CN102453918A - Sacrificial anode with high superficial area - Google Patents
Sacrificial anode with high superficial area Download PDFInfo
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- CN102453918A CN102453918A CN2010105301539A CN201010530153A CN102453918A CN 102453918 A CN102453918 A CN 102453918A CN 2010105301539 A CN2010105301539 A CN 2010105301539A CN 201010530153 A CN201010530153 A CN 201010530153A CN 102453918 A CN102453918 A CN 102453918A
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Abstract
The invention provides a sacrificial anode with high superficial area, which comprises an anode body and an anode core; the anode body is sleeved outside the anode core; both the longitudinal section and the horizontal section of the anode body are trapezoidal; the sacrificial anode is characterized in that inwardly concave edges are arranged at four sides of the horizontal trapezoidal section of the anode body respectively; the sectional area of an inwardly concave part is distributed at the height and the width of the anode body; the length of the anode body is kept constant so that the volume of the anode body is constant; the sacrificial anode has higher superficial area and is capable of outputting higher anode current, thus, a protected structural body rapidly forms a calcium-magnesium deposition layer in early stage, and the protection current in middle and later stages is reduced; therefore, the use amount of the sacrificial anode is reduced on the whole; and the cost of an ocean engineering cathode protection device is reduced.
Description
Technical field
The present invention relates to the corrosion protection apparatus of ocean engineering structure, relate in particular to a kind of sacrificial anode that in the ocean engineering structure galvanic protection, uses with high surface area.
Background technology
Because corrosion in various degree all can take place the different zones that ocean engineering structure is in the ocean environment, these corrosion are most of to be galvanic corrosion.For example, all bear different zones, corrosion in various degree at the ocean structure of tidal range district, splash zone and atmospheric zone.
In order to protect the marine structure protect it from corrosion, nearly all marine structure all adopts the galvanic protection mode to prevent that corrosive from taking place and development.Galvanic protection is a kind of important corrosion protection method, and it is divided into impressed current protection and sacrificial protection.The former is with being linked to each other by the sacrificial anode of protecting the more negative active metal of metal and current potential to process, form the galvanic couple battery, relying on sacrificial anode constantly to dissolve the cathodic current that is produced and realize galvanic protection; The latter is be connected the cathodic current realization galvanic protection that utilizes power supply to provide with the negative pole of direct supply by protective.Compare with impressed current method; Sacrificial anode protection have do not need external dc power supply, to the adjacent metal facility disturb little, distribution of current evenly, system's single investment cost is low and advantage such as manageable maintenance, thereby in antiseptic project, has obtained widespread use.In the use, sacrificial anode is welded to by on the protection works, the consumption through sacrificial anode itself is that works provides protection.Its advantage is that design and construction are simple, does not need to safeguard, protects effective.
The protective current density of ocean engineering structure cathodic protector design is to design different numerical respectively according to the different steps in initial stage, mid-term and the later stage of works galvanic protection.At the galvanic protection initial stage; The works surface is naked steel; This time, body structure surface did not also form the calcium deposition layer; Therefore the initial stage polarization needs sacrificial anode can produce the polarization of big electric current with the accelerating structure thing, accelerates the formation of calcium deposition layer, so that works can be polarised to protection potential within a short period of time; Be the phase of keeping during the stable galvanic protection after the initial stage polarization, the protective current density that this phase of keeping needs is less, because after the big current polarizing in the early stage, the works surface has formed the calcium deposition layer, at this moment needed protective current density is less.
Existing oceanographic engineering uses the long strip type sacrificial anode to be mostly trapezoidal or the square-section, and the sacrificial anode in this cross section is little with surface-area variation in mid-term in the early stage.If in the more marine site of ocean current; This anode can not make and formed calcium magnesium settled layer in the early stage fast by the protective surface, and the electric current that anode sends is bigger always, and anode consumption speeds up; Fall with regard to completely consumed mid-term under arms, bring potential safety hazard to offshore production.
