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
  • C23F11/10—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
  • C23F11/14—Nitrogen-containing compounds
• • 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
  • C23F11/14—Nitrogen-containing compounds
  • C23F11/141—Amines; Quaternary ammonium compounds
  • C23F11/142—Hydroxy amines
• • 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
  • C23F11/14—Nitrogen-containing compounds
  • C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom

Definitions

• the present invention relates to an anticorrosive agent composed of an imidazoline, a heterocyclic polyacid, at least one alkanolamine and water, and an aqueous system or an emulsion based on water and oil containing such an anticorrosive agent.
• Corrosion protection agents dissolved in organic solvents, are mainly used in this area.
• the disadvantages that occur are technical, e.g. insufficient application of anti-corrosive agents or insufficient adhesion, especially ecological ones, such as the disposal of the solvents used to remove the anti-corrosive agents.
• Canadian patent specification 1150042 discloses a corrosion-inhibiting composition for ferrous metals which contains an N-acyl sarcosine and an imidazoline as active components, a mineral oil being used as an adhesion promoter. Furthermore, from DE-OS 2304163 imidazoles are known as volatile, water-washable corrosion inhibitors.
• R2 is C1-C17 alkyl, it is straight-chain or branched alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, straight-chain or branched Pentyl, Hexyl, Heptyl, Octyl, Nonyl, Decyl, Undecyl, Dodecyl, Tridecyl, Tetradecyl, Pentadecyl, Hexadecyl or Heptadecyl.
• R2 is C2-C17 alkenyl, it is straight-chain or branched alkenyl radicals which contain one or more, but preferably one, double bond, such as, for example, vinyl, allyl, n-butenyl, isopentyl, pentenyl, hexenyl, heptenyl, Octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl or heptadecenyl, but preferably around heptadecenyl.
• R5 and R6 C1-C6-alkyl it is straight-chain or branched alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, straight-chain or branched pentyl or hexyl.
• R1, R4, R5 and R6 represent C1-C6-hydroxyalkyl, so the C1-C6-alkyl can be substituted one or more times by hydroxyl groups, but preferably simply, the substitution being possible in any position, but preferred for simple substitution is terminal.
• it is hydroxymethyl, 2-hydroxyethyl, 3-hydroxypropyl, 1,3-dihydroxyisopropyl, 2,4-dihydroxybutyl, trihydroxy-tert-butyl, 2,3,4,5-tetrahydroxypentyl or 6-hydroxyhexyl, but preferably around 2-hydroxyethyl.
• R1 is C1-C6-aminoalkyl
• the C1-C6-alkyl can be substituted one or more times by amino groups, preferably, however, once, the substitution being possible in any position, with simple substitution, however, is preferably terminal.
• it is aminomethyl, 2-aminoethyl, 2,3-diaminopropyl, 3-amino-2,2-dimethylpropyl or 6-aminohexyl.
• R1 C2-C19-carboxyalkyl and R3 C2-C6-carboxyalkyl are simply by -COOH-substituted C1-C18- or C1-C5-alkyl, the substitution in any position is possible, but is preferably terminal such as carboxymethyl, 2-carboxyethyl, 3-carboxypropyl, 4-carboxybutyl or 5-carboxypentyl, and also for R1 6-carboxyhexyl, 7-carboxyheptyl, 8-carboxyoctyl, 9-carboxynonyl, 10-carboxydecyl, 11-carboxyundecyl, 12-carboxydodecyl, 13-carboxytridecyl, 14-carboxytetradecyl, 15-carboxypentadecyl, 16-carboxyhexadecyl, 17-carboxyheptadecyl or 18-
• R1 and R3 are an amine salt of C2-C19-carboxyalkyl or of C2-C6-carboxyalkyl
• the amine is preferably an amine with up to 8 C atoms, which can optionally be substituted by -OH, such as for example methylamine, ethylamine, propylamine, butylamine, hexylamine, octylamine, mono-, di- or triethanolamine.
• R3 is an alkali salt of C2-C6-carboxyalkyl, it is, for example, the sodium, potassium or lithium salt.
• R3 is an alkaline earth salt of C2-C6 carboxyalkal, it is, for example, the calcium or magnesium salt.
• R1 in formula I is C1-C3-hydroxyalkyl or C2-C6-aminoalkyl.
• a corrosion protection agent is particularly preferred, wherein in formula I R 1 is 2-hydroxyethyl.
• Another embodiment is a corrosion protection agent, wherein in formula I R2 is C11-C17 alkyl or C12-C17 alkenyl.
• a particularly preferred embodiment is a corrosion protection agent, wherein in formula I R2 is C11 alkyl.
• R2 in formula I means C17 alkenyl.
• a corrosion protection agent is further preferred, wherein in formula II R3 is C6-carboxyalkyl.
• R in formula III means 2-hydroxyethyl
