CN102851670B - Aluminum alloy sacrificial anode for volumetric water heater - Google Patents
Aluminum alloy sacrificial anode for volumetric water heater Download PDFInfo
- Publication number
- CN102851670B CN102851670B CN201110174591.0A CN201110174591A CN102851670B CN 102851670 B CN102851670 B CN 102851670B CN 201110174591 A CN201110174591 A CN 201110174591A CN 102851670 B CN102851670 B CN 102851670B
- Authority
- CN
- China
- Prior art keywords
- anode
- water heater
- sacrificial anode
- boron
- sacrificial
- 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.)
- Active
Links
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention relates to an aluminum alloy sacrificial anode for volumetric water heater, mainly used for corrosion prevention of volumetric electric water heater, solar water heater and air source heat pump metal internal bladder in tap water environment. The anode adopts aluminum as raw material, and is added (by weight ratio) with zinc 3-10, tin 0.05-0.3, boron 0.02-0.09 and bismuth 0-0.12. The invention solves problems of existing sacrificial anode, such as insufficient drive voltage, low current efficiency, water quality pollution caused by dissolved product, and short service life.
Description
Technical field
The present invention relates to a kind of aluminium alloy sacrificial anode material, be mainly used in electric water heater, solar water heater and the corrosion prevention of air source heat pump metal inner tube in tap water environment.
Background technology
Metallic corrosion in water surrounding is to destroy one of principal mode of hardware and member, and it is current widely used a kind of anti-corrosion measure that hardware is applied to galvanic protection.Galvanic protection divides two kinds of impressed current and sacrificial protections, and sacrificial protection is more suitable for the inner bag protection of displacement type water heater.The method is using protected metal (inner bag) member as negative electrode; than the more negative metal of its current potential as sacrificial anode; be communicated with by wire; be placed in same ionogen (tap water) simultaneously; the electric current anticathode that constant dissolving in medium produces by means of the larger potential difference existing between negative electrode and anode and sacrificial anode polarizes, thereby suppresses the corrosion of cathodic metal.
The core component of electric water heater, solar water heater and air source heat pump is metal inner tube, inner bag is formed by mild steel plate or the weldering of stainless steel coiled sheet conventionally, although the internal surface contacting with tap water can spray one deck enamel material, but can not stop the exposure of metal-based layer completely, add for a long time in the hot water environment of 50 ~ 70 DEG C, the possibility that coating localized delamination is exposed metal-based layer is larger.Exposed metal can cause local corrosion with water generation chemical reaction, and especially local corrosion perforation more easily occurs in cylindrical shell commissure, directly causes water heater liner to leak and scraps.Therefore, adopt sacrificial anode to carry out galvanic protection to metal inner tube and become a kind of anti-corrosion measure that water-heater industry generally adopts.
The sacrificial anode material that can be used at present water heater liner corrosion prevention mainly contains low potential magnesium alloy and aluminium alloy, but this bi-material all exists technical defect.Low potential magnesium alloy is used as sacrificial anode and has following several problem in tap water: the one, and long-time use has Heisui River, rotten egg smell and the generation of black particle depositional phenomenon, reduces bath comfort degree; The 2nd, corrosion product magnesium hydroxide is the main component of incrustation scale, can increase because precipitation of scales is piled up the risk that causes heater element burning to be lost efficacy; The 3rd, current efficiency≤50%, actual capacitance≤1.2A.h/g, from seriously corroded; The 4th, corrosion product has hydrogen, can produce hydrogen embrittlement harm to some ferrous materials.Existing sacrificial aluminium alloy anode as GB/T4948-2002 aluminium zinc indium sacrificial anode is mainly used in the corrosion prevention of steel and iron member in Seawater, in passive state, does not reach the basic demand of sacrificial anode in tap water, also can not be used among water-heater; The disclosed technology contents of patent CN00100569.3 and CN1260408A is the very not applicable sacrificial anode material doing in positive displacement hot water also, major defect is as follows: the one, and current efficiency is lower, only have 35% ~ 40%, actual capacitance only has 1.0 ~ 1.1 A.h/g, and work-ing life is short; The 2nd, the operating potential calibration in tap water, is unsuitable for working in the tap water environment of high resistivity (water quality is better); The 3rd, interior tissue is thick, grain boundary corrosion easily occurs and cause bulk crystal grain to peel off, and erosion rate increases, and shorten work-ing life.The disclosed aluminium zinc of Chinese patent CN101586241A series sacrificial anode subject matter is the operating potential calibration in tap water, be unsuitable for using in the tap water of high resistivity, and the addition of zinc is large, the distributing homogeneity in aluminium is poor, causes chemical property unstable.
