US3809640A - Sacrificial anode - Google Patents

Sacrificial anode Download PDF

Info

Publication number
US3809640A
US3809640A US00247860A US24786072A US3809640A US 3809640 A US3809640 A US 3809640A US 00247860 A US00247860 A US 00247860A US 24786072 A US24786072 A US 24786072A US 3809640 A US3809640 A US 3809640A
Authority
US
United States
Prior art keywords
anode
carrier
sacrificial
cast
sacrificial anode
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
US00247860A
Other languages
English (en)
Inventor
G Jacob
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.)
Alcan Holdings Switzerland AG
Original Assignee
Alusuisse Holdings 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 Alusuisse Holdings AG filed Critical Alusuisse Holdings AG
Application granted granted Critical
Publication of US3809640A publication Critical patent/US3809640A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/10—Electrodes characterised by the structure
    • 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
    • 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
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/18—Means for supporting electrodes

Definitions

  • the invention concerns a sacrificial anode, consisting of a finely porous aluminium casting as an anode and an anode carrier of steel attached thereto whereby between the anode carrier and the casting is provided a diffusion zone of anode or similar material in order to maintain a constant internal resistance of said structure during its operational life.
  • the invention relates to sacrificial anodes and the fixing thereof to anode carriers.
  • Sacrificial anodes consisting of a body cast from aluminum or alloys thereof, with anode carriers consisting of steel cast into the body. Such anodes are used for production of a corrosion-resisting coating on an object cathodically connected to the sacrificial anode, when the body and the object are received in an electrolyte.
  • Constructions of this kind initially fulfill their intended purpose satisfactorily. It has however appeared that during a prolonged period of operation the protective action of the anode slackens. The reduction of protective action depends on a progressively declining electron current flowing from the anode through the anode carrier to the cathodically connected object. This arises from the increasing internal resistance of the anode with increasing period of operation and from the progressively deteriorated repulsion of the oxidation products.
  • a sacrificial anode consists of a finely porous cast body of aluminum or an alloy thereof, and an anode carrier of steel connected with the cast body by a diifusion zone.
  • the invention also includes anodes in which instead of aluminum the cast body is of finely porous magnesium, zinc or alloys thereof.
  • a build-up of potential without delay is achieved by the finely porous cast structure.
  • the difiusion zone provides an internal split-free connection of the anode and anode carriers, whereby the formation of hydroxide layers with or without mixtures of oil is avoided.
  • Sacrificial anodes constructed according to the invention do not show the ageing phenomena of the known constructions which are characterized by falling output of cathodic current.
  • FIG. 1 is a perspective view of a sacrificial anode with cast-in anode carriers
  • FIG. 2 is a detail of FIG. 1.
  • FIG. 1 shows a sacrificial anode 10 which is fastened by means of anode carriers 11 to an object to be cathodically protected, for example a wall part 12 of an oil-water ballast tank, as used on tank ships.
  • the sacrificial anode 10 consists of a finely porous casting, whereby finely porous such a size of opening of the pores is to be understood, that, by the eftect of the capillary forces on the water brought into being by the pores, entry of the oil into the latter is hindered.
  • FIG. 2 shows as a detail the connection of the sacrificial anode 10 with the anode carrier 11. It is of significance for the invention that between the anode carrier 11 constructed of steel and the sacrificial anode 10 there exists a diffusion zone 13, i.e. a zone consisting of aluminum introduced into the surface of the anode carrier 11. It is suitable to provide the anode carrier 11 with an aluminum layer, which is connected by means of a diffusion zone 13 with the anode carrier 11. If the anode carrier 11 is wetted by the liquid anode material then the anode material and the anode carrier layer unite into an internal connection free of splits and hair cracks.
  • a diffusion zone 13 i.e. a zone consisting of aluminum introduced into the surface of the anode carrier 11.
  • a sacrificial anode consisting of a cast body wherein said cast body is composed of a member of the group consisting of aluminum, magnesium, zinc or alloys thereof, said cast body being finely porous with pores of such fineness that by capillary action water may enter into the pores, but the entry of oil will be restrained;
  • an anode carrier composed of steel

