WO1996039549A1 - Procede d'inhibition de la corrosion de metaux dans des systemes d'alimentation en eau a grande echelle - Google Patents

Procede d'inhibition de la corrosion de metaux dans des systemes d'alimentation en eau a grande echelle Download PDF

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Publication number
WO1996039549A1
WO1996039549A1 PCT/US1996/006158 US9606158W WO9639549A1 WO 1996039549 A1 WO1996039549 A1 WO 1996039549A1 US 9606158 W US9606158 W US 9606158W WO 9639549 A1 WO9639549 A1 WO 9639549A1
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Prior art keywords
water
acid
ppm
salt
morpholine
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PCT/US1996/006158
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English (en)
Inventor
Ronald Liudas Oleka
Sandra Lynn Edmondson
Peter Fung
Vladimir Jovancicevic
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Betzdearborn Inc.
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Publication of WO1996039549A1 publication Critical patent/WO1996039549A1/fr

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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
    • C23F11/12—Oxygen-containing compounds
    • C23F11/124—Carboxylic acids
    • C23F11/126—Aliphatic 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
    • 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
    • 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
    • C23F11/143—Salts of amines

Definitions

  • This invention relates to a method for inhibit ⁇ ing metal corrosion in a closed water system such as is found in industrial, commercial or institutional systems, including without limitation HVAC systems of hospitals, universities, office towers, factories, shopping malls and the like. More particularly, the invention relates to a method for inhibiting metal corrosion in such a system by- maintaining therein an effective amount of at least one water soluble fatty acid salt as hereinafter more particu ⁇ larly defined. The invention further relates to certain corrosion inhibiting compositions, the aqueous formulations containing the same and the systems produced therefrom by dilution with water.
  • the corrosion inhibiting formulations for use in the aforesaid closed water systems comprise at least one water soluble fatty acid salt selected from salts having the formulae
  • R is straight or branched chain alkyl having at least 6 carbon atoms and preferably 6 to 18 carbon atoms or hydroxyalkyl having at least 6 and preferably 6 to 18 carbon atoms
  • X is a cation (ammonium, alkali metal, amine or any other basic compound which forms a salt with said fatty acid)
  • R 1 is alkyl or hydroxyalkyl having at least 2 carbon atoms, and preferably 2 to 18 carbon atoms and n is 2 or 3 and optionally at least one additive selected from the group of alkali metal borates, alkali metal molybdates, hydrocarbyl triazoles, silicates and amines such as ethylenediamine, morpholine, pyridine and pyrolidine.
  • the corrosion inhibiting compositions of the invention in addition to their effectiveness for their intended purpose are also environmentally acceptable because of their low toxicity and reduced adverse effect when discharged into a waste stream. While a variety of corrosion inhibitors have been proposed, many of the conventional corrosion inhibitors have themselves been found to cause problems when employed in corrosion inhib ⁇ iting formulations. For example phosphate compounds have been found to be good corrosion inhibitors but attendant problems may result from the use of phosphate compounds. For example, the dilution of a corrosion inhibiting formulation containing phosphate corrosion inhibitors with hard water will cause the precipitation of insoluble alkali earth phosphate salts from the aqueous corrosion inhibiting aqueous solutions.
  • the precipitation causes rapid depletion of the phosphate in solution and in turn causes a decrease in corrosion protection.
  • the precipitating solids will scale and eventually have detrimental effects on the system.
  • the use of various anti-precipitation additives in phosphate containing anti- corrosion formulations has been proposed, however, the uses of such additives increases the overall cost of the formulation.
  • several governmental authori ⁇ ties have banned the use of phosphates in aqueous systems because of their detrimental effects to the environment when the water in the system has to be discharged.
  • Other conventional corrosion inhibitors have problems associated with their use in aqueous corrosion inhibiting systems, as for example, the amine and nitrite compounds which are often employed as corrosion inhibitors may form dangerous nitroso compounds particularly when they are used togeth ⁇ er.
