CN116790937A - Mastoid structure for improving liquid zinc corrosion resistance of alloy and preparation method thereof - Google Patents
Mastoid structure for improving liquid zinc corrosion resistance of alloy and preparation method thereof Download PDFInfo
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- CN116790937A CN116790937A CN202310111935.6A CN202310111935A CN116790937A CN 116790937 A CN116790937 A CN 116790937A CN 202310111935 A CN202310111935 A CN 202310111935A CN 116790937 A CN116790937 A CN 116790937A
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 118
- 239000011701 zinc Substances 0.000 title claims abstract description 118
- 210000001595 mastoid Anatomy 0.000 title claims abstract description 110
- 239000007788 liquid Substances 0.000 title claims abstract description 108
- 239000000956 alloy Substances 0.000 title claims abstract description 92
- 230000007797 corrosion Effects 0.000 title claims abstract description 91
- 238000005260 corrosion Methods 0.000 title claims abstract description 91
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 90
- 238000002360 preparation method Methods 0.000 title abstract description 17
- 238000005520 cutting process Methods 0.000 claims abstract description 59
- 239000011248 coating agent Substances 0.000 claims description 29
- 238000000576 coating method Methods 0.000 claims description 29
- 229910001257 Nb alloy Inorganic materials 0.000 claims description 19
- 229910009043 WC-Co Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 229910000684 Cobalt-chrome Inorganic materials 0.000 claims description 9
- 239000010952 cobalt-chrome Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 8
- 229910000531 Co alloy Inorganic materials 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910000753 refractory alloy Inorganic materials 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000004530 micro-emulsion Substances 0.000 abstract description 3
- 229910001338 liquidmetal Inorganic materials 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 15
- 238000002474 experimental method Methods 0.000 description 12
- 238000005246 galvanizing Methods 0.000 description 9
- 238000003723 Smelting Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000000758 substrate Substances 0.000 description 6
- 238000011160 research Methods 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000010892 electric spark Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 ni 3 Although the Al Inorganic materials 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
-
- 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
-
- 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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a mastoid structure for improving liquid zinc corrosion resistance of an alloy and a preparation method thereof, belonging to the technical field of liquid metal corrosion resistance. The mastoid structures are uniformly distributed on the surface of the alloy, and the mastoid size is 0.03-1mm. The preparation method comprises the steps of adopting two-time wire-cut electric discharge machining to prepare the mastoid structure for improving the liquid zinc corrosion resistance of the alloy ingot; wherein: the first cutting is to transversely cut the alloy to obtain an initial alloy, and the second cutting is to rotate the initial alloy by 90 degrees and then radially cut the alloy to obtain a final alloy with a mastoid structure. The micro-emulsion structure on the surface of the alloy has simple preparation process, wide application range, low cost and high efficiency, and is beneficial to industrial mass production.
Description
The patent application claims the priority of application number 202210855241.9, application date 20220720 and the invention name of mastoid structure for improving the liquid zinc corrosion resistance of alloy and preparation method.
Technical Field
The invention belongs to the technical field of liquid metal corrosion resistance, and relates to a mastoid structure for improving liquid zinc corrosion resistance of an alloy and a preparation method thereof.
Background
In corrosion protection of steel, hot dip galvanization is considered to be an economical and efficient method. However, liquid zinc (450-650 ℃) has a very strong corrosive action on metal equipment. Therefore, the problems of high zinc consumption, short service life of zinc plating equipment and the like commonly exist in the zinc plating industry at present. Hot galvanizing equipment (zinc pot, heating pipe sleeve, sink roll, bearing and the like) is severely corroded in zinc liquid, so that huge waste of the hot galvanizing equipment is caused, the production efficiency and the product quality of the hot galvanizing equipment are greatly reduced, and the production cost is further improved. Therefore, improving the liquid zinc corrosion resistance of hot dip galvanizing equipment is an urgent need for continuous hot dip galvanizing production lines.
In recent years, research on liquid zinc corrosion resistant materials at home and abroad is increasing, and progress is made to a certain extent. Stainless steel, ni 3 Although the Al, cobalt-based alloy and other materials have certain corrosion resistance, the corrosion speed of the Al, cobalt-based alloy and other materials in liquid zinc is only delayed; and part of the materials are large in brittleness, and part of metal elements contained in the materials are high in price and are not suitable for industrial production.