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)
US00247860A 1971-04-27 1972-04-26 Sacrificial anode Expired - Lifetime US3809640A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH614171A CH540351A (de) 1971-04-27 1971-04-27 Opferanode

Publications (1)

Publication Number Publication Date
US3809640A true US3809640A (en) 1974-05-07

Family

ID=4304920

Family Applications (1)

Application Number Title Priority Date Filing Date
US00247860A Expired - Lifetime US3809640A (en) 1971-04-27 1972-04-26 Sacrificial anode

Country Status (6)

Country Link
US (1) US3809640A (xx)
CH (1) CH540351A (xx)
DE (1) DE2217716A1 (xx)
GB (1) GB1387875A (xx)
NL (1) NL7205650A (xx)
NO (1) NO131086C (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171254A (en) * 1976-12-30 1979-10-16 Exxon Research & Engineering Co. Shielded anodes
US20100096837A1 (en) * 2008-10-21 2010-04-22 Ehrlich Rodney P Trailer Coupler Assembly Including A Sacrificial Anode
US20210230752A1 (en) * 2020-01-24 2021-07-29 Richard L. Klopp Corrosion Inhibitor Apparatus for Land Vehicles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1272001B (it) * 1993-03-10 1997-06-10 Agip Spa Anodo sacrifiziale perfezionato per la protezione anticorrosiva di strutture offshore e procedimento per la sua realizzazione.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171254A (en) * 1976-12-30 1979-10-16 Exxon Research & Engineering Co. Shielded anodes
US20100096837A1 (en) * 2008-10-21 2010-04-22 Ehrlich Rodney P Trailer Coupler Assembly Including A Sacrificial Anode
US20210230752A1 (en) * 2020-01-24 2021-07-29 Richard L. Klopp Corrosion Inhibitor Apparatus for Land Vehicles

Also Published As

Publication number Publication date
GB1387875A (en) 1975-03-19
CH540351A (de) 1973-08-15
DE2217716A1 (de) 1972-11-09
NO131086B (xx) 1974-12-23
NL7205650A (xx) 1972-10-31
NO131086C (xx) 1975-04-02

Similar Documents

Publication Publication Date Title
US3226314A (en) Sacrificial zinc anode
ES425465A1 (es) Perfeccionamientos introducidos en los anodos de proteccionpara estructuras metalicas.
US2478478A (en) Potential gradient anode for galvanic protection
US3809640A (en) Sacrificial anode
US3830710A (en) Masked electrode structure and process for electrolytic deposition of metals
Loss Mechanism of erosion corrosion in fast-flowing liquids
US2913384A (en) Aluminum anodes
US3421990A (en) Sacrificial anode
US3321306A (en) Galvanic anode alloy and products produced therefrom
US3137642A (en) Method and means for protecting structures, machinery containers, etc. made of steel, copper, brass, bronze or similar materials against corrosion
EP0615002A1 (en) Improved spendable anode for anticorrosion protection of offshore structure, and process for manufacturing it
US3904378A (en) Steel clad stainless composite article
JPS56146886A (en) Production of coated type electrode of lead dioxide
JPH11323977A (ja) 水底トンネルの止水構造
US3455808A (en) Aluminum alloy and anodes formed thereof
US3147204A (en) Anodic prevention of hydrogen embrittlement of metals
US2772231A (en) Anodes for the protection of metal structures against corrosion
GB777816A (en) Improvements in or relating to consumable galvanic anodes for use in the cathodic protection of metal structures
GB960723A (en) Improvements in or relating to cathodic protection of metals
US3645879A (en) Construction of electrolytic cell
US3400068A (en) Pot shell for fused bath electrolysis
US3251758A (en) Use of cathodic protection in the manufacture of porous metal articles
RU178966U1 (ru) Устройство для электрохимической защиты от коррозии
USRE28188E (en) Method of fabricating a metallic clad product
USRE26261E (en) Anodic prevention of hydrogen embrittlement of metals