  • Closed systems are constituted of a water filled closed loop, typically constructed of steel pipes in which there is minimal air contact with the water in the system.
  • Air contact can and does occur as for example if the system has a sump open to the air.
  • the corrosion inhibitor(s) employed therefore have to be stable against decomposition and/or oxidation and above all are required to be effective to present oxidation of metal i.e., corro ⁇ sion.
  • the metal of most concern is typically mild steel although corrosion protection for brass, solder, copper, cast iron, aluminum, magnesium and their alloys is also important as components of the systems such as valves, heat exchangers, etc. are constructed from these metals.
  • Still another area of concern for closed system water treatment is that the corrosion inhibitor used for example, in a building's hot water heating system and/or air conditioning chiller system must be stable in perfor- mance for prolonged periods of time, by which is meant years. It is most desirable to treat the system once and for the system to require minimal additional treatment or monitoring over this extended period.
  • Systems of the type contemplated herein are frequently very complicated in construction and can contain miles of steel pipe, for example when installed in a large building complex. Leaks and water losses do occur. These leaks in turn reduce the amount of corrosion inhibitor in the system.
  • Nitrites and borate-nitrites have heretofore been employed as corrosion inhibitors in closed systems and particularly have been used together with amine compounds . Their use is characterized by a relatively high inorganic solids content which gives rise to a solids buildup in the case where a leak has occurred. Such solids can cause caustic crevice corrosion at fitting connections and also on the external surfaces of the equipment as they usually are highly alkaline.
  • the use of nitrites is furthermore undesirable as they are microbio ⁇ logical nutrients and their discharge can cause eutrophication. Treatment solutions containing nitrites are frequently unstable in use as there are microorganisms present in the system which consume the nitrites decreasing or eliminating the corrosion inhibitor from the system.
  • organophosphorus compounds in the formulations is also undesir ⁇ able as such compounds support microbiological growth in as much as they constitute an essential nutrient for microorganisms .
  • the proposed use of organophosphorus compounds has also been found to be undesirable as the organophosphorus compounds eventually convert to phosphate which in turn gives rise to precipitates of insoluble alkaline earth metal phosphate salts by reaction with the soluble calcium present in the water. This precipitation causes rapid depletion of the phosphate in the treatment solution resulting in a decrease in corrosion protection.
  • U.S. Patent No. 4,759,864 describes the use of C 6 -Ci2 aliphatic monobasic acids or their alkali metal salts in automotive antifreeze formulations.
  • U.S. Patent No. 5,269,956 is directed to corro ⁇ sion inhibiting compositions including potassium, an aliphatic monocarboxylate having at least 5 carbon atoms, hydrocarbyl triazole and one or more of the group of sili ⁇ cates, phosphates or borates useful in heat transfer fluids, antifreezes and for corrosion inhibition in motor vehicle engines.
  • U.S. Patent No 4,851,145 the combination of alkylbenzoic acid with monobasic and dibasic fatty acids is disclosed for use in corrosion inhibiting antifreeze formulations.
  • Canadian Patent No. 1,118,990 describes corrosion inhibitors for closed water systems comprising at least one molybdate and at least one amine such as morpholine and ethylenediamine.
  • a supplementary inhibitor such as benzotriazole, sodium polymethacrylate or a copolymer of a sulphonatated polystyrene and malic anhydride.
  • Canadian Patent No. 1,116,026 relates to inher ⁇ ently bactericidal metal working fluids having corrosion inhibiting activity composed of boric acid, an alkali tetraborate, an alkanol amine, pelargonic acid, a non ⁇ ionic surfactant and water.
  • the compositions are metal working fluids and for this application must be used in such high concentration as would render them unsuitable for large scale closed water treatment systems.
  • Several of the above-noted references disclose the use of monobasic fatty acids and dibasicarboxylic acids.
  • the sole reference directed to closed water systems (Canadian Patent 1,118,990) however does not, but rather teaches the use of a combination of molybdate and amine as a corrosion inhibitor for closed water systems.
