme inhibiteurs de corrosion de l'aluminium dans des systèmes aqueux à réaction acide.3-Amino-5-alkyl-1,2,4 triazols are used in combination with aminotrimethylenephosphonic acid as corrosion inhibitors of aluminum in acid-reacting aqueous systems.

Description

"Korrosionsinhibitoren für Aluminium" "Corrosion Inhibitors for Aluminum"
Gegenstand der Erfindung sind Korrosionsinhibitoren für Aluminium in wäßrigen Systemen auf Basis von 3-Amino- 5-alkyl-1,2,4-triazole in Kombination mit Aminotrimethylenphosphonsäure.The invention relates to corrosion inhibitors for aluminum in aqueous systems based on 3-amino-5-alkyl-1,2,4-triazoles in combination with aminotrimethylenephosphonic acid.
Es ist bekannt, die Korrosion von Aluminium in wäßrigen Systemen durch geeignete Zusätze, wie Alkalisilikate oder Natriumbenzoat, herabzusetzen. Derartige Verbindungen zeigen eine gute Wirksamkeit im neutralen und insbesondere bei Alkalisilikaten im basischen Bereich. Im sauren Bereich dagegen sind Alkalisilikate unbrauchbar, während mit Natriumbenzoat nur mit hohen Konzentrationen der angestrebte Schutz erreichbar ist.It is known to reduce the corrosion of aluminum in aqueous systems by means of suitable additives, such as alkali silicates or sodium benzoate. Such compounds show a good activity in the neutral range and especially in the case of alkali silicates in the basic range. In the acidic range, however, alkali silicates are unusable, while the desired protection can only be achieved with sodium benzoate at high concentrations.
Es wurde nun gefunden, daß man über einen weiten sauren Bereich (pH-1 -6) als Korrosionsinhibitoren für Aluminium in wäßrigen Systemen ein Gemisch aus a) 3-Amino-5-alkyl-1,2,4-triazolen und b) Aminotrimethylenphosphonsäure mit ausgezeichneten Ergebnissen verwenden kann.It has now been found that a mixture of a) 3-amino-5-alkyl-1,2,4-triazoles and b) aminotrimethylenephosphonic acid is used over a wide acid range (pH-1 -6) as corrosion inhibitors for aluminum in aqueous systems can use with excellent results.
Insbesondere sind Triazole geeignet, deren Alkylrest 2 bis 10, vorzugsweise 7 bis 9, C-Atome aufweisen.Triazoles are particularly suitable, the alkyl radical of which has 2 to 10, preferably 7 to 9, carbon atoms.
Es wurde weiterhin gefunden, daß es vorteilhaft ist, wenn die zur Anwendung gelangenden Triazole im Hinblick auf die Aminotrimethylenphosphonsäure im Gewichtsverhält¬It has also been found that it is advantageous if the triazoles used are used in relation to the aminotrimethylenephosphonic acid in a weight ratio
... nis von 10 : 1 bis 1 : 1, vorzugsweise 5 : 1 , in Betracht.... nis from 10: 1 to 1: 1, preferably 5: 1, into consideration.
Dabei tritt überraschenderweise ein synergistischer Effekt ein, in dem mit der beanspruchten Kombination erheblich bessere Ergebnisse als mit den einzelnen Komponenten erzielt werden. Darüber hinaus hat sich auch Aminotrimethylenphosphonsäure als besonders geeignet erwiesen, während man mit anderen handelsüblichen Phosphonsäuren, wie 1-Hydroxyethan-1,1-diphosphonsäure oder 2-Phosphonobutan-1,2,4-tricarbonsäure, derartige Effekte nicht erhält.Surprisingly, this results in a synergistic effect in which considerably better results are achieved with the claimed combination than with the individual components. In addition, aminotrimethylenephosphonic acid has also proven to be particularly suitable, while such effects are not obtained with other commercially available phosphonic acids, such as 1-hydroxyethane-1,1-diphosphonic acid or 2-phosphonobutane-1,2,4-tricarboxylic acid.
Die Verwendung der beschriebenen Gemische aus 3-Amino-5-alkyl-1,2,4-triazolen und Aminotrimethylenphosphonsäure erfolgt in Mengen von 50 bis 1.000 g/m3, vorzugsweise 200 bis 500 g/m3.The mixtures of 3-amino-5-alkyl-1,2,4-triazoles and aminotrimethylenephosphonic acid described are used in amounts of 50 to 1,000 g / m 3 , preferably 200 to 500 g / m 3 .
Die Herstellung der Aminoalkyl-1,2,4-triazole, die zur Anwendung gelangen, erfolgt nach an sich bekannten Methoden, so beispielsweise durch Umsetzung von Fettsäure mit Aminoguanidin-hydrogen-carbonat. Die Herstellung dieser Verbindungen ist jedoch nicht Gegenstand dieser Anmeldung. The aminoalkyl-1,2,4-triazoles which are used are prepared by methods known per se, for example by reacting fatty acid with aminoguanidine hydrogen carbonate. However, the preparation of these compounds is not the subject of this application.
BeispieleExamples
Die Bestimmung der Korrosionsschutzeigenschaften erfolgt in der nachstehend beschriebenen Weise.The corrosion protection properties are determined in the manner described below.
Je drei sorgfältig vorbehandelte und gewogene Teststreifen (80 x 15 x 1 mm) werden in ein 1-1-Prüfgefäß, das 800 ml Testwasser und eine definierteThree carefully pretreated and weighed test strips (80 x 15 x 1 mm) are placed in a 1-1 test vessel, the 800 ml test water and a defined one
Menge an zu untersuchender Substanz enthält, gehängt und 18 Stunden bei Raumtemperatur und 80 Umdrehungen pro Minute darin belassen.Contains the amount of substance to be examined, hung and left in it for 18 hours at room temperature and 80 revolutions per minute.
Aus dem Gewichtsverlust wurde der Korrosionsschutzwert S, bezogen auf eine Blindprobe, berechtnet.The corrosion protection value S, based on a blank sample, was justified from the weight loss.
Das als korrosives Medium benutzte Versuchswasser wurde nach DIN 51360/2 hergestellt und mit konzentrierter Schwefelsäure auf einen pH-Wert von 1 eingestellt.The test water used as a corrosive medium was produced according to DIN 51360/2 and adjusted to a pH of 1 with concentrated sulfuric acid.
In der nachstehenden Tabelle sind jeweils die verwendeten Inhibitoren, deren Konzentration sowie der erzielte Korrosionsschutz in % wiedergegeben. Die unter der laufenden Nummer 7 angegebenen Daten entsprechen dem Anmeldungsgegenstand. The table below shows the inhibitors used, their concentration and the corrosion protection achieved in%. The data given under order number 7 corresponds to the object of registration.