In sum; all there is certain defect as the galvanic protection of electric water heater inner bag in existing magnesium alloy and sacrificial aluminium alloy anode; make up above deficiency so need to research and develop novel sacrificial anode material, for water-heater product design, personnel provide larger choice.
Summary of the invention
The object of the present invention is to provide a kind of displacement type water heater sacrificial aluminium alloy anode, to solve, the operating potential that current sacrificial anode material in use exists is on the low side, current efficiency is on the low side, work-ing life is partially short, polluted water and the problem such as stability is poor.
For achieving the above object, the present invention takes following technical scheme:
A kind of displacement type water heater sacrificial aluminium alloy anode, its main component is: taking aluminium as raw material, add element zinc, it is characterized in that: also add element tin and boron.
A kind of preferred technical scheme, is characterized in that: also further add element bismuth.
A kind of preferred technical scheme, is characterized in that: the weight content of described element zinc is 3 ~ 10%.
A kind of preferred technical scheme, is characterized in that: the weight content of described element tin is 0.05 ~ 0.3%, the weight content of described element boron is 0.02 ~ 0.09%.
A kind of preferred technical scheme, is characterized in that: the weight content of described element bismuth is 0 ~ 0.12%.
A kind of preferred technical scheme, is characterized in that: described displacement type water heater, with in sacrificial aluminium alloy anode, also contains impurity, and the weight content of described impurity is Fe≤0.25%, Si≤0.25%, other impurity gross weight≤0.15%.
The present invention by adding alloying element in aluminium, improve the activity of aluminium in tap water, and activity can keep always, the open circuit potential-1.2V ~-1.3V(VS.SCE in tap water) (SCE is the abbreviation of Saturated Calomel Electrode, saturated calomel electrode.VS.SCE is the electromotive force with respect to SCE electrode), current efficiency >=50%, actual capacitance >=1.5A.h/Kg.Heisui River and black slag in use can not produce similar magnesium anode and dissolve time, with compared with sacrificial aluminium alloy anode, current efficiency and electrical capacity all increase with other fresh water; Interior tissue refinement, extend work-ing life; Open circuit potential is more negative, can in low-resistivity and high resistivity tap water environment, normally use.
Tool of the present invention has the following advantages:
1. improved the current efficiency of sacrificial anode., can there is uniform corrosion in sacrificial aluminium alloy anode of the present invention not passivation in tap water, current efficiency >=50%, and actual capacitance >=1.5A.h/g, more existing sacrificial anode improves more than 30%.
2. the open circuit potential in tap water is more negative, activity is higher.The open circuit potential of sacrificial anode of the present invention in tap water is-1.2V ~-1.3V(VS.SCE), can in the different water surroundings of high resistivity and low-resistivity, normally use, stronger than the versatility of general sacrificial anode.
3. solved the problem of sacrificial anode lysate polluted water.When sacrificial anode of the present invention uses, produce without Heisui River, smelly water and black slag phenomenon, can not affect water quality.
4. extended the work-ing life of sacrificial anode.By the inner grain structure that added beneficial element refinement, can there is not coming off of bulk crystal grain in sacrificial anode of the present invention, extended work-ing life in corrosion dissolution process.
Below by embodiment, the present invention will be further described, but and do not mean that limiting the scope of the invention.
Embodiment
embodiment 1
The each elemental composition part by weight of a kind of aluminium alloy sacrificial anode material is: zinc 8%, and tin 0.2%, boron 0.05%, all the other are aluminium, single impurity content Fe≤0.25%, Si≤0.25%, other impurity element total amount≤0.15%.
When preparation, make to be heated by resistive smelting furnace and carry out melting and alloying, adding of boron adopts aluminium boron master alloy (boracic part by weight 3%), and other adopts pure metal to add.Adopt plumbago crucible to hold aluminium ingot, zinc ingot metal and aluminum-boron alloy, after it melts completely, add again tin, fully stir, leave standstill and skim surface scum and pour into a mould with graphite rod.Both can be in mould when cast directly casting use as cast anode rod, also can first pour into cylindric billet, then on extrusion machine, be squeezed into thin rod, after cutting scale, use as extrusion anode rod.
embodiment 2
The each elemental composition part by weight of a kind of aluminium alloy sacrificial anode material is: zinc 3%, and tin 0.05%, boron 0.09%, all the other are aluminium, single impurity content Fe≤0.25%, Si≤0.25%, other impurity element total amount≤0.15%.
