SE201284C1

SE201284C1 -

Info

Publication number: SE201284C1
Authority: SE
Publication date: 1965-01-01

Description

KLASS INTERNATIONELLSVENSK C23 f48 c11:13/00 PATENT- OCH REGISTRERINGSVERKET Ans. 4145/1960 inkom den 26/4 1960 utlagd den 12/4 196 ENGELHARD INDUSTRIES, INC., NEWARK, N.J. USA Anodkonstruktion fcir katodskyddssystem Uppfinuare: E P Anderson Prioritet beglird frau den 28 april 1959 (USA) Fareliggande uppfinning hanfor sig till, en anodkonstruktion for katodskydds,systent och narmare bestamt for sadana system installerade ombord, pa fartyg. CLASS INTERNATIONAL SWEDISH C23 f48 c11: 13/00 PATENT AND REGISTRATION AGENCY Ans. 4145/1960 filed on 26/4 1960 issued on 12/4 196 ENGELHARD INDUSTRIES, INC., NEWARK, N.J. United States Anode design for cathode protection systems Inventor: E P Anderson Priority as of April 28, 1959 (USA) The present invention relates to an anode construction for cathode protection systems and systems specifically for such systems installed on board ships.

Det är val kant att mycket av den rost och den korrosion som angriper metallskrov, sarskilt oceanghende fartygs skrov, fir en foljd av lokal elektrolytisk verkan. Denna verkan kan forebyggas med anvandning av s. k. katodskyddssystem, vid vilka likstram matas mellan fartygets sasom katod fungerande skrov och vanligen ett ant al anoder i kontakt med det omgivande vattnet och placerade nara skrovet. Dylika anoder aro vanligen monterade i oppningar i skrovet, pch elektriska inpasserande leclare aro Mande genomforda i skrovoppningarna med hjalp av packboxanordningar, sa att den skyddande strommen kan matas frail en stromkalla inombords till anoderna. It is a matter of choice that much of the rust and corrosion that attacks metal hulls, especially the hulls of ocean-going vessels, suffers from a local electrolytic effect. This effect can be prevented by the use of so-called cathode protection systems, in which direct currents are fed between the ship's as a cathode-functioning hull and usually a number of anodes in contact with the surrounding water and placed near the hull. Such anodes are usually mounted in openings in the hull, and electrical fittings are made through the hull openings by means of stuffing box devices, so that the protective current can be fed from a cold source inside the anodes.

Via katodskyddsystem ar darfar anoden det enda element som ar anbragt pa utsidan av fartyget och i kontakt med vattnet. Under de radande svara forhallandena maste anoderna uppfylla speciella krav. Eftersom de Oro utsatta for kemiska angrepp av havsvattnets elektrolytiska sonderdelningsprodukter maste ytorna vara korrosionsbestandiga. Darfor are adelmetallerna lampliga material for stromfarande anodiska ytor, och platina eller platinalegeringar aro allmant anvanda. I praktiken bilda antingen tunna folier med tjocklekar mom omradet cirka 0,25-0,12 mm eller en metallstomme belagd med adelmetall den metalliska delen av anodkonstruktionen. Via cathode protection systems, the anode is therefore the only element that is placed on the outside of the vessel and in contact with the water. During the radiating response conditions, the anodes must meet special requirements. Because de Oro is subject to chemical attack by the seawater electrolytic probe products, the surfaces must be corrosion resistant. Therefore, the noble metals are suitable materials for current anodic surfaces, and platinum or platinum alloys are widely used. In practice, either thin foils with thicknesses in the range of about 0.25-0.12 mm or a metal frame coated with noble metal form the metallic part of the anode structure.

Forutom kemiska angrepp aro anoderna utsatta for mekaniska skador. Dessa innefatta erosion av i vattnet suspenderade partiklar saint utmattning i metallen pa grund av standiga vibrationer, som framkallas av den utomordentligt kraftiga turbulensen I anodens omedelbara narhet. Alla dessa och aven andra faktorer bidraga till att fOrsamra adla metallplateringar efter en viss tid, och sedan korroderar metallen i stommen snabbt. In addition to chemical attacks, the anodes are subject to mechanical damage. These include erosion of particles suspended in the water due to fatigue in the metal due to constant vibrations, which are caused by the extremely strong turbulence in the immediate vicinity of the anode. All of these and other factors contribute to the accumulation of noble metal coatings after a certain period of time, and then the metal in the body corrodes quickly.