At present, a sink roll of a continuous hot dip galvanizing production line commonly adopts a stainless steel substrate to be sprayed with a WC-Co coating, the service life of the WC-Co coating in liquid zinc is very short, and the corrosion service life of the WC-Co coating is usually 1-2 weeks [ WangWJ, linJP, wangYL, etal.IsothermalcorrosionTiAl-Nballoyinquidzinc.
The novel MoB-CoCr coating sprayed on the stainless steel substrate shows good corrosion resistance in liquid zinc; compared with the traditional WC-Co coating, the corrosion resistant life of the MoB-CoCr coating is longer than 25 days [ Zhang JF, dengCM, songJB, etal.MoB-CoCrasaratentivelisto WC-12Coforstainless steelprotectivecoatinganditscorrosionbehaviorinmoltenzinc.Surfaceand CoatingsTechnology,2013,235:811-818]. However, the coating is easy to peel off due to factors such as microcracks caused by thermal stress in the coating, poor bonding strength between the coating and the substrate, thermal shock in the service environment and the like, so that the failure of the material is accelerated.
Chinese patent No. CN1804081a discloses that TiAl-Nb alloys have excellent resistance to liquid zinc corrosion in liquid zinc over a fairly broad composition range, however their corrosion life in liquid zinc is below 100 days.
Chinese patent CN102418064a discloses a method for preparing a liquid zinc corrosion resistant supersonic spray TiAl-Nb composite coating, the corrosion life of the coating prepared by supersonic spray in liquid zinc is less than 50 days; and the adhesive layer is required to be prepared on the surface of the substrate, and then the coating is prepared, so that the preparation process is complex, the cost is high, and the efficiency is low.
Chinese patent CN102352504a discloses a pretreatment method for improving the liquid zinc corrosion resistance of TiAl-Nb alloy, by performing special quartz tube sealing on the TiAl-Nb alloy, and then preserving heat at 900-1050 ℃ for 12-20 hours, thereby improving the liquid zinc corrosion resistance of the alloy, and the corrosion life of Ti-45Al-8Nb alloy in liquid zinc is 85 days.
Obviously, the prior art cannot be used for hot galvanizing equipment materials, the preparation cost is high, the corrosion life in liquid zinc is low, the mechanical property of the whole material cannot be improved together with the corrosion resistance of the liquid zinc, the coating is prepared by poor adhesion with a substrate, the coating is easy to peel off under thermal shock, the production cost is increased if a bonding layer is added, and the corrosion life is also not high.
Disclosure of Invention
The invention aims to solve the technical problems of low corrosion life of a hot galvanizing equipment material in liquid zinc in the prior art, in particular to the problems of unmatched mechanical property and liquid zinc corrosion resistance when the hot galvanizing equipment material is used as an integral material, poor adhesion with a substrate, low liquid zinc corrosion resistance and the like in the preparation of a coating.
In order to solve the technical problems, the invention provides the following technical scheme:
the mastoid structure for improving the liquid zinc corrosion resistance of the alloy is uniformly distributed on the surface of the alloy, and the mastoid size is 0.03-1mm.
Preferably, the mastoid structures are distributed on the surface of the alloy in an array manner, and the mastoid size is 0.03-0.6mm.
Preferably, irregularly distributed micro-nano small holes exist on the surface of the mastoid structure, and the porosity is 40-60%.
Preferably, the liquid zinc corrosion performance of the mastoid structure is improved by more than 6 times compared with the WC-Co coating and more than 4 times compared with the MoB-CoCr coating.
Preferably, the alloy is any one of TiAl-Nb alloy, 316L stainless steel, stellite6 and TribaloyT-800 cobalt-based alloy, tungsten and molybdenum refractory alloy, WC-Co cemented carbide and nickel-based alloy material.
Preferably, the TiAl-Nb alloy comprises the following components in percentage by mass: 25-60% of Al, 10-25% of Nb, 0-1% of Y and the balance of Ti.