Shown in Fig. 1, Figure 1A; Be the sacrificial anode structure used in the existing Cathodic Protection System for Marine Structure device and the cross-sectional shape of anode bodies; Mainly comprise anode bodies 1 and circular anode core 2; Anode bodies 1 is set in circular anode core 2 outsides and is combined into sacrificial anode through casting, and the longitudinal cross-section of this anode bodies 1 and lateral cross section are trapezoidal.The anode body surface in this cross section is long-pending less, and is therefore very little in galvanic protection different protection phase table area change, particularly can not provide big electric current to quicken polarization effectively at the galvanic protection initial stage, therefore haves much room for improvement.
Summary of the invention
Main purpose of the present invention is to overcome the above-mentioned shortcoming that existing anode exists, and a kind of sacrificial anode with high surface area is provided, and comprises anode bodies and anode core; It is outside that this anode bodies is set in the anode core, and the shape of anode bodies longitudinal cross-section and lateral cross section be trapezoidal, the edge that is respectively equipped with concave all around of the trapezoidal lateral cross section of this anode bodies; Make sacrificial anode have bigger surface-area; Can export bigger anodic current, make to be formed calcium magnesium settled layer in the early stage fast by the protection structure, the protective current of middle and later periods reduces; Thereby reduced the sacrificial anode consumption on the whole, reduced the cost of oceanographic engineering cathodic protector.
The objective of the invention is to realize by following technical scheme.
The present invention has the sacrificial anode of high surface area, comprises anode bodies and anode core, and it is outside that this anode bodies is set in the anode core, and the shape of this anode bodies longitudinal cross-section and lateral cross section is trapezoidal; It is characterized in that be set as the edge of concave around the trapezoidal lateral cross section of said anode bodies respectively, the sectional area of this female parts is distributed in the height and the width of anode bodies, holding anode body length weighing apparatus is fixed, makes anode bodies volume weighing apparatus fixed.
Aforesaid sacrificial anode with high surface area; The concave edge that wherein is respectively equipped with around the trapezoidal lateral cross section of anode bodies is the concave semicircular edge; This concave semicircular edge is formed in one around the trapezoidal lateral cross section of anode bodies; The sectional area of this concave semi-circular portions is distributed in the height and the width of anode bodies, and holding anode body length weighing apparatus is fixed, makes anode bodies volume weighing apparatus fixed.
Aforesaid sacrificial anode with high surface area; The concave semicircular edge that wherein is respectively equipped with around the trapezoidal lateral cross section of anode bodies is two; The sectional area of these eight concave semi-circular portions is distributed in the height and the width of anode bodies, and holding anode body length weighing apparatus is fixed, makes anode bodies volume weighing apparatus fixed.
Aforesaid sacrificial anode with high surface area, wherein the anode bodies material is aluminium, zinc material, magnesium material, aluminium zinc composite wood, zinc-magnesium composite wood, magnalium composite wood or aluminium zinc-magnesium composite wood.
The present invention has the beneficial effect of the sacrificial anode of high surface area; The sacrificial anode that the present invention has high surface area is fixed to by on the protection works through welding process; When being installed in the seawater by the protection works, sacrificial anode will send electric current works will be implemented protection.Be respectively equipped with the edge of concave around the trapezoidal lateral cross section of this anode bodies; Make sacrificial anode have bigger surface-area; Can export bigger anodic current, make to be formed calcium magnesium settled layer in the early stage fast by the protection structure, the protective current of middle and later periods reduces; Thereby saved the consumption of sacrificial anode on the whole, reduced the cost of oceanographic engineering cathodic protector.
Description of drawings:
Fig. 1 is existing conventional sacrificial anode structural representation.
Figure 1A is existing conventional sacrificial anode cross-sectional structure synoptic diagram.
Fig. 2 has the sacrificial anode structural representation of high surface area for the present invention.
Fig. 2 A has the sacrificial anode cross-sectional structure synoptic diagram of high surface area for the present invention.
Fig. 3 is existing conventional cross section sacrificial anode and the present invention and the sacrificial anode sectional dimension comparison diagram with high surface area.
