CN116411192A - Preparation method of alloy resistant to molten salt corrosion - Google Patents
Preparation method of alloy resistant to molten salt corrosion Download PDFInfo
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- CN116411192A CN116411192A CN202310169024.9A CN202310169024A CN116411192A CN 116411192 A CN116411192 A CN 116411192A CN 202310169024 A CN202310169024 A CN 202310169024A CN 116411192 A CN116411192 A CN 116411192A
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- 239000000956 alloy Substances 0.000 title claims abstract description 88
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 88
- 230000007797 corrosion Effects 0.000 title claims abstract description 87
- 238000005260 corrosion Methods 0.000 title claims abstract description 87
- 150000003839 salts Chemical class 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000000137 annealing Methods 0.000 claims abstract description 16
- 239000002923 metal particle Substances 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 12
- 230000008018 melting Effects 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000004506 ultrasonic cleaning Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 6
- 239000012298 atmosphere Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000012300 argon atmosphere Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims 4
- 239000011780 sodium chloride Substances 0.000 claims 2
- 239000000460 chlorine Substances 0.000 abstract description 9
- 229910052801 chlorine Inorganic materials 0.000 abstract description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 8
- 239000010813 municipal solid waste Substances 0.000 abstract description 8
- 230000001681 protective effect Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004626 scanning electron microscopy Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910001514 alkali metal chloride Inorganic materials 0.000 description 1
- 229910052977 alkali metal sulfide Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a preparation method of a molten salt corrosion resistant alloy, which is characterized by comprising the following steps: respectively taking Ni, al, cr and Ti metal particles, and carrying out ultrasonic cleaning and drying; weighing the dried metal particles according to the mass ratio, and uniformly mixing; and carrying out vacuum arc melting on the mixture to obtain an alloy ingot, and carrying out vacuum annealing treatment on the alloy ingot to obtain the molten salt corrosion resistant alloy. The preparation method of the molten salt corrosion resistant alloy provided by the invention is characterized by low price and better corrosion resistance of Al and Cr. The Ni-based alloy is doped and modified by Ti and other elements to prepare the protective material which has high cost performance and is suitable for being used in high-temperature chlorine-containing environments such as garbage incineration and the like.
Description
Technical Field
The invention relates to the technical field of high-temperature-resistant molten salt corrosion alloy design, in particular to a preparation method of a molten salt corrosion-resistant alloy.
Background
Along with the construction of Chinese townThe acceleration of the progress and the improvement of the living standard of people, a large number of population centers to cities, and inexhaustible power is provided for the prosperous development of the countries, but a series of problems are caused to the cities at the same time. Among them, the difficulty in disposing of a large amount of municipal solid waste has become a prominent problem facing people. Aiming at the treatment of urban household garbage, the mode of garbage incineration is advocated comparatively. However, large amounts of corrosive gases, such as HCl, C l, are generated during the incineration of waste 2 、SO 2 Etc. Among the many corrosion factors, cl "is considered the most damaging element that can react with metals to form low boiling, high vapor pressure metal chlorides by an" activated oxidation "mechanism, accelerating the corrosion process. Meanwhile, in the garbage incineration process, a large amount of fly ash is deposited on the surface of the tube bank, and the fly ash contains more alkali metal chlorides, sulfides and the like, so that the fused salt corrosion is easy to form on the surface of the tube bank by combining the products and characteristics of gas corrosion. The molten salt corrosion containing Cl, S, K and other elements can cause serious damage to the surface of the pipeline, and the damage degree is far higher than that of the corrosion containing chlorine atmosphere.
Research shows that the I ncone l 625 nickel-based alloy shows good corrosion resistance in material protection of garbage incineration plants. However, the high price of I ncone l 625 limits its wide application in practical conditions. On the other hand, the types of alloys or coating materials that can be used in high temperature chlorine corrosive environments are very limited.
Disclosure of Invention
Based on the above, the invention aims to provide a preparation method of a molten salt corrosion resistant alloy, which is characterized in that elements such as Al, cr and the like with low price and better corrosion resistance are doped and modified on a N i base alloy to prepare a protective material with high cost performance and suitable for being used in high-temperature chlorine-containing environments such as garbage incineration and the like.