According to the preparation method of the mastoid structure for improving the liquid zinc corrosion resistance of the alloy, the mastoid structure for improving the liquid zinc corrosion resistance of the alloy is prepared by adopting two wire-cut electric discharge machining for alloy ingots; wherein: the first cutting is to transversely cut the alloy to obtain an initial alloy, and the second cutting is to rotate the initial alloy by 90 degrees and then radially cut the alloy to obtain a final alloy with a mastoid structure.
Preferably, the alloy ingot is obtained by smelting in a vacuum magnetic suspension smelting furnace and annealing heat treatment of keeping the temperature at 1250 ℃ for 12 hours.
Preferably, the two-time wire electric discharge machine sets different cutting parameters of the high-speed wire electric discharge machine before preparing the mastoid structure, wherein the different cutting parameters comprise the use of cutting wires with the diameter of 0.06-0.3mm and the cutting speed of 20-250mm 2 The servo voltage is 2-48V, the pulse width gap is 1-32 mu s, and the discharge current is 1-10A.
Preferably, the cutting depth of the first and second cuts is 0.03-1.2mm.
Preferably, after the final alloy with the mastoid structure is cut, the final alloy is placed in an acetone solution for ultrasonic cleaning for 5-15 minutes, then is washed by clean water, is placed in an ethanol solution for ultrasonic cleaning for 5-15 minutes, and finally is dried by a blower for standby.
Preferably, the final alloy with the mastoid structure is placed in a graphite crucible containing liquid zinc with 2% of aluminum by mass, an isothermal static corrosion test is carried out at 460 ℃ in a well-type heating furnace, and the corrosion life of the alloy with the mastoid structure in the liquid zinc is improved by 20-35 days compared with the alloy without the mastoid structure.
Compared with the prior art, the invention has the following beneficial effects:
in the scheme, the corrosion resistance of the TiAl-Nb alloy is related to the surface state, so that the surface structure of the TiAl-Nb alloy is regulated, and the liquid zinc corrosion resistance of the TiAl-Nb alloy can be further improved by preparing a mastoid structure through repeated researches of a plurality of tests and theories, so that the research has important guiding significance and application value, and no related report exists at home and abroad at present.
The mastoid structure for improving the liquid zinc corrosion resistance of the TiAl-Nb alloy and the preparation method thereof are not only suitable for the TiAl-Nb alloy, but also suitable for stainless steel such as 316L, cobalt-based alloys such as Stellite6 and TribaloyT-800, refractory alloys such as tungsten and molybdenum, hard alloys such as WC-Co, and materials such as nickel-based alloys.
The invention utilizes the mastoid structure to improve the liquid zinc corrosion resistance of the TiAl-Nb alloy, the mastoid is uniformly distributed, the mastoid size is 0.03-1mm, the preparation process of the mastoid structure is simple, the liquid zinc corrosion resistance effect is obvious, and the problem of poor corrosion resistance of the traditional material is solved.
The micro-emulsion structure on the surface of the alloy has simple preparation process, wide application range, low cost and high efficiency, and is beneficial to industrial mass production.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a microstructure micro-morphology diagram of a mastoid structure for improving the resistance to liquid zinc corrosion of an alloy prepared in example 1 of the present invention;
FIG. 2 is a macroscopic morphology diagram of the mastoid structure prepared in example 1 of the present invention after 120 days of immersion in liquid zinc to improve the corrosion resistance of alloy liquid zinc;
FIG. 3 is a microscopic cross-sectional morphology diagram of the mastoid structure prepared in example 1 of the present invention after 154 days of immersion in liquid zinc to improve the resistance of the alloy to corrosion by liquid zinc;
FIG. 4 is a graph showing comparison of the liquid zinc corrosion resistant life of the mastoid structure, WC-Co coating and MoB-CoCr coating prepared in example 1 of the present invention to improve the liquid zinc corrosion resistance of the alloy.
Detailed Description
The technical solutions and the technical problems to be solved in the embodiments of the present invention will be described below in conjunction with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present patent.
