CN114737193B - High-resistance Wen Xisheng anode and preparation method thereof - Google Patents
High-resistance Wen Xisheng anode and preparation method thereof Download PDFInfo
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- CN114737193B CN114737193B CN202110020778.9A CN202110020778A CN114737193B CN 114737193 B CN114737193 B CN 114737193B CN 202110020778 A CN202110020778 A CN 202110020778A CN 114737193 B CN114737193 B CN 114737193B
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- 238000002360 preparation method Methods 0.000 title description 5
- 239000011852 carbon nanoparticle Substances 0.000 claims abstract description 54
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000012535 impurity Substances 0.000 claims abstract description 27
- 239000011701 zinc Substances 0.000 claims abstract description 26
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 25
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000011777 magnesium Substances 0.000 claims abstract description 23
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 claims abstract description 22
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 22
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052776 Thorium Inorganic materials 0.000 claims abstract description 22
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 22
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 22
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 22
- 229910052738 indium Inorganic materials 0.000 claims abstract description 22
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 22
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 58
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 15
- 239000011574 phosphorus Substances 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 23
- 238000005260 corrosion Methods 0.000 abstract description 23
- 239000010405 anode material Substances 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 9
- 238000004090 dissolution Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 239000003921 oil Substances 0.000 description 6
- 229910001297 Zn alloy Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910007610 Zn—Sn Inorganic materials 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000007917 intracranial administration Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention discloses a high-temperature-resistant sacrificial anode, which comprises the following components in percentage by mass: 3-6% of zinc, 0.5-2% of carbon nano particles, 0.05-0.1% of indium, 0.1-0.2% of cadmium, 0.1-0.2% of manganese, 0.1-0.2% of magnesium, 0.16-0.35% of other elements and the balance of aluminum, wherein the other elements comprise the following components in percentage by mass: 0.08-0.12% of cerium, 0.01-0.02% of gallium, 0.01-0.015% of thorium and 0.06-0.1% of tin, and the balance of other elements is impurities. The carbon nano particles are added, and the current efficiency of the sacrificial anode material at high temperature is improved through the good conductive performance and the thermal stability of the carbon nano particles, so that the defect that the current efficiency of the sacrificial anode at high temperature is rapidly reduced is overcome, and the application temperature of the sacrificial anode is higher; meanwhile, the carbon nano particles are uniformly distributed in the sacrificial anode material, and as the carbon nano particles can be used as cathodes for receiving electrons in the corrosion process, the uniformly distributed carbon cathodes exist in the sacrificial anode, so that corrosion products are promoted to fall off, the dissolution performance of the corrosion products of the sacrificial anode is improved, and the protection effect of the sacrificial anode is improved.
Description
Technical Field
The invention relates to the technical field of oil pipe corrosion prevention, in particular to a high-resistance Wen Xisheng anode and a preparation method thereof.
Background
Tubing is one of the most important components in oilfield exploitation equipment, the corrosion problem of the tubing is long known, and the sacrificial anode protector is one of the commonly adopted measures for protecting a well bore string from corrosion, so that the corrosion prevention effectiveness of the tubing is undoubted. Currently, the sacrificial anodes of choice include primarily magnesium-, zinc-and aluminum-based alloy sacrificial anodes. In contrast, the aluminum-based alloy sacrificial anode has better electrochemical performance and physical performance in high-temperature annular protection liquid, so that the aluminum-based alloy sacrificial anode is selected in the environment. The existing aluminum alloy sacrificial anode materials comprise Al-Zn-Hg systems, al-Zn-Sn systems and Al-Zn-In systems.
The patent with publication number CN102605376B discloses a sacrificial anode material, which belongs to the technical field of metal corrosion and protection, and comprises the following components in proportion: zn4-7 (wt)%; in0.04-0.06 (wt)%; 0.06-0.08 wt% of SnO; mg0.9-1.1 (wt%; ce0.09-0.11 (wt)%; ga0.015-0.019 wt%; the balance being aluminum. But the current efficiency of the material is not stable, especially in high temperature environments.
Patent publication No. CN104372348A discloses a zinc alloy sacrificial anode material for the outer wall of a sleeve; the chemical composition of the zinc alloy anode sacrificial material is Zn-Al-Cd-Mn-Mg-In, and the weight percentage is 0.15-0.3% of Al, 0.1-0.2% of Cd, 0.1-0.2% of Mn, 0.1-0.2% of Mg, 0.05-0.15% of In, the balance being zinc, and the impurity content is less than or equal to 0.1%; the zinc alloy sacrificial anode material is subjected to electrochemical performance test at 20 ℃, the current efficiency is more than or equal to 90%, the anode is uniformly corroded, corrosion products are loose and automatically fall off, the electrochemical performance test is performed at a high temperature of 60 ℃, the current efficiency is more than or equal to 80%, the current efficiency can be reduced to 80%, and the zinc alloy sacrificial anode material is unstable at a high temperature.