When preparation, make to be heated by resistive smelting furnace and carry out melting and alloying, adding of boron adopts aluminium boron master alloy (boracic part by weight 3%), and other adopts pure metal to add.Adopt plumbago crucible to hold aluminium ingot, zinc ingot metal and aluminum-boron alloy, after it melts completely, add again tin, fully stir, leave standstill and skim surface scum and pour into a mould with graphite rod.Both can be in mould when cast directly casting use as cast anode rod, also can first pour into cylindric billet, then on extrusion machine, be squeezed into thin rod, after cutting scale, use as extrusion anode rod.
embodiment 3
The each elemental composition part by weight of a kind of aluminium alloy sacrificial anode material is: zinc 10%, and tin 0.3%, boron 0.02%, all the other are aluminium, single impurity content Fe≤0.25%, Si≤0.25%, other impurity element total amount≤0.15%.
When preparation, make to be heated by resistive smelting furnace and carry out melting and alloying, adding of boron adopts aluminium boron master alloy (boracic part by weight 3%), and other adopts pure metal to add.Adopt plumbago crucible to hold aluminium ingot, zinc ingot metal and aluminum-boron alloy, after it melts completely, add again tin, fully stir, leave standstill and skim surface scum and pour into a mould with graphite rod.Both can be in mould when cast directly casting use as cast anode rod, also can first pour into cylindric billet, then on extrusion machine, be squeezed into thin rod, after cutting scale, use as extrusion anode rod.
embodiment 4
The each elemental composition part by weight of a kind of aluminium alloy sacrificial anode material is: zinc 3.5%, and tin 0.12%, boron 0.05%, bismuth 0.1%, all the other are aluminium, single impurity content Fe≤0.25%, Si≤0.25%, other impurity element total amount≤0.15%.
When preparation, make to be heated by resistive smelting furnace and carry out melting and alloying, adding of boron adopts aluminium boron master alloy (boracic part by weight 3%), and other adopts pure metal to add.Adopt plumbago crucible to hold aluminium ingot, zinc ingot metal and aluminum-boron alloy, after it melts completely, add again tin and bismuth, fully stir, leave standstill and skim surface scum and pour into a mould with graphite rod.Both can be in mould when cast directly casting use as cast anode rod, also can first pour into cylindric billet, then on extrusion machine, be squeezed into thin rod, after cutting scale, use as extrusion anode rod.
embodiment 5
The each elemental composition part by weight of a kind of aluminium alloy sacrificial anode material is: zinc 3%, and tin 0.3%, boron 0.02%, bismuth 0.12%, all the other are aluminium, single impurity content Fe≤0.25%, Si≤0.25%, other impurity element total amount≤0.15%.
When preparation, make to be heated by resistive smelting furnace and carry out melting and alloying, adding of boron adopts aluminium boron master alloy (boracic part by weight 3%), and other adopts pure metal to add.Adopt plumbago crucible to hold aluminium ingot, zinc ingot metal and aluminum-boron alloy, after it melts completely, add again tin and bismuth, fully stir, leave standstill and skim surface scum and pour into a mould with graphite rod.Both can be in mould when cast directly casting use as cast anode rod, also can first pour into cylindric billet, then on extrusion machine, be squeezed into thin rod, after cutting scale, use as extrusion anode rod.
embodiment 6
The each elemental composition part by weight of a kind of aluminium alloy sacrificial anode material is: zinc 10%, and tin 0.05%, boron 0.09%, bismuth 0.05%, all the other are aluminium, single impurity content Fe≤0.25%, Si≤0.25%, other impurity element total amount≤0.15%.
When preparation, make to be heated by resistive smelting furnace and carry out melting and alloying, adding of boron adopts aluminium boron master alloy (boracic part by weight 3%), and other adopts pure metal to add.Adopt plumbago crucible to hold aluminium ingot, zinc ingot metal and aluminum-boron alloy, after it melts completely, add again tin and bismuth, fully stir, leave standstill and skim surface scum and pour into a mould with graphite rod.Both can be in mould when cast directly casting use as cast anode rod, also can first pour into cylindric billet, then on extrusion machine, be squeezed into thin rod, after cutting scale, use as extrusion anode rod.
