EP0600411B1 - Inhibiteur de corrosion pour métaux lourds non-ferraux qui est stable vis-à-vis des micro-organismes - Google Patents

Inhibiteur de corrosion pour métaux lourds non-ferraux qui est stable vis-à-vis des micro-organismes Download PDF

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Publication number
EP0600411B1
EP0600411B1 EP19930119207 EP93119207A EP0600411B1 EP 0600411 B1 EP0600411 B1 EP 0600411B1 EP 19930119207 EP19930119207 EP 19930119207 EP 93119207 A EP93119207 A EP 93119207A EP 0600411 B1 EP0600411 B1 EP 0600411B1
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EP
European Patent Office
Prior art keywords
weight
methylbenzotriazole
mbt
water
tolyltriazole
Prior art date
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Revoked
Application number
EP19930119207
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German (de)
English (en)
Other versions
EP0600411A1 (fr
Inventor
Narashima M. Rao
Frank Y. Lu
Donald A. Johnson
Nhuan P. Nghiem
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.)
ChampionX LLC
Original Assignee
Nalco Chemical Co
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
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Application filed by Nalco Chemical Co filed Critical Nalco Chemical Co
Publication of EP0600411A1 publication Critical patent/EP0600411A1/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
    • C23F11/14—Nitrogen-containing compounds
    • C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom

Definitions

  • the present invention is directed to a microbiologically stable corrosion inhibitor and a method of preventing yellow metal corrosion in aqueous systems.
  • the composition and method provide superior corrosion performance. More particularly, the invention provides a composition including 4-methylbenzotriazole (4-MBT) which is used as a yellow metal corrosion inhibitor in aqueous systems.
  • Tolyltriazole has two isomers, 4-methylbenzotriazole (4-MBT) and 5-methylbenzotriazole (5-MBT).
  • Tolyltriazole as the mixture of the two isomers, has traditionally been one of the most effective corrosion inhibitors for copper and its alloys in a wide variety of cooling water environments.
  • a commercially available preparation of the mixed tolyltriazole isomers is COBRATEC® TT-100, available from PMC Specialties, Cincinnati, Ohio.
  • Mixed tolyltriazole isomer preparations used as corrosion inhibitors include at least 60% by weight of the 5-MBT isomer. Generally, the tolyltriazole isomers are added to cooling water to inhibit corrosion.
  • the present invention advantageously provides a tolyltriazole composition which is not biodegradable and, therefore, will provide a corrosion inhibitor which is easier to dose, more economical and not wasted in systems which have microbiological contamination.
  • the novel composition and method of the present invention significantly and unexpectedly provide excellent corrosion inhibition while being microbiologically stable.
  • One aspect of the invention provides a method of preventing the corrosion of the yellow metal surfaces of a cooling system in contact with water.
  • the method comprises the step of adding to the water a tolyltriazole composition including at least 45 % by weight 4-methylbenzotriazole.
  • the 4-methylbenzotriazole is added to the water in a final concentration of from about 0,01 to about 100 parts per million.
  • 4-MBT is biostable
  • 4-MBT is preferably added intermittently to achieve a concentration of 4-MBT in the water from 0.05 to about 20 ppm.
  • the cooling water may also contain non-tolyltriazole corrosion inhibitors, such as biocides, phosphates, benzotriazole, napthatriazole, molybdates, and polymer treatment programs. These other non-tolyltriazole corrosion inhibitors may be added with the 4-MBT or separately.

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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)

Claims (18)