  • the references dealing with fatty acid and dicarboxylic - acid use teach their use in automative antifreezes and metal-working fluids where they are used in much higher concentrations than that taught herein.
  • Water treatment for closed water systems has different requirements as compared to water treatment applicable to automotive internal combination engines or metal working or antifreeze applications and the common practices of the latter are not applicable to the former.
  • Summary of the Invention The present invention is directed to a method for inhibiting metal corrosion in a closed water treatment system by supplying to and maintaining therein an effective amount of at least one water soluble fatty acid salt selected from salts having the formulae
  • R is straight or branched chain alkyl having at least 6 carbon atoms and preferably 6 to 18 carbon atoms or hydroxyalkyl having at least 6 and preferable 6 to 18 atoms
  • X is a cation such as ammonium, alkali metal, amine or any other basic compound which forms a salt with the fatty acid
  • R 1 is alkyl or hydroxyalkyl having at least 2 carbon atoms and preferably 2 to 18 carbon atoms and n is 2 or 3 and optionally at least one additive which may be a corrosion inhibitor, selected from the group of alkali metal borates, alkali metal molybdates, hydrocarbyl triazoles, silicates, morpholine, ethylenediamine, pyridine and pyrrolidine.
  • Typical straight chain alkyl groups are hexyl, octyl, decyl, nonyl dodecyl, hexadecyl and octadecyl.
  • Examples of branched chain alkyl groups include ethylhexyl, trimethylhexyl, and ethylnonyl.
  • the hydroxy alkyl groups are analogous to the aforenoted alkyl groups except for the presence of the hydroxy groups. While monohydroxyalkyl groups predominate, dihydroxyalkyl groups such as in malic acid and tartaric acid and trihydroxyalkyl groups are equally suitable. Mixtures of two or more of the salts of the various acids can also be used.
  • the acids are used in the form of their water soluble salts i.e., X in the formulae is a salt forming cation.
  • Illustrative salts are the sodium, potassium. lithium, ammonium and amine salts.
  • Particularly useful salts include the alkali metal, ammonium, alkylolammonium (e.g. monoethanol ammonium or triethanol ammonium salts) .
  • X is an amine, it corresponds to the formula ( R ) 3 N
  • each R 11 is independently hydrogen, C ⁇ _ ⁇ 0 alkyl or C 2 - ⁇ o hydroxyalkyl.
  • the cation is ammonium.
  • (R ⁇ :L ) 3 N can also be a primary, secondary or tertiary monoamine.
  • at least one of R 11 is di- or tri- (hydroxyalkyl) and (R 1:I ) 3 N is then for example diethanolamino, diethylaminoethanol or triethanolamino.
  • R 11 ) can also be designate an alicyclic group as for example cyclohexylamino, cyclopropylamino, and cyclopentylamino.
  • R 11 ) 3 N can also represent a heterocyclic group as for example morpholino, pyridino, pyrrolidino and the like.
  • the salts of dicarboxylic and tricarboxylic acids which are used in formulating the corrosion inhibitors of the present invention are represented by the formula R 1 (COOX) n , wherein X has the meaning as set forth above and R 11 is straight or branched chain alkyl having 2 or more carbon atoms and preferably not more than 18 carbon atoms .
  • straight chain alkyl are ethyl, propyl, butyl, pentyl, hexyl, octyl, onyl, decyl, undecyl, dodecyl, hexadecyl and octadecyl and of the branched chain alkyl are ethylhexyl, trimethylhexyl, and the like.
  • hydroxyalkyl groups are hydroxyethyl, hydroxypropyl, hydroxyhexyl and the like.
  • acids preferred for use herein include: valeric, caproic, caprylic, capric, pelargonic, heptanoic, octanoic, isovaleric, 2-ethyl- hexanoic, nonanoic, sebacic, dodecanedioic, neodecanoic, succinic, undecanedioic, isononanoic, trialkylacetic, tartaric acid, palmitic, stearic, malic, citric, malonic, glutaric and adipic, and the like.
