EP0574064A2 - Verfahren und Vorrichtung zur Regelung von Korrosionsschutzanlagen - Google Patents

Verfahren und Vorrichtung zur Regelung von Korrosionsschutzanlagen Download PDF

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Publication number
EP0574064A2
EP0574064A2 EP93201501A EP93201501A EP0574064A2 EP 0574064 A2 EP0574064 A2 EP 0574064A2 EP 93201501 A EP93201501 A EP 93201501A EP 93201501 A EP93201501 A EP 93201501A EP 0574064 A2 EP0574064 A2 EP 0574064A2
Authority
EP
European Patent Office
Prior art keywords
potential
sacrificial anodes
reference electrode
metal surface
oil tank
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP93201501A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0574064A3 (enrdf_load_stackoverflow
Inventor
Karl Lang
Johan S. Meijer
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.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
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
Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
Publication of EP0574064A2 publication Critical patent/EP0574064A2/de
Publication of EP0574064A3 publication Critical patent/EP0574064A3/xx
Withdrawn legal-status Critical Current

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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
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/04—Controlling or regulating desired parameters
    • 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
    • C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
    • C23F2213/20—Constructional parts or assemblies of the anodic or cathodic protection apparatus
    • C23F2213/21—Constructional parts or assemblies of the anodic or cathodic protection apparatus combining at least two types of anodic or cathodic protection

Definitions

  • the invention relates to a method and a device for regulating systems for the cathodic corrosion protection of metal surfaces, consisting of a plurality of sacrificial anodes which are electrically conductively connected to one another and at least one electroless reference electrode which are electrically insulated from the metal surface and immersed in the adjacent electrolyte.
  • cathodic corrosion protection with galvanic anodes is used in that the metal to be protected is conductively connected to a metal that is more negative in the electrochemical voltage series. In the galvanic element created in this way, an electrical direct current flows to the more negative metal, which acts as a cathode.
  • Zinc which has a potential of -1100 mV compared to a Cu / CuSO4 measuring cell, has proven particularly useful. It is therefore more negative than the steel with a potential of -600 mV and acts as an anode, polarizes the steel and thereby protects it from corrosion.
  • the potential is reduced by about -200 mV compared to the resting potential, the corrosion is stopped. Steel is protected when the potential is set to around -800 to -850 mV.
  • the zinc anodes are gradually consumed in the cathodic corrosion protection of steel.
  • the solution to this problem is that the potential between the metal surface and the reference electrode is continuously detected by measurement and, in the event of deviations from the desired value of the potential, external current is automatically supplied to the sacrificial anodes until the potential drop is adjusted to the desired potential (setpoint).
  • This method has the advantage that the condition of the cathodic corrosion protection system can be observed at all times and the removal of the sacrificial anodes is kept to a minimum. Otherwise, the material of the anode metal dissolves in uncontrolled operation in accordance with the natural potential difference between the anode and cathode and the resulting corrosion current.
  • the device for carrying out the method consists in that the reference electrode, the output of the sacrificial anodes and the metal surface are connected to a PI controller and the power output of the sacrificial anodes can be regulated.
  • the reference electrode is connected to a PI controller as the actual value.
  • the setpoint set on the PI controller controls a voltage source, which is connected to the sacrificial anodes, in comparison to the actual value.
  • zinc, magnesium, aluminum or iron-silicon alloys are used as sacrificial anodes.
  • a preferred embodiment of the method according to the invention is that instead of the external current supply, the current emitted by the sacrificial anodes is continuously and automatically limited until the potential reduction is brought into line with the desired potential (desired value).
  • the Darlington circuit in which two to three transistors are connected in cascade in such a way that the emitter current of the previous one is equal to the base current of the next transistor, has proven to be particularly suitable for carrying out this method. This significantly increases the current gain and thus the input resistance.
  • an electrically insulated cable (9, 10) is liquid-tight through the wall (11) of the crude oil tank (2) to one with a External power source (12) connected PI controller (13), which is electrically connected to the wall (11) of the crude oil tank (2) via the cable (14).
  • PI controller 13
  • the potential difference between the reference electrode (8) and the crude oil tank (2) is continuously measured regardless of the composition of the water layer (4) and the desired value is supplied by external power supply to the sacrificial anodes the potential difference of approx. -850 mV for steel was kept constant.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)
EP93201501A 1992-06-12 1993-05-26 Verfahren und Vorrichtung zur Regelung von Korrosionsschutzanlagen Withdrawn EP0574064A2 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4219202 1992-06-12
DE4219202 1992-06-12
DE4314924 1993-05-06
DE4314924A DE4314924A1 (de) 1992-06-12 1993-05-06 Verfahren und Vorrichtung zur Regelung von Korrosionsschutzanlagen

Publications (2)

Publication Number Publication Date
EP0574064A2 true EP0574064A2 (de) 1993-12-15
EP0574064A3 EP0574064A3 (enrdf_load_stackoverflow) 1994-02-16

Family

ID=25915601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93201501A Withdrawn EP0574064A2 (de) 1992-06-12 1993-05-26 Verfahren und Vorrichtung zur Regelung von Korrosionsschutzanlagen

Country Status (4)

Country Link
EP (1) EP0574064A2 (enrdf_load_stackoverflow)
DE (1) DE4314924A1 (enrdf_load_stackoverflow)
MX (1) MX9303487A (enrdf_load_stackoverflow)
NO (1) NO932156L (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2286196A (en) * 1994-01-27 1995-08-09 John Crome Latham Protecting vessels from corrosion using sacrificial anodes to carry impressed current
GB2481104A (en) * 2010-05-31 2011-12-14 Corrosion Service Company Ltd Apparatus and method for providing corrosion protection to a stainless steel process vessel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521246B2 (de) * 1965-12-30 1976-06-16 Bayer Ag, 5090 Leverkusen Verfahren und schaltung zum schutz von metallischen oberflaechen gegen chemische metallisierung
DE3716081A1 (de) * 1986-01-28 1988-11-24 Gunter Schuss Einrichtung zur fortlaufenden schaffung eines korrosionsschutzes in einem stahlblech-heizoellagerbehaelter
DE8709159U1 (de) * 1987-07-03 1987-08-13 Schuss, Gunter, 3560 Biedenkopf Bauteilesatz für eine Überwachungseinrichtung in einem Stahlblech-Heizöllagerbehälter mit einem kathodischen Korrosionsschutzsystem
US5065893A (en) * 1991-03-15 1991-11-19 Corrpro Companies Inc. Cathodic protection system and method for above-ground storage tank bottoms

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2286196A (en) * 1994-01-27 1995-08-09 John Crome Latham Protecting vessels from corrosion using sacrificial anodes to carry impressed current
GB2481104A (en) * 2010-05-31 2011-12-14 Corrosion Service Company Ltd Apparatus and method for providing corrosion protection to a stainless steel process vessel
US8608913B2 (en) 2010-05-31 2013-12-17 Corrosion Service Company Limited Method and apparatus for providing electrochemical corrosion protection
GB2481104B (en) * 2010-05-31 2014-04-23 Corrosion Service Company Ltd Method and apparatus for providing electrochemical corrosion protection

Also Published As

Publication number Publication date
NO932156L (no) 1993-12-13
EP0574064A3 (enrdf_load_stackoverflow) 1994-02-16
NO932156D0 (no) 1993-06-11
MX9303487A (es) 1994-07-29
DE4314924A1 (de) 1993-12-16

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