Main label declaration among the figure: 1 conventional sacrificial anode body; 2 conventional anode cores; 1 ' sacrificial anode body of the present invention; 2 ' anode core of the present invention; The conventional sacrificial anode body of A trapezoid cross section upper base width; A ' high surface area sacrificial anode body trapezoid cross section upper base width; The conventional sacrificial anode body of the B trapezoid cross section width of going to the bottom; B ' the high surface area sacrificial anode body trapezoid cross section width of going to the bottom; The conventional sacrificial anode body of H trapezoid cross section height; H ' high surface area sacrificial anode body trapezoid cross section height; The conventional sacrificial anode body of L1 top length; L1 ' high surface area sacrificial anode body top length; The conventional sacrificial anode body of L2 bottom lengths; L2 ' bigger serface sacrificial anode body bottom lengths; 3 concave edges.
Embodiment
Consult shown in Fig. 2, Fig. 2 A, the present invention has the sacrificial anode of high surface area, comprises anode bodies 1 ' and anode core 2 ', and this anode bodies 1 ' is set in anode core 2 ' outside, and the shape of this anode bodies 1 ' longitudinal cross-section and lateral cross section is trapezoidal; Its improvements are, are respectively equipped with the edge 3 of concave around this anode bodies 1 ' trapezoidal lateral cross section, and the sectional area of this female parts is distributed in the height and the width of anode bodies 1 ', and holding anode body 1 ' length weighing apparatus is fixed, make anode bodies 1 ' volume weighing apparatus fixed.
Consult shown in Fig. 2, Fig. 2 A; The present invention has the sacrificial anode of high surface area, and wherein, the concave edge 3 that is respectively equipped with around anode bodies 1 ' the trapezoidal lateral cross section is the concave semicircular edge; This concave semicircular edge is formed in one around anode bodies 1 ' trapezoidal lateral cross section; The sectional area of this concave semi-circular portions is distributed in the height and the width of anode bodies 1 ', and holding anode body 1 ' length weighing apparatus is fixed, makes anode bodies 1 ' volume weighing apparatus fixed.The concave semicircular edge 3 that is respectively equipped with around this anode bodies 1 ' trapezoidal lateral cross section is two, and the sectional area of these eight concave semi-circular portions is distributed in the height and the width of anode bodies, and holding anode body 1 ' length weighing apparatus is fixed, makes anode bodies 1 ' volume weighing apparatus fixed; And anode bodies 1 ' material is aluminium, zinc material, magnesium material, aluminium zinc composite wood, zinc-magnesium composite wood, magnalium composite wood or aluminium zinc-magnesium composite wood.
The sacrificial anode that the present invention has a high surface area is fixed to by on the protection works through welding process in use, and when being installed in the ocean environment by the protection works, the galvanic protection effect is played in polarization thereby sacrificial anode will make works.The method of use that the present invention has the sacrificial anode of high surface area is a prior art, so give unnecessary details no longer in detail.
According to electrochemical principle, the generation electric current of sacrificial anode is to be directly proportional with the surface-area of anode bodies.In order to send bigger polarizing current at the galvanic protection initial stage; The design that the present invention has the sacrificial anode of high surface area is according to this principle; Under the constancy of volume situation of anode bodies; Increase the surface-area at anode bodies initial stage, confirmed that through design calculation the surface-area of anode bodies can send bigger polarizing current at the galvanic protection initial stage, reached the purpose of acceleration initial stage polarization speed.
Below through a specific examples explanation:
Select a conventional long strip shape sacrificial anode as shown in Figure 1, unit is cm among the figure:
Anode bodies: (A+B) * H * (L1+L2)
Anode core: Φ 11.4 * 0.6 * 390
The conventional sacrificial anode body of A-----top width
The conventional sacrificial anode body of B-----bottom width
The conventional sacrificial anode height of H-----degree
The conventional sacrificial anode body of L1----top length
The conventional sacrificial anode body of L2----bottom lengths
Conventional sacrificial anode body: (20+22) * 23 * (270+290)
Conventional sacrificial anode body length:
Conventional sacrificial anode body girth:
Conventional sacrificial anode body surface area: S=2 * (23 * 270+10 * 23)+270 * 20+290 * 22+2 * (20 * 23+23)-3.14 * (11.4/2)
2* 2=25421.96cm
2
Conventional sacrificial anode body equivalent diameter: D=ci/ π=28.03cm
Conventional sacrificial anode body water receiving resistance:
R=ρ [Ln (8 x Li/Di)-1]/(2 x, 3.14 x Li)=0.048 Ω (seawater resistivity ρ gets 25 Ω cm)
The initial outward current of sacrificial anode: I=Δ E (driving voltage)/R=0.25/0.048=5.2A
The high surface area sacrificial anode is under the situation that does not change anode bodies volume and length; With the edge 3 that is respectively equipped with 2 semicircle concave around the trapezoidal lateral cross section of conventional sacrificial anode body; It is the edge 3 that 8 semicircle concave are set altogether all around of the trapezoidal lateral cross section of anode bodies; This semicircular radius all is r=4cm, and is as shown in Figure 2.
