CN101445935A - Aluminum alloy sacrificial anode suitable for abyssal environment - Google Patents
Aluminum alloy sacrificial anode suitable for abyssal environment Download PDFInfo
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- CN101445935A CN101445935A CNA2008102496218A CN200810249621A CN101445935A CN 101445935 A CN101445935 A CN 101445935A CN A2008102496218 A CNA2008102496218 A CN A2008102496218A CN 200810249621 A CN200810249621 A CN 200810249621A CN 101445935 A CN101445935 A CN 101445935A
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Abstract
The invention relates to an aluminum alloy sacrificial anode suitable for an abyssal environment. The sacrificial anode comprises (wt%) the components as follows: zinc 2.0-5.5, indium 0.03-0.08, magnesium 0.5-2.0, titanium 0.05-0.2, gallium 0.05-0.55, manganese 0.02-1.2, impurities not higher than 0.30 (sum of ferrum, copper and nickel is not higher than 0.15, and the sum of silicon and calcium is not higher than 0.15), and A00 aluminum as a main raw material in balance. The sacrificial anode is manufactured by casting technique or other metallurgical means. The sacrificial anode has an operating potential in an abyssal environment of -1.05-(-1.10) V and current efficiency of higher than 90%; has the advantages of good activation property, uniform dissolution pattern, and reduced local corrosion and dissolution of aluminum alloy anode in the abyssal environment; and can be used for protecting the cathode of a metal structure in the abyssal environment.
Description
Technical field:
The present invention relates to a kind of sacrificial aluminium alloy anode that is suitable for galvanic protection under the deep-marine-environment, belong to Corrosion of Metallic Materials guard technology field in the ocean environment.
Background technology:
Ocean environment is a kind of corrosive environment of harshness, and the metallic structures of military service Yu Haiyang environment adopts the corrosion protection technology of galvanic protection usually.The galvanic anode protection method owing to easy for installation, safeguard that advantage such as simple is widely used in the corrosion protection of ocean environment works.The initial main sacrificial zinc alloy anode that adopts of sacrificial anode, along with the solution of aluminium alloy indium activating technology, sacrificial aluminium alloy anode is widely used in the galvanic anode protection technology of marine steel because of advantages such as extensive, the theoretical electrical capacity of its raw material sources are big.
Sacrificial anode in the present domestic deep-marine-environment mainly adopts aluminium-zinc-indium-cadmium and aluminium-zinc-indium-magnesium-titanium sacrificial anode, has not yet to see report about these anodes in the performance data under the deep-marine-environment.Evidence, existing commercial sacrificial anode are in deep-marine-environment, and conventional current efficiency descends 10～50%, and the current potential 50～150mV that shuffles dissolves inhomogeneously, and corrosion product does not come off sometimes.
The sixties in last century; the U.S. has carried out performance evaluation to the sacrificial anode under the deep-marine-environment; also find under the 200m deep-marine-environment; aluminium-zinc-indium-mercury sacrificial anode is sacrificed current efficiency and is reduced to 50%; under the 600m environment; sacrificial aluminium alloy anode efficient is reduced to 10%, can not satisfy the corrosion protection demand of deep-marine-environment metallic structures.For this reason, developed corresponding deep-sea sacrificial anode the nineties, its composition is Al-Zn (4.75～5.25%)-In (0.015～0.025%)-Si (＜0.1%).Japan has developed Al-Zn (0.15%)-Cd/Ca (0.03～0.20%)-Mn (＜0.15%)-Si (＜0.15%)-Mg (0.10%) at low temperature environment.The specific performance index is not appeared in the newspapers.
The at present domestic report of not seeing at the sacrificial anode material of degree of depth briny environment exploitation.
Summary of the invention:
The objective of the invention is to solve the current efficiency that existing commercial sacrificial anode exists and descend in deep-marine-environment, dissolve inhomogeneously, shortcomings such as operating potential instability provide a kind of sacrificial aluminium alloy anode that is suitable for galvanic protection under the deep-marine-environment.This sacrificial anode is by adjusting the kind and the content of microalloying element; make it under deep sea low temperature, hypoxemia, high pressure, have enough negative and stable operating potential, corrosion product comes off, dissolves that pattern is even, current efficiency is high, for the deep-marine-environment metallic structures provides good galvanic protection.