  • the corrosion inhibiting compositions of the invention are water soluble and can be used in the form of aqueous compositions including therein a substantial percentage of water. More particularly, they can be utilized per se or in the form of concentrates to be diluted with water on site.
  • the aqueous system has incorporated therein a corrosion inhibiting amount of at least one of the above described monocaboxylic and/or dicarboxylic acid salts.
  • a corrosion inhibiting amount preferably is from about 1 part to about 1000 parts of corrosion inhibitor per million parts of the aqueous treatment system, more preferably about 50 parts to about 500 parts and most preferably about 300 parts of corrosion inhibitor per million parts of the aqueous treatment system.
  • aqueous systems of the present invention also can contain other additives, singly or in combination to help reduce corrosion, and include additives such as alkali metal hydroxides, benzoates, silicates, nitrates, molybdates, hydrocarbyl triazoles and the like.
  • the triazole component may be any hydrocarbyl triazole such as tolyltriazole 2-methylbenzotriazole, mercaptobenzotriazole and benzotriazole.
  • the borate can be a tetraborate such as sodium tetraborate, also known as borax, potassium tetraborate and mixtures thereof, boric acid, or an alkali metal borate such as potassium borate.
  • a tetraborate such as sodium tetraborate, also known as borax, potassium tetraborate and mixtures thereof, boric acid, or an alkali metal borate such as potassium borate.
  • the silicate component must be water soluble and may be one or mixtures of the following: sodium- metasilicate pentahydrate, sodium-metasilicate nonahydrate, sodium orthosilicate pentahydrate, anhydrous sodium silicate and the like.
  • the nitrate component typically is an alkali metal nitrate such as potassium nitrate.
  • the molybdate is also typically an alkali metal molybdate such as sodium molybdate.
  • anti-scaling and dispers ⁇ ing polymers, copolymers, terpolymers and tetramers of acrylic acid may be present in the aqueous treatment solution.
  • the monomer groups which can be present are those derived form maleic anhydride, sulphonated styrene, AMPS, polymethacrylate(s) and hydro- lyzed polyacrylamides.
  • This type of additive is well known to the art for their ability to: (1) inhibit, retard or prevent objectionable scale formation on high temperature heat exchange surfaces, as would be likely to occur in hot water heating systems using unsoftened make-up water, and
  • the polymers or copolymers are water soluble and include without limitation the water soluble salts of copolymers of acrylic acid and maleic acid including for example, the alkali metal, ammonium and substituted ammonium salts. Soluble acrylate/maleate copolymers of this type are known materials and are described in European Patent Application No. 66915 published Dec.l, 1982.
  • the optional components generally represent less than about 200 ppm, preferably about 15 to about 100 ppm of the components introduced into the closed water treatment system and in the concentrate, from about 1 to about 40%, preferably 5 to 20% by weight of the other non aqueous components.
  • composition for the method of the invention comprises:
  • composition comprising water
  • the method of the invention is practiced by introducing into the water of a closed system such as the HVAC system of a building complex and maintaining therein an amount of the composition effective to inhibit corro ⁇ sion of metal in that water environment.
  • the materials are either mixed together and added to the water or are mixed together and added to a relatively small amount of water to form a concentrate which is then added to the water in the system.
  • the water used was tap water from Lake Ontario. All tests contained a buffering amount of the amine morpholine or sodium metaborate. These tests were all initially at a pH of about pH 9.4. The beakers were open to air and any liquid loss was made up with deionized water so that no additional salts were introduced. Metal test coupons were submerged and allowed to sit in this treated tap water in open beakers at room temperature for approximately one month at which time the submerged metal coupons were removed and the corrosion rate was determined and expressed as metal loss penetration in thousandths of inches (mils) per year (MPY) . ASTM procedure D2688-90 was followed in the preparation, processing and MPY determinations of the metal coupon test pieces.
