CN1107534A - Improves spendable anode for anticorrosion protection of offshore structures, and process for manufacturing it - Google Patents
Improves spendable anode for anticorrosion protection of offshore structures, and process for manufacturing it Download PDFInfo
- Publication number
- CN1107534A CN1107534A CN94104277A CN94104277A CN1107534A CN 1107534 A CN1107534 A CN 1107534A CN 94104277 A CN94104277 A CN 94104277A CN 94104277 A CN94104277 A CN 94104277A CN 1107534 A CN1107534 A CN 1107534A
- Authority
- CN
- China
- Prior art keywords
- anode
- anode material
- mould
- bearing part
- marine structures
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title abstract description 4
- 239000010405 anode material Substances 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract 3
- 238000010791 quenching Methods 0.000 claims description 7
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 201000007094 prostatitis Diseases 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 7
- 230000001681 protective effect Effects 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0017—Means for protecting offshore constructions
- E02B17/0026—Means for protecting offshore constructions against corrosion
-
- 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
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
- C23F2213/31—Immersed structures, e.g. submarine structures
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
A spendable anode for the anticorrosion protection of offshore structures, is constituted by a composite structure in which a first anodic material, which constitutes an external coating on the same anode carrier means, with said material having a more negative electrochemical potential than of the material which constitutes the offshore structure to be protected, is provided, in its turn, with an external coating constituited by a second anodic material the electrochemical potential of which is still more negative than of said first material. Furthermore, some types of anodic material, as well as a process for manufacturing such a spendable anode are specified.
Description
The present invention relates to a kind of new sacrificial anode that is used for the marine structures anticorrosion protection; this anode is because its special composite structure configuration; naturally bring the economic benefit except required anode material is reduced; also owing to form the fine and close sedimentary deposit of protectiveness, and improved the guard mode on marine structures surface.
The invention still further relates to the method for a kind of like this sacrificial anode of manufacturing.
According to prior art, adopt the marine structures protection against corrosion of sacrificial anode, one of technology that current this field of representative is the most commonly used, its development might be found from the anode material of efficient, weight and cost viewpoint of measures the best, for example aluminium, zinc and magnesium alloy people.
According to this technology; this sacrificial anode is made than constituting the more negative positive polarity material of marine structures material to be protected by kind of electrochemical potentials; it produces a potential difference, and this potential difference is set up protective current again, and this protective current makes and forms protectiveness calcic sedimentary deposit on the same structure.
Obviously, such potential difference is high more, and the electrochemical potentials of used anode material is just negative more.
On the other hand; the necessary protective current of the above-mentioned marine structures that adequately protects, except with have such as ocean conditions such as temperature, salinity, oxygen amounts outside the Pass, the most important thing is to depend on the surface appearance of protected marine structures; that is to say whether calcic sedimentary deposit or less is arranged.Therefore; by on can draw; commitment in protected marine structures useful life; protectiveness calcic sedimentary deposit does not fully form as yet; need maximum protective current; this electric current can reduce at the later stage of structure, and this quality with the calcic layer that the described starting stage forms is associated.
By on can know by inference; the fundamental that designs any sacrificial anode is; sacrificial anode provides the ability of high initial protective current in starting stage of structure useful life at sea, and can also keep the guard mode of described structure in the after-stage of its whole effective life.Yet; because the initial current that sacrificial anode can provide; outside the Pass having with ocean condition and its electrochemical potentials; also depend on its surface; thereby depend on its geometry; above-mentioned condition is in fact feasible, the physical dimension of this sacrificial anode and weight must according to the required initial current of protected marine structures and respectively these structure in the follow-up operational phase and protectiveness calcic layer form after the protective current of required generation determine.
So far; because magnesium and its alloy have high negative electricity chemical potential; so people ought to think; the sacrificial anode that is made of magnesium alloy is the optimum measure that solves marine structures protection against corrosion; this is because this kind anode produces high potential difference and the high initial anode current of generation that continues; thereby; can provide extremely effectively protection to above-mentioned structure; promptly cause fine and close calcic sedimentary deposit to form; this sedimentary deposit has reduced the numerical value of required protective current in the last stages of the effective life of described structure.Yet in fact this magnesium alloy anode can not work in the whole effective life of protected marine structures because anode efficiency is low, unless employed amount is greatly to the degree that can not approve economically because weight is big and cost is high.
In fact; the sacrificial anode of the protection marine structures of peak discharge use at present; be aluminium or kirsite; even it also can be in whole application life when operating weight is little guarantee to protect fully to the structure of need protection, condition is that the physical dimension by the described anode of suitable raising satisfies the needs to high initial current.
Purpose of the present invention; specifically eliminate above-mentioned defective; thereby provide a kind of like this sacrificial anode that is used for the marine structures anticorrosion protection; the high initial current that needs when it can provide beginning produces calcic deposit topping with the marine structures surface in required protection; and that its physical dimension still keeps is very little; simultaneously in the whole useful life period of structure, guarantee anticorrosion protection, keep light and handy and its weight is total.