Claims

Patentansprüche Claims
1. Verwendung von 3-Amino-5-alkyl-1,2,4-triazolen in Kombination mit Aminotrimethylenphosphonsäure als Korrosionsinhibitoren für Aluminium in wäßrigen, sauer reagierenden Systemen.1. Use of 3-amino-5-alkyl-1,2,4-triazoles in combination with aminotrimethylenephosphonic acid as corrosion inhibitors for aluminum in aqueous, acid-reacting systems.
2. Verwendung der Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, daß diese im Mengenverhältnis (Triazol : Phosphonsäure) von 10 : 1 bis 1 : 1 eingesetzt werden.2. Use of the compounds according to claim 1, characterized in that they are used in a ratio (triazole: phosphonic acid) of 10: 1 to 1: 1.
3. Verwendung der Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, daß diese im Mengenverhältnis 5 : 1 eingesetzt werden.3. Use of the compounds according to claim 1, characterized in that they are used in a ratio of 5: 1.
4. Verwendung der Verbindungen gemäß Anspruch 1 bis 3, dadurch gekennzeichnet, daß diese in Mengen von 50 bis 1.000 g/m3 eingesetzt werden.4. Use of the compounds according to claim 1 to 3, characterized in that they are used in amounts of 50 to 1,000 g / m 3 .
5. Verwendung der Verbindungen gemäß Anspruch 1 bis 4, dadurch gekennzeichnet, daß diese in Mengen von 200 bis 500 g/m3 eingesetzt werden. 5. Use of the compounds according to claim 1 to 4, characterized in that they are used in amounts of 200 to 500 g / m 3 .
EP84904122A 1983-11-14 1984-11-02 Corrosion inhibitors for aluminium Expired EP0162875B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84904122T ATE40839T1 (en) 1983-11-14 1984-11-02 CORROSION INHIBITORS FOR ALUMINUM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3341152 1983-11-14
DE19833341152 DE3341152A1 (en) 1983-11-14 1983-11-14 CORROSION INHIBITORS FOR ALUMINUM