Example 1
The nominal composition of the alloy used in the experiment is 28.15Ti-63.4Al-8.25Nb-0.2Y (atomic percent), the cast ingot is obtained by smelting in a vacuum magnetic suspension smelting furnace, and the cast ingot is subjected to annealing heat treatment at 1250 ℃ for 12 hours. Cutting on the surface of 28.15Ti-63.4Al-8.25Nb-0.2Y alloy by using a high-speed wire-moving electric spark wire cutting machine, wherein the diameter of the cutting wire is 0.18mm, and the cutting speed is 80mm 2 /min, servo electricityThe pressure is 32V, the pulse width gap is 6 mu s, the discharge current is 2A, the cutting mastoid size is set to be 0.2mm, and the cutting depth is set to be 0.2mm; firstly, transversely cutting 28.15Ti-63.4Al-8.25Nb-0.2Y alloy, and then, rotating 28.15Ti-63.4Al-8.25Nb-0.2Y alloy by 90 degrees and then radially continuing cutting to obtain a sample with a mastoid structure, wherein the mastoid structure is distributed in an array manner as shown in figure 1, and the surface of the mastoid structure is provided with irregularly distributed micro-nano small holes with the porosity of 52%.
The sample is placed in a graphite crucible filled with liquid zinc (containing 0.2% of aluminum by mass fraction), isothermal (460 ℃) static corrosion experiment is carried out in a well type heating furnace, and the surface morphology is taken out and observed every 2-5 days. The structure of the sample remained intact after 120 days of immersion in liquid zinc, and was not corroded by liquid zinc, as shown in fig. 2. Although liquid zinc is adhered to the surface of the sample, the sample is gently shaken, and the zinc adhered to the surface automatically falls off from the surface, so that the wettability of the surface of the sample with the liquid zinc is poor.
The corrosion life of the liquid zinc of the 28.15Ti-63.4Al-8.25Nb-0.2Y alloy sample with the mastoid structure is 154 days, as shown in figure 3, and the corrosion life is greatly improved compared with WC-Co coating and MoB-CoCr coating, as shown in figure 4; the improvement effect of the mastoid structure on the corrosion life of the sample liquid zinc is remarkable, the corrosion life of the 28.15Ti-63.4Al-8.25Nb-0.2Y alloy of the mastoid structure in liquid zinc is improved by more than 10 times compared with a WC-Co coating, is improved by more than 4 times compared with a MoB-CoCr coating, and is improved by more than 33 days compared with 28.15Ti-63.4Al-8.25Nb-0.2Y alloy without the mastoid structure.
Example 2
The nominal composition of the alloy used in the experiment is 47Ti-45Al-8Nb (atomic percent), the cast ingot is obtained by smelting in a vacuum magnetic suspension smelting furnace, and the cast ingot is subjected to annealing heat treatment at 1250 ℃ for 12 hours. Cutting the surface of the 47Ti-45Al-8Nb alloy by adopting a high-speed wire-moving electric spark wire cutting machine, wherein the diameter of a cutting wire is 0.2mm, and the cutting speed is 40mm 2 The servo voltage is 16V, the pulse width gap is 4 mu s, the discharge current is 1A, the cutting mastoid size is set to be 0.5mm, and the cutting depth is set to be 0.2mm; firstly, transversely cutting 47Ti-45Al-8Nb alloy, then rotating the 47Ti-45Al-8Nb alloy by 90 degrees, and then radially continuing cutting to obtain a sample with a mastoid structureIs distributed in an array, micro-nano small holes distributed irregularly exist on the surface of the mastoid structure, and the porosity is 55%.
The sample is placed in a graphite crucible filled with liquid zinc (containing 0.2% of aluminum by mass fraction), isothermal (460 ℃) static corrosion experiment is carried out in a well type heating furnace, and the surface morphology is taken out and observed every 2-5 days. The structure of the sample is kept complete after 80 days of immersion in liquid zinc, and the sample is not corroded by the liquid zinc. Although liquid zinc is adhered to the surface of the sample, the sample is gently shaken, and the zinc adhered to the surface automatically falls off from the surface, so that the wettability of the surface of the sample with the liquid zinc is poor.