In order to guarantee the constancy of volume of sacrificial anode body, the sectional area of concave edge 3 female parts is distributed in the height and the width of anode bodies, but anode bodies length is constant, makes that anode bodies volume weighing apparatus is fixed.
The area of the edge female parts of 8 semicircle concave is in the present embodiment:
S＝π×4
2×8/2＝200.96cm
2
Conventional anode height is increased 4cm, and width then increases (200.96-20 * 4)/(23+4) ≈ 4.5cm.
A’＝A+4.5＝24.5
B’＝B+4.5＝26.5
H’＝H+4＝27
L1’＝L1＝270
L2’＝L2＝290
A '-----high surface area sacrificial anode body top width
B '-----high surface area sacrificial anode body bottom width
H '-----high surface area sacrificial anode height degree
L1 '----high surface area sacrificial anode body top length
L2 '----high surface area sacrificial anode body bottom lengths
High surface area sacrificial anode: (24.5+26.5) * 27 * (270+290)
High surface area sacrificial anode body length:
High surface area sacrificial anode body girth:
High surface area sacrificial anode body surface area: S '=2 * (27 * 270+10 * 27)+270 * 24.5+290 * 26.5+2 * (24.5 * 27+27)-3.14 * (11.4/2)
2* 2=30592.96cm
2
High surface area sacrificial anode body equivalent diameter: D '=C '/π=45.07cm
High surface area sacrificial anode water receiving resistance: R=ρ [Ln (8 x L '/D ')-1]/(2 x, 3.14 xL ')=0.041 Ω (seawater resistivity ρ gets 25 Ω cm)
The initial outward current of sacrificial anode: I=Δ E (driving voltage)/R=0.25/0.041=6.10A
The sacrificial anode surface-area changes: (30592.96-25421.96)/and 25421.96 * 100%=20.3%
The sacrificial anode equivalent diameter changes: (45.07-28.03)/and 28.03 * 100%=60.8%
Sacrificial anode water receiving resistance change: (0.048-0.041)/0.048 * 100%=14.6%
The initial outward current of sacrificial anode changes: (6.10-5.2)/and 5.2 * 100%=17.3%
The big surperficial anode of the present invention is under the situation of length and constancy of volume; Surface-area has increased by 20.3%; Equivalent diameter has increased by 60.8%, thereby makes water receiving resistance reduce 14.6%, and the initial outward current of anode has increased by 17.3%; Be that the high surface area sacrificial anode can be exported bigger anodic current, make to be formed calcium magnesium settled layer in the early stage fast by protective.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (4)
1. the sacrificial anode with high surface area comprises anode bodies and anode core, and it is outside that this anode bodies is set in the anode core, and the shape of this anode bodies longitudinal cross-section and lateral cross section is trapezoidal; It is characterized in that be set as the edge of concave around the trapezoidal lateral cross section of said anode bodies respectively, the sectional area of this female parts is distributed in the height and the width of anode bodies, holding anode body length weighing apparatus is fixed, makes anode bodies volume weighing apparatus fixed.
2. the sacrificial anode with high surface area according to claim 1; It is characterized in that; The concave edge that is respectively equipped with around the trapezoidal lateral cross section of said anode bodies is the concave semicircular edge, and this concave semicircular edge is formed in one around the trapezoidal lateral cross section of anode bodies, and the sectional area of this concave semi-circular portions is distributed in the height and the width of anode bodies; Holding anode body length weighing apparatus is fixed, makes anode bodies volume weighing apparatus fixed.