In order to realize the foregoing invention purpose, the sacrificial aluminium alloy anode that is suitable for the deep-sea galvanic protection of the present invention is with A
00Aluminium is main raw material, adds element zinc (Zn), indium (In), magnesium (Mg), titanium (Ti), gallium (Ga), manganese (Mn).The weight percent of each composition is as follows: zinc (zn) 2.0～5.5% (wt), indium (In) 0.03～0.08% (wt), magnesium (Mg) 0.5～2.0% (wt), titanium (Ti) 0.05～0.2% (wt), gallium (Ga) 0.05～0.55% (wt), manganese (Mn) 0.02～1.2% (wt).Total impurities Wei ≦ 0.30% (wt), wherein, detrimental impurity iron+copper+Nie ≦ 0.15% (wt), silicon+Gai ≦ 0.15% (wt), surplus is an aluminium.
This sacrificial anode can adopt the casting technique manufacturing, and manufacturing process is: at first aluminium ingot is added molten aluminium stove fusing, will melt at whole aluminium ingots and add zinc when finishing, indium, magnesium, titanium, gallium, materials such as manganese, stir with graphite rod or whipping appts, remove the impurity such as oxidation sludge on aluminium liquid surface then, get final product tapping casting, casting cycle must treat that the complete cooled and solidified of aluminium liquid gets final product continuously.This sacrificial anode also can adopt other metallurgical means manufacturing.
The present invention is by the suitable microalloying element of control, the aluminium alloy sacrificial anode material of preparation, through adopting GB17859-1999 sacrificial anode electrochemical performance testing standard at 4 ℃, electrochemical property test in the 4ppm dissolved oxygen seawater, anode is at low temperature, hypoxemia, chemical property under the hyperbaric environment is improved significantly, under the deep sea low temperature environment operating potential be-1.05～-1.10V, current efficiency is greater than 90%, has good activation performance, corrosion product comes off, the dissolving pattern is even, reduces the local corrosion dissolving of aluminum alloy anode under the deep sea low temperature environment.
Embodiment:
Embodiment 1:
With A
00Aluminium is main raw material, adds each micro-weight percent to be: zinc 2% (wt), indium 0.03%, magnesium 2%, titanium 0.20%, gallium 0.55%, manganese 1.20%.Total impurities Wei ≦ 0.30% (wt), wherein, other impurity iron+copper+Nie ≦ 0.15% (wt), silicon+Gai ≦ 0.15% (wt), surplus is an aluminium.The employing casting technique is made: at first aluminium ingot is added molten aluminium stove fusing, will melt at whole aluminium ingots and to add zinc, indium, magnesium when finishing, titanium, gallium, materials such as manganese stir with graphite rod or whipping appts, remove the impurity such as oxidation sludge on aluminium liquid surface then, get final product tapping casting, casting cycle must treat that the complete cooled and solidified of aluminium liquid gets final product continuously.With reference to GB/T 17859-1999 sacrificial anode electrochemical performance testing standard, test result in 4 ℃, the seawater of 4ppm dissolved oxygen is: open circuit potential is-1.051～-1.065V (vs.Ag/AgCl reference electrode, down together), operating potential is-1.040～-1.049V, current efficiency is 91.8%, dissolving is even, and corrosion product comes off; This sacrificial anode is processed into the column of Φ 13 * 40mm, carry out the extra large performance test of reality of 800 meters depth of waters in testing station, deep-sea, marine site, the South Sea, test result be open circuit potential be-1.035～-1.053V, operating potential is-1.037～-1.047V, current efficiency is 90.8%, dissolving is even, and corrosion product comes off.
Embodiment 2:
With A
00Aluminium is main raw material, adds each micro-weight percent to be: zinc 4% (wt), indium 0.05%, magnesium 1.5%, titanium 0.10%, gallium 0.30%, manganese 0.02%.Total impurities Wei ≦ 0.30% (wt), wherein, other impurity iron+copper+Nie ≦ 0.15% (wt), silicon+Gai ≦ 0.15% (wt), surplus is an aluminium.Adopt the method for melting to make product of the present invention.With reference to GB/T 17859-1999 sacrificial anode electrochemical performance testing standard, test result in 4 ℃, the seawater of 4ppm dissolved oxygen is: open circuit potential is-1.093～-1.095V (vs.Ag/AgCl reference electrode, down together), operating potential is-1.062～-1.072V, current efficiency is 93%, dissolving is even, and corrosion product comes off; This sacrificial anode is processed into the column of Φ 13 * 40mm, carry out the extra large performance test of reality of 800 meters depth of waters in testing station, deep-sea, marine site, the South Sea, test result be open circuit potential be-1.065～-1.088V, operating potential is-1.055～-1.065V, current efficiency is 90.2%, dissolving is even, and corrosion product comes off.
