CN109097783A - A kind of oil well sacrificial aluminium alloy anode and preparation method thereof - Google Patents
A kind of oil well sacrificial aluminium alloy anode and preparation method thereof Download PDFInfo
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- CN109097783A CN109097783A CN201710476897.9A CN201710476897A CN109097783A CN 109097783 A CN109097783 A CN 109097783A CN 201710476897 A CN201710476897 A CN 201710476897A CN 109097783 A CN109097783 A CN 109097783A
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- oil well
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- aluminium alloy
- rare earth
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/12—Electrodes characterised by the material
- C23F13/14—Material for sacrificial anodes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
Abstract
The present invention relates to a kind of oil well sacrificial aluminium alloy anodes and preparation method thereof, belong to metal erosion protection technology field.Oil well sacrificial aluminium alloy anode of the invention, is composed of the following parts by weight: 90~95 parts of aluminium, 3~10 parts of zinc, 0.05~0.5 part of silicon, 0.001~0.01 part of rare earth, the rare earth is lanthanum, cerium, praseodymium, neodymium or in-between alloy.Preparation method of the invention is that aluminium is melt into molten aluminum in heating furnace, and zinc, silicon and rare earth element are added into above-mentioned molten aluminum, is stirred, slagging-off, direct pouring or die cast.Sacrificial aluminium alloy anode of the invention has good chemical property in oil well working environment; operating potential is 0.80V-1.20V; current efficiency is greater than 90%, can uniformly dissolve during work, the metal structure being effectively protected under oil well working environment.
Description
Technical field
The present invention relates to a kind of oil well sacrificial aluminium alloy anodes and preparation method thereof, belong to metal erosion guard technology neck
Domain.
Background technique
Corrosion is metal and a kind of destructive erosion caused by chemical reaction or electrochemical reaction occurs for ambient enviroment, more
In number situations, its metallic character can be lost after metal erosion, becomes certain compound, exists with form stable, using effectively arranging
All kinds of corrosion can be prevented or slowed down by applying.In anti-corrosion of metal technology, cathode protection method is a kind of important control technology, and cathode is protected
It defends the doctrine including galvanic anode protection method and impressed current cathode protection method, wherein galvanic anode protection method, which has, throws
Provide it is low, it is convenient for installation and maintenance the advantages that, be widely used in pipeline, hull, drilling platforms, the anti-corrosions such as mechanical equipment.
Currently, sacrificial anode material mainly has the big series of aluminium, magnesium, zinc three, Sacrificial Anode and magnesium-based, zinc-base sacrifice sun
Pole is compared, and has the advantage that specific gravity is small, the big (2980AhKg of electrochemical theory point capacity-1, it is 3.6 times of zinc, the 1.35 of magnesium
Times), driving current potential is high, and current efficiency is high, long using the time.Although bauxite resource is abundant, low in cost, the property of aluminium is active,
Strong with oxygen affinity, surface is readily formed stable dense oxidation film, reduces the current potential of aluminium in the solution, and corrosion product
It should not fall off, make the reduction of sacrificial anode efficiency, on the other hand, since the property of aluminium is active, once oxidation film destroys, have in water
Higher self-corrosion rate also makes the reduction of sacrificial anode efficiency, cannot protect so as to cause protected metal component, even
The serious consequence that current potential reverses and metal component is accelerated to corrode occurs.
In view of the above-mentioned problems, needing to add necessary alloying element into parent metal, change the configuration of surface of aluminium, promotes
Surface active changes anode polarization performance, and the element of these additions is generally termed active element, the side of this addition active element
Method is referred to as alloyage process, and currently used active element includes zinc, indium, tin, bismuth, is in addition to this additionally added a small amount of other
Active element, such as magnesium, calcium, barium, beryllium, silicon, manganese active element.