Above-mentioned purpose is actually and reaches by the sacrificial anode of using a composite construction, anode material in this anode generally is made of zinc or aluminium alloys, this material is coated on the bearing part surface of this anode of supporting, constitute outer, this anode material outside coats second kind of anode material again, this material is magnesium alloy normally, and its electrochemical potentials is more negative than above-mentioned zinc or Al-alloy based anode material.
By this composite construction sacrificial anode advantage shown, that be better than the known conventional anode of prior art, in fact be owing to because of adopting the initial potential difference that sacrificial anode showed of two kinds of anode materials and the effect of anode efficiency, as a result, from their intrinsic properties, obtain maximum benefit.
In fact, the magnesium alloy that constitutes outermost layer in this manner and have low anode volume of passenger traffic and high negative electricity chemical potential all worked in the phase I of protected marine structures effective life, thereby it can make the physical dimension of this anode reduce; Yet; the anode material of internal layer; constitute by aluminium or kirsite; it only just works after described outmost magnesium layer all consumes; what it will work to it is the surface that has produced potential difference and be covered with fine and close calcic layer; Gu and need low protective current numerical value, like this in the residue of the useful working life of structure in the time limit, the weight of the internal layer anode material that the protection structure are required has just reduced.
Experiment test is the result show, uses the sacrificial anode of composite construction of the present invention, compares with the conventional sacrificial anode that prior art is known, can save greatly economically, can reach 20% the order of magnitude.
In a word; the sacrificial anode that is used for the marine structures anticorrosion protection comprises that is covered with an outer field bearing part; this skin is made up of than constituting the more negative anode material of described protected marine structures material a kind of electrochemical potentials; according to the present invention; it is characterized in that one deck electrochemical potentials second kind anode material skin more negative than above-mentioned anode material arranged again on the described anode material.
And, according to preferred feature of the present invention, make a kind of like this method that is suitable for the anticorrosion protection sacrificial anode of marine structures, comprise the steps: that the outer field anode material that described formation is carried the bearing part that this anode uses is cast in a suitable mold or Quench mould or the mould; Then described second kind of anode material centered on and be cast to around the established anode in the abovementioned steps in another suitable mold or Quench mould or mould.
Be illustrated more clearly in the present invention with reference to the accompanying drawings, accompanying drawing only is for illustrating a preferable embodiment, and the indefinite purpose, because always can carry out that some are technical, on the structure or technologic variation, and do not depart from scope of the present invention.Thereby; for example do not adopt two kinds of anode materials are cast in mold, Quench mould or the mould; make it to coat the priority step of anode bearing part with stacked system; this composite structure anode also can prepare like this; be about to described second kind of anode material spraying plating and had on the bearing part that is covering than the anode material that hangs down the negative electricity chemical potential, perhaps adopt coating method that the latter is plated with described second plate material to described.
On the other hand, obviously above-mentioned all method can make the composite anode with any cross section and length characteristic.
Below accompanying drawing is illustrated:
Fig. 1 illustrates the marine structures anticorrosion protection sacrificial anode stereogram that makes by the present invention;
Fig. 2 illustrates the longitudinal plan of vertically cutting open along anode center line among Fig. 1;
Fig. 3 illustrates the elevation of being done along transversal AA among Fig. 2;
Referring to above each figure; the bearing part of the anode for preparing; indicate with label 1, be opposite to the skin that the bearing part in suitable mold or Quench mould or the mould (not shown) provides one deck to form than the more negative anode material 2 of formation desire protection structure material by the cast electrochemical potentials.
Then described bearing part is placed another suitable mold or Quench mould or mould (figure is also not shown), then form skin than anode material 2 more negative anode materials 3 by the casting electrochemical potentials.
Claims (5)
1, a kind of sacrificial anode that is used for the marine structures anticorrosion protection; it comprises a bearing part that is covered with one deck by the outside coating of forming than the more negative anode material of material electrochemical current potential that constitutes protected marine structures; it is characterized in that described anode material is covered with one deck by second kind the exterior layer that anode material form more negative than above-mentioned anode material electrochemical potentials.
2, sacrificial anode according to claim 1 is characterized in that, the described anode material that is coated on described bearing part outside is made of aluminium alloys.
3, sacrificial anode according to claim 1 is characterized in that, the described anode material that is coated on described bearing part outside is a kirsite.
4, sacrificial anode according to claim 1 is characterized in that, described second kind of anode material is magnesium alloy.