The publication number CN110106509A discloses a high-efficiency zinc alloy sacrificial anode suitable for a high-temperature crude oil deposition water environment, which comprises the following components in percentage by weight: a10.10% -0.25%; 0.05% -0.15% of MgSO; 0.005% -0.009% of SnO; impurity content: pb is less than or equal to 0.006%; cd is less than or equal to 0.001%; cu is less than or equal to 0.001%; fe is less than or equal to 0.002%; the balance of Zn. The method comprises the steps of adopting a conventional casting method to manufacture, using a special graphite crucible Cheng Xinding, melting zinc ingots in a heating furnace, adding Al and Al-Mg alloy into molten zinc according to a certain proportion, stirring by using a graphite rod, deslagging, discharging from the furnace and casting; the heating furnace is selected from coke furnace, electric furnace, oil furnace, gas furnace, etc. However, the sacrificial anode is suitable for the exploitation environment of the sulfur gas field and has unsatisfactory effect.
The corrosion conditions of oil field oil-water well oil casings and downhole facilities are described in literature (Chen Xiuling, etc.), oil field oil-water well high temperature sacrificial anode protection technique [ J ], corrosion and protection, 2005, 26 (12): 524-526). Aiming at severe corrosion under high temperature conditions, the common corrosion inhibitor protection method has limitations, and a high temperature sacrificial anode cathode protection technology is provided, so that the problem of high temperature corrosion can be solved, but the problem about current efficiency is not excessively mentioned.
Therefore, how to provide a sacrificial anode which is resistant to high temperature, increases the current efficiency of the sacrificial anode at high temperature, promotes the falling of corrosion products and improves the protection effect of the sacrificial anode is an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention discloses a high-temperature-resistant sacrificial anode, which is characterized in that carbon nano particles are added into an aluminum-based alloy, so that the current efficiency of the sacrificial anode at a high temperature is increased, corrosion products are promoted to fall off, and the protection effect of the sacrificial anode is improved.
The specific technical scheme is as follows:
the high-temperature-resistant sacrificial anode comprises the following components in percentage by mass: 3-6% of zinc, 0.5-2% of carbon nano particles, 0.05-0.1% of indium, 0.1-0.2% of cadmium, 0.1-0.2% of manganese, 0.1-0.2% of magnesium, 0.16-0.35% of other elements and the balance of aluminum, wherein the other elements comprise the following components in percentage by mass: 0.08-0.12% cerium, 0.01-0.02% gallium, 0.01-0.015% thorium and 0.06-0.1% tin, the remainder of the other elements being impurities.
Preferably, the carbon nano-particles are carbon quantum dots or nitrogen-doped carbon quantum dots or phosphorus-doped carbon quantum dots.
Preferably, the carbon nanoparticles have a particle size of 2-5nm.
Preferably, the carbon nano particles are nitrogen-doped carbon quantum dots, and the mass fraction content of nitrogen in the nitrogen-doped carbon quantum dots is not less than 8%.
Preferably, the carbon nano particles are phosphorus doped carbon quantum dots, and the mass fraction content of phosphorus in the phosphorus doped carbon quantum dots is not less than 5%.
Preferably, the carbon nanoparticles are mesoporous carbon nanoparticles.
Preferably, the particle size of the mesoporous carbon nano particles is 50-100nm, and the mesopores of the mesoporous carbon nano particles are not more than 5nm.
Preferably, the mass fraction of the impurities is not more than 0.1%.
Preferably, the carbon nano particles are the carbon quantum dots, and comprise the following components in percentage by mass: 5% zinc, 1% carbon quantum dots, 0.08% indium, 0.15% cadmium, 0.17% manganese, 0.12% magnesium, 0.1% cerium, 0.015% gallium, 0.012% thorium, 0.08% tin, 0.07% impurities, and the balance aluminum.
Preferably, the composition comprises the following components in percentage by mass: 4.2% zinc, 1.2% mesoporous carbon nanoparticles, 0.07% indium, 0.15% cadmium, 0.14% manganese, 0.17% magnesium, 0.08% cerium, 0.015% gallium, 0.012% thorium, 0.06% tin, 0.07% impurities, and the balance aluminum.