• R5 in formula III is C1-C6-hydroxyalkyl.
• R5 in formula III means 2-hydroxyethyl
• R4 and R5 in formula III are 2-hydroxyethyl.
• R5 and R6 are C1-C6-hydroxyalkyl.
• R5 and R6 in formula III are 2-hydroxyethyl.
• component c) is a mixture of ethanolamine, diethanolamine and triethanolamine.
• Examples of compounds of the formula II are: 2,4,6-tris- (5 ⁇ -carboxypentylamino) -1,3,5-triazine 2,4,6-tris- (3 ⁇ -carboxypropylamino) -1,3,5-triazine 2,4,6-tris- (2 ⁇ -carboxyethylamino) -1,3,5-triazine 2,4,6-tris (carboxymethylamino) -1,3,5-triazine 2,4,6-tris- (3 ⁇ -carboxybutylamino) -1,3,5-triazine
• Examples of compounds of the formula III are: Monoethanolamine 3-aminopropanol 2-dimethylaminoethanol 1-dimethylamino-2-propanol 2-dibutylaminoethanol 2-hexylaminobutanol Diethanolamine Triethanolamine or mixtures thereof.
• the corrosion inhibitor according to the invention can be prepared, for example, by adding a heterocyclic polyacid of the formula II to a mixture of at least one alkanolamine of the formula III and water with stirring at room temperature and then adding an imidazoline of the formula I, likewise with stirring at room temperature.
• the anti-corrosion agent according to the invention is of liquid nature. Depending on the ratio of a: b: c: d, however, its viscosity changes.
• the ratio of b: c: d is advantageously chosen so that the mixture of the three components in question is liquid.
• the ratio of b: c: d is preferably 1: 2: 1.
• the corrosion protection agent according to the invention is extremely suitable as a temporary corrosion protection agent for iron and steel fittings, such as Body panels, and is made using ecologically sound methods such as easy to remove by washing with water.
• the anti-corrosion agent according to the invention is preferably used as a working solution in aqueous systems or in water / oil emulsions.
• the present invention also relates to a composition
• a composition comprising an aqueous system or a water / oil emulsion and a corrosion inhibitor comprising a) an imidazoline of the formula I, b) a heterocyclic polyacid of the formula II, c) at least one alkanolamine of the formula III and d ) Water.
• This composition can also be called a working solution.
• aqueous systems are water itself and mixtures of alcohols, especially polyhydric alcohols, e.g. Ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol and / or mixed glycols, with water.
• polyhydric alcohols e.g. Ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol and / or mixed glycols, with water.
• oil component in water / oil emulsions examples include mineral oils such as paraffin oils, synthetic lubricants such as synthetic hydrocarbons or mixtures of such lubricants or mineral oils.
• the working solution can be prepared by diluting the corrosion protection agent according to the invention with the aqueous system or the water / oil emulsion.
• compositions according to the invention namely the aqueous systems or water / oil emulsions (working solutions) preferably contain 0.02-5% by weight of an imidazoline of the formula I, 0.02-5% by weight of a heterocyclic polyacid of the formula II and 0 , 1-15% by weight of at least one alkanolamine of the formula III, but in particular 0.1-2% by weight of an imidazoline of the formula I, 0.1-2% by weight of a heterocyclic polyacid of the formula II and 0.5-10 % By weight of at least one alkanolamine of the formula III, based on the aqueous system or the water / oil emulsion.
• the aqueous systems or water / oil emulsions can also contain further additives, such as, for example, emulsifiers, metal passivators, rust inhibitors and / or biocides.
• Salts of sulfonic acids, salts of carboxylic acids, salts of acylated amidocarboxylic acids and salts of phosphoric acid esters are included in the sulfonic acids, salts of carboxylic acids, salts of acylated amidocarboxylic acids and salts of phosphoric acid esters.
• Polyglycol ethers of alcohols phenols such as e.g. Nonylphenol, fatty acids such as e.g. Castor oil, fatty amines, fatty acid amides and fatty acid esters of polyhydric alcohols such as Sorbitol oleic acid ester.
• Non-ferrous metals such as Non-ferrous metals, e.g. triazole, benzotriazole and their derivatives, 2-mercaptobenzothiazole, 2,5-dimercaptothiadiazole, salicylidene-propylenediamine, salts of salicylaminoguanidine.
• Non-ferrous metals e.g. triazole, benzotriazole and their derivatives, 2-mercaptobenzothiazole, 2,5-dimercaptothiadiazole, salicylidene-propylenediamine, salts of salicylaminoguanidine.