5, a kind of described method that is applicable to the sacrificial anode of marine structures anticorrosion protection of the every claim in prostatitis of making; it is characterized in that; it may further comprise the steps: earlier the outer field anode material of this anode bearing part of described formation is cast in the mold or Quench mould or mould that suits; and then, be cast in another suitable mold or Quench mould or mould the anode that described second kind of anode material forms in the abovementioned steps.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000457A93 | 1993-03-10 | ||
| ITMI930457A IT1272001B (en) | 1993-03-10 | 1993-03-10 | PERFECTED SACRIFICIAL ANODE FOR THE ANTI-CORROSIVE PROTECTION OF OFFSHORE STRUCTURES AND PROCEDURE FOR ITS CONSTRUCTION. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1107534A true CN1107534A (en) | 1995-08-30 |
Family
ID=11365307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94104277A Pending CN1107534A (en) | 1993-03-10 | 1994-03-10 | Improves spendable anode for anticorrosion protection of offshore structures, and process for manufacturing it |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0615002A1 (en) |
| JP (1) | JPH06340986A (en) |
| CN (1) | CN1107534A (en) |
| BR (1) | BR9400848A (en) |
| CA (1) | CA2118658A1 (en) |
| IT (1) | IT1272001B (en) |
| NO (1) | NO940787L (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328063A (en) * | 2011-03-11 | 2012-01-25 | 中国海洋石油总公司 | Magnalium composite sacrificial anode and preparation method thereof |
| CN102328064A (en) * | 2011-03-11 | 2012-01-25 | 中国海洋石油总公司 | Magnalium composite sacrificial anode and preparation method thereof |
| CN104508187A (en) * | 2012-07-30 | 2015-04-08 | 建筑研究和技术有限公司 | Galvanic anode and method of corrosion protection |
| CN113122852A (en) * | 2021-04-25 | 2021-07-16 | 浙江钰烯腐蚀控制股份有限公司 | Preparation method of magnesium-aluminum composite anode and magnesium-aluminum composite anode |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6461082B1 (en) * | 2000-08-22 | 2002-10-08 | Exxonmobil Upstream Research Company | Anode system and method for offshore cathodic protection |
| JP5167863B2 (en) * | 2008-02-28 | 2013-03-21 | 株式会社Ｉｈｉ | Anode for forming anticorrosion electrodeposition coating on steel structure |
| EP2909361B1 (en) * | 2012-10-18 | 2018-12-19 | Gareth Glass | Protection of steel reinforced concrete elements |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1803523B1 (en) * | 1968-10-17 | 1970-03-05 | Stein Dr Ing Heinrich | Process for the production of sacrificial anodes for cathodic protection against corrosion |
| CH540351A (en) * | 1971-04-27 | 1973-08-15 | Alusuisse | Sacrificial anode |
| FR2364274A1 (en) * | 1976-09-13 | 1978-04-07 | Elf Aquitaine | CATHODIC PROTECTION OF A STRUCTURE AT SEA BY SACRIFICIAL ANODES |
| US4409081A (en) * | 1982-02-05 | 1983-10-11 | Terrase Leon J | Sacrificial anode |
| DK12989D0 (en) * | 1989-01-11 | 1989-01-11 | Joergen Hoegberg | HOLDER FOR SHIPPING ANODS |
-
1993
- 1993-03-10 IT ITMI930457A patent/IT1272001B/en active IP Right Grant
-
1994
- 1994-03-05 EP EP94200566A patent/EP0615002A1/en not_active Withdrawn
- 1994-03-07 NO NO940787A patent/NO940787L/en unknown
- 1994-03-09 CA CA002118658A patent/CA2118658A1/en not_active Abandoned
- 1994-03-09 BR BR9400848A patent/BR9400848A/en not_active Application Discontinuation
- 1994-03-10 JP JP6066643A patent/JPH06340986A/en not_active Withdrawn
- 1994-03-10 CN CN94104277A patent/CN1107534A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328063A (en) * | 2011-03-11 | 2012-01-25 | 中国海洋石油总公司 | Magnalium composite sacrificial anode and preparation method thereof |
| CN102328064A (en) * | 2011-03-11 | 2012-01-25 | 中国海洋石油总公司 | Magnalium composite sacrificial anode and preparation method thereof |
| CN104508187A (en) * | 2012-07-30 | 2015-04-08 | 建筑研究和技术有限公司 | Galvanic anode and method of corrosion protection |
| CN113122852A (en) * | 2021-04-25 | 2021-07-16 | 浙江钰烯腐蚀控制股份有限公司 | Preparation method of magnesium-aluminum composite anode and magnesium-aluminum composite anode |
Also Published As
| Publication number | Publication date |
|---|---|
| ITMI930457A0 (en) | 1993-03-10 |
| JPH06340986A (en) | 1994-12-13 |
| ITMI930457A1 (en) | 1994-09-10 |
| EP0615002A1 (en) | 1994-09-14 |
| BR9400848A (en) | 1994-11-08 |
| CA2118658A1 (en) | 1994-09-11 |
| IT1272001B (en) | 1997-06-10 |
| NO940787D0 (en) | 1994-03-07 |
| NO940787L (en) | 1994-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |