EP1041174B1 - Compositions inhibitrices de la corrosion contenant de la méamine - Google Patents

Compositions inhibitrices de la corrosion contenant de la méamine Download PDF

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Publication number
EP1041174B1
EP1041174B1 EP99106518A EP99106518A EP1041174B1 EP 1041174 B1 EP1041174 B1 EP 1041174B1 EP 99106518 A EP99106518 A EP 99106518A EP 99106518 A EP99106518 A EP 99106518A EP 1041174 B1 EP1041174 B1 EP 1041174B1
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Prior art keywords
acid
corrosion inhibitor
aqueous
corrosion
melamine
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EP99106518A
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German (de)
English (en)
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EP1041174A1 (fr
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Stefan Graichen
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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

Definitions

  • the invention relates to a melamine-containing anticorrosive and aqueous systems in which this anti-corrosion agent is used.
  • the free polycarboxylic acids are generally solid substances. During their manufacture, they are usually filtered out isolated from an aqueous phase. The filtered product is usually washed with water and then dried subjected. To the energy required for drying save, one has recently for use in aqueous Systems the moist filter cake, which is about 50% water contains, offered as a commercial form. The moist filter cake has the disadvantage, however, that it is not flowable. He can not to be poured or poured, but with the Bucket dosed or decanted manually. That's why too have already been proposed in the form of polycarboxylic acids use high-percentage aqueous dispersions.
  • Corrosion inhibitors also developed on the basis of melamine are already known. For example, US-A-2,485 309 methylolmelamine condensation products described but the high demands that are placed on an anti-corrosion agent today are not sufficient. About that from European patent application 0 846 690 already melamine polycarboxamides and their use as Anticorrosive known. It is for their manufacture however, the polycarboxylic acid or the like is required Polycarboxylic acid halide, the polycarboxylic anhydride or the polycarboxylic acid ester in a reaction vessel melt using heat and then, if necessary, also using an inert protective gas melamine in the Stir in the melt. This reaction generally a temperature between 120 and 180 ° C maintained.
  • the reaction product can then after cooling from the reaction vessel removed and in an aqueous alkaline solution to the anti-corrosion agent. Because this manufacture the melamine polycarboxylic acid amide was expensive the task of an equally good or better effective anti-corrosion agent to develop on the basis of melamine, in which the production of Acid amide bonds are not required.
  • a corrosion protection agent the melamine and an organic polycarboxylic acid of the formula I. in a molar ratio of 1: 1.5 to 1: 5, preferably in a molar ratio of 1: 3, where X is a straight-chain or branched alkylene or alkylidene radical having 1 to 20 carbon atoms, which carry one or more hydroxyl or carboxyl groups and a cyclopentylene , Cyclohexylene or phenylene group.
  • Suitable polycarboxylic acids are butanedioic acid, pentanedioic acid, hexanedioic acid, the heptanedioic acid, the nonanedioic acid and particularly preferably also as Decanedioic acid called sebacic acid.
  • the carbon chain of these dicarboxylic acids can also contain a cyclopentylene, cyclohexylene or phenylene radical.
  • Dicarboxylic acid can be combined in the anticorrosive agent according to the invention be included with melamine.
  • Polycarboxylic acids in particular mixtures of several dicarboxylic acids, can be used in the anti-corrosion agent according to the invention can be used.
  • polycarboxylic acids mentioned can also be monocarboxylic acids
  • Example the isononanoic acid may be present in the mixture.
  • the carboxylic acids mentioned react with melamine in aqueous solution Salt formation.
  • the resulting salts are characterized by sufficient solubility in water so that aqueous solutions can be prepared that these compounds in an amount of 0.1 to 10 percent by weight contain.
  • the anti-corrosion agent according to the invention is preferred used in aqueous systems.
