EP0482614B2 - Verfahren zur kontrollierten Passivierung der Innenwände eines Kühlkreislaufsystems aus Kohlenstoffstahl - Google Patents

Verfahren zur kontrollierten Passivierung der Innenwände eines Kühlkreislaufsystems aus Kohlenstoffstahl Download PDF

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Publication number
EP0482614B2
EP0482614B2 EP91118080A EP91118080A EP0482614B2 EP 0482614 B2 EP0482614 B2 EP 0482614B2 EP 91118080 A EP91118080 A EP 91118080A EP 91118080 A EP91118080 A EP 91118080A EP 0482614 B2 EP0482614 B2 EP 0482614B2
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EP
European Patent Office
Prior art keywords
passivation
coolant
corrosion
process according
oxygen
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Expired - Lifetime
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EP91118080A
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German (de)
English (en)
French (fr)
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EP0482614A1 (de
EP0482614B1 (de
Inventor
Enno Dr. c/o Nalco Europe Sàrl Buss
Donald A. C/O Nalco Chemical Company Johnson
Gerhard Dr. Bohnsack
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ChampionX LLC
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Nalco Chemical Co
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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
    • C23F15/00—Other methods of preventing corrosion or incrustation
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • C23C22/62—Treatment of iron or alloys based thereon
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8