The invention provides a preparation method of a molten salt corrosion resistant alloy, which comprises the following steps:
respectively taking N i, al, cr and Ti metal particles, and carrying out ultrasonic cleaning and drying;
weighing the dried metal particles according to the mass ratio, and uniformly mixing;
and carrying out vacuum arc melting on the mixture to obtain an alloy ingot, and carrying out vacuum annealing treatment on the alloy ingot to obtain the molten salt corrosion resistant alloy.
In a preferred embodiment of the invention, the molten salt corrosion resistant alloy consists of the following elements in percentage by mass: n i 66% -76%, A l 11.5.5% -12.5%, cr9.5% -10.5%, T i% -12%
In the preferred embodiment of the invention, the mass percentage of T i in the molten salt corrosion resistant alloy is 2% or 9% or 10% or 12%.
In the preferred embodiment of the invention, the metal purity of the N i, al, cr and T i metal particles are all 99.99%.
In the preferred embodiment of the present invention, in the steps of ultrasonic cleaning and drying, N i, al, cr and T i metal particles are taken respectively:
the ultrasonic medium for ultrasonic cleaning is a mixed solution of acetic acid and ethanol, and V Acetic acid, ethanol ＝1:1。
In a preferred embodiment of the invention, in the step of subjecting the mixture to vacuum arc melting to obtain an alloy ingot:
the arc smelting condition of the vacuum arc smelting is argon atmosphere and one atmosphere pressure, and the current of the vacuum arc smelting is 180A-220A.
In a preferred embodiment of the present invention, in the step of vacuum annealing the alloy ingot:
the annealing temperature is 850-950 ℃ and the annealing time is 20-28 h.
In a preferred embodiment of the invention, the molten salt comprises NaC l, KCl and K 2 SO 4 Wherein the mass ratio of each component in the molten salt is NaC l to KCl to K 2 SO 4 ＝(4.5-5.5):(4.5-5.5):(1.5-2.5)。
In a preferred embodiment of the invention, the corrosion conditions of the refractory salt corrosion alloy are: and (3) placing the alloy resistant to molten salt corrosion into the prepared molten salt, and heating to 650-750 ℃ for 110-130 h.
In summary, according to the preparation method of the molten salt corrosion resistant alloy, the N i base alloy is doped and modified by A l, cr, T i and other elements with low cost and good corrosion resistance, so that the novel N i base molten salt corrosion resistant alloy is prepared, the high temperature chlorine corrosion resistance of the alloy is improved, and the molten salt corrosion resistant alloy is expected to be applied to high temperature oxidizing chlorine atmosphere working conditions, such as a waste incinerator water wall tube bank protective coating material.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method for producing a molten salt corrosion resistant alloy according to an embodiment of the present invention;
FIG. 2 is an X-ray diffraction spectrum of a refractory salt corrosion alloy according to an embodiment of the invention
FIG. 3 is a metallographic photograph of a molten salt corrosion resistant alloy according to an embodiment of the present invention;
FIG. 4 is a schematic representation of a cross-sectional SEM/EDS analysis of samples obtained in examples 1-4 after corrosion.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a flowchart of a method for preparing a refractory salt corrosion alloy according to the present invention is shown, the method comprising steps S01 to S03, wherein:
step S01: respectively taking N i, A l, cr and T i metal particles, and carrying out ultrasonic cleaning and drying;
in this step, the selected metal particles N i, al, cr and T i are all high-purity, the purity is 99.99%, and in the process of ultrasonic cleaning the mixed metal particles, the adopted ultrasonic medium is a mixed solution of acetic acid and ethanol, and the volume ratio of acetic acid to ethanol is 1:1.
step S02: weighing the dried metal particles according to the mass ratio, and uniformly mixing;
in the finally prepared molten salt corrosion resistant alloy, the alloy consists of the following elements in percentage by mass: n i 66% -76%, 11.5% -12.5% Al, 9.5% -10.5% Cr, T i% -12%, exemplary N i may be 66%, 70% or 76% etc., 11.5%, 12% or 12.5% etc., 9.5%, 10% or 10.5% etc., and T i may be 2%, 7% or 12% etc.
Preferably, when the mass percentage of T i in the molten salt corrosion resistant alloy is 2% or 9% or 10% or 12%, the obtained molten salt corrosion resistant alloy has better corrosion resistance.
