EP0598429A1 - Corrosion protection installation - Google Patents
Corrosion protection installation Download PDFInfo
- 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
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- 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
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Classifications
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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
- 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
Abstract
Description
Die Erfindung betrifft eine Korrosionsschutzanlage für unter Bildung von Spalten zusammenstoßenden Oberflächen metallischer Bauteile oder ganzer Systeme gegenüber ionenleitenden flüssigen Korrosionsmedien, bestehend aus in den Spalten gegenüber den Metalloberflächen elektrisch isoliert angeordneten Anoden.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.
Korrosionsvorgänge beruhen auf Phasengrenzflächenreaktionen zwischen Metalloberfläche und insbesondere ionenleitenden flüssigen Korrosionsmedien. Diese lösen vielfältige Schädigungsmechanismen durch elektrochemische Vorgänge aus, die sowohl zu gleichmäßigem als auch ungleichmäßigem Werkstoffabtrag und selektiven Eigenschaftsveränderungen des metallischen Werkstoffs führen können; insbesondere kommt es hierdurch zur Ausbildung von Lokalelementen. Zu den wichtigsten Arten elektrochemischer Schäden zählt die sogenannte Spaltkorrosion. Diese ist auf die Bildung von Korrosionselementen zurückzuführen, die durch Konzentrationsunterschiede im Korrosionsmedium verursacht sind und beträchtliche Probleme in der Praxis auslösen. Die Spaltkorrosion ist besonders gefährlich, weil sie sehr hohe Korrosionsgeschwindigkeiten, die zu Durchbrüchen im Metall führen, verursacht. Um Spaltkorrosion zu vermeiden, werden glatte spaltlose Oberflächen auch an Übergangsstellen hergestellt, der Spalt abgedichtet oder so groß ausgelegt, daß infolge Durchströmen oder Austausch keine Konzentrationsunterschiede im Korrosionsmedium entstehen können, oder schweißnähte ohne verbleibenden Wurzelspalt erzeugt. Der im Korrosionselement fließende elektrische Gleichstrom bewirkt überwiegend an den anodischen Bezirken eine Auflösung des metallischen Werkstoffs.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. In order to avoid crevice corrosion, smooth, gapless surfaces are also produced at transition points, 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.
In der DE-A-25 20 376 ist ein Kathodenschutzsystem für die mit einem elektrisch isolierenden Innenbelag versehene Innenoberfläche einer metallischen Rohrleitung beschrieben. Dabei ist zwischen den Stößen aneinandergrenzender Rohrabschnitte jeweils ein inneres, elektrisch isolierendes Rohrstück vorgesehen. Zwischen den Verbindungsmuffen der Rohrabschnitte sind unlösliche, gegenüber den Rohrabschnitten elektrisch isolierende Anoden angeordnet und mit metallischen, im Erdbereich außerhalb der Rohrabschnitte verlegten Kathoden elektrisch leitend verbunden. Mit diesem Kathodenschutzsystem soll ein Korrosionsschutz an den vom isolierenden Innenbelag freien Stößen der Rohrabschnitte erzielt werden.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. In this case, 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.
Aus der JP-A-60 114 582 ist eine Kathodenschutzanlage für mechanisch miteinander verbundene metallische Bauteile, beispielsweise Rohre, bekannt. Dabei wird eine Dichtung aus Aluminium zwischen den Flanschen eines Rohres aus Kohlenstoffstahl und eines Rohres aus rostfreiem Stahl angeordnet, um als Opferanode zu dienen und deren Korrosion zu unterbinden.From JP-A-60 114 582 a cathode protection system for mechanically connected metallic components, for example pipes, is known. An aluminum seal is placed between the flanges of a carbon steel tube and a stainless steel tube to serve as a sacrificial anode and prevent corrosion.
Aufgabe der vorliegenden Erfindung ist es, die Korrosionsschutzanlage der eingangs beschriebenen Art so auszugestalten, daß das Auftreten von Spaltkorrosion an zusammenstoßenden Oberflächen metallischer Bauteile unterbleibt.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.