Publications (2)

Publication Number Publication Date
EP0162875A1 true EP0162875A1 (en) 1985-12-04
EP0162875B1 EP0162875B1 (en) 1989-02-15

Family

ID=6214286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84904122A Expired EP0162875B1 (en) 1983-11-14 1984-11-02 Corrosion inhibitors for aluminium

Country Status (5)

Country Link
US (1) US4647429A (en)
EP (1) EP0162875B1 (en)
JP (1) JPS61500447A (en)
DE (2) DE3341152A1 (en)
WO (1) WO1985002207A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4904901A (en) * 1984-12-03 1990-02-27 Lumel, Inc. Electrolumescent panels

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701031C2 (en) * 1997-01-15 1998-12-10 Henkel Kgaa Use of 3-amino-5-alkyl-1,2,4-triozoles as silver protection agents
DE19758262A1 (en) * 1997-12-31 1999-07-08 Henkel Kgaa Granular component containing alkylaminotriazole for use in machine dishwashing detergents (MGSM) and process for its production
JP2010070790A (en) * 2008-09-17 2010-04-02 Chiyoda Chemical Kk Discoloration preventing treatment method for aluminum-based metal
US9243333B2 (en) * 2012-09-27 2016-01-26 The United States Of America, As Represented By The Secretary Of The Navy Coated aluminum alloy pigments and corrosion-resistant coatings

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
US3553101A (en) * 1968-05-17 1971-01-05 Exxon Research Engineering Co Prevention of corrosion using heterocyclic nitrogen compounds
GB1222133A (en) * 1968-05-25 1971-02-10 Geigy Uk Ltd Inhibition of corrosion of copper and its alloys using 3-amino-1:2:4-triazole
AT276897B (en) * 1968-08-01 1969-12-10 Henkel & Cie Gmbh Prevention of corrosion of aluminum and aluminum alloys in hydrochloric acid solutions
DE1917686A1 (en) * 1969-04-05 1970-10-08 Benckiser Knapsack Gmbh Method of treating water baths
US3935125A (en) * 1974-06-25 1976-01-27 Chemed Corporation Method and composition for inhibiting corrosion in aqueous systems
US4317744A (en) * 1979-04-25 1982-03-02 Drew Chemical Corporation Corrosion inhibitor
DE2934461A1 (en) * 1979-08-25 1981-03-26 Henkel KGaA, 40589 Düsseldorf CORROSION INHIBITORS FOR COLORED METALS
US4409121A (en) * 1980-07-21 1983-10-11 Uop Inc. Corrosion inhibitors
GB2094776B (en) * 1981-03-11 1984-05-16 Dearborn Chemicals Ltd Prevention of corrosion in aqueous systems
US4452758A (en) * 1981-07-08 1984-06-05 Basf Wyandotte Corporation Compositions and process for inhibiting corrosion of aluminum

Non-Patent Citations (1)

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Title
See references of WO8502207A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4904901A (en) * 1984-12-03 1990-02-27 Lumel, Inc. Electrolumescent panels

Also Published As

Publication number Publication date
WO1985002207A1 (en) 1985-05-23
US4647429A (en) 1987-03-03
JPS61500447A (en) 1986-03-13
DE3476774D1 (en) 1989-03-23
DE3341152A1 (en) 1985-05-23
EP0162875B1 (en) 1989-02-15

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