Embodiment 3:
With A
00Aluminium is main raw material, adds each micro-weight percent to be: zinc 5.5% (wt), indium 0.08%, magnesium 0.5%, titanium 0.05%, gallium 0.05%, manganese 0.50%.Total impurities Wei ≦ 0.30% (wt), wherein, other impurity iron+copper+Nie ≦ 0.15% (wt), silicon+Gai ≦ 0.15% (wt), surplus is an aluminium.Adopt the method for melting to make product of the present invention.With reference to GB/T 17859-1999 sacrificial anode electrochemical performance testing standard, test result in 4 ℃, the seawater of 4ppm dissolved oxygen is: open circuit potential is-1.102～-1.113V (vs.Ag/AgCl reference electrode, down together), operating potential is-1.095～-1.106V, current efficiency is 92.4%, dissolving is even, and corrosion product comes off; This sacrificial anode is processed into the column of Φ 13 * 40mm, carry out the extra large performance test of reality of 800 meters depth of waters in testing station, deep-sea, marine site, the South Sea, test result be open circuit potential be-1.085～-1.096V, operating potential is-1.077～-1.089V, current efficiency is 90.3%, dissolving is even, and corrosion product comes off.
Claims (3)
1, a kind of sacrificial aluminium alloy anode that is suitable for deep-marine-environment is characterized in that with A
00Aluminium is main raw material, adds element zinc, indium, magnesium, titanium, gallium, manganese, the weight percent of each composition is as follows: zinc 2.0～5.5%, indium 0.03～0.08%, magnesium 0.5～2.0%, titanium 0.05～0.2%, gallium 0.05～0.55%, manganese 0.02～1.2%, total impurities Wei ≦ 0.30%, wherein, impurity iron+copper+Nie ≦ 0.15%, silicon+Gai ≦ 0.15%, surplus is an aluminium.
2, a kind of sacrificial aluminium alloy anode that is suitable for deep-marine-environment according to claim 1 is characterized in that this sacrificial anode adopts casting technique or other metallurgical means manufacturing.
3, a kind of sacrificial aluminium alloy anode that is suitable for deep-marine-environment according to claim 1, it is characterized in that this anode operating potential under the deep sea low temperature environment be-1.05～-1.10V, current efficiency is greater than 90%, corrosion product comes off, the dissolving pattern is even.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619459B (en) * | 2009-08-11 | 2011-06-22 | 山东德瑞防腐材料有限公司 | Sacrificial anode capable of quickly activating aluminum alloy |
| CN102605376A (en) * | 2011-05-27 | 2012-07-25 | 中国石油化工股份有限公司 | Sacrificial anode material |
| CN104805448A (en) * | 2015-05-06 | 2015-07-29 | 青岛钢研纳克检测防护技术有限公司 | Electric protector for injection well oil tube and preparation method thereof |
| CN106350824A (en) * | 2015-07-16 | 2017-01-25 | 东北大学 | Efficient aluminum alloy sacrificial anode for deep sea, and producing method thereof |
| WO2017034486A1 (en) * | 2015-08-24 | 2017-03-02 | Ptt Public Company Limited | Aluminium alloy for sacrificial anode |
-
2008
- 2008-12-25 CN CNA2008102496218A patent/CN101445935A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619459B (en) * | 2009-08-11 | 2011-06-22 | 山东德瑞防腐材料有限公司 | Sacrificial anode capable of quickly activating aluminum alloy |
| CN102605376A (en) * | 2011-05-27 | 2012-07-25 | 中国石油化工股份有限公司 | Sacrificial anode material |
| CN104805448A (en) * | 2015-05-06 | 2015-07-29 | 青岛钢研纳克检测防护技术有限公司 | Electric protector for injection well oil tube and preparation method thereof |
| CN106350824A (en) * | 2015-07-16 | 2017-01-25 | 东北大学 | Efficient aluminum alloy sacrificial anode for deep sea, and producing method thereof |
| WO2017034486A1 (en) * | 2015-08-24 | 2017-03-02 | Ptt Public Company Limited | Aluminium alloy for sacrificial anode |
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