Die Lösung dieser Aufgabe besteht darin, daß die elektrisch leitend mit den Bauteilen verbundene Anode in einen eine offene Porosität aufweisenden, elektrisch isolierend wirkenden Körper eingebettet ist. Durch diese Maßnahme ist zwar die Anode von den zu schützenden metallischen Oberflächen der Bauteile elektrisch isoliert, jedoch wird ein Eindringen des ionenleitenden flüssigen Korrosionsmedium in den porösen Festkörper und damit das Fließen eines elektrischen Gleichstroms von der Anode zu den zu schützenden metallischen Oberflächen der als Kathode wirkenden Bauteile ermöglicht. Die Korrosion ist neben einigen anderen Faktoren abhängig von den in der elektrochemischen Spannungsreihe angegebenen einzelnen Metall-Normalpotentialen und der Leitfähigkeit des ionenleitenden flüssigen Korrosionsmediums. Um die Metalloberfläche der Bauteile vor Spaltkorrosion zu schützen, ist es erforderlich, ein negativeres Potential als das freie Korrosionspotential im Spalt dem Metall der Bauteile aufzuprägen, wodurch die Bauteile polarisiert und vor Spaltkorrosion geschützt sind. Um einen kathodischen Korrosionsschutz zu installieren, muß der Schutzstrom etwa dem Korrosionsstrom mit umgekehrtem Vorzeichen entsprechen.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. By this measure, 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. 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.
Als Richtlinie gilt, daß der von der Anode zum kathodisch gemachten Bauteil fließende Gleichstrom so groß sein muß, daß das Potential der zu schützenden Metalloberfläche die in DIN 30 676 vorgegebenen Schutzpotentiale mindestens erreichen muß, wobei sich die Potentialmessung im Spalt schwierig gestaltet.As a guideline, 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.
Um einen Gleichstrom konstanter Stromstärke zu erzeugen, ist es nach einem weiteren Erfindungsmerkmal angebracht, die aus korrosionsbeständigen Werkstoffen, wie Titan- oder Nickelbasislegierungen, bestehenden Anoden mit einem konstanten Strom zu beaufschlagen, der durch ein Kontrollgerät gesteuert wird. Wichtig ist, daß die Anoden mit dem zu schützenden Bauteil einen guten elektrischen Kontakt bilden, um zu gewährleisten, daß der benötigte Schutzstrom voll in die Metalloberfläche eingeht.In order to generate a direct current of constant current strength, it is appropriate according to a further feature of the invention to apply a constant current to the 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.
Eine weitere Ausgestaltung der kathodischen Korrosionsschutzanlage besteht in der Verwendung von Opferanoden aus reaktiven Metallen, wie Zink-, Aluminium- oder Magnesiumlegierungen, deren Potential negativer als das der zu schützenden Metalloberflächen ist, so daß letztere polarisiert und vor Korrosion geschützt sind.Another embodiment of the 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.
Nach einer besonderen Ausführungsform der erfindungsgemäßen kathodischen Korrosionsschutzanlage wird das frei wählbare Potential des als Kathode wirkenden Bauteils mittels potentialgeregelter Stromquelle, vorzugsweise einem Gleichrichter, über eine handelsübliche Bezugselektrode, beispielsweise bekannt als Kalomel- oder Silber/Silberchlorid-Elektrode, konstant gehalten.According to a special embodiment of the cathodic corrosion protection system according to the invention, 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.
Die Erfindung ist in den Zeichnungen beispielhaft erläutert.The invention is exemplified in the drawings.
Fig. 1 zeigt in einem Längsschnitt die schematische Darstellung einer kathodischen Korrosionsschutzanlage für die zusammenstoßenden Oberflächen der Flansche (1, 2) von Stahlrohren (3, 4). Dabei ist zwischen den Flanschen (1, 2) eine in einen porösen Festkörper, gebildet durch eine Mineralfaser-Dichtung (5), eingebettete kreisringförmige Anode (6) angeordnet, die über Leitungen (7, 8) mit den als Kathode geschalteten Stahlrohren (3, 4) elektrisch leitend verbunden ist. Die Leitungen (7, 8) sind mit einer regelbaren Fremdstromquelle (9) verbunden.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). Between the flanges (1, 2) there is an 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 zeigt in einem Längsschnitt in schematischer Darstellung die Endabschnitte von zwei Stahlrohren (10, 11), zwischen deren gegenüberliegenden Flanschen (12, 13) eine kreisringförmige Anode (14) aus Zink angeordnet und in einem aus porösem Werkstoff bestehenden Festkörper (15) eingebettet ist. Die Anode (14) ist über Leitungen (16, 17) elektrisch leitend mit den als Kathode gemachten Stahlrohren (10, 11) verbunden.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).