The high-temperature-resistant sacrificial anode has the following technical effects:
carbon nano particles are added into the sacrificial anode material, and the current efficiency of the sacrificial anode material at high temperature is improved through the good conductive performance and the thermal stability of the carbon nano particles, so that the defect that the current efficiency of the sacrificial anode at high temperature is rapidly reduced is overcome, and the application temperature of the sacrificial anode is higher; meanwhile, the carbon nano particles are uniformly distributed in the sacrificial anode material, and as the carbon nano particles can be used as cathodes for receiving electrons in the corrosion process, the uniformly distributed carbon cathodes exist in the sacrificial anode, so that corrosion products are promoted to fall off, the dissolution performance of the corrosion products of the sacrificial anode is improved, and the protection effect of the sacrificial anode is improved.
Further, the carbon nano particles are carbon quantum dots or nitrogen doped carbon quantum dots or phosphorus doped carbon quantum dots, and nitrogen doping or phosphorus doping can cause forced micro-galvanic corrosion effect passivation, provide stable active dissolution current and improve the current efficiency of the anode material by at least 85%.
Further, the mass fraction content of nitrogen in the nitrogen-doped carbon quantum dots is not less than 8% or the mass fraction content of phosphorus in the phosphorus-doped carbon quantum dots is not less than 5%, so that the current efficiency can be ensured.
The invention also provides a preparation method of the high-temperature-resistant sacrificial anode, which comprises the following steps:
setting the temperature of a resistance furnace room at 450 ℃, placing aluminum into a furnace, heating to be completely melted, adding the carbon nano particles according to the content, adding other components into aluminum liquid according to the corresponding content, heating to 650 ℃ under the protection of inert gas, stirring to react, standing in the furnace for 10-30min, slagging off, draining by a carbon rod, pouring in a cast iron mold, and naturally cooling and solidifying to obtain the high-temperature-resistant sacrificial anode.
The preparation method is simple and has low cost.
Detailed Description
The invention provides a high-temperature-resistant sacrificial anode, which comprises the following components in percentage by mass: 3-6% of zinc, 0.5-2% of carbon nano particles, 0.05-0.1% of indium, 0.1-0.2% of cadmium, 0.1-0.2% of manganese, 0.1-0.2% of magnesium, 0.16-0.35% of other elements and the balance of aluminum, wherein the other elements comprise the following components in percentage by mass: 0.08-0.12% cerium, 0.01-0.02% gallium, 0.01-0.015% thorium and 0.06-0.1% tin, the remainder of the other elements being impurities.
Carbon nano particles are added into the sacrificial anode material, and the current efficiency of the sacrificial anode material at high temperature is improved through the good conductive performance and the thermal stability of the carbon nano particles, so that the defect that the current efficiency of the sacrificial anode at high temperature is rapidly reduced is overcome, and the application temperature of the sacrificial anode is higher; meanwhile, the carbon nano particles are uniformly distributed in the sacrificial anode material, and as the carbon nano particles can be used as cathodes for receiving electrons in the corrosion process, the uniformly distributed carbon cathodes exist in the sacrificial anode, so that corrosion products are promoted to fall off, the dissolution performance of the corrosion products of the sacrificial anode is improved, and the protection effect of the sacrificial anode is improved.
Wherein the carbon nano-particles are carbon quantum dots or nitrogen-doped carbon quantum dots or phosphorus-doped carbon quantum dots.
The nitrogen doping or the phosphorus doping can cause forced micro-galvanic corrosion effect to break passivation, provide stable active dissolution current and improve the current efficiency of the anode material by at least 85 percent.
Further, the particle diameter of the carbon nanoparticles is 2-5nm.
When the carbon nano particles are nitrogen-doped carbon quantum dots, the mass fraction content of nitrogen in the nitrogen-doped carbon quantum dots is not less than 8%; the carbon nano particles are phosphorus doped carbon quantum dots, and the mass fraction content of phosphorus in the phosphorus doped carbon quantum dots is not less than 5%.
The mass fraction content of nitrogen in the nitrogen-doped carbon quantum dots is not less than 8% or the mass fraction content of phosphorus in the phosphorus-doped carbon quantum dots is not less than 5%, so that the current efficiency can be ensured.
Or the carbon nano-particles are mesoporous carbon nano-particles, the particle size of the mesoporous carbon nano-particles is 50-100nm, and the mesopores of the mesoporous carbon nano-particles are not more than 5nm.
In addition, the mass fraction of impurities is not more than 0.1%.
Further, the carbon nano-particles are the carbon quantum dots, and comprise the following components in percentage by mass: 5% zinc, 1% carbon quantum dots, 0.08% indium, 0.15% cadmium, 0.17% manganese, 0.12% magnesium, 0.1% cerium, 0.015% gallium, 0.012% thorium, 0.08% tin, 0.07% impurities, and the balance aluminum.