  • aqueous system are water circuits, for example cooling water circuits, Circulations of aqueous machine fluids and coolants that are used during drilling, grinding, milling, Turning, cutting, sawing, grinding, thread cutting or used in rolling and drawing metals.
  • Antifreeze or hydraulic fluids Glycol water base as well as aqueous paints, for example Dispersion paints or aqueous powder coatings can be used with the Corrosion protection agent according to the invention anticorrosive be equipped.
  • the anti-corrosion agent according to the invention can be in aqueous Systems as a sole addition or in combination with others Additives are used.
  • Additives are used.
  • Known corrosion inhibitors such as Phosphonates, phosphonocarboxylic acids or phosphinocarboxylic acids, N-acyl sarcosines, imidazolines, triethanolamine or fatty amines.
  • Copper passivators such as water-soluble benzotriazoles, Methylene-bis-benzotriazoles or 2-mercaptobenzothiazoles can be added.
  • Dispersants and Carriers such as poly (meth) acrylic acid and its salts, hydrolyzed polyacrylonitrile, polyacrylamide and the like Copolymers, lignin sulfonic acid and its salts, starch and Starch derivatives, cellulose, alkylphosphonic acids, 1-aminoalkyl-1,1-diphosphonic acids and their salts, polymaleic acids and other polycarboxylic acids or alkali phosphates are added.
  • additives can be precipitants, such as alkali phosphates or alkali carbonates, oxygen scavengers such as Alkali sulfates or hydrazine, complexing agents such as Nitrilotriacetic acid or ethylenediamine tetraacetic acid and their salts or anti-foaming agents such as distearyl sebacic acid diamide, Distearyladipinklarediamid or ethylene oxide or Propylene oxide condensation products of such amides as well Fatty alcohols and their ethylene oxide condensation products.
  • precipitants such as alkali phosphates or alkali carbonates, oxygen scavengers such as Alkali sulfates or hydrazine
  • complexing agents such as Nitrilotriacetic acid or ethylenediamine tetraacetic acid and their salts or anti-foaming agents
  • the anti-corrosion agents according to the invention can also in Form of aqueous dispersions can be used.
  • Dispersants are suitable for all surface-active compounds, especially anionic and non-ionic surfactants.
  • Such dispersions can be thickened to be stabilized, with stabilizers in particular modified polysaccharides from xanthan, alginate, guar or Cellulose type used. This also includes cellulose ethers such as Methyl cellulose or carboxymethyl cellulose and heteropolysaccharides.
  • the dispersions according to the invention can still more Contain auxiliaries, for example hydrotropic agents such as Urea or sodium xylene sulfonate; Antifreeze like Ethylene or propylene glycol, diethylene glycol, glycerin or sorbitol; Biocides such as chloroacetamide, formalin or 1,2-benzisothiazolin-3-one or complexing agents.
  • hydrotropic agents such as Urea or sodium xylene sulfonate
  • Antifreeze like Ethylene or propylene glycol, diethylene glycol, glycerin or sorbitol
  • Biocides such as chloroacetamide, formalin or 1,2-benzisothiazolin-3-one or complexing agents.
  • the dispersions thus produced are at Room temperature as well as several at temperatures up to 40 ° C Stable for months. They keep their fluidity and segregate not yourself. That is for the storage and transportation of the Dispersions are an important property. For using the Dispersions have the advantage that they are like liquids can be handled and become very quickly in alkaline water Systems.
  • Corrosion protection agent was carried out according to the Regulation of DIN 51360 part II. Serve as a measure of corrosion the corrosion drawings on a round filter paper, which when exposed to artificially corrosive water on gray cast iron chips in the presence of the anti-corrosion agent arise. The test is carried out in the following way:
  • water with a total hardness of 3.58 mmol is made from CaCl 2 x 6 H 2 O and MgSO 4 x 7 H 2 O, mixed with 3% of the above-mentioned corrosion protection agent and with this Solution that wets gray cast iron chips distributed on round filters in a Petri dish. After a dwell time of 2 hours at room temperature, the gray cast iron chips are removed from the round filter, the round filter rinsed and dried, and the degree of corrosion is then determined visually in accordance with the table in DIN 51360, Part II. The results obtained are shown in the table above.

