CN1827859A - Aluminium-magnesium sacrificed anode material - Google Patents
Aluminium-magnesium sacrificed anode material Download PDFInfo
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- CN1827859A CN1827859A CN 200610041961 CN200610041961A CN1827859A CN 1827859 A CN1827859 A CN 1827859A CN 200610041961 CN200610041961 CN 200610041961 CN 200610041961 A CN200610041961 A CN 200610041961A CN 1827859 A CN1827859 A CN 1827859A
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Abstract
The invention discloses an aluminium-magnesium sacrificed anode material, which comprises (by weight proportion) Mg 20-30%, impurity content <0.15%, and balancing Al. The material can also comprise (by weight percent) Mg 23-28%, In 0.02-0.06%, Sn 0.02-0.1%, impurity content <0.15%, and balancing Al.
Description
Technical field
The invention belongs to the metal corrosion and protection field, particularly a kind of aluminium alloy sacrificial anode material of protecting the steel structure corrosion under the briny environment and using.
Background technology
The sacrificial anode material that is widely used in the galvanic protection of steel construction facility at present has aluminum anode, zinc anode and magnesium anode.Sacrificial anode material performance and working conditions are required mainly to comprise: current potential will be born, but must be in reasonable range, and unit mass output electric weight is big, the current efficiency height, and dissolution evenness is good, and is cheap, nontoxic.
Aluminum anode is compared the superiority that himself is arranged with zinc anode, magnesium anode; but the easy passivation of fine aluminium; usually the method for employing alloying limits or stops the oxide film that forms successional protectiveness in its surface, impels surface active, makes alloy have negative current potential and higher current efficiency.
Developed and the aluminum anode of successful Application based on main activating element zinc, add other alloying element again and improve its performance, representational have Al-Zn-Hg to be, Al-Zn-In is that Al-Zn-Sn is an alloy, in actual applications, these anode materials part that also comes with some shortcomings.
Al-Zn-Hg be alloy mainly because of mercurous, toxicity is big, has banned use of this class anode both at home and abroad.Al-Zn-In is that alloy research is more, adds elementary composition multicomponent alloys such as Cd, Sn, Bi, Si, Mg, Ga on this basis again.But aluminum alloy anode still exists, and solvability is relatively poor, anodic polarization is serious, bigger from corrosion speed, shortcoming such as current efficiency is lower.In China's GB (GB/T4948-2002), a kind of use was external development originally extensively and effect aluminum anode Al-Zn-In-Cd alloy preferably, and domestic imitation uses.Wherein alloying element Cd is to promoting the anode uniform dissolution very effective, but Cd also is poisonous element, cadmium and contain the hazardous substance that cadmium material has been classified as contaminate environment at present both at home and abroad, and people constantly seek new substitute element again.Show that according to relevant medical information the cadmium infection can cause multiple disease even cause multiple organ pipe to damage.Domestic certain Battery Plant that also reported causes more than 50 workman to be subjected to the cadmium infection because of sfgd. is ineffective, judged reparations by court.The research worker is the basis with Al-Zn-In mainly at present, adds other yuan again and usually improves its performance.A kind of patent of invention Al-Sn-Bi is an anode material, only is applicable in the fresh water and uses.A kind of sodium chloride content is the anode material that uses in 1% the light salt brine, is added with Ga, Sn, Bi, Pb element, and wherein Ga also is poisonous element.These alloy current efficiency are low, are not suitable for using as sacrificial anode material in seawater.
Summary of the invention
The objective of the invention is to propose a kind of aluminium alloy sacrificial anode material that is applicable to the steel structure corrosion of using in the briny environment, this material efficiency height, toxicological harmless and economy.
For solving the problems of the technologies described above, the present invention is achieved in that this material component and content (weight %) comprising: Mg 20～30%, and impurity is less than 0.15%, and all the other are Al.
The present invention can also be made up of following:
Its component and content (weight %) are: Mg 23～28%, In 0.02-0.06%, and Sn0.02-0.1%, impurity is less than 0.15%, and all the other are Al.
The composition mentality of designing of aluminium-magnesium sacrificed anode material of the present invention is such.At first be the main element magnesium that adds, its content is 20～30%.Magnesium also is anode material, and current potential is very negative, and is very big to the driving voltage of iron, but current efficiency is very low.Added magnesium elements so that aluminium activatory research conclusion is in the past in aluminium: Mg content strengthens and can not make the aluminum anode activation, and control magnesium elements maximum level is 2～5% (are no more than 1.5% in actual the use, are used as auxiliary element usually in multicomponent alloy) in aluminum anode.Thinking can be along compound Mg between the crystal boundary precipitating metal when Mg content is big
2Al
3(it is Mg that document is arranged
5Al
8), in electrolyte solution, Mg
2Al
3Matrix α (Al) is the anode phase relatively, forms continuous passage at intergranular, thereby produces intergranular corrosion, and current efficiency descends, and the present invention adds 20～30% magnesium in fine aluminium, alloy structure is presented with intermetallic compound Mg
2Al
3Be main body, acted in a diametrically opposite way, make Mg with former theory
2Al
3Phase transformation is harmful in favourable.Under test conditions, along with Mg content is increased to 30% from 1%, the current potential of aluminium can be reduced to-1.19V by-0.76V, and activation effect is good.Intermetallic compound is owing on the microtexture, have stable performance as functional materials.Novel alloy combines the metallic aluminium of an easy passivation and another active excessive MAGNESIUM METAL, has prepared the sacrificial anode material that a kind of performance ideal has metallic compound constitutional features between magnalium.