Or comprises the following components in percentage by mass: 4.2% zinc, 1.2% mesoporous carbon nanoparticles, 0.07% indium, 0.15% cadmium, 0.14% manganese, 0.17% magnesium, 0.08% cerium, 0.015% gallium, 0.012% thorium, 0.06% tin, 0.07% impurities, and the balance aluminum.
The invention is further illustrated below with reference to examples.
Example 1
The high temperature resistant sacrificial anode comprises the following components, by mass, 3% of zinc, 2% of carbon quantum dots, 0.05% of indium, 0.1% of cadmium, 0.2% of manganese, 0.1% of magnesium, 0.12% of cerium, 0.01% of gallium, 0.015% of thorium, 0.06% of tin, 0.05% of impurities and the balance of aluminum.
Example 2
A high temperature resistant sacrificial anode comprises, by mass, 6% zinc, 0.5% carbon quantum dots, 0.1% indium, 0.2% cadmium, 0.1% manganese, 0.2% magnesium, 0.08% cerium, 0.01% gallium, 0.01% thorium, 0.06% tin, 0.1% impurities, and the balance aluminum.
Example 3
A high temperature resistant sacrificial anode comprising the following components in mass fraction: 5% zinc, 1% carbon quantum dots, 0.08% indium, 0.15% cadmium, 0.17% manganese, 0.12% magnesium, 0.1% cerium, 0.015 gallium, 0.012% thorium, 0.08% tin, 0.07% impurities, and the balance aluminum.
Example 4
The high temperature resistant sacrificial anode comprises the following components of 3% zinc, 2% nitrogen doped carbon quantum dots, 0.05% indium, 0.1% cadmium, 0.2% manganese, 0.1% magnesium, 0.12% cerium, 0.02% gallium, 0.015% thorium, 0.1% tin, 0.05% impurities and the balance aluminum by mass percent.
Example 5
A high temperature resistant sacrificial anode comprises 6% zinc, 0.5% nitrogen doped carbon quantum dots, 0.1% indium, 0.2% cadmium, 0.1% manganese, 0.2% magnesium, 0.08% cerium, 0.02 gallium, 0.01% thorium, 0.1% tin, 0.1% impurities and the balance aluminum.
Example 6
The high temperature resistant sacrificial anode comprises the following components of 4.2% of zinc, 1.2% of nitrogen doped carbon quantum dots, 0.07% of indium, 0.15% of cadmium, 0.14% of manganese, 0.17% of magnesium, 0.08% of cerium, 0.015% of gallium, 0.012% of thorium, 0.06% of tin, 0.07% of impurities and the balance of aluminum in percentage by mass.
Example 7
A high temperature resistant sacrificial anode comprises the following components, by mass, 3% of zinc, 2% of phosphorus doped carbon quantum dots, 0.05% of indium, 0.1% of cadmium, 0.2% of manganese, 0.1% of magnesium, 0.12% of cerium, 0.01% of gallium, 0.015% of thorium, 0.06% of tin, 0.05% of impurities and the balance of aluminum.
Example 8
A high temperature resistant sacrificial anode comprises 6% zinc, 0.5% phosphorus doped carbon quantum dots, 0.1% indium, 0.2% cadmium, 0.1% manganese, 0.2% magnesium, 0.08% cerium, 0.02 gallium, 0.01% thorium, 0.1% tin, 0.1% impurities and the balance aluminum.
Example 9
The high temperature resistant sacrificial anode comprises the following components of 4.4% zinc, 1.1% nitrogen doped carbon quantum dots, 0.09% indium, 0.12% cadmium, 0.16% manganese, 0.14% magnesium, 0.08% cerium, 0.015% gallium, 0.012% thorium, 0.06% tin, 0.07% impurities and the balance of aluminum.
Example 10
A high temperature resistant sacrificial anode comprises the following components, by mass, 3% zinc, 2% mesoporous carbon nano particles, 0.05% indium, 0.1% cadmium, 0.2% manganese, 0.1% magnesium, 0.12% cerium, 0.01% gallium, 0.015% thorium, 0.06% tin, 0.05% impurities, and the balance aluminum.
Example 11
A high temperature resistant sacrificial anode comprises, by mass, 6% zinc, 0.5% mesoporous carbon nanoparticles, 0.1% indium, 0.2% cadmium, 0.1% manganese, 0.2% magnesium, 0.08% cerium, 0.02 gallium, 0.01% thorium, 0.1% tin, 0.1% impurities, and the balance aluminum.