  • All of the metal test pieces were of the same size and dimensions and of the same metallurgy. ASTM 1010 mild steel was used. The lower the MPY value achieved the more success ⁇ ful the corrosion inhibitor. Realizing a low corrosion rate is most desirable for the mild steel test piece because closed systems are primarily constructed using this grade of steel for the piping. The corrosion rate was also tested using aluminum and copper as corrosion of these metals is also an issue in closed systems. All of the monocarboxylic, dicarboxylic and tricarboxylic acid materials used were neutralized with the appropriate amount of sodium or potassium hydroxide to obtain a neutralized salt in solution. Morpholine or sodium metaborate was then added to obtain a pH of 9.4 which was the standard test pH and used for all the tests. Maintaining the same pH for all of the tests is important as it is well known that the pH of an aqueous solution significantly affects the corrosivity to metals especially in the case of mild steel.
  • Table 1 shows the results of static beaker corrosion tests which contained the recited level of ingredients and which included linear C 6 , C 8 , and do fatty acid, (caproic, caprylic and capric) and other inhibitors as indicated.
  • Table 1 also provides the corrosion values obtained with the known morpholine plus sodium molybdate based inhibitor treated water and of morpholine alone. 225 ppm morpholine was used in the test as this was the quantity required to obtain a pH of 9.4 in this test protocol. If the tap water was left at its normal pH of 7.5, the mild steel corrosion rate would be approximately 10 MPY over this time period, A corrosion rate of less than 1 MPY on the steel piece is most desirable.
  • Table 2 describes tests carried out with the water adjusted to pH 9.4 with sodium metaborate. This was done to establish if this practical buffering method had any significant effect on corrosion rates when using fatty acids.
  • the corrosion inhibition by the C 8 and C ⁇ 0 fatty acid mix is slightly inferior in the sodium metaborate pH adjusted solutions compared to the morpholine pH adjusted solutions.
  • Example 11 establishes that citric acid, a tricarboxylic acid, is an effective corrosion inhibitor for mild steel. It is to be noted that increased corro ⁇ sion inhibition could be realized by increasing the fatty acid salt concentration.
  • TABLE 3 shows the corrosion inhibiting proper ⁇ ties of various concentrations of various other monocarboxylic fatty acids using the same static condi ⁇ tions described in Table 1.
  • Table 3 demonstrates the efficacy of these various fatty acids. The fatty acid concentration in all of these tests was 345 parts per million.
  • Table 4 sets forth the corrosion rates obtained using various pure dicarboxylic acids, commercially available mixtures of dicarboxylic acids and mixtures of dicarboxylates and monocarboxylates. A comparative 345 ppm concentration of the mixed and pure dicarboxylic acid and of the mixtures of various mono dicarboxylic acids was used.
  • Tests 22 and 23 utilized 50 and 100 ppm tartaric acid concentrations respectively.
  • the salt of this dicarboxylic acid is also a very good static corrosion inhibitor especially at the higher 100 ppm concentration.
  • test exposure period for the metal test pieces was approximately three days.
  • Tables 5 and 6 set out the test results using various water treatments and concentrations of the mono- and dicarboxylic acids and mixtures of these acids using the hot water test rig described above.
  • Tests conducted utilizing the above described hot water test rig and using untreated Lake Ontario water yielded a mild steel corrosion rate of greater than 20 MPY on the standard test pieces . Treatment yielding less than one MPY on the steel piece are desirable.
  • the carboxylic acids are neutralized with the appropriate amount of sodium or potassium hydroxide to yield a neutral solution pH and then the appropriate amount of morpholine or metaborate is added to obtain a final solution pH of 9.4 at room temperature.
  • Test 24 shows the corrosion rate obtained on this test rig using a known, existing commercial closed system formulation.