• Example 1 With stirring at room temperature to a mixture of 8 parts of triethanolamine and 4 parts of water, 4 parts of 2,4,6-tris (5 ⁇ carboxypentylamino) -s-triazine and 1 part of 2- (8-heptadecenyl) -4.5 -dihydro-1- (2-hydroxyethyl) imidazole added and stirred until a clear amber liquid has formed.
• Density at 23 ° C 1.15 g / cm3
• the working solution is obtained by diluting 3.2 parts of the above concentrate with 96.8 parts of distilled water.
• Examples 2-5 While stirring, 1 part of 2,4,6-tris (5ox-carboxypentylamino) -s-triazine is added to a mixture of 2 parts of triethanolamine and 1 part of water at room temperature and stirred until a clear liquid A has formed.
• the finished working solution is obtained by stirring at room temperature from x parts of liquid A and y parts of component a 1 (100-xy) parts of distilled water.
• Examples 6 and 7 x parts of the liquid A obtained according to Examples 2-5 and y parts of components a 1 and a 2 are stirred at room temperature into (100-xy) parts of a mixture consisting of 9 parts water and 1 part propylene glycol.
• Example 8 Testing of anti-corrosion agents for corrosion-preventing properties according to DIN 51359.
• the method according to this standard is used to determine the corrosion-preventing properties of the anti-corrosion agents on sheet steel in a condensation water constant climate at 50 ° C with continuous air supply.
• 3 steel sheets made of steel are prepared according to the American specification QQ-S-698 Grade 1009 of dimension 100x50x3 mm as follows.
• the corrosion protection agent adhering to the steel sheets is washed off with white spirit (DIN 51632) and the steel sheets are carefully checked for scars, scuffs or rust. Sheets that are not perfect are rejected. After removing the anti-corrosion agent, the steel sheets may no longer be touched by hand.
• the edges and surfaces of the steel sheets are then sanded with abrasive cloth (normal corundum with P 240 grit). With cotton wool dipped in white spirit, the dust from grinding is removed until the cotton wool remains clean.
• abrasive cloth normal corundum with P 240 grit.
• the steel sheets are then cut individually Put in white spirit at about 65 ° C for 5 minutes and then swirled in boiling propanol (2) for 10 seconds. The dry steel sheets must be kept in the desiccator and used for the test on the same day.
• the humidity chamber is set to an air flow rate of 875 1 / h ⁇ 25 1 / h, to an air temperature of (50 ⁇ 1) ° C and a relative humidity of 100%.
• the sample of a working solution of the corrosion protection agent to be tested should be at room temperature for the dipping process.
• the prepared steel sheets are removed from the desiccator with tweezers and individually immersed completely in the sample for 10 seconds with a hook, pulled out and, after a draining time of 10 seconds, immersed again in the sample with gentle swirling for 1 minute.
• the steel sheet is then suspended in a non-corrosive atmosphere at room temperature for about 2 hours, so that excess corrosion protection agent drips off and a uniform, coherent film forms from the sample on the test surface of the steel sheet to be assessed.
• the steel sheets treated in this way are introduced into the moisture chamber. The steel sheets are checked for signs of corrosion every 24 hours.
• the steel sheets taken out of the moisture chamber are rinsed off with a mixture of white spirit and pure toluene and the test surface is checked for signs of corrosion under the 100 W daylight lamp within 10 minutes.
• the degree of corrosion is determined for each test area of the steel sheets, whereby gray discoloration as well as signs of corrosion outside the test area are not taken into account. The assessment follows the following scheme:

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)

Applications Claiming Priority (2)

Publications (3)

Family

ID=4257628

Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (11)

Family Cites Families (7)

• 1987
  • 1987-08-27 EP EP87810485A patent/EP0262086B1/fr not_active Expired - Lifetime
  • 1987-08-27 DE DE8787810485T patent/DE3775685D1/de not_active Expired - Lifetime
  • 1987-08-27 ES ES198787810485T patent/ES2038208T3/es not_active Expired - Lifetime
  • 1987-08-28 US US07/091,156 patent/US4877552A/en not_active Expired - Fee Related
  • 1987-08-31 CA CA000545728A patent/CA1300868C/fr not_active Expired - Lifetime
  • 1987-09-01 BR BR8704496A patent/BR8704496A/pt unknown
  • 1987-09-02 JP JP62220081A patent/JPS6386881A/ja active Pending

Also Published As

Similar Documents

Legal Events