  1. Procédé pour inhiber la corrosion des surfaces en métal jaune en contact avec de l'eau d'un système de refroidissement, procédé qui comprend l'étape d'ajouter à l'eau une composition d'un mélange d'isomères de tolyltriazole, composition qui contient au moins 45% en poids de 4-méthylbenzotriazole Cet moins que 55% en poids de 5-méthylbenzotriazole].
  2. Procédé selon la revendication 1, dans lequel la composition de tolyltriazole est ajoutée à l'eau dans une concentration finale de 0,01 à environ 100 ppm de 4-méthylbenzotriazole.
  3. Procédé selon la revendication 1 ou 2, dans lequel la composition de tolyltriazole est ajoutée à l'eau de façon intermittente.
  4. Procédé selon la revendication 1 ou 2, dans lequel la composition de tolyltriazole est ajoutée à l'eau de façon continue.
  5. Procédé selon l'une des revendications 1 à 4, dans lequel la composition de tolyltriazole est ajoutée à l'eau dans une concentration finale d'environ 0,1 à environ 20 ppm de 4-méthylbenzotriazole.
  6. Procédé selon l'une des revendications 1 à 5, qui comprend l'étape supplémentaire d'addition à l'eau d'un inhibiteur de corrosion non-tolyltriazole.
  7. Procédé pour inhiber la corrosion des surfaces en métal jaune d'une tour de refroidissement à l'eau en contact avec de l'eau comprenant des micro-organismes, procédé qui comprend l'étape d'ajouter à l'eau une composition d'un mélange d'isomères de tolyltriazole contenant au moins 60% en poids de 4-méthylbenzotriazole [et moins que 40% en poids de 5-méthylbenzotriazole].
  8. Procédé selon la revendication 7, dans lequel la composition du mélange d'isomères de tolyltriazole contient au moins 80% en poids de 4-méthylbenzotriazole [et moins que 20% en poids de 5-méthylbenzotriazole].
  9. Procédé selon la revendication 7 ou 8, dans lequel la composition du mélange d'isomères de tolyltriazole contient au moins 90% en poids de 4-méthylbenzotriazole [et moins que 10% en poids de 5-méthylbenzotriazole].
  10. Procédé selon l'une des revendications 7 à 9, dans lequel la composition du mélange d'isomères de tolyltriazole contient au moins 95% en poids de 4-méthylbenzotriazole [et moins que 5% en poids de 5-méthylbenzotriazole].
  11. Procédé selon la revendication 10, qui comprend l'étape supplémentaire d'ajouter à l'eau un inhibiteur de corrosion non-tolyltriazole.
  12. Procédé selon l'une des revendications 7 à 11, dans lequel la composition du mélange d'isomères de tolyltriazole est ajoutée à l'eau dans une concentration finale de 0,01 à environ 100 ppm de 4-méthylbenzotriazole.
  13. Inhibiteur de corrosion micro-biologiquement stable, qui comprend une composition de tolyltriazole contenant au moins 45% en poids de 4-méthylbenzotriazole, éventuellement en mélange avec un inhibiteur de corrosion non-tolyltriazole.
  14. Inhibiteur de corrosion selon la revendication 13, dans lequel la composition de tolyltriazole contient au moins 45% en poids de méthylbenzotriazole et moins que 55% en poids de 5-méthylbenzotriazole.
  15. Inhibiteur de corrosion selon la revendication 13 ou 14, dans lequel la composition de tolyltriazole contient au moins 60% en poids, de préférence au moins 80% en poids de 4-méthylbenzotriazole et moins que 40% en poids, de préférence moins que 20% en poids de 5-méthylbenzotriazole.
  16. Inhibiteur de corrosion selon l'une des revendications 13 à 15, dans lequel la composition de tolyltriazole contient au moins 90% en poids, de préférence au moins 95% en poids de 4-méthylbenzotriazole et moins que 10% en poids, de préférence moins que 5% en poids de 5-méthylbenzotriazole.
  17. Utilisation de l'inhibiteur de corrosion selon l'une des revendications 13 à 16 pour l'inhibition de la corrosion de surfaces d'un système de refroidissement en contact avec de l'eau, en particulier avec de l'eau chargée de micro-organismes.
  18. Utilisation de l'inhibiteur de corrosion selon la revendication 17 pour l'inhibition de la corrosion des surfaces en métal jaune en contact avec de l'eau d'un système de refroidissement, en particulier avec de l'eau chargée de micro-organismes.
EP19930119207 1992-11-30 1993-11-29 Inhibiteur de corrosion pour métaux lourds non-ferraux qui est stable vis-à-vis des micro-organismes Revoked EP0600411B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US98300392A 1992-11-30 1992-11-30
US983003 1992-11-30

Publications (2)

Publication Number Publication Date
EP0600411A1 EP0600411A1 (fr) 1994-06-08
EP0600411B1 true EP0600411B1 (fr) 1997-01-29

Family

ID=25529735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930119207 Revoked EP0600411B1 (fr) 1992-11-30 1993-11-29 Inhibiteur de corrosion pour métaux lourds non-ferraux qui est stable vis-à-vis des micro-organismes

Country Status (5)

Country Link
EP (1) EP0600411B1 (fr)
JP (1) JPH06212460A (fr)
BR (1) BR9304871A (fr)
DE (1) DE69307846T2 (fr)
ES (1) ES2101201T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63180562A (ja) * 1987-01-22 1988-07-25 Aisin Seiki Co Ltd 電動式パワ−ステアリングの誤動作防止装置
GB9417215D0 (en) 1994-08-25 1994-10-12 Amp Great Britain Electrical harness having an ectrical connector with an electrical component therin and a method of making
JP3224704B2 (ja) * 1994-12-05 2001-11-05 三井金属鉱業株式会社 有機防錆処理銅箔
ES2143722T3 (es) * 1995-11-09 2000-05-16 Nalco Chemical Co Control del nivel de actividad microbiologica de un sistema de fluido.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1347008A (en) * 1970-11-13 1974-02-13 Ciba Geigy Uk Ltd Detergent compositions
US3803049A (en) * 1971-06-14 1974-04-09 Sherwin Williams Co Benzotriazole and tolyltriazole mixtures
US4657785A (en) * 1985-12-11 1987-04-14 Nalco Chemical Company Use of benzo and tolyltriazole as copper corrosion inhibitors for boiler condensate systems

Also Published As

Publication number Publication date
BR9304871A (pt) 1994-06-21
EP0600411A1 (fr) 1994-06-08
DE69307846D1 (de) 1997-03-13
JPH06212460A (ja) 1994-08-02
DE69307846T2 (de) 1997-08-28
ES2101201T3 (es) 1997-07-01

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