The liquid zinc corrosion life of the 47Ti-45Al-8Nb alloy sample with the mastoid structure is 102 days, and the mastoid structure has remarkable effect of improving the liquid zinc corrosion life of the sample, wherein the corrosion life of the 47Ti-45Al-8Nb alloy with the mastoid structure in liquid zinc is improved by more than 6 times compared with a WC-Co coating, is improved by more than 3 times compared with a MoB-CoCr coating, and is improved by 30 days compared with the 47Ti-45Al-8Nb alloy without the mastoid structure.
Example 3
The alloy used in the experiment is 17Ti-75Al-8Nb (atomic percent), the cast ingot is obtained by smelting in a vacuum magnetic suspension smelting furnace, and the cast ingot is subjected to annealing heat treatment at 1250 ℃ for 12 hours. Cutting on the surface of 17Ti-75Al-8Nb alloy by using a high-speed wire-moving wire-cut electric discharge machine, wherein the diameter of the cutting wire is 0.1mm, and the cutting speed is 80mm 2 The servo voltage is 32V, the pulse width gap is 16 mu s, the discharge current is 4A, the cutting mastoid size is set to be 0.3mm, and the cutting depth is set to be 0.2mm; firstly, transversely cutting 17Ti-75Al-8Nb alloy, then, rotating the 17Ti-75Al-8Nb alloy by 90 degrees, and then, radially continuing cutting to obtain a sample with a mastoid structure, wherein the mastoid structure is distributed in an array manner, and micro-nano-scale pores irregularly distributed are formed on the surface of the mastoid structure, and the porosity is 44%.
The sample is placed in a graphite crucible filled with liquid zinc (containing 0.2% of aluminum by mass fraction), isothermal (460 ℃) static corrosion experiment is carried out in a well type heating furnace, and the surface morphology is taken out and observed every 2-5 days. The structure of the sample is kept complete after the sample is soaked in liquid zinc for 170 days, and the sample is not corroded by the liquid zinc. Although liquid zinc is adhered to the surface of the sample, the sample is gently shaken, and the zinc adhered to the surface automatically falls off from the surface, so that the wettability of the surface of the sample with the liquid zinc is poor.
The liquid zinc corrosion life of the 17Ti-75Al-8Nb alloy sample with the mastoid structure is 205 days, the mastoid structure has remarkable effect of improving the liquid zinc corrosion life of the sample, the corrosion life of the 17Ti-75Al-8Nb alloy with the mastoid structure in liquid zinc is improved by more than 13 times compared with a WC-Co coating, is improved by more than 7 times compared with a MoB-CoCr coating, and is improved by 35 days compared with the 17Ti-75Al-8Nb alloy without the mastoid structure.
Example 4
The alloy used in the experiment is commercial 316L stainless steel, a high-speed wire-moving wire-cut electric discharge machine is adopted to cut on the surface of the 316L stainless steel, the diameter of a cutting wire is 0.2mm, and the cutting speed is 60mm 2 The servo voltage is 16V, the pulse width gap is 8 mu s, the discharge current is 2A, the cutting mastoid size is set to be 0.1mm, and the cutting depth is set to be 0.2mm; firstly, transversely cutting 316L stainless steel, then rotating the 316L stainless steel by 90 degrees, and then radially continuously cutting to obtain a sample with mastoid structures, wherein the mastoid structures are distributed in an array mode, and micro-nano-scale pores distributed irregularly exist on the surface of the mastoid structures, and the porosity is 50%.
The sample is placed in a graphite crucible filled with liquid zinc (containing 0.2% of aluminum by mass fraction), isothermal (460 ℃) static corrosion experiment is carried out in a well type heating furnace, and the surface morphology is taken out and observed every 2-5 days. The structure of the sample is kept complete after being soaked in liquid zinc for 10 days, and the sample is not corroded by the liquid zinc. Although liquid zinc is adhered to the surface of the sample, the sample is gently shaken, and the zinc adhered to the surface automatically falls off from the surface, so that the wettability of the surface of the sample with the liquid zinc is poor.
The liquid zinc corrosion life of the 316L stainless steel sample with the mastoid structure is 21 days, the mastoid structure has remarkable effect of improving the liquid zinc corrosion life of the sample, and the corrosion life of the 316L stainless steel with the mastoid structure in liquid zinc is improved by more than 20 days compared with the 316L stainless steel without the mastoid structure.
