EP0598429B1 - Installation de protection contre la corrosion - Google Patents

Installation de protection contre la corrosion Download PDF

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Publication number
EP0598429B1
EP0598429B1 EP93203069A EP93203069A EP0598429B1 EP 0598429 B1 EP0598429 B1 EP 0598429B1 EP 93203069 A EP93203069 A EP 93203069A EP 93203069 A EP93203069 A EP 93203069A EP 0598429 B1 EP0598429 B1 EP 0598429B1
Authority
EP
European Patent Office
Prior art keywords
corrosion
anode
components
cathode
corrosion protection
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.)
Expired - Lifetime
Application number
EP93203069A
Other languages
German (de)
English (en)
Other versions
EP0598429A1 (fr
Inventor
Ralf Dr. Feser
Manfred Dr. Pötzschke
Holger Müller
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 EP0598429A1 publication Critical patent/EP0598429A1/fr
Application granted granted Critical
Publication of EP0598429B1 publication Critical patent/EP0598429B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus

Definitions

  • the invention relates to a corrosion protection system for surfaces of metallic components or entire systems that collide with gaps to form ion-conducting liquid corrosion media, consisting of anodes arranged in the gaps in an electrically insulated manner from the metal surfaces.
  • the gap is sealed or designed so large that no concentration differences can arise in the corrosion medium as a result of flow through or exchange, or weld seams generated without remaining root gap.
  • the electrical direct current flowing in the corrosion element mainly causes the metallic material to dissolve in the anodic areas.
  • DE-A-25 20 376 describes a cathode protection system for the inner surface of a metallic pipeline provided with an electrically insulating inner coating.
  • an inner, electrically insulating piece of pipe is provided between the joints of adjacent pipe sections.
  • Insoluble anodes, which are electrically insulating from the pipe sections, are arranged between the connecting sleeves of the pipe sections and are connected in an electrically conductive manner to metallic cathodes which are laid in the ground area outside the pipe sections.
  • This cathode protection system is intended to provide corrosion protection on the joints of the pipe sections free of the insulating inner lining.
  • the object of the present invention is to design the corrosion protection system of the type described at the outset in such a way that crevice corrosion does not occur on the colliding surfaces of metallic components.
  • the solution to this problem consists in the fact that the anode, which is electrically connected to the components, is embedded in a body which has an open porosity and has an electrically insulating effect.
  • the anode is electrically insulated from the metallic surfaces of the components to be protected, but penetration of the ion-conducting liquid corrosion medium into the porous solid and thus the flow of a direct electrical current from the anode to the metallic surfaces to be protected, which act as the cathode Components enabled.
  • the corrosion is, among other things, dependent on the individual metal normal potentials specified in the electrochemical voltage series and the conductivity of the ion-conducting liquid corrosion medium.
  • the protective current In order to protect the metal surface of the components from crevice corrosion, it is necessary to impart a more negative potential than the free corrosion potential in the gap to the metal of the components, as a result of which the components are polarized and protected from crevice corrosion. In order to install a cathodic corrosion protection, the protective current must correspond approximately to the corrosion current with the opposite sign.
  • the direct current flowing from the anode to the cathodically made component must be so large that the potential of the metal surface to be protected must at least reach the protective potentials specified in DIN 30 676, the potential measurement in the gap being difficult.
  • cathodic corrosion protection system is the use of sacrificial anodes made of reactive metals, such as zinc, aluminum or magnesium alloys, the potential of which is more negative than that of the metal surfaces to be protected, so that the latter are polarized and protected against corrosion.
  • Fig. 1 shows in a longitudinal section the schematic representation of a cathodic corrosion protection system for the colliding surfaces of the flanges (1, 2) of steel pipes (3, 4).
  • annular anode (6) embedded in a porous solid, formed by a mineral fiber seal (5), which is connected via lines (7, 8) to the steel tubes (3 , 4) is connected in an electrically conductive manner.
  • the lines (7, 8) are connected to a controllable external power source (9).
  • Fig. 2 shows a longitudinal section in a schematic representation of the end sections of two steel tubes (10, 11), between their opposite flanges (12, 13) an annular anode (14) made of zinc and arranged in a solid body (15) made of porous material is embedded.
  • the anode (14) is connected in an electrically conductive manner to the steel tubes (10, 11) made as cathode via lines (16, 17).