Nar det galler folier av adelmetall firms det ingen. belaggning .eller platering som kan forstOras, och darfor foredragas dylika folier framfor metalloverdragna konstruktiuner. Har upptrader emellertid en annan svarighet. Det ar val kant att metall icke kan forenas med de fiesta isolerande plastmaterial som innefatta ,organiska hogpolymeriserade produkter, t. ex. polytetrafluoreten. Delta material Oredrages i anodhallare fiir katodskydd pa grund .av saval dess isolerande egenskaper och mekaniska hallfasthet som dess motstand mot kemiska angrepp. De ovannananda anoderna av en platerad metallstomme aro stela. Genom att de vanligen arc framstallda av tjocka tradar, band eller dylikt kunna de monteras tamligen stadigt genom att de delvis baddas in i sina isolerande hallare. Vid folier upptrada ernellertid svarigheter. Dessa baddas i allmanhet in i plasthallaren tangs en kantyta, medan insidan av det centrals omradet utsattes for vattnet. Baksidan gor kontakt med en plan yta pa hallaren. Eftersom derma jam. forelsevis stora yta icke effektivt kan forenas med hallaren och pa grund av den ovannamn- 2 da turbulen.sen i den narmaste omgivningen, fir folien, utsatt fOr latta men stindiga vibrationer, vilka slutligen lecla tilt dess forstoring. Pa eft tidigt stadium, med sjalva folien fortfarand& i gott stand, kunna anslutningarna till den inpasserande traden skadas, varigen,om anOden blir fulista.n.digt overksam. When it comes to foil of noble metal, there is no firm. coating .or plating that can be understood, and therefore such foils are preferred over metal-coated structures. However, another responsibility appears. It is possible that metal cannot be combined with most insulating plastic materials which include organic highly polymerized products, e.g. polytetrafluoroethylene. Delta material Oredrages in anode holders for cathode protection due to both its insulating properties and mechanical resistance as well as its resistance to chemical attack. The above anodes of a plated metal frame are rigid. Because they are usually arc made of thick threads, ribbons or the like, they can be mounted fairly stably by being partially bathed in their insulating holders. In the case of foils, however, similarities occurred. These are generally bathed in a plastic surface tangent an edge surface, while the inside of the central area is exposed to the water. The back makes contact with a flat surface on the hall. Because derma jam. For the time being large surface area can not be effectively combined with the holder and due to the above-mentioned turbulence in the immediate vicinity, the foil is exposed to light but steady vibrations, which finally allow its magnification. At an early stage, with the foil itself still & in good condition, the connections to the passing line can be damaged, whereupon, if the anode becomes fulista.n.digt inactive.

Det är darfor ett huvudandamal med uppfinningen aft Oka motstandskraften mot mekaniska fel i anodkonstruktioner fOr katodskyddsystem. Narmare bestamt bar uppfinningen till andamal att astadkomma en anod, som utnyttjar en adelnaetallfolie anbragt i en plasthallare pa ett sadant salt att den. mot-star de pakanningar som harrora, Fran vibrationer pa grand av turbulens i det omgivande vattnet eller framkallade pa annat satt. It is therefore a principal object of the invention to increase the resistance to mechanical failure in anode structures for cathode protection systems. More particularly, the object of the invention is to provide an anode which utilizes a noble metal foil placed in a plastic holder on such a salt that it. counter-star the pakannanning which harrora, From vibrations on the grand of turbulence in the surrounding water or induced in another way.