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  • 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)
  • Anti-Oxidant Or Stabilizer Compositions (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (12)

  1. Inhibiteur de corrosion, caractérisé en ce qu'il contient de la mélamine et un acide polycarboxylique organique de formule I
    Figure 00150001
    en un rapport molaire de 1:1,5 à 1:5, dans laquelle X représente un radical alkylène ou alkylidène linéaire ou ramifié renfermant de 1 à 20 atomes de carbone, pouvant porter un ou plusieurs groupes hydroxy ou carboxy et pouvant renfermer un groupe cyclopentylène, cyclohexylène ou phénylène.
  2. Inhibiteur de corrosion selon la revendication 1, caractérisé en ce que le rapport molaire de mélamine : acide polycarboxylique est de 1:3.
  3. Inhibiteur de corrosion selon les revendications 1 et 2, caractérisé en ce qu'il contient un mélange de plusieurs acides polycarboxyliques différents.
  4. Inhibiteur de corrosion selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il contient un ou plusieurs acides dicarboxyliques en tant qu'acide polycarboxylique.
  5. Inhibiteur de corrosion selon la revendication 4, caractérisé en ce qu'il contient de l'acide sébacique en tant qu'acide dicarboxylique.
  6. Inhibiteur de corrosion selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il contient en outre un acide monocarboxylique.
  7. Inhibiteur de corrosion selon la revendication 6, caractérisé en ce qu'il contient de l'acide isononanoïque en tant qu'acide monocarboxylique.
  8. Système aqueux, caractérisé en ce que l'inhibiteur de corrosion des revendications 1 à 7, qui est constitué de mélamine et d'acides polycarboxyliques organiques, est présent en une quantité de 0,1 à 10 pour cent en poids.
  9. Système aqueux selon la revendication 8, caractérisé en ce qu'il contient également un ou plusieurs inhibiteurs de corrosion supplémentaires.
  10. Système aqueux selon les revendications 8 et 9, caractérisé en ce que les groupes carboxy libres sont neutralisés par des cations de métaux alcalins, ammonium ou triéthanolammonium.
  11. Système aqueux selon l'une quelconque des revendications 8 à 10, caractérisé en ce qu'il contient également des additifs supplémentaires, tels que des dispersants, des agents de précipitation, des capteurs d'oxygène, des agents complexants, des antimousses, des désinfectants, des additifs haute pression ou d'autres additifs connus, en plus d'inhibiteurs de corrosion.
  12. Système aqueux selon l'une quelconque des revendications 8 à 11, caractérisé en ce qu'il s'agit d'un circuit d'eau, d'un liquide de machine aqueux, d'un liquide hydraulique aqueux-glycolique ou d'une composition de revêtement aqueuse.
EP99106518A 1999-03-30 1999-03-30 Compositions inhibitrices de la corrosion contenant de la méamine Expired - Lifetime EP1041174B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59909853T DE59909853D1 (de) 1999-03-30 1999-03-30 Melamin enthaltendes Korrosionsschutzmittel
AT99106518T ATE270352T1 (de) 1999-03-30 1999-03-30 Melamin enthaltendes korrosionsschutzmittel
EP99106518A EP1041174B1 (fr) 1999-03-30 1999-03-30 Compositions inhibitrices de la corrosion contenant de la méamine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99106518A EP1041174B1 (fr) 1999-03-30 1999-03-30 Compositions inhibitrices de la corrosion contenant de la méamine

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EP1041174A1 EP1041174A1 (fr) 2000-10-04
EP1041174B1 true EP1041174B1 (fr) 2004-06-30

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003080895A1 (fr) * 2002-03-18 2003-10-02 The Lubrizol Corporation Sels inhibiteurs de la corrosion, concentres et fluides de travail de metaux en contenant
JP2007016167A (ja) * 2005-07-08 2007-01-25 Taiyu Kk 水溶性金属工作油剤
US7632458B2 (en) * 2006-01-31 2009-12-15 General Electric Company Corrosion inhibitor treatment for closed loop systems
GB0601961D0 (en) 2006-01-31 2006-03-15 Bp Exploration Operating Method
CN102296298B (zh) * 2011-08-30 2012-12-05 吴江市精工铝字制造厂 一种盐水介质的铝合金缓蚀剂
CA2866125C (fr) 2012-03-08 2020-07-21 The Lubrizol Corporation Revetements en phase aqueuse, compositions et leurs procedes conferant une protection anticorrosion amelioree

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485309A (en) * 1947-04-05 1949-10-18 Standard Oil Dev Co Corrosion prevention
US3976588A (en) * 1975-01-14 1976-08-24 Center For New Product Development Detergents providing faster drying of cleansed substrates
US4402907A (en) * 1980-08-13 1983-09-06 Ciba-Geigy Corporation Triazine carboxylic acids as corrosion inhibitors for aqueous systems
US4647392A (en) * 1985-12-27 1987-03-03 Texaco Inc. Monobasic-dibasic acid/salt antifreeze corrosion inhibitor
GB9201165D0 (en) * 1992-01-18 1992-03-11 Ciba Geigy Corrosion inhibiting compositions
DE19648843C2 (de) * 1996-11-26 1998-09-17 Zts Chemie Gmbh Melamin-polycarbonsäureamide und ihre Verwendung als Korrosionsschutzmittel

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DE59909853D1 (de) 2004-08-05
ATE270352T1 (de) 2004-07-15

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