Definitions

  • the invention relates to a simple and economical Controlled passivation process the inner walls of an open and / or closed cooling circuit system made of carbon steel with an oxygen-containing circulating in it as well as containing alkali and alkaline earth bicarbonate aqueous coolant as well as the application this method of electrochemical control and determination of the passivation state of the metallic surfaces of the coolant system, in contact with the aqueous coolant come, as well as to check the quality of the Coolant, especially water.
  • open air and / or closed cooling circuit system is an aqueous coolant, primarily To understand water containing cooling system whose metallic surfaces match those of the aqueous Coolant come into contact with corrosion subject to.
  • a cooling system can cooling circuit system open to air and / or a closed cooling circuit system be.
  • Corrosion a virtually ubiquitous problem, is known to be mostly from the surface outgoing of a metallic material and by chemical or electrochemical attacks in most cases this material flowing corrosive medium caused disadvantageous and quality-reducing change the material surface.
  • a corrosive medium come mainly electrolyte solutions (including Water), melts or gases.
  • Passive corrosion protection measures i.e. method for the formation of passive corrosion protection layers on steel substrates, e.g. from the U.S. Patent 3,817,795 already known.
  • the one described in it The procedure involves contacting the Steel substrate with an aqueous electrolyte solution, removing the steel substrate from the aqueous electrolyte solution and drying the same in an oxygen-containing gas atmosphere as well as repeating this several times Process until the periodically repeated measurement of the electrode potential of the steel substrate in the Contact with the aqueous electrolyte solution a stable calomel electrode Assumes value in the presence of water is higher than 0 mV.
  • the object of the invention was therefore the inner walls a cooling circuit system from (economical) Carbon steel with a circulating Oxygenated as well as alkali and alkaline earth bicarbonate containing aqueous coolant controlled to passivate.
  • the procedure is the pH of the coolant preferably to a value in the range of 8.5 to 9.5 set.
  • the setting of the oxygen content of the cooling liquid is preferably carried out by introducing air or oxygen or by adding H 2 O 2 .
  • An Ag / AgCl or an Hg / Hg 2 Cl 2 electrode is preferably used as the reference electrode.
  • the measurement of the electrochemical resting potential is preferably at a temperature in the Range from 5 to 95 ° C, especially in the range from 25 to 40 ° C.
  • the cooling liquid can preferably be another The usual corrosion inhibitor can be added.
  • oxygen concentration and carbonate concentration conditions in the coolant on top of each other can be any passivation state of the contact surfaces can be set.
  • An inadequate one Passivation is immediately recognizable by that the resting potential changes over time not or in electronegative or cathodic Direction changed (increased corrosion).
  • the state of passivation can be metallic contact surfaces in aqueous Cooling systems easily determine the corrosion inhibition effectively control and the quality of the Cooling water, especially water in general, check easily and quickly. It has been shown that the current state of passivation changes an aqueous cooling system and especially in a cooling water circulation system in very simple and can be determined reliably can if you have a measuring device in the system arranges with a measuring electrode and the Surface condition of this measuring electrode Measure their resting potential against a reference electrode certainly. It has been shown that a direct correlation between the corrosion rate and the resting potential, the almost ideal Passivation state a characteristic Corresponds to the value of the resting potential.
  • the attached drawing shows the dependency the corrosion rate (measured in 0.025 mm / day) as they change under different conditions alkalinity, oxygen and chloride concentration in an open air cooling water circulation system of the resting potential of the Measuring electrode (measured in mV).
  • the operator of a Cooling tower system enabled operation to control and control his unit that the chemical conditions with the aim of Creation of an optimal passivation layer can be set on the metallic surfaces can.
  • the determination is made here a current status by means of a display by a single parameter, the resting potential the measuring electrode. This will be a significant one Simplify the entire corrosion monitoring process possible.
  • the method according to the invention can also for the evaluation of corrosion inhibition methods be used with those on the metal surfaces effectively a passivation layer is trained.
  • the basic concept of corrosion inhibition is to keep the solubility of the corrosion products as low as possible. Since the primary corrosion products of iron in water systems, the iron hydroxide (Fe (OH) 2) or iron carbonate are (FeCO 3), an increase of the pH value leads to a reduction of the solubility of iron compounds.
  • the primary oxidizing agent ie the primary corrosion inhibitor
  • the primary corrosion inhibitor is dissolved oxygen, which because of its low solubility is normally also present in the dangerous inhibitor concentration.
  • the minimum concentration of the oxidizing agent for anodic corrosion inhibition by means of oxidation depends strongly on the kinetics of the oxidation reaction. The oxidation must take place very close to the metal surface in order to achieve a permanent and even covering of the metal surface. For this reason, the magnitude of the dangerous inhibitor concentration also depends on the amount of the corrosion product that has to be oxidized. In the case of oxygen saturation, this concentration for Fe (II) is less than 10 -7 mol / l.
  • the reaction products of the redox reactions are Fe (III) oxyhydrates, since Fe (II) under these conditions does not exist in the presence of oxygen.
  • the Fe (III) oxyhydrate forms a thin, but very effective passivation layer in which Phosphonates are included.
  • the passivation layer formed has the Electron conductivity properties of a semiconductor, which gives it cathodic activity. Because of its cathodic reaction on the passivation layers oxygen calls an increase of the metal potential caused by the iron solution reaction is answered. If the passivation layer however sufficiently impermeable for Is the iron dissolution is prevented and the reaction rate drops to negligible Values. Because these relationships are entirely are caused by preventing iron dissolution (anodic inhibition), the potential is increased, if the corrosion rates are reduced.
  • the rest potential of an iron electrode measured in the cooling water.
  • a measuring electrode is combined for the measurement made of carbon steel with a reference electrode, preferably an Ag / AgCl electrode, and measures the resting potential.
  • a reference electrode preferably an Ag / AgCl electrode
  • Another suitable reference electrode is the calomel electrode. If under these conditions a resting potential of more than -300 mV (e.g. more positive than -250 mV) is reached Dissolution on the iron electrode and the mild steel surfaces, who are in contact with the Cooling water are due to the corrosion process minimal. In contrast, a corrosive Iron electrode typically has a resting potential from around -500 mV.
  • Ratios are analogous to other metals transferable. Come as metallic materials especially carbon steel and other steel alloys into consideration.
  • the material of the measuring electrode of the composition the one at risk of corrosion Metallic material corresponds, is about the Measuring the resting potential an immediate and current information about the state of passivation preserve the metal surface.
  • the measuring arrangement with measuring electrode can also be arranged in multiple copies, so that the entire state of corrosion in an aqueous coolant system detectable is.
  • the pH of the water system will increase Values from 8.0 to 10.5 and preferably from 8.5 to 9.5 set. Under these alkalinity conditions passivation is greatest. So will the operator of a cooling water circuit the invention enables the state of corrosion to keep close to the ideal passivation or at Increase in the measured resting potential (i.e. appropriate measures for more negative values) to take.
  • the oxygen concentration in an open-air cooling water circulation system should be set to a value in the range of 1 to 50 mg / l, which in certain cases can also be achieved by adding oxygen (air or pure oxygen) or by adding H 2 O 2 can be reached.
  • the resting potential measurement is preferred at temperatures in the range of 5 ° C to 95 ° C and preferably carried out from 25 ° C to 40 ° C. Temperatures outside this range are, however, often due to the corresponding water-based cooling system specified in the operating state.
  • the inventive method is also suitable here Processes for controlled passivation and current determination of the passivation state.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP91118080A 1990-10-23 1991-10-23 Verfahren zur kontrollierten Passivierung der Innenwände eines Kühlkreislaufsystems aus Kohlenstoffstahl Expired - Lifetime EP0482614B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4033686 1990-10-23
DE4033686 1990-10-23