In the Al-Mg alloy, organizing constituent is α (Al)+Mg
2Al
3, Mg
2Al
3The phase current potential negative (standard potential be-1.22V), and α (Al) be the negative electrode phase, potential difference between the two can cause little galvanic couple, and oneself corrodes.When Mg content was low, current potential was still negative inadequately.When Mg content was higher, open circuit potential had reached requirement, and operating potential is reduced to-0.90V about.Add activating element again, to improve over-all properties for this reason.On the one hand reduce polarizability, make the aluminum substrate activation on the other hand, it is close to reach between the inner each several part of alloy structure current potential, reduces from corrosion, realizes uniform dissolution.
Adding alloying element In by " dissolving-redeposition " mechanism, makes alloy surface keep active state, and constantly dissolving can make the aluminium surface corrosion be tending towards evenly, can also partly suppress the harmful effect of iron, and when adding In in the Al-Mg alloy, current potential is very stable after bearing and moving.
Alloying element Sn enters the aluminium surface film oxide in the stannic oxide mode, destroys its passivity, makes negative the moving of current potential of aluminium.
When In and Sn add in the Al-Mg binary alloy separately, all showed good matching effect, the aluminium current potential is born moved, but the effect of In has been better than Sn.Both add fashionable simultaneously, as add Sn again in Al-Mg-In, only make current potential slightly negative (about negative moving-0.02V), but that electrode potential of alloy reaches expected value is shorter transit time.
Mg content preferably is controlled at 23～28% in the multicomponent alloy, and the content low potential is negative inadequately, and the big alloy of content shows fragility, and In and Sn add in order to improve magnalium base performance, increases with Mg content and successively decreases.
When Mg content is higher, can add 0.01～0.5% antimony, can effectively reduce the fragility of high-magnesium aluminum alloy, in addition, antimony has the effect that prevents that the steel part bump from producing spark concurrently as the interpolation element of fire-fighting medium in alloy.But antimony also is the moderate toxicity element, can use according to the environment needs.
The chemical composition design of aluminium-magnesium sacrificed anode material of the present invention, outside having guaranteed chemical property, it is nontoxic to consider that also all add element, produces without special protection, free from environmental pollution in the use, also reasonable economically.The price of magnesium and aluminium is suitable, and China is former magnesium production and big export country, uses magnesium to enlarge use range and has also improved economic benefit, uses magnesium current efficiency low separately, behind the component alloy, has improved efficient.
The invention has the beneficial effects as follows:
Typical A l-Zn-In-Cd alloy ratio is summarized and is got up to have following advantage in aluminium-magnesium sacrificed anode material of the present invention and the GB.
1. designing and prepared a kind of is the novel aluminum alloy sacrificial anode material kind of main body activating element with the magnesium elements, and activation performance is good, reaches the zone of reasonableness of protection potential.
The novel aluminum alloy anode material organize constituent based on intermetallic compound, stable electrochemical property is utilized the characteristic property of intermetallic compound, makes Mg in the alloy
2Al
3By harmful become favourable.
3. compare with typical aluminum anode materials A l-Zn-In-Cd, behind the current efficiency height, particularly alloying, the current efficiency of magnesium is improved.
4. all alloying elements are nontoxic, and are without special protection, free from environmental pollution in the use in the production.
5. novel alloy is reasonable economically, and the main element magnesium resource that adds enriches, and has expanded the purposes of magnesium, and its price and aluminium are close.Trace element In, Sn do not surpass the usage quantity in the alloy commonly used, and Sn also is to abound with metal in China.
6. the anode material dissolving is even, and corrosion product easily comes off, and can also suitably regulate alloy ingredient according to the difference of environment for use, need not add new alloying element again.