Aluminium alloy sacrificial anode material in embodiment 1-6 is carried out to following test and application experiment:
1, with reference to ASTM G97-97 (changing) experimental standard, standardized solution is replaced by ordinary tap water, the chemical property of the sacrificial aluminium alloy anode of preparing in test above-described embodiment 1-6: in embodiment 1-3, the current efficiency mean value of sample is 69.7%, and actual capacitance mean value is 2.09A.h/g; In embodiment 4-6, the current efficiency mean value of sample is 70.3%, and actual capacitance mean value is 2.12A.h/g.Above performance perameter, compared with existing sacrificial aluminium alloy anode, all improves more than 30%.Therefore, sacrificial aluminium alloy anode of the present invention has improved the current efficiency of sacrificial anode., can there is uniform corrosion in sacrificial aluminium alloy anode of the present invention not passivation in tap water, current efficiency >=50%, and actual capacitance >=1.5A.h/g, more existing sacrificial anode improves more than 30%.
2, with reference to ASTM G97-97 (changing) experimental standard, standardized solution is replaced by ordinary tap water, the chemical property of the sacrificial aluminium alloy anode of preparing in test above-described embodiment 1-6: in embodiment 1-3, the open circuit potential mean value of sample is-1.20V; In embodiment 4-6, the open circuit potential mean value of sample is-1.26V.Aluminum anode of the present invention has more negative open circuit potential, can in the different water surroundings of high resistivity and low-resistivity, normally use, stronger than the versatility of general sacrificial anode and practicality.Open circuit potential in tap water is more negative, activity is higher.
3, carry out corrosion simulation experiment in laboratory, the sacrificial aluminium alloy anode of preparing in above-described embodiment 1-6 soaked after 90 days in tap water, did not observe Heisui River and black slag, did not also smell obvious stink, did not affect water quality.Corrosion product is white cotton-shaped aluminium hydroxide, can also play certain prevention incrustation scale and pile up the effect covering at anode barred body, is conducive to the homogeneity corrosion of anode body.Solve the problem of sacrificial anode lysate polluted water.
4, adopt the erosion rate of aluminum alloy anode in normal temperature tap water in weight-loss method test above-described embodiment 1-6: the average corrosion speed of sacrificial aluminium alloy anode of the present invention is 0.056mm/a, and other two groups of average corrosion rates that participate in the aluminum anode of simultaneous test are 0.066mm/a and 0.075mm/a, slower erosion rate can ensure that anode bar has longer work-ing life.By the inner grain structure that added beneficial element refinement, can there is not coming off of bulk crystal grain in sacrificial anode of the present invention, extended the work-ing life of sacrificial anode in corrosion dissolution process.
Polynary aluminum alloy materials of the present invention, has solved current sacrificial anode material driving voltage deficiency, current efficiency is on the low side, lysate polluted water and the shorter series of problems of service life.
Two kinds of preferred aluminium alloy sacrificial anode material preparing in above-described embodiment all can be used for the galvanic protection under tap water environment below 70 DEG C of all kinds of displacement type water heater metal inner tubes.Preferred alloy composition in embodiment 1-3 is more suitable for poor environment and the area of water quality from the beginning, and preferred alloy composition in embodiment 4-6 is more suitable for the good environment of water quality and area from the beginning.
Claims (4)
1. a displacement type water heater sacrificial aluminium alloy anode, its main component is: taking aluminium as raw material, add element zinc, it is characterized in that: also add element tin and boron, the weight content of described element zinc is 3～8%, the weight content of described element tin is 0.05～0.3%, and the weight content of described element boron is 0.02～0.09%.
2. displacement type water heater sacrificial aluminium alloy anode according to claim 1, is characterized in that: also add element bismuth.
3. displacement type water heater sacrificial aluminium alloy anode according to claim 2, is characterized in that: the weight content of described element bismuth is 0～0.12%.