En i illustrativt syfte angiven utfOringsform av uppfiningen, nanaligen en 'anodkonstruktion for katodskydd av fartyg, innefattar en hallare formad som en platta, en skiva av en adelmetallfolie i kontakt med hallarens ena yta och fors.edd med en skalformad fordjupfling utbildad i skivans, mitt. Fordjupningenliar,ett flertal genomghende perforeringar och ar inbfiddad i hallaren, sa att plastmaterialet fyller skhlen och fortsatter genom perforeringarna for att bilda en forbindning med aterstoden av plasthallaren. Enligt ett viktigt sardrag av uppfinningen omfattar darfor en anodkonstruktion en tunn platta av korrosionsbestandig me-tall, vilken platta har ett i huvudsak plant huvudparti oeh minst ett 'omrade utbockat ur plattans, plan for aft bilda en fordjupning. Det forsankta omradet har eft flertal genonighende perforeringar och är inbaddat i en isolerad hallare sh att urtagningen fylles med plastmaterial, som är bundet till aterstoden air hallaren genom perforeringarna. Det comrade av metallplattan som oinger forljupningen ligger plant mot plasthallaren och kan kvarhallas i data lage genom aft ett lfings omkretsen liggande omrade baddas in, sasom beskrives i det foljande. An illustrative embodiment of the invention, namely an anode structure for cathode protection of ships, comprises a holder shaped like a plate, a disc of a noble metal foil in contact with one surface of the holder and provided with a shell-shaped depression formed in the center of the disc. . The recesses lie, a plurality of through perforations and are embedded in the holder, so that the plastic material fills the shell and continues through the perforations to form a connection with the remainder of the plastic holder. According to an important feature of the invention, therefore, an anode construction comprises a thin plate of corrosion-resistant metal, which plate has a substantially flat main portion and at least one area bent out of the plate, plane to form a recess. The recessed area has several penetrating perforations and is embedded in an insulated holder sh that the recess is filled with plastic material, which is bonded to the remaining air holder through the perforations. The comrade of the metal plate which is not the recess lies flat against the plastic holder and can be retained in the data layer through the area lying around the circumference of a leaf, bathed in, as described in the following.

Enligt ett an,nat ,sardrag av uppfinningen är en dylik skfilform.ad fordjupning utforma,d vid det stO.11e, vanligen i plattans mitt, dar anslutningen till en stronakalla gores, t. ex. genom att bottenpartiet i anodplattans fordjupning svetsas fast mot en inpas,serande ledare, som stracker sig frau. anodplattan och genom laren. Eftersom fordjupningen ar fullstandigt inbaddad skyddas svetsan mot vibrationer eller andra mekaniska eller kemiska pa.verkningar, sa att let pa denna anslutning undgas. According to another feature of the invention, such a file-shaped depression is formed, d at the stO.11e, usually in the middle of the plate, where the connection to a strona-cold gores, e.g. by welding the bottom portion in the recess of the anode plate to a fitting, serrating conductor, which extends frau. the anode plate and through the lumen. Since the recess is fully embedded, the weld is protected against vibration or other mechanical or chemical influences, so that damage to this connection is avoided.

Del liar visat sig aft den kombinerade verkan av inbaddningen och den fOrstarkning, somu bibringats folien genom att minst ett fordjupat parti i folien anordnats, resulterar i en anod, som forblir praktiskt taget vibrations- Fri 5.ven under ihallande svara driftsforhallanden. Part of this has been shown by the combined effect of the embedding and the reinforcement provided by the foil by arranging at least one recessed portion in the foil, resulting in an anode which remains practically vibrationally free even under continuous operating conditions.

Uppfinningen kommer att ytterligare belysas med harrvisning till bifogade ritning, som. iir ett tvarsnitt av en utforingsform. The invention will be further elucidated with reference to the accompanying drawing, which. in a cross section of an embodiment.

