CN100457975C - Double layer aluminum alloy composite sacrificial anode - Google Patents
Double layer aluminum alloy composite sacrificial anode Download PDFInfo
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- CN100457975C CN100457975C CNB2006100459925A CN200610045992A CN100457975C CN 100457975 C CN100457975 C CN 100457975C CN B2006100459925 A CNB2006100459925 A CN B2006100459925A CN 200610045992 A CN200610045992 A CN 200610045992A CN 100457975 C CN100457975 C CN 100457975C
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Abstract
This invention relates to a double layer Al alloy compound sacrificial anode composed of two kinds of Al-base sacrificial anode materials, in which, the components of the outer layer in weight proportion are: Zn 2.5-3.5%, Ga 0.05-0.20%, In 0.01-0.05%, Sn 0.01-0.03%, Bi 0.005-0.05% and Al, the components of the internal layer include: Zn 2.5-7.0%, In 0.018-0.05%, Cd 0-0.02%, Sn 0-0.075%, Mg 0-1.5%, Si 0-0.15%, Ti 0-0.08% and Al, which utilizes the advantages of the two kinds of Al anodes to use the outer Al anode to provide larger protection current at the beginning to polarize the steel structure swiftly and generate a surface deposition layer quickly so as to reduce the current desity necessary for stable polarization, after the consumption, the internal anode can protect the steel structure under rather small current.
Description
Technical field
The present invention relates to the improvement technology of composite sacrificial anode, be specially a kind of double layer aluminum alloy composite sacrificial anode, be applicable to the galvanic protection of large ocean steel construction such as harbour, harbour and ocean platform.
Background of invention
When carrying out cathodic Protection Design, protective current density is unusual important parameters, and the required protective current density of different times steel construction differs greatly.In general, when steel construction just descends water, the initial stage that promptly polarizes, required protective current density is bigger, and after the initial stage, the required protective current density of steel construction will reduce greatly.Initial stage required protective current density design load is generally the twice of average protective current density design load in the actual marine engineering design.Though the polarization initial stage is very short with respect to the work-ing life of whole steel construction during this period of time, but it is very significant for the work-ing life of steel construction and the influence of preservative effect, therefore, must pay much attention to this problem in the actual ocean steel construction antiseptic project design, just can guarantee protection effect, guarantee the normal use of steel construction.
Traditional sacrificial anode material; limited as al base sacrificial anode and zinc-base anode owing to driving current potential; be difficult to the protective current that provides enough big in the early stage; must rely on increase anode quantity to remedy; and after the polarization stage at initial stage; required protective current density reduces greatly, at this situation by the planner propose that series resistance reaches the adjusting initial stage polarization purpose of protective current density afterwards in the loop that sacrificial anode and protected steel structure body are formed.The drawback of doing like this be a large amount of sacrificial anode materials polarization just after date do not bring into play provide protection, but the resistance consumption of being contacted has fallen.The large ocean steel construction, for example the sacrificial anode consumption of a large ocean platform is tens tons even up to a hundred tons easily, so this waste is very surprising.On the other hand, platform is stayed in the wide seawater, is not subjected to the erosion of seawater all the time, therefore, the load to platform when design has strict requirement, and too much uses sacrificial anode to cause the platform load increase, influence the stability of platform, become the potential potential safety hazard.
Composite sacrificial anode is a kind of new technology that development in recent years is got up; compare with traditional sacrificial anode material (what use always in the ocean environment is aluminium base sacrificial anode and zinc-base sacrificial anode), it has remarkable advantages in the galvanic protection that solves the medium-and-large-sized steel construction of ocean environment.Composite sacrificial anode, as its name suggests, the sacrificial anode that combines and make by two or more different sacrificial anode material exactly.At present, its skin of the composite sacrificial anode that uses in the ocean environment is magnesium alloy, and it is bigger to drive current potential, can provide bigger protective current to make the iron structure rapid polarization at the polarization initial stage, reaches guard mode.After treating that outer magnesium anode all dissolves consumption, drive the lower but unlined aluminium alloy anode that current efficiency is high of current potential and start working, make protective current density adjust to lower level, thereby keep long-term, the stable polarization of steel construction, realize the purpose of corrosionproof protection.Through the test of laboratory simulationt test and the actual installation on platform, confirm that this composite sacrificial anode has that protection is effective, long service life and save advantage such as anode material significantly.
Yet well-known, there is following shortcoming in magnesium alloy anode aspect production and the use:
Therefore 1, magnesium alloy is inflammable, must adopt fused salt and sulphur powder to protect in melting and casting cycle respectively, produces and the manufacturing process more complicated, and contaminate environment, is unfavorable for operator's health.