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4238751A DE4238751A1 (en) | 1992-11-17 | 1992-11-17 | Corrosion protection system |
| DE4238751 | 1992-11-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0598429A1 true EP0598429A1 (en) | 1994-05-25 |
| EP0598429B1 EP0598429B1 (en) | 1997-01-08 |
Family
ID=6473086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93203069A Expired - Lifetime EP0598429B1 (en) | 1992-11-17 | 1993-11-02 | Corrosion protection installation |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0598429B1 (en) |
| AT (1) | ATE147445T1 (en) |
| DE (2) | DE4238751A1 (en) |
| DK (1) | DK0598429T3 (en) |
| ES (1) | ES2096850T3 (en) |
| GR (1) | GR3022439T3 (en) |
Cited By (2)
| 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 (en) * | 2022-03-25 | 2022-05-31 | 安徽萍聚德医疗科技股份有限公司 | Pipeline system for sterile water preparation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006037706A1 (en) * | 2006-08-11 | 2008-02-14 | Pci Augsburg Gmbh | Cathodic corrosion protection of reinforcements of steel concrete plants, comprises generating perpendicular hollow spaces on upper surface of the concrete, and bringing KKS-anodes into the hollow spaces after the hardening of concrete |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH496200A (en) * | 1968-12-21 | 1970-09-15 | Bagnulo Luigi | Electrically insulating connection of two pipe ends of a metallic pipeline |
| JPS60114582A (en) * | 1983-11-24 | 1985-06-21 | Mitsubishi Heavy Ind Ltd | Prevention of corrosion in joint part of different materials |
| US4855029A (en) * | 1987-09-11 | 1989-08-08 | Titeflex Corporation | Integral cathodic protection device |
| SU1546513A1 (en) * | 1988-02-01 | 1990-02-28 | Институт Физической Химии Ан Ссср | Alloy for cathode protection anode |
| EP0443229A1 (en) * | 1990-02-20 | 1991-08-28 | Ebonex Technologies, Inc. | Electrically conductive composition and use thereof |
| EP0503678A1 (en) * | 1991-03-15 | 1992-09-16 | Materials Protection Company | Cathodic protection system and method for above-ground storage tank bottoms |
-
1992
- 1992-11-17 DE DE4238751A patent/DE4238751A1/en not_active Withdrawn
-
1993
- 1993-11-02 ES ES93203069T patent/ES2096850T3/en not_active Expired - Lifetime
- 1993-11-02 DK DK93203069.5T patent/DK0598429T3/en active
- 1993-11-02 DE DE59305062T patent/DE59305062D1/en not_active Expired - Fee Related
- 1993-11-02 AT AT93203069T patent/ATE147445T1/en not_active IP Right Cessation
- 1993-11-02 EP EP93203069A patent/EP0598429B1/en not_active Expired - Lifetime
-
1997
- 1997-01-30 GR GR970400153T patent/GR3022439T3/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH496200A (en) * | 1968-12-21 | 1970-09-15 | Bagnulo Luigi | Electrically insulating connection of two pipe ends of a metallic pipeline |
| JPS60114582A (en) * | 1983-11-24 | 1985-06-21 | Mitsubishi Heavy Ind Ltd | Prevention of corrosion in joint part of different materials |
| US4855029A (en) * | 1987-09-11 | 1989-08-08 | Titeflex Corporation | Integral cathodic protection device |
| SU1546513A1 (en) * | 1988-02-01 | 1990-02-28 | Институт Физической Химии Ан Ссср | Alloy for cathode protection anode |
| EP0443229A1 (en) * | 1990-02-20 | 1991-08-28 | Ebonex Technologies, Inc. | Electrically conductive composition and use thereof |
| EP0503678A1 (en) * | 1991-03-15 | 1992-09-16 | Materials Protection Company | Cathodic protection system and method for above-ground storage tank bottoms |
Non-Patent Citations (2)
| 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)
| 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 (en) * | 2022-03-25 | 2022-05-31 | 安徽萍聚德医疗科技股份有限公司 | Pipeline system for sterile water preparation |
| CN114562619B (en) * | 2022-03-25 | 2023-05-19 | 安徽萍聚德医疗科技股份有限公司 | Pipe system for sterile water preparation |
Also Published As
| Publication number | Publication date |
|---|---|
| GR3022439T3 (en) | 1997-04-30 |
| DE59305062D1 (en) | 1997-02-20 |
| EP0598429B1 (en) | 1997-01-08 |
| ES2096850T3 (en) | 1997-03-16 |
| DE4238751A1 (en) | 1994-05-19 |
| ATE147445T1 (en) | 1997-01-15 |
| DK0598429T3 (en) | 1997-01-27 |
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