Embodiment
Embodiment:
Composition range according to novel aluminum alloy anode material of the present invention, adopt the sacrificial anode electrochemical performance test method of stipulating among the GB/T4948-2002, medium is that synthetic sea water is tested, select wherein 3 groups with GB in anode material carry out the performance comparison test, table 1 is the new alloy chemical ingredients, and table 2 makes up golden chemical property detected result for each.The different-alloy current potential all has different variations in the test process, and current potential is the steady potential after 3 hours in medium in the table.The novel aluminum alloy anode material of sequence number 1,2,3 expression different chemical compositions, sequence number 4 is the Al-3%Zn-0.02%In-0.02%Cd sacrificial anode in the GB of preparation.
The novel aluminum alloy chemical ingredients (weight %) of table 1 different components
Table 2 heterogeneity anode material performance (medium is a synthetic sea water)
The manufacture method of novel aluminum alloy material of the present invention is with after the aluminium fusing, adds insulating covering agent, alloying element Mg, In, Sn is added in the aluminium liquid again.Stir direct ingot bar or casting forming after refining is slagged tap.
Claims (2)
1, a kind of briny environment aluminium-magnesium sacrificed anode material is characterized in that: this material component and content (weight %) comprising: Mg 20～30%, and impurity is less than 0.15%, and all the other are Al.
2, aluminium-magnesium sacrificed anode material according to claim 1 is characterized in that: its component and content are (weight %): Mg 23～28%, In 0.02-0.06%, and Sn 0.02-0.1%, impurity is less than 0.15%, and all the other are Al.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100419612A CN100432295C (en) | 2006-03-22 | 2006-03-22 | Aluminium-magnesium sacrificed anode material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100419612A CN100432295C (en) | 2006-03-22 | 2006-03-22 | Aluminium-magnesium sacrificed anode material |
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| CN1827859A true CN1827859A (en) | 2006-09-06 |
| CN100432295C CN100432295C (en) | 2008-11-12 |
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| CNB2006100419612A Expired - Fee Related CN100432295C (en) | 2006-03-22 | 2006-03-22 | Aluminium-magnesium sacrificed anode material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101665944B (en) * | 2008-09-05 | 2011-06-15 | 淄博宏泰防腐有限公司 | Mg-Mn-Ca-Zn-Sr sacrificial anode with high current efficiency |
| CN104046939A (en) * | 2014-06-25 | 2014-09-17 | 中国船舶重工集团公司第七二五研究所 | Preparation method of anticorrosive composite coating for LNG (liquefied natural gas) gasifier surface |
| CN105793463A (en) * | 2013-12-24 | 2016-07-20 | Posco公司 | Magnesium-aluminum coated steel sheet and manufacturing method therefor |
| CN114134507A (en) * | 2021-11-29 | 2022-03-04 | 牡丹江市新翔石油机械有限责任公司 | Magnesium alloy, sacrificial anode device and oil casing pipe potential corrosion prevention device thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5833308B2 (en) * | 1977-02-07 | 1983-07-19 | 株式会社日立製作所 | Anticorrosion |
| JPS6199684A (en) * | 1984-10-19 | 1986-05-17 | Hitachi Ltd | Corrosion preventive material |
| CN1247817C (en) * | 2003-08-29 | 2006-03-29 | 中国石油天然气股份有限公司 | Method of protecting corrosion proof pipeline joint internal wall using sacrificing anode |
-
2006
- 2006-03-22 CN CNB2006100419612A patent/CN100432295C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101665944B (en) * | 2008-09-05 | 2011-06-15 | 淄博宏泰防腐有限公司 | Mg-Mn-Ca-Zn-Sr sacrificial anode with high current efficiency |
| CN105793463A (en) * | 2013-12-24 | 2016-07-20 | Posco公司 | Magnesium-aluminum coated steel sheet and manufacturing method therefor |
| JP2017508865A (en) * | 2013-12-24 | 2017-03-30 | ポスコＰｏｓｃｏ | Magnesium-aluminum coated steel sheet and method for producing the same |
| US10106866B2 (en) | 2013-12-24 | 2018-10-23 | Posco | Magnesium-aluminum coated steel sheet |
| CN105793463B (en) * | 2013-12-24 | 2018-11-09 | Posco公司 | Magnalium coated steel sheet and its manufacturing method |
| CN104046939A (en) * | 2014-06-25 | 2014-09-17 | 中国船舶重工集团公司第七二五研究所 | Preparation method of anticorrosive composite coating for LNG (liquefied natural gas) gasifier surface |
| CN114134507A (en) * | 2021-11-29 | 2022-03-04 | 牡丹江市新翔石油机械有限责任公司 | Magnesium alloy, sacrificial anode device and oil casing pipe potential corrosion prevention device thereof |
| CN114134507B (en) * | 2021-11-29 | 2022-08-02 | 牡丹江市新翔石油机械有限责任公司 | Magnesium alloy, sacrificial anode device and oil casing pipe potential corrosion prevention device thereof |
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| Publication number | Publication date |
|---|---|
| CN100432295C (en) | 2008-11-12 |
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Granted publication date: 20081112 Termination date: 20110322 |