Publications (3)

Publication Number Publication Date
EP0482614A1 EP0482614A1 (de) 1992-04-29
EP0482614B1 EP0482614B1 (de) 1995-12-27
EP0482614B2 true EP0482614B2 (de) 1999-03-31

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ID=6416877

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Application Number Title Priority Date Filing Date
EP91118080A Expired - Lifetime EP0482614B2 (de) 1990-10-23 1991-10-23 Verfahren zur kontrollierten Passivierung der Innenwände eines Kühlkreislaufsystems aus Kohlenstoffstahl

Country Status (4)

Country Link
EP (1) EP0482614B2 (enrdf_load_stackoverflow)
AT (1) ATE132205T1 (enrdf_load_stackoverflow)
DE (2) DE59107150D1 (enrdf_load_stackoverflow)
ES (1) ES2082092T5 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017107529A1 (de) * 2017-04-07 2018-10-11 Lisa Dräxlmaier GmbH Verfahren zur Korrosionsinhibierung von Metallen und Temperierungssystem für ein metallisches Werkzeug

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH691479A5 (de) * 1996-12-06 2001-07-31 Siemens Ag Oberflächenbehandlung von Stahl.

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3483133A (en) * 1967-08-25 1969-12-09 Calgon C0Rp Method of inhibiting corrosion with aminomethylphosphonic acid compositions
US3817795A (en) * 1968-01-16 1974-06-18 Belge Etude De La Corrosion Ce Process for treating a metal or alloy by means of an electrolyte
US3891568A (en) * 1972-08-25 1975-06-24 Wright Chem Corp Method and composition for control of corrosion and scale formation in water systems
US3992318A (en) * 1973-10-09 1976-11-16 Drew Chemical Corporation Corrosion inhibitor
US3935125A (en) * 1974-06-25 1976-01-27 Chemed Corporation Method and composition for inhibiting corrosion in aqueous systems
US4209487A (en) * 1975-06-02 1980-06-24 Monsanto Company Method for corrosion inhibition
US4105581A (en) * 1977-02-18 1978-08-08 Drew Chemical Corporation Corrosion inhibitor
US4149969A (en) * 1977-03-23 1979-04-17 Amax Inc. Process and composition for inhibiting corrosion of metal parts in water systems
US4317744A (en) * 1979-04-25 1982-03-02 Drew Chemical Corporation Corrosion inhibitor
EP0049706B1 (en) * 1980-10-10 1987-04-01 Nippon Kinzoku Co., Ltd. Method and apparatus for continuously forming color display layer on stainless steel strip
DE3504925A1 (de) * 1985-02-13 1986-08-14 Kraftwerk Union AG, 4330 Mülheim Verfahren und einrichtung zum schutz von dampferzeugern, insbesondere von kernreaktoren
DE3635411A1 (de) * 1986-10-17 1988-04-21 Dietz Josef Sauerstoffanreicherung von trinkwasser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017107529A1 (de) * 2017-04-07 2018-10-11 Lisa Dräxlmaier GmbH Verfahren zur Korrosionsinhibierung von Metallen und Temperierungssystem für ein metallisches Werkzeug

Also Published As

Publication number Publication date
DE4135029C2 (enrdf_load_stackoverflow) 1993-05-13
ES2082092T5 (es) 1999-08-16
DE59107150D1 (de) 1996-02-08
ES2082092T3 (es) 1996-03-16
DE4135029A1 (de) 1992-04-30
ATE132205T1 (de) 1996-01-15
EP0482614A1 (de) 1992-04-29
EP0482614B1 (de) 1995-12-27

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