Step S03: carrying out vacuum arc melting on the mixture to obtain an alloy ingot, and carrying out vacuum annealing treatment on the alloy ingot to obtain the molten salt corrosion resistant alloy;
it is also noted that in this step, the arc melting condition of the vacuum arc melting is an argon atmosphere, the argon gas pressure is one atmosphere, the current of the vacuum arc melting is 180A to 220A, and the current of the vacuum arc melting may be 180A, 200A or 220A, for example.
During the vacuum annealing treatment, the annealing temperature is 850-950 ℃ and the annealing time is 20-28 h, and the annealing temperature may be 850 ℃, 900 ℃ or 950 ℃ and the annealing time may be 20h, 24h or 28h, etc. as examples.
It can be understood that after the molten salt corrosion resistant alloy is prepared, the corrosion behavior of the prepared NiA l CrT i alloy in the mixed molten salt is detected, specifically, the molten salt corrosion resistant alloy is placed in the prepared molten salt, the temperature is raised to 650-750 ℃ and the corrosion time is 110-130 h, wherein the mass ratio of each component in the molten salt is NaC l to KCl to K 2 SO 4 = (4.5-5.5): (4.5-5.5): (1.5-2.5), preferably, the molten salt temperature can be heated to 650 ℃, 700 ℃ or 750 ℃ and so on, the corrosion time can be 110h, 120h or 130h, and the mass ratio of each component in the molten salt can be: naC l, KCl, K 2 SO 4 =4.5: 4.5:1.5 or NaC l: KCl: K 2 SO 4 =5: 5:2 or NaC l: KCl: K 2 SO 4 ＝5.5：5.5：2.5。
Examples 1 to 8
First, metal particles of high-purity Ni (99.99%), al (99.99%), cr (99.99%), and T i (99.99%) were respectively taken, ultrasonically cleaned, and dried. And weighing metal particles according to the component dose, and uniformly mixing to respectively prepare Ni12Al10Cr-2Ti alloy, ni12Al10Cr-9Ti alloy, ni12Al10Cr-10Ti alloy, ni12Al10Cr-12Ti alloy, ni11.5Al10Cr-10Ti alloy, ni12.5Al10Cr-10Ti alloy, ni12Al9.5Cr-10Ti alloy and Ni12Al10.5Cr-10Ti alloy.
Secondly, argon shielded arc melting is carried out, and the melting environment is as follows: and (3) carrying out vacuum annealing at 900 ℃ on the alloy for 24 hours under the condition that the argon gas is at 1 atmosphere and the current is 200A, cutting the alloy into small pieces with the size of 2.5 multiplied by 5 multiplied by 10mm, and polishing. Then, XRD and metallographic structure detection are carried out on the sample to determine the structure, the composition and other characteristics of the alloy, please refer to fig. 2 and 3, which show the X-ray diffraction spectrum of the obtained molten salt corrosion resistant alloy and the metallographic photograph of the molten salt corrosion resistant alloy, and the structure, the composition and other characteristics of the molten salt corrosion resistant alloy can be determined according to fig. 2 and 3.
And then carrying out a high-temperature chlorine corrosion experiment on the obtained various molten salt corrosion resistant alloys: various samples were weighed and vernier calipers measured for precise dimensions. The sample is put into a quartz crucible, mixed salt (NaC l: KCl: K2SO4=5:5:2) is adopted for embedding, and then the crucible is put into a muffle furnace, and the temperature of the muffle furnace needs to be raised to 700 ℃ in advance. And (5) preserving the temperature for 5 hours, closing the muffle furnace, taking out and weighing the sample after the sample is cooled along with the furnace, and repeating the operation until the corrosion is finished for 120 hours.
Referring to Table 1 below, a table of chemical element composition and corrosion resistance of the refractory salt corrosion alloy (Ni 12Al10 Cr-xTi) is shown:
TABLE 1NiAlCrTi alloy chemical element composition
As can be seen from Table 1, the corrosion resistance of the novel molten salt corrosion resistant alloy is better when the Al content is 11.5% -12.5%, the Cr content is 9.5% -10.5% and the T i content is 10% -12%, wherein the N i Al10Cr-10T i alloy is the best.