Pa ett fartygs skrov 6 ar en. hallare 8 fistad, som ar utford av is.olerande plast och i huvudsak har form.en av en svamp. Hallare.n 8 innefattar salunda en plan, eirkular platta 10 och ett cylindriskt skaft 12 fastat i plattans mitt. Ett anslutningsstift 14 Or inbaddat i och passerar axiellt genom skaftet 12 och plattan 10. Den.'sida av hallarplattan 10 som upptager skaftet 12 fir -and mot skrovet 6, medan den mots,atta sidan uppbar en korrosionsbestandig skiva eller tuna platta 16, i allmanhet en cirkular platinaskiva eller en liknande skiva av en. platinalegering. Goda resultat ha erhallits med anvandande av en legering med cirka 80 viktprocent platina och cirka 20 viktprocent palladium. Skivans tjocklek kan vara omkring 0,12 nun. Ett jamfOrelsevis small o,mrade 18 langs ski-vans 16 omkrets, Or boekat ut ur skivans, plan, och den kantlist som erhalles pa sa. satt Or inbaddad i hallarens, platta 10, sa att ett stadigt grepp astadkommes hela vagen runt anodskivans 16 omkrets. On the hull of a ship 6 is one. hallare 8 fistad, which is challenged by ice-insulating plastic and mainly has the shape of a sponge. The holder 8 thus comprises a flat, circular plate 10 and a cylindrical shaft 12 fixed in the middle of the plate. A connecting pin 14 is embedded in and passes axially through the shaft 12 and the plate 10. The side of the holding plate 10 which receives the shaft 12 faces the hull 6, while the opposite side carried a corrosion resistant disc or thin plate 16, in generally a circular platinum disc or a similar disc of one. platinum alloy. Good results have been obtained by using an alloy with about 80% by weight of platinum and about 20% by weight of palladium. The thickness of the disc can be about 0.12 nun. A comparatively small o, mrade 18 along the circumference of the disc 16, Or booked out of the disc, plane, and the edging obtained on so. sat Or immersed in the hallar's, plate 10, said that a firm grip is achieved the whole way around the circumference of the anode plate 16.

Enligt den utforingsform av uppfinningen som visas pa ritningen, hay skivan 16 ytterligare ett omrade som Or utbockat ur ski-vans plan, sa att en skalformig fordjupning bildas med en ringformig vagg 20 och en botten 22. Bottenpartiet 22 ar fastsvetsat pa en flans 24, som i sin tur utgor en del av anslutningsstiftet 14. Det sienare bildar en elektrisk anslutning till den positiva polen air en stromkalla 26, lampligan med hjalp av en kontakthylsa 28. Den skalformiga fordjupningen Or fylld med plastmaterial, foretradesvis detsamma som hallaren 8 Or utformad av, lampligen polytetrafluoreten, eller nag,ot annat lampligt material soni kan bilda en fast forbindning med materialet i hallaren 8. Perforeringarna 25 1 vaggpartiet 20 medgiva att plastmaterialet inuti fordjupningen forbindes med det utanfor liggande. Plastmaterialet i fordjupningen Or pa ritningen visat delvis utbrutet for att visa perforeringarna 25. Eftersom de senare Oro radiellt anordnade genom vaggen 20, Mir det forsankta omradet forankrat i hallaren pa ett sadant satt, att det effektivt motstar forskjutning i varje riktning. Med den langs omkretsen gaende kantlisten 18 och det centrala omradet i form av den. perforerade fordjup,ningen inbaddade och forankrade i plasten, blir den ringformiga area av ski-van. 16, soon befinner sig mellan dessa inbaddade par-tier och under kontakt med hallarplattans 10 utsida, stadigt fasthallen mot derma utsida. Vibrationer i folien forhindras saledes eller 3 aro atminsione reducerade till ett minimum. Mojligheterna till forsannin.g av anordningen som en foljd av vibrationer i skivan pâ grund av turbulens i det omgivande vattnet dro praktiskt taget fullstandigt eliminera:de. According to the embodiment of the invention shown in the drawing, the disc 16 has a further area bent out of the plane of the disc, so that a shell-shaped depression is formed with an annular cradle 20 and a bottom 22. The bottom portion 22 is welded to a flange 24, which in turn forms part of the connecting pin 14. The seine forms an electrical connection to the positive pole air a current source 26, the lamp joint with the aid of a contact sleeve 28. The shell-shaped recess Or filled with plastic material, preferably the same as the holder 8 Or formed of , suitably polytetrafluoroethylene, or nag, or other suitable material soni can form a solid connection with the material in the holder 8. The perforations 25 in the cradle portion 20 allow the plastic material inside the recess to be connected to that lying outside. The plastic material in the recess Or shown in the drawing is partially broken away to show the perforations 25. Since the latter Oro are arranged radially through the cradle 20, Mir the recessed area is anchored in the holder in such a way that it effectively resists displacement in each direction. With the circumferential edging 18 and the central area in the form of it. perforated depressions, the ning embedded and anchored in the plastic, becomes the annular area of the ski van. 16, is soon between these embedded portions and in contact with the outside of the holder plate 10, firmly holding the hall towards this outside. Vibrations in the foil are thus prevented or 3 aro atminsione reduced to a minimum. The possibilities of forcing the device as a result of vibrations in the disc due to turbulence in the surrounding water were practically completely eliminated.