2. the electrical capacity of magnesium alloy anode is little, current efficiency is low, and market value also is higher than al base sacrificial anode, and therefore on use cost, magnesium alloy anode does not have advantage to say yet.
Given this, be necessary from the selection of cladding material, composite sacrificial anode to be improved.
Summary of the invention
The invention provides a kind of double layer aluminum alloy composite sacrificial anode; on the basis of summing up the composite sacrificial anode prior art; selected the skin of aluminum alloy anode for use as composite anode; make full use of the characteristics of two kinds of aluminum anodes, had advantages such as protection is effective, long service life, saving anode material.
Technical scheme of the present invention is:
A kind of double layer aluminum alloy composite sacrificial anode, be composited by inside and outside two kinds of different aluminium base sacrificial anode materials, the outer al alloy component of sacrificial anode of the present invention is (by weight percentage): zinc 2.5～3.5%, gallium 0.05～0.20%, indium 0.01～0.05%, tin 0.01～0.03%, bismuth 0.005～0.05%, surplus is an aluminium; Unlined aluminium anodic composition is (by weight percentage) among the present invention: zinc 2.5～7.0%, and indium 0.018～0.05%, cadmium 0～0.02%, tin 0～0.075%, magnesium 0～1.5%, silicon 0～0.15%, titanium 0～0.08%, surplus is an aluminium.
By weight percentage, the preferable outer composition of layer of composite sacrificial anode of the present invention is: zinc 3.0%, and gallium 0.10%, indium 0.022%, tin 0.012%, bismuth 0.01%, surplus is an aluminium; Preferable interior composition of layer is: zinc 4.0%, and magnesium 1.0%, indium 0.022%, tin 0.02%, titanium 0.02%, surplus is an aluminium.
Compared with prior art, the present invention has following advantage:
1, the inside and outside two-layer aluminium alloy that is of the present invention, but composition, performance and effect are different.
2, the operating potential of outer sacrificial aluminium alloy anode in natural sea-water be-1.40--1.45V about, the operating potential that approaches the ordinary magnesium alloy sacrificial anode is (1.45--1.55V).
3, ectonexine all adopts same body material-aluminium alloy, make produce and manufacturing process simpler, and select for use magnesium alloy to compare with skin more to help saving cost.
4, the present invention has made full use of the advantage of two kinds of aluminum anodes: the protection initial stage utilizes outer aluminum anode that bigger protective current is provided, and steel construction is polarized rapidly, generates the surface deposition layer fast, makes it the back and keeps the required current density of stable polarization to reduce greatly; After outer the consumption; the unlined aluminium anode can be protected steel construction under less protective current; give full play to the characteristics of internal layer anodic current efficiency height, long service life; therefore have advantages such as protection is effective, long service life, saving anode material, the corrosionproof protection of the medium-and-large-sized steel construction facility of particularly suitable Yu Haiyang.
Description of drawings
Fig. 1 is a double layer aluminum alloy composite sacrificial anode structural representation of the present invention.Among the figure: the outer sacrificial aluminium alloy anode of 1-; 2-internal layer sacrificial aluminium alloy anode; The 3-iron core.
Embodiment
Stipulate the outer aluminum anode and the unlined aluminium anode of composite sacrificial anode sample have been carried out electrochemical property test respectively according to GB/T17848-1999.Its mesectoderm composition is (by weight percentage): zinc 3.0%, and gallium 0.10%, indium 0.022%, tin 0.012%, bismuth 0.01%, surplus is an aluminium; Interior composition of layer is (by weight percentage): zinc 4.0%, and magnesium 1.0%, indium 0.022%, tin 0.02%, titanium 0.02%, surplus is an aluminium.Test result is: outer aluminum anode operating potential is-1.40--1.45V that current efficiency is about 50%; Unlined aluminium anode potential operating potential is-1.08--1.10V that current efficiency is about 90%.Composite sacrificial anode of the present invention is composited by inside and outside two kinds of different aluminium base sacrificial anode materials, and ectonexine is combined closely by the method for heat casting.Use present embodiment that certain ocean platform is carried out cathodic Protection Design, design variable is as follows:
Platform surface is long-pending: 10000m
2
Life: 20 years
Seawater resistivity: ρ=20 Ω .cm
Initial stage protective current density value: 130mA/m
2
Average protective current density value: 65mA/m
2
Determine that by simulation test the polar time at initial stage is two months.
It is the trapezoid columnar structure that composite sacrificial anode adopts the cross section, and its size dimension is 2300 * (220+240) * 230mm (cylinder length 2300mm; Trapezoid cross section: upper base 220mm, the 240mm that goes to the bottom, high 230mm), the coating thickness of its mesectoderm aluminum alloy anode is 5mm, and middle iron core radius is 3mm.By calculating, the composite sacrificial anode of 133 above-mentioned specifications can make the steel construction surface reach 130mA/m in two months of polarization initial stage
2Initial stage protective current density.After the outer completely consumed, the unlined aluminium alloy anode can make the protective current density on steel construction surface be reduced to 65mA/m automatically
2Average protective current density.