The main addition heavy metals such as mercury and cadmium of sacrificial aluminium alloy anode research of early stage are as active element, due to will lead to
The reasons such as environmental pollution and current efficiency and limit use.Currently, sacrificial aluminium alloy anode is mainly aluminium-zinc-indium (Al-
It Zn-In) is quaternary even quinary alloy.For example, 1566403 A of patent CN discloses a kind of sacrificial aluminium alloy sun for adding cerium
Pole, main component are as follows: Zn 2.50~5.2%, In 0.018~0.050%, Cd 0.005~0.020%, Mg 0.08~
0.15%, rare earth metal cerium 0.05~0.50%.Contain magnesium in this aluminium alloy formula, magnesium is also easy to produce Heisui River when dissolving, smelly water and
Particle obscission causes environmental pollution, and the content of indium is higher in alloy, high production cost, and complex process is complicated for operation, leads
Manufacturing cost is caused to greatly improve.
Summary of the invention
In view of the above problems and defect, the object of the present invention is to provide a kind of oil well sacrificial aluminium alloy anode, which is closed
Golden sacrificial anode has more negative operating potential, larger current density, and corrosion product is easy to fall off, and is applicable to oil exploitation process
The protection of middle metal structure.
It is another object of the present invention to provide a kind of preparation method of oil well sacrificial aluminium alloy anode, the preparation sides
Method simple process, it is easy to operate.
To achieve the goals above, oil well sacrificial aluminium alloy anode of the invention the technical solution adopted is as follows:
A kind of oil well sacrificial aluminium alloy anode, is composed of the following parts by weight: 90~95 parts of aluminium, zinc 3~10
Part, 0.05~0.5 part of silicon, 0.001~0.01 part of rare earth and inevitable impurity, the rare earth be rare-earth elements of lanthanum, cerium,
Praseodymium, neodymium or in-between alloy.
The intermediate alloy is the alloy of aluminium and one of lanthanum, cerium, praseodymium, four kinds of rare earth elements of neodymium or a variety of compositions, excellent
Choosing is the intermediate alloy that aluminium and cerium composition intermediate alloy and aluminium and four kinds of lanthanum, cerium, praseodymium, neodymium rare earth elements form.
The intermediate alloy of the aluminium and cerium composition is Al-20Ce, wherein 20 indicate the mass fraction of Ce in the alloy.
The aluminium is Al-20 (La, Ce, Pr, Nb) alloy with lanthanum, cerium, praseodymium, neodymium composition mischmetal intermediate alloy.Into
One step is preferred, and the weight ratio of La, Ce, Pr, Nd element is 2:15:2:1.
The technical solution of the preparation method of sacrificial aluminium alloy anode for oil well of the invention is as follows:
A kind of preparation method of oil well sacrificial aluminium alloy anode, specific steps are as follows: aluminium is melt into molten aluminum, to the aluminium
Zinc, silicon and rare earth, casting or die cast are added in liquid.
Zinc, silicon and the rare earth element is added in molten aluminum simultaneously.Specifically: aluminium being melt into molten aluminum, to the molten aluminum
Middle addition zinc, silicon and rare earth, mechanical stirring 5~10 minutes, peripheral speed was controlled in 1~8m/s, was skimmed using manipulator or mistake
Strainer filtering removes the gred, then casting or die cast.
The temperature of the aluminium melting is 660~760 DEG C.
Compared with prior art, the positive effect of the present invention is as follows:
Oil well of the invention sacrificial aluminium alloy anode has excellent chemical property, and operating potential is (- V/CSE)
0.88~1.10V, actual current efficiency can reach 90%, be more suitably applied to the guarantor under oilfield environment for steel material
Shield, surface is uniformly dissolved, and corrosion product can voluntarily fall off, and can be good at protecting in oil well metal structure from corrosion.
Oil well of the invention is to add different ratio into molten aluminum after dissolving aluminium ingot with aluminum alloy anode preparation method
Zn, Si and rare earth, and then founding, at Al-Zn-Si- rare earth aluminium alloy sacrificial anode, the sacrificial anode raw material is simple, makes work
Skill is simple, and program is less, easy to operate.
The present invention has current potential negative enough as the sacrificial anode material of oil well environment, and stablizes.
As being uniformly dissolved in the sacrificial anode material work of oil well environment, product can voluntarily fall off the present invention；Have higher
Current efficiency, corrosion product is nontoxic, free from environmental pollution.