For att montera de oval" beskrivna anodorganen trycktatt i skrovet är det senare for-sett med hal och trycktatningar eller packboxar fdstade i Mien. Ett exempel pa en lamp-hg tatning visas pa ritningen.. Tatningen hmefattar en r5rformig, med utvdndig ganga forsedd hylsa 30, som ar svetsad i ett Ml i skrovet. En ringformig packmutter 32 ingriper med den gdngade hylsan for komprimering av en packning 34. Harigenom erhalles en tat tatning mellan skaftet 12 och hylsans 30 insida. Oppningen genom packmuttern 32 Idinnar ett tillrackligt spel for del utskjutande anslutningsstiftet 14 och kontakthylsan 28, som ingriper med stiftets dndparti. Om O. onskas, kan den beskrivna tatningen ersfittas av nagon annan lamplig konstruktion. En automatiskt install- harsom kan anvandas beskrives i det norska patentet 96 412. In order to mount the oval "described anode members pressurized in the hull, the latter is provided with a hole and pressure seals or stuffing boxes fixed in Mien. An example of a lamp-high seal is shown in the drawing. The seal comprises a tubular sleeve with an external thread An annular packing nut 32 engages the threaded sleeve to compress a gasket 34. This provides a tight seal between the shaft 12 and the inside of the sleeve 30. The opening through the packing nut 32 provides a sufficient clearance for the part. projecting the connecting pin 14 and the contact sleeve 28, which engage with the end portion of the pin.If desired, the described seal can be replaced by any other suitable construction.An automatic installer which can be used is described in Norwegian patent 96 412.

Anodanordningen har ovan beskrivits sasona innefattande en enda, centralt anordnad, perforera.d fordjupning, vars bottenparti 22 dr .anslutet till stiftet 14. Ehuru goda resultat erhallas med delta arrangemong, kan man, iiär det galler storre anodskivor, anordna ett flertal f8rdjupningar i vorje Onskat m8nster, t. ,ex. i cirkulfira eller radiella arrangemang. Rektangulara anodfolier kunna ock.sa fdstas pa en hallare med dylika anordningar. The anode device has been described above comprising a single, centrally arranged, perforated depression, the bottom portion 22 of which is connected to the pin 14. Although good results are obtained with delta arrangements, it is possible, in the case of larger anode discs, to arrange a plurality of depressions in Onskat m8nster, t., Ex. in circular or radial arrangements. Rectangular anode foils can also be mounted on a holder with such devices.

Det torde vara tydligt, att manga fler modifikationer kunna eras, mom ramen f8r uppfinningen utan att man avlagsnar sig fran dess ide, och uppfinningen innesluter samtliga dylika modifikationer. It should be apparent that many more modifications may be made within the scope of the invention without departing from the spirit thereof, and the invention includes all such modifications.

Claims

Patent claim:

Anode construction for cathode protection systems, in which an anode mounted on the outside of a ship's hull is connected to an electric current source, wherein the anode is mounted on a holder (8) of a plastic insulating material of plastic or characterized by a turn, metal plate (16 ), which serves as an anode and Si for-Redd with a recessed or recessed portion (20, 22) with through perforations (25), the plate (16) being fixed to the holder (8) by its outer edges (18) being bent over and embedded in the holder, each with the recess (20, 22) being filled with plastic material, which through the perforations (25) is connected with the plastic material in the holder, saint of conductor (11, 24) for the connection of the plate (16) to the electric current source. .

Anode construction: according to claim 1, characterized in that the conduits (14, 24) for the connection of the plate (16) to an electric current source are connected to the bottom (22) of the sunken or recessed portion of the plate.

Anode construction according to claim 1, cheek-drawn drive, that the holder (8) comprises a flat portion (10), so that the metal plate (16) extends substantially flat and is in contact with and fixed to the nanancla pima portion of hMlaren. Request publications: Patents Iran USA 994405, 2 776 940.