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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)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Road Signs Or Road Markings (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)

Claims (5)

  1. Installation de protection de surfaces, aboutées avec formation d'interstices, de pièces métalliques ou de systèmes entiers vis-à-vis de milieux corrosifs liquides conduisant les ions, constituée d'anodes disposées dans les interstices de manière électriquement isolée des surfaces métalliques, caractérisée en ce que l'anode (6, 14) reliée aux pièces (3, 4, 10, 11) montées en cathode est incorporée dans un corps (5, 15) solide ayant une porosité ouverte et à action d'isolant électrique.
  2. Installation cathodique de protection vis-à-vis de la corrosion suivant la revendication 1, caractérisée en ce que l'anode (6) est reliée à une source (9) de courant extérieur.
  3. Protection cathodique vis-à-vis de la corrosion suivant la revendication 2, caractérisée en ce que l'anode (6) est en un métal résistant à la corrosion, notamment en alliages à base de titane ou de nickel.
  4. Protection cathodique vis-à-vis de la corrosion suivant la revendication 1, caractérisée en ce que l'anode (14) est notamment en alliages de zinc, d'aluminium ou de magnésium.
  5. Installation de protection cathodique vis-à-vis de la corrosion suivant l'une des revendications 1 à 3, caractérisée en ce que le potentiel des pièces (3, 4, 10, 11) montées en cathode est maintenu constant par rapport à une électrode de référence au moyen d'un redresseur réglé en potentiel.
EP93203069A 1992-11-17 1993-11-02 Installation de protection contre la corrosion Expired - Lifetime EP0598429B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4238751 1992-11-17
DE4238751A DE4238751A1 (de) 1992-11-17 1992-11-17 Korrosionsschutzanlage

Publications (2)

Publication Number Publication Date
EP0598429A1 EP0598429A1 (fr) 1994-05-25
EP0598429B1 true EP0598429B1 (fr) 1997-01-08

Family

ID=6473086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93203069A Expired - Lifetime EP0598429B1 (fr) 1992-11-17 1993-11-02 Installation de protection contre la corrosion

Country Status (6)

Country Link
EP (1) EP0598429B1 (fr)
AT (1) ATE147445T1 (fr)
DE (2) DE4238751A1 (fr)
DK (1) DK0598429T3 (fr)
ES (1) ES2096850T3 (fr)
GR (1) GR3022439T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006037706A1 (de) * 2006-08-11 2008-02-14 Pci Augsburg Gmbh Verfahren zum kathodischen Korrosionsschutz der Bewehrungen von Stahlbetonwerken
DE102013212725A1 (de) * 2013-06-28 2014-12-31 Ksb Aktiengesellschaft Fluidführendes System mit kathodischem Korrosionsschutz
CN114562619B (zh) * 2022-03-25 2023-05-19 安徽萍聚德医疗科技股份有限公司 一种无菌水制备用的管道系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1286480A (en) * 1968-12-21 1972-08-23 Luigi Bagnulo Prefabricated electrically insulating joint for metallic pipe lines
JPS60114582A (ja) * 1983-11-24 1985-06-21 Mitsubishi Heavy Ind Ltd 異材接合部の腐食防止方法
US4855029A (en) * 1987-09-11 1989-08-08 Titeflex Corporation Integral cathodic protection device
SU1546513A1 (ru) * 1988-02-01 1990-02-28 Институт Физической Химии Ан Ссср Сплав дл анода катодной защиты
EP0443229A1 (fr) * 1990-02-20 1991-08-28 Ebonex Technologies, Inc. Composition électroconductrice et son application
US5065893A (en) * 1991-03-15 1991-11-19 Corrpro Companies Inc. Cathodic protection system and method for above-ground storage tank bottoms

Also Published As

Publication number Publication date
GR3022439T3 (en) 1997-04-30
ATE147445T1 (de) 1997-01-15
DE4238751A1 (de) 1994-05-19
DK0598429T3 (da) 1997-01-27
DE59305062D1 (de) 1997-02-20
EP0598429A1 (fr) 1994-05-25
ES2096850T3 (es) 1997-03-16

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