Detailed description of the invention
Fig. 1 is the polarization curve of the sacrificial aluminium alloy anode of embodiment 1-6.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below.
Embodiment 1
The oil well of the present embodiment sacrificial aluminium alloy anode the preparation method comprises the following steps: 92kg aluminium is heated in heating furnace
660 DEG C are melt into molten aluminum, and zinc 8kg, silicon 0.5kg, lanthanum 0.001kg is added simultaneously into above-mentioned molten aluminum, stir, and slagging-off is cast into
Type to get.
Mass fraction shared by each component of the oil well sacrificial aluminium alloy anode of the present embodiment are as follows: 92 parts of aluminium, 8 parts of zinc, silicon
0.5 part, 0.001 part of lanthanum.
Embodiment 2
The oil well of the present embodiment sacrificial aluminium alloy anode the preparation method comprises the following steps: 90kg aluminium is heated in heating furnace
760 DEG C are melt into molten aluminum, and zinc 10kg, silicon 0.05kg, cerium 0.002kg is added simultaneously into above-mentioned molten aluminum, stir, and remove the gred, casting
Molding to get.
Mass fraction shared by each component of the oil well sacrificial aluminium alloy anode of the present embodiment are as follows: 90 parts of aluminium, 10 parts of zinc, silicon
0.05 part, 0.002 part of cerium.
Embodiment 3
The oil well of the present embodiment sacrificial aluminium alloy anode the preparation method comprises the following steps: 95kg aluminium is heated in heating furnace
700 DEG C are melt into molten aluminum, and zinc 5kg, silicon 0.5kg, praseodymium 0.004kg is added simultaneously into above-mentioned molten aluminum, stir, and slagging-off is cast into
Type to get.
Mass fraction shared by each component of the oil well sacrificial aluminium alloy anode of the present embodiment are as follows: 95 parts of aluminium, 5 parts of zinc, silicon
0.5 part, 0.004 part of praseodymium.
Embodiment 4
The oil well of the present embodiment sacrificial aluminium alloy anode the preparation method comprises the following steps: 91kg aluminium is heated in heating furnace
720 DEG C are melt into molten aluminum, and zinc 9kg, silicon 0.1kg, neodymium 0.005kg is added simultaneously into above-mentioned molten aluminum, stir, and slagging-off is cast into
Type to get.
Mass fraction shared by each component of the oil well sacrificial aluminium alloy anode of the present embodiment are as follows: 91 parts of aluminium, 9 parts of zinc, silicon
0.1 part, 0.005 part of neodymium.
Embodiment 5
The oil well of the present embodiment sacrificial aluminium alloy anode the preparation method comprises the following steps: 93kg aluminium is heated in heating furnace
700 DEG C are melt into molten aluminum, and zinc 7kg, silicon 0.3kg, Al-20Ce intermediate alloy 0.006kg is added simultaneously into above-mentioned molten aluminum., stir
Mix, remove the gred, cast molding to get.
Mass fraction shared by each component of the oil well sacrificial aluminium alloy anode of the present embodiment are as follows: 93 parts of aluminium, 7 parts of zinc, silicon
0.3 part, 0.006 part of Al-20Ce intermediate alloy.
Embodiment 6
The oil well of the present embodiment sacrificial aluminium alloy anode the preparation method comprises the following steps: 94kg aluminium is heated in heating furnace
720 DEG C are melt into molten aluminum, and zinc 6kg, silicon 0.4kg, Al-20 mischmetal intermediate alloy is added simultaneously into above-mentioned molten aluminum
0.01kg, stir, slagging-off, cast molding to get.
Mass fraction shared by each component of the oil well sacrificial aluminium alloy anode of the present embodiment are as follows: 94 parts of aluminium, 6 parts of zinc, silicon
0.4 part, 0.01 part of Al-20 mischmetal intermediate alloy.Wherein contain La, Ce, Pr, Nd element in rare earth intermediate alloy, it is each
Rare earth weight ratio is La:Ce:Pr:Nd=2:15:2:1.