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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)

Abstract

Cette invention concerne un procédé d'inhibition de la corrosion de métaux dans un système d'alimentation en eau clos, que l'on trouve dans des systèmes industriels, commerciaux ou publics, lequel procédé fait appel à une composition contenant au moins un sel d'acide gras soluble dans l'eau et correspondant à la formule R COOX et R1 (COOX)¿n?, où R est alkyle C6-18 ou hydroxyalkyle (6-18), R?1¿ est alkyle C¿2-18? ou hydroxyalkyle C2-18, X est un cation de formation de sel et n est égal à 2 ou 3. Ce ou ces sels inhibiteurs de corrosion sont présents en quantité variant entre 1 et 1000 mg/l du système de traitement aqueux. D'autres additifs aidant à réduire la corrosion des métaux, tel que des benzoates, des silicates, des nitrates, des molybdates, du triazole et autres éléments semblables, peuvent également être ajoutés.
PCT/US1996/006158 1995-06-05 1996-05-02 Procede d'inhibition de la corrosion de metaux dans des systemes d'alimentation en eau a grande echelle WO1996039549A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6458320B1 (en) * 1999-04-05 2002-10-01 Ashland Inc. Galvanized metal corrosion inhibitor
EP1340840A2 (fr) * 2002-03-01 2003-09-03 Organo Corporation Inhibiteurs de la corrosion organique et procédé d'inhibition de la corrosion pour des systèmes aqueux
EP1722010A1 (fr) * 2004-03-05 2006-11-15 Kitz Corporation Procede pour empecher le lessivage par nickelage partir d'un quipement en alliage de cu ivre au contact d'un liquide , agent formateur d'un film de protection pour la prevention du lessivage par nickelage et produit nettoyant pour la prevention
WO2008017739A1 (fr) * 2006-08-08 2008-02-14 Total Raffinage Marketing Compositions a base d'acides carboxyliques pour protection temporaire de surfaces metalliques et films secs obtenus a partir desdites compositions
US20140219994A1 (en) * 2011-06-29 2014-08-07 Zhendong Liu Molybdate-free sterilizing and pasteurizing solutions

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EP1340840A2 (fr) * 2002-03-01 2003-09-03 Organo Corporation Inhibiteurs de la corrosion organique et procédé d'inhibition de la corrosion pour des systèmes aqueux
EP1340840A3 (fr) * 2002-03-01 2004-08-25 Organo Corporation Inhibiteurs de la corrosion organique et procédé d'inhibition de la corrosion pour des systèmes aqueux
EP1722010A1 (fr) * 2004-03-05 2006-11-15 Kitz Corporation Procede pour empecher le lessivage par nickelage partir d'un quipement en alliage de cu ivre au contact d'un liquide , agent formateur d'un film de protection pour la prevention du lessivage par nickelage et produit nettoyant pour la prevention
EP1722010A4 (fr) * 2004-03-05 2010-02-24 Kitz Corp Procede pour empecher le lessivage par nickelage a partir d'un equipement en alliage de cuivre au contact d'un liquide , agent formateur d'un film de protection pour la prevention du lessivage par nickelage et produit nettoyant pour la prevention
US8182879B2 (en) 2004-03-05 2012-05-22 Kitz Corporation Method for preventing elution of nickel from water-contact instrument of copper alloy by formation of a protective film
WO2008017739A1 (fr) * 2006-08-08 2008-02-14 Total Raffinage Marketing Compositions a base d'acides carboxyliques pour protection temporaire de surfaces metalliques et films secs obtenus a partir desdites compositions
FR2904829A1 (fr) * 2006-08-08 2008-02-15 Total France Sa Compositions a base d'acides carboxyliques pour protection temporaire de surfaces metalliques et films secs obtenus a partir desdites compositions
US20140219994A1 (en) * 2011-06-29 2014-08-07 Zhendong Liu Molybdate-free sterilizing and pasteurizing solutions
US9873535B2 (en) * 2011-06-29 2018-01-23 Genral Electric Company Molybdate-free sterilizing and pasteurizing solutions

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