Example 12
A high temperature resistant sacrificial anode comprises the following components, by mass, 4.2% of zinc, 1.2% of mesoporous carbon nano particles, 0.07% of indium, 0.15% of cadmium, 0.14% of manganese, 0.17% of magnesium, 0.08% of cerium, 0.015% of gallium, 0.012% of thorium, 0.06% of tin, 0.07% of impurities, and the balance of aluminum.
According to the sacrificial anode formulation of the above examples 1-12, various alloy raw materials are taken, the concentration of the resistance furnace is set at 450 ℃, the aluminum ingot is heated together with the furnace to be completely melted, carbon nano particles are added, then the weighed alloy raw materials are added into aluminum liquid, and are heated to 650 ℃ under the protection of inert gas, and are stirred to be completely reacted, and then the sacrificial anode is obtained after intracranial standing for 10-30min, slagging off, draining by a carbon rod, and natural cooling and solidification in a cast iron mould.
The prepared sacrificial anode is subjected to an electrochemical performance test, and the electrochemical performance test is carried out on the sacrificial anode prepared by the application by adopting a Pranceton electrochemical comprehensive test system according to the standard GB/T17848-1999, wherein the test medium is gas well produced water, and the test temperature is 80 ℃.
The test results are as follows:
as shown in the table above, the sacrificial anode obtained by the components in examples 1-12 has good electrical properties under high temperature conditions, the anode is uniformly corroded, and corrosion products can automatically loosen and fall off, so that the sacrificial anode is suitable for cathodic protection of gas field oil pipes.
Claims (8)
1. The high-temperature-resistant sacrificial anode is characterized by comprising the following components in percentage by mass: 3-6% of zinc, 0.5-2% of carbon nano particles, 0.05-0.1% of indium, 0.1-0.2% of cadmium, 0.1-0.2% of manganese, 0.1-0.2% of magnesium, 0.16-0.35% of other elements and the balance of aluminum, wherein the other elements comprise the following components in percentage by mass: 0.08-0.12% cerium, 0.01-0.02% gallium, 0.01-0.015% thorium and 0.06-0.1% tin, the remainder of the other elements being impurities; the carbon nano particles are carbon quantum dots or nitrogen doped carbon quantum dots or phosphorus doped carbon quantum dots, and when the carbon nano particles are mesoporous carbon nano particles, the particle size of the mesoporous carbon nano particles is 50-100nm, and the mesopores of the mesoporous carbon nano particles are not more than 5nm.
2. The high temperature resistant sacrificial anode according to claim 1, wherein the carbon nanoparticles have a particle size of 2-5nm.
3. The high temperature-resistant sacrificial anode according to claim 1, wherein the carbon nano particles are nitrogen-doped carbon quantum dots, and the mass fraction content of nitrogen in the nitrogen-doped carbon quantum dots is not less than 8%.
4. The high temperature-resistant sacrificial anode according to claim 1, wherein the carbon nano particles are phosphorus-doped carbon quantum dots, and the mass fraction content of phosphorus in the phosphorus-doped carbon quantum dots is not less than 5%.
5. The high temperature resistant sacrificial anode according to claim 1, wherein the mass fraction of impurities is not more than 0.1%.
6. The high temperature resistant sacrificial anode according to claim 1, wherein the carbon nano particles are the carbon quantum dots, and comprise the following components in percentage by mass: 5% zinc, 1% carbon quantum dots, 0.08% indium, 0.15% cadmium, 0.17% manganese, 0.12% magnesium, 0.1% cerium, 0.015% gallium, 0.012% thorium, 0.08% tin, 0.07% impurities, and the balance aluminum.
7. The high temperature resistant sacrificial anode according to claim 1, comprising the following components in percentage by mass: 4.2% zinc, 1.2% mesoporous carbon nanoparticles, 0.07% indium, 0.15% cadmium, 0.14% manganese, 0.17% magnesium, 0.08% cerium, 0.015% gallium, 0.012% thorium, 0.06% tin, 0.07% impurities, and the balance aluminum.
8. A method of preparing the high temperature resistant sacrificial anode of claims 1-7, comprising the steps of:
setting the temperature of a resistance furnace room at 450 ℃, placing aluminum into a furnace, heating to be completely melted, adding the carbon nano particles according to the content, adding other components into aluminum liquid according to the corresponding content, heating to 650 ℃ under the protection of inert gas, stirring to react, standing in the furnace for 10-30min, slagging off, draining by a carbon rod, pouring in a cast iron mold, and naturally cooling and solidifying to obtain the high-temperature-resistant sacrificial anode.
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