Test example
Dependence test of the present invention experiment, to the sacrificial anode of embodiment 1-6 preparation according to GB/T 17848-1999 standard
Experimental method tests its chemical property.Anode is the cylindrical body of 16 × 48mm of Φ, and the work area of anode is 14cm2；Cathode
It is Φ 110 × 120mm stainless steel cylinder, effective area 829cm2；Test(ing) medium is 3.5%NaCl, and anodic current density is
1.0mA/cm2, test temperature is 30 DEG C.It is powered under the above conditions, the polarization of the sacrificial aluminium alloy anode of each embodiment
Curve is as shown in Figure 1, test result is as shown in table 1.
The sacrificial anode test result of 1 embodiment 1-6 of table
As shown in Table 1, sacrificial aluminium alloy anode of the invention is surveyed using the experimental method of GB/T 17848-1999 standard
Examination shows good electrochemical properties, and open circuit potential is 0.90~1.15V, and operating potential is 0.88~1.10V, real
Border capacitance is 2588.06~2613.05Ah/kg, and current efficiency is up to 91.8~92.9%.Sacrificial anode is molten in use process
Solution is uniform, erosion Automatic-falling.
Claims (6)
1. a kind of oil well sacrificial aluminium alloy anode, which is characterized in that be composed of the following parts by weight: aluminium 90~95
Part, 3~10 parts of zinc, 0.05~0.5 part of silicon, 0.001~0.01 part of rare earth and inevitable impurity；The rare earth be lanthanum, cerium,
Praseodymium, neodymium or in-between alloy.
2. oil well sacrificial aluminium alloy anode according to claim 1, which is characterized in that the intermediate alloy be lanthanum, cerium,
One of four kinds of praseodymium, neodymium rare earth elements or a variety of alloys with aluminium composition.
3. a kind of preparation method of oil well sacrificial aluminium alloy anode of any of claims 1 or 2, which is characterized in that specific step
Suddenly are as follows: aluminium is melt into molten aluminum, zinc, silicon and rare earth, casting or die cast are added into the molten aluminum.
4. the preparation method of oil well sacrificial aluminium alloy anode according to claim 3, which is characterized in that the zinc,
Silicon and rare earth are added in molten aluminum simultaneously.
5. the preparation method of oil well sacrificial aluminium alloy anode according to claim 3, which is characterized in that specific steps
Are as follows: aluminium is melt into molten aluminum, zinc, silicon and rare earth are added into the molten aluminum, mechanical stirring 5~10 minutes, peripheral speed controlled
In 1~8m/s, is skimmed using manipulator or filter screen filtration removes the gred, then casting or die cast.
6. the preparation method of oil well sacrificial aluminium alloy anode according to claim 3, which is characterized in that the temperature of aluminium melting
Degree is 660~760 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424281A (en) * | 2020-05-28 | 2020-07-17 | 西安石油大学 | Oil well pipe column anticorrosion sacrificial anode alloy, component design method, preparation method and application |
| CN113322467A (en) * | 2021-06-02 | 2021-08-31 | 青岛双瑞海洋环境工程股份有限公司 | Micro-zinc type aluminum alloy sacrificial anode |
| CN115747541A (en) * | 2022-10-25 | 2023-03-07 | 南通海门鑫瑞船舶配件有限公司 | Preparation method and application of aluminum alloy sacrificial anode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424281A (en) * | 2020-05-28 | 2020-07-17 | 西安石油大学 | Oil well pipe column anticorrosion sacrificial anode alloy, component design method, preparation method and application |
| CN111424281B (en) * | 2020-05-28 | 2022-03-25 | 西安石油大学 | Oil well pipe column anticorrosion sacrificial anode alloy, component design method, preparation method and application |
| CN113322467A (en) * | 2021-06-02 | 2021-08-31 | 青岛双瑞海洋环境工程股份有限公司 | Micro-zinc type aluminum alloy sacrificial anode |
| CN115747541A (en) * | 2022-10-25 | 2023-03-07 | 南通海门鑫瑞船舶配件有限公司 | Preparation method and application of aluminum alloy sacrificial anode |
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