EP0598429A1 - Installation de protection contre la corrosion - Google Patents

Installation de protection contre la corrosion Download PDF

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Publication number
EP0598429A1
EP0598429A1 EP93203069A EP93203069A EP0598429A1 EP 0598429 A1 EP0598429 A1 EP 0598429A1 EP 93203069 A EP93203069 A EP 93203069A EP 93203069 A EP93203069 A EP 93203069A EP 0598429 A1 EP0598429 A1 EP 0598429A1
Authority
EP
European Patent Office
Prior art keywords
corrosion protection
corrosion
anodes
components
protection system
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.)
Granted
Application number
EP93203069A
Other languages
German (de)
English (en)
Other versions
EP0598429B1 (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.
  • Corrosion processes are based on phase interface reactions between the metal surface and in particular ion-conducting liquid corrosion media. These trigger a variety of damage mechanisms through electrochemical processes, which can lead to both uniform and non-uniform material removal and selective changes in properties of the metallic material; in particular, this leads to the formation of local elements. So-called crevice corrosion is one of the most important types of electrochemical damage. This is due to the formation of corrosion elements, which are caused by differences in concentration in the corrosion medium and cause considerable problems in practice. Crevice corrosion is particularly dangerous because it causes very high rates of corrosion that lead to breakthroughs in the metal.
  • the gap is sealed or designed so large that no concentration differences can arise in the corrosion medium as a result of flow 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. Corrosion depends, among other things, on the individual normal metal potentials specified in the electrochemical 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.
  • anodes made of corrosion-resistant materials, such as titanium or nickel-based alloys, which is controlled by a control device. It is important that the anodes make good electrical contact with the component to be protected, in order to ensure that the required protective current is fully incorporated into the metal surface.
  • 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.
  • the freely selectable potential of the component acting as a cathode is kept constant by means of a potential-controlled current source, preferably a rectifier, via a commercially available reference electrode, for example known as a calomel or silver / silver chloride electrode.
  • 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)
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 true EP0598429A1 (fr) 1994-05-25
EP0598429B1 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10731786B2 (en) * 2013-06-28 2020-08-04 Ksb Aktiengesellschaft Fluid-conducting system with cathodic corrosion protection
CN114562619A (zh) * 2022-03-25 2022-05-31 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

Families Citing this family (1)

* 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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH496200A (de) * 1968-12-21 1970-09-15 Bagnulo Luigi Elektrisch isolierende Verbindung von zwei Rohrenden einer metallischen Rohrleitung
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
EP0503678A1 (fr) * 1991-03-15 1992-09-16 Materials Protection Company Procédé et dispositif de protection cathodique des fonds de réservoirs reposant sur terre

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH496200A (de) * 1968-12-21 1970-09-15 Bagnulo Luigi Elektrisch isolierende Verbindung von zwei Rohrenden einer metallischen Rohrleitung
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
EP0503678A1 (fr) * 1991-03-15 1992-09-16 Materials Protection Company Procédé et dispositif de protection cathodique des fonds de réservoirs reposant sur terre

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8531, 21 June 1985 Derwent World Patents Index; Class M14, AN 85-186784, MITSUBISHI HEAVY IND. K.K. *
DATABASE WPI Section Ch Week 9104, Derwent World Patents Index; Class M14, AN 91-028184, AS PHYSICAL CHEM. IND. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10731786B2 (en) * 2013-06-28 2020-08-04 Ksb Aktiengesellschaft Fluid-conducting system with cathodic corrosion protection
CN114562619A (zh) * 2022-03-25 2022-05-31 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
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

Also Published As

Publication number Publication date
DK0598429T3 (da) 1997-01-27
ES2096850T3 (es) 1997-03-16
EP0598429B1 (fr) 1997-01-08
DE4238751A1 (de) 1994-05-19
GR3022439T3 (en) 1997-04-30
ATE147445T1 (de) 1997-01-15
DE59305062D1 (de) 1997-02-20

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