If adopt traditional aluminium base sacrificial anode to design, as the aluminium-zinc-indium series sacrificial anode, its operating potential is-1.10V, current efficiency 90%, and size dimension is similarly 2300 * (220+240) * 230mm, and middle iron core radius is 3mm.For reaching initial stage protective current density 130mA/m
2, 234 al base sacrificial anodes then must be installed just can meet the demands, and according to average protective current density 65mA/m
2Calculate, platform only needs the sacrificial anode of 133 above-mentioned specifications just can reach the protection purpose in the life in 20 years; this means that closely the anode of half does not play a role at the polarization initial stage later; but consumed in vain by series resistance, therefore, the waste of anode material is very serious.
This shows, adopt the present invention that the consumption of traditional aluminium base anode material in the ocean steel construction cathodic protection engineering is reduced greatly, can reach about 40%, application prospect is boundless.
By weight percentage, the outer al alloy component of described sacrificial anode is: zinc 3.5%, and gallium 0.18%, indium 0.022%, tin 0.01%, bismuth 0.03%, surplus is an aluminium; The unlined aluminium alloying constituent of described sacrificial anode is: zinc 3.0%, and indium 0.02%, cadmium 0.02%, tin 0.015%, magnesium 0.80%, silicon 0.08%, titanium 0.04%, surplus is an aluminium.
By weight percentage, the outer al alloy component of described sacrificial anode is: zinc 2.5%, and gallium 0.06%, indium 0.045%, tin 0.03%, bismuth 0.01%, surplus is an aluminium; The unlined aluminium alloying constituent of described sacrificial anode is: zinc 5.5%, and indium 0.04%, cadmium 0.01%, silicon 0.05%, surplus is an aluminium.
Show that by above-mentioned test the present invention has made full use of the characteristics of two kinds of aluminum anodes, have advantages such as protection is effective, long service life, saving anode material.
Claims (2)
1, a kind of double layer aluminum alloy composite sacrificial anode, it is characterized in that: be composited by inside and outside two kinds of different aluminium base sacrificial anode materials, by weight percentage, the outer al alloy component of described sacrificial anode is: zinc 2.5～3.5%, gallium 0.05～0.20%, indium 0.01～0.05%, tin 0.01～0.03%, bismuth 0.005～0.05%, surplus are aluminium; The unlined aluminium alloying constituent of described sacrificial anode is: zinc 2.5～7.0%, and indium 0.018～0.05%, cadmium 0～0.02%, tin 0～0.075%, magnesium 0～1.5%, silicon 0～0.15%, titanium 0～0.08%, surplus is an aluminium.
2, according to the described double layer aluminum alloy composite sacrificial anode of claim 1, it is characterized in that: by weight percentage, described composite sacrificial anode composition, skin is: zinc 3.0%, gallium 0.10%, indium 0.022%, tin 0.012%, bismuth 0.01%, surplus is an aluminium; Interior composition of layer is: zinc 4.0%, and magnesium 1.0%, indium 0.022%, tin 0.02%, titanium 0.02%, surplus is an aluminium.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002715A (en) * | 2010-10-12 | 2011-04-06 | 青岛双瑞防腐防污工程有限公司 | High-performance aluminium alloy sacrificial anode |
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| CN101775604A (en) * | 2010-03-05 | 2010-07-14 | 崔晓鹏 | Magnesium alloy composite sacrificial anode material 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 |
| 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 |
| KR101527144B1 (en) * | 2013-12-24 | 2015-06-10 | 주식회사 포스코 | Mg-al coated steel sheet and method for manufacturing the same |
| CN103774154B (en) * | 2014-01-15 | 2016-01-13 | 青岛双瑞海洋环境工程股份有限公司 | Be applicable to High Efficiency Aluminum Alloy Sacrificial Anode and the preparation technology thereof of low temperature seawater environment |
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| NO20160374A1 (en) * | 2016-03-03 | 2017-09-04 | Vetco Gray Scandinavia As | System and method for cathodic protection by distributed sacrificial anodes |
| CN105734588B (en) * | 2016-04-06 | 2018-06-12 | 北京科技大学 | A kind of abyssal environment high-performance aluminium alloy sacrificial anode and preparation method thereof |
| CN109855166B (en) * | 2018-12-12 | 2022-02-22 | 北京金旗舰暖通科技有限公司 | Anti-corrosion radiator |
| CN111797462B (en) * | 2020-06-02 | 2023-10-24 | 大连船舶重工集团有限公司 | Ship and ocean structure sacrificial anode dimension design method |
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