4. displacement type water heater sacrificial aluminium alloy anode according to claim 1, is characterized in that: also contain impurity, the weight content of described impurity is Fe≤0.25%, Si≤0.25%, other impurity gross weight≤0.15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110174591.0A CN102851670B (en) | 2011-06-27 | 2011-06-27 | Aluminum alloy sacrificial anode for volumetric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110174591.0A CN102851670B (en) | 2011-06-27 | 2011-06-27 | Aluminum alloy sacrificial anode for volumetric water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102851670A CN102851670A (en) | 2013-01-02 |
| CN102851670B true CN102851670B (en) | 2014-08-13 |
Family
ID=47398632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110174591.0A Active CN102851670B (en) | 2011-06-27 | 2011-06-27 | Aluminum alloy sacrificial anode for volumetric water heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102851670B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105463473B (en) * | 2015-12-29 | 2020-08-21 | 厦门火炬特种金属材料有限公司 | Aluminum alloy sacrificial anode for water storage type water heater |
| CN107523721A (en) * | 2017-05-08 | 2017-12-29 | 赵永韬 | A kind of heat exchanger water-cooling system aluminum alloy anode and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0668364A1 (en) * | 1994-02-16 | 1995-08-23 | Corrpro Companies, Inc. | Sacrificial anode for cathodic protection and alloy therefor |
| CN101586241A (en) * | 2009-06-20 | 2009-11-25 | 戴明安 | Aluminum zinc series alloy sacrificial anode for electric water heaters |
-
2011
- 2011-06-27 CN CN201110174591.0A patent/CN102851670B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0668364A1 (en) * | 1994-02-16 | 1995-08-23 | Corrpro Companies, Inc. | Sacrificial anode for cathodic protection and alloy therefor |
| CN101586241A (en) * | 2009-06-20 | 2009-11-25 | 戴明安 | Aluminum zinc series alloy sacrificial anode for electric water heaters |
Non-Patent Citations (2)
| Title |
|---|
| 侯德龙等.铝基牺牲阳极材料的研究与开发.《稀有金属》.2009,第33卷(第1期),第96-100页. |
| 铝基牺牲阳极材料的研究与开发;侯德龙等;《稀有金属》;20090228;第33卷(第1期);第96-100页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102851670A (en) | 2013-01-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Xiong et al. | Effects of microstructure on the electrochemical discharge behavior of Mg-6wt% Al-1wt% Sn alloy as anode for Mg-air primary battery | |
| Shi et al. | Microstructure and electrochemical corrosion behavior of extruded Mg–Al–Pb–La alloy as anode for seawater-activated battery | |
| Ma et al. | Electrochemical polarization and corrosion behavior of Al–Zn–In based alloy in acidity and alkalinity solutions | |
| CN105671557B (en) | A kind of magnesium alloy sacrificial anode material containing Bi | |
| Cai et al. | Effects of Zn on microstructure, mechanical properties and corrosion behavior of Mg–Zn alloys | |
| Song et al. | Effect of second phases on the corrosion behaviour of wrought Mg–Zn–Y–Zr alloy | |
| Sun et al. | The performance of Al–Zn–In–Mg–Ti sacrificial anode in simulated deep water environment | |
| CN105734375B (en) | A kind of magnesium alloy sacrificial anode material containing Sb | |
| CN105695826B (en) | A kind of magnesium-alloy anode material and preparation method thereof | |
| CN104862710B (en) | A kind of environmentally friendly sacrificial zinc alloy anode | |
| CN101586241B (en) | Aluminum zinc series alloy sacrificial anode for electric water heaters | |
| CN102808122A (en) | Process for manufacturing magnesium alloy sacrificial anode bar | |
| CN105803465B (en) | A kind of magnesium alloy sacrificial anode material containing Sm | |
| CN105779837A (en) | Gd containing sacrificial anode magnesium alloy | |
| CN106555090A (en) | Seawater pipeline large-scale electronegative potential magnesium alloy sacrificial anode material and preparation method thereof | |
| CN102851670B (en) | Aluminum alloy sacrificial anode for volumetric water heater | |
| CN101445936B (en) | Low-driving potential aluminum alloy sacrificial anode | |
| CN105463473A (en) | Aluminum alloy sacrificial anode used for water storage type water heater | |
| CN100432294C (en) | High petential magnesium alloy sacrificial anode material and its manufacturing method | |
| Chen et al. | Formation of hydrogen blister on AZ91 magnesium alloy during cathodic charging | |
| CN103088347B (en) | Aluminum alloy sacrificial anode material for storage tank coil and preparation method thereof | |
| CN102925902A (en) | Method for controlling electrochemical performance of aluminum anode with high iron tramp content | |
| CN107142483A (en) | A kind of complex magnesium alloy sacrificial anode material containing Sm and preparation method thereof | |
| Liu et al. | Effect of Heat Treatment on Corrosion and Mechanical Properties of Mg-10Y-1.5 Zn-0.5 Zr Alloy | |
| CN105063443A (en) | Heat treatment method of aluminum alloy sacrificial anode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150916 Address after: 361100 327 Torch Road, Xiamen torch hi tech Zone, Huli District, Fujian, Xiamen Patentee after: Xiamen Torch SpecialMetals Materials Co.,Ltd Address before: 100088 Beijing city Xicheng District Xinjiekou Avenue No. 2 Patentee before: General Research Institute for Nonferrous Metals |