3. the sacrificial anode with high surface area according to claim 2; It is characterized in that; The concave semicircular edge that is respectively equipped with around the trapezoidal lateral cross section of said anode bodies is two; The sectional area of these 8 concave semi-circular portions is distributed in the height and the width of anode bodies, and holding anode body length weighing apparatus is fixed, makes anode bodies volume weighing apparatus fixed.
4. the sacrificial anode with high surface area according to claim 1 and 2 is characterized in that, said anode bodies material is aluminium, zinc material, magnesium material, aluminium zinc composite wood, zinc-magnesium composite wood, magnalium composite wood or aluminium zinc-magnesium composite wood.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105301539A CN102453918A (en) | 2010-10-29 | 2010-10-29 | Sacrificial anode with high superficial area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105301539A CN102453918A (en) | 2010-10-29 | 2010-10-29 | Sacrificial anode with high superficial area |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106825433A (en) * | 2017-03-29 | 2017-06-13 | 中海油（天津）管道工程技术有限公司 | Suitable for the mould and its sacrificial anode casting method of the casting of T-shaped sacrificial anode |
| CN106825549A (en) * | 2017-04-13 | 2017-06-13 | 江苏金奕达铜业股份有限公司 | A kind of copper particle with high surface area structure |
| CN108251850A (en) * | 2018-01-25 | 2018-07-06 | 中交四航工程研究院有限公司 | A kind of foam aluminium alloy sacrificial anode and preparation method thereof |
| JP2019163505A (en) * | 2018-03-20 | 2019-09-26 | 株式会社Ihi | Corrosion prevention electrodeposition film formation method of in-water metal structure |
| CN110304361A (en) * | 2018-03-27 | 2019-10-08 | 中国石油天然气股份有限公司 | Liquid container |
| CN114351152A (en) * | 2021-12-07 | 2022-04-15 | 海洋石油工程股份有限公司 | String-shaped sacrificial anode applied to marine steel structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63100187A (en) * | 1986-10-16 | 1988-05-02 | Sanshin Ind Co Ltd | Corrosion inhibiting device for ship propeller |
| CN101463479A (en) * | 2007-12-18 | 2009-06-24 | 中国海洋石油总公司 | Special-shaped cross section sacrificial anode |
-
2010
- 2010-10-29 CN CN2010105301539A patent/CN102453918A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63100187A (en) * | 1986-10-16 | 1988-05-02 | Sanshin Ind Co Ltd | Corrosion inhibiting device for ship propeller |
| CN101463479A (en) * | 2007-12-18 | 2009-06-24 | 中国海洋石油总公司 | Special-shaped cross section sacrificial anode |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106825433A (en) * | 2017-03-29 | 2017-06-13 | 中海油（天津）管道工程技术有限公司 | Suitable for the mould and its sacrificial anode casting method of the casting of T-shaped sacrificial anode |
| CN106825549A (en) * | 2017-04-13 | 2017-06-13 | 江苏金奕达铜业股份有限公司 | A kind of copper particle with high surface area structure |
| CN108251850A (en) * | 2018-01-25 | 2018-07-06 | 中交四航工程研究院有限公司 | A kind of foam aluminium alloy sacrificial anode and preparation method thereof |
| JP2019163505A (en) * | 2018-03-20 | 2019-09-26 | 株式会社Ihi | Corrosion prevention electrodeposition film formation method of in-water metal structure |
| JP7066465B2 (en) | 2018-03-20 | 2022-05-13 | 株式会社Ihi | Method for forming anticorrosion electrodeposition coating on underwater metal structures |
| CN110304361A (en) * | 2018-03-27 | 2019-10-08 | 中国石油天然气股份有限公司 | Liquid container |
| CN114351152A (en) * | 2021-12-07 | 2022-04-15 | 海洋石油工程股份有限公司 | String-shaped sacrificial anode applied to marine steel structure |
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Application publication date: 20120516 |