Exemplary, please refer to fig. 4, which is a schematic diagram illustrating SEM/EDS analysis of the samples obtained in examples 1-4 after corrosion, as can be seen from fig. 4: in the corrosion detection process, the microstructure of N i Al10Cr alloy is obviously changed by adding T i, the continuity of dendrites is reduced, and the black phase content is increased. In combination with XRD phase analysis, it was found that the relative concentration of ai 2T i in the alloy increased with increasing T i content. When the addition amount of T i is 2wt.%, the surface oxide of the corroded alloy is mainly Al 2O3, and the oxide can effectively resist C l ion corrosion, thereby playing a role of protecting a matrix. With further increase of T i content, the corrosion product is coated with Al 2 O 3 And Cr (V) 2 O 3 Is mainly mixed oxide of (2) and A l is used as inner layer corrosion product 2 O 3 Or A l 2 O 3 Mixed oxides with nio are dominant. T i element promotes Cr in corrosion products 2 O 3 Is formed by the steps of (a). And A l 2 O 3 Similarly, cr 2 O 3 The product layer generally exhibits better performance in the corrosion resistant characteristics of the alloy.
Further, 2wt.% T i added alloy obtained a single Al during corrosion 2 O 3 The product layer is known from the section morphology of the sample, and the corrosion section of the sample is bent and fluctuated, which indicates that the corrosion process is not uniformly advanced; 9wt.% T i added to fail to obtain a continuous protective oxidation product layer, the sample is severely corroded, and the corrosion layer is obviously cracked and peeled; compared with a sample added by 12wt.% T i with a similar corrosion product layer composition, the corrosion section of the 10wt.% T i added sample is flatter, which indicates that the corrosion process is uniformly carried out, and the characteristics of the structure, the composition and the like of the alloy effectively inhibit the corrosion process.
Finally, the corrosion resistance sequence of the alloy is N i Al10Cr-10T i>N i12A l10Cr-12T i>N i12Al10Cr-2T i>N i12A l10Cr-9T i, and based on the corrosion resistance sequence, the N i-base alloy is doped and modified by elements such as Al, cr, T i and the like with low price and better corrosion resistance, so that the protective material with high cost performance and suitable for being used in high-temperature chlorine-containing environments such as garbage incineration and the like can be effectively prepared.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A method for preparing a molten salt corrosion resistant alloy, the method comprising:
respectively taking Ni, al, cr and Ti metal particles, and carrying out ultrasonic cleaning and drying;
weighing the dried metal particles according to the mass ratio, and uniformly mixing;
and carrying out vacuum arc melting on the mixture to obtain an alloy ingot, and carrying out vacuum annealing treatment on the alloy ingot to obtain the molten salt corrosion resistant alloy.
2. The method for preparing a molten salt corrosion resistant alloy according to claim 1, wherein the molten salt corrosion resistant alloy consists of the following elements in mass percent: 66% -76% of Ni, 11.5% -12.5% of Al, 9.5% -10.5% of Cr and 2% -12% of Ti.
3. The method for producing a molten salt corrosion resistant alloy according to claim 2, wherein the mass percentage of Ti in the molten salt corrosion resistant alloy is 2% or 9% or 10% or 12%.
4. The method of producing a refractory salt corrosion alloy according to claim 1, wherein the metal purity of the Ni, al, cr and Ti metal particles are 99.99%.
5. The method for producing a refractory salt corrosion alloy according to claim 1, wherein in the step of ultrasonic cleaning and drying the respective Ni, al, cr and Ti metal particles:
the ultrasonic medium for ultrasonic cleaning is a mixed solution of acetic acid and ethanol, and V Acetic acid, ethanol ＝1:1。
6. The method of producing a refractory salt corrosion alloy according to claim 1, wherein in the step of subjecting the mixture to vacuum arc melting to obtain an alloy ingot:
the arc smelting condition of the vacuum arc smelting is argon atmosphere and one atmosphere pressure, and the current of the vacuum arc smelting is 180A-220A.
7. The method of producing a refractory salt corrosion alloy according to claim 1, wherein in the step of vacuum annealing the alloy ingot:
the annealing temperature is 850-950 ℃ and the annealing time is 20-28 h.
8. The method of producing a refractory salt corrosion alloy according to claim 1, wherein the molten salt includes NaCl, KCl, and K 2 SO 4 Wherein the mass ratio of each component in the molten salt is NaCl, KCl and K 2 SO 4 ＝(4.5-5.5):(4.5-5.5):(1.5-2.5)。
9. The method for producing a molten salt corrosion resistant alloy according to claim 8, wherein the corrosion conditions of the molten salt corrosion resistant alloy are: and (3) placing the alloy resistant to molten salt corrosion into the prepared molten salt, and heating to 650-750 ℃ for 110-130 h.
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