Example 5
The alloy used in the experiment is commercial Stellite6, a high-speed wire-moving wire-electrode cutting machine is adopted to cut on the surface of the Stellite6, the diameter of a cutting wire is 0.18mm,cutting speed is 80mm 2 The servo voltage is 24V, the pulse width gap is 12 mu s, the discharge current is 4A, the cutting mastoid size is set to be 0.2mm, and the cutting depth is set to be 0.2mm; firstly, transversely cutting the Stellite6, then rotating the Stellite6 by 90 degrees, and then radially continuing cutting to obtain a sample with mastoid structures, wherein the mastoid structures are distributed in an array mode, and micro-nano-scale pores distributed irregularly exist on the surface of the mastoid structures, and the porosity is 53%.
The sample is placed in a graphite crucible filled with liquid zinc (containing 0.2% of aluminum by mass fraction), isothermal (460 ℃) static corrosion experiment is carried out in a well type heating furnace, and the surface morphology is taken out and observed every 2-5 days. The structure of the sample is kept complete after being soaked in liquid zinc for 15 days, and the sample is not corroded by the liquid zinc. Although liquid zinc is adhered to the surface of the sample, the sample is gently shaken, and the zinc adhered to the surface automatically falls off from the surface, so that the wettability of the surface of the sample with the liquid zinc is poor.
The corrosion life of the room temperature Stellite6 sample with the mastoid structure is 29 days, the improvement effect of the mastoid structure on the corrosion life of the sample with the liquid zinc is remarkable, and the corrosion life of the room temperature Stellite6 with the mastoid structure in the liquid zinc is improved by 24 days compared with the room temperature Stellite6 without the mastoid structure.
Example 6
The alloy used in the experiment is commercial TribaloyT-800, a high-speed wire-moving electric discharge machine is adopted to cut on the surface of the TribaloyT-800, the diameter of a cutting wire is 0.1mm, and the cutting speed is 60mm 2 The servo voltage is 16V, the pulse width gap is 32 mu s, the discharge current is 4A, the cutting mastoid size is set to be 0.4mm, and the cutting depth is set to be 0.2mm; firstly, transversely cutting TribaloyT-800, then rotating the TribaloyT-800 by 90 degrees, and then radially continuing cutting to obtain a sample with mastoid structures, wherein the mastoid structures are distributed in an array manner, and micro-nano-scale pores distributed irregularly exist on the surface of the mastoid structures, and the porosity is 52%.
The sample is placed in a graphite crucible filled with liquid zinc (containing 0.2% of aluminum by mass fraction), isothermal (460 ℃) static corrosion experiment is carried out in a well type heating furnace, and the surface morphology is taken out and observed every 2-5 days. The structure of the sample is kept complete after being soaked in liquid zinc for 30 days, and the sample is not corroded by the liquid zinc. Although liquid zinc is adhered to the surface of the sample, the sample is gently shaken, and the zinc adhered to the surface automatically falls off from the surface, so that the wettability of the surface of the sample with the liquid zinc is poor.
The liquid zinc corrosion life of the room temperature TribaloyT-800 sample with the mastoid structure is 35 days, the improvement effect of the mastoid structure on the liquid zinc corrosion life of the sample is remarkable, and the corrosion life of the room temperature TribaloyT-800 with the mastoid structure in liquid zinc is 28 days longer than that of the room temperature TribaloyT-800 without the mastoid structure.
In the scheme, the corrosion resistance of the TiAl-Nb alloy is related to the surface state, so that the surface structure of the TiAl-Nb alloy is regulated, and the liquid zinc corrosion resistance of the TiAl-Nb alloy can be further improved by preparing a mastoid structure through repeated researches of a plurality of tests and theories, so that the research has important guiding significance and application value, and no related report exists at home and abroad at present.
The mastoid structure for improving the liquid zinc corrosion resistance of the TiAl-Nb alloy and the preparation method thereof are not only suitable for the TiAl-Nb alloy, but also suitable for stainless steel such as 316L, cobalt-based alloys such as Stellite6 and TribaloyT-800, refractory alloys such as tungsten and molybdenum, hard alloys such as WC-Co, and materials such as nickel-based alloys.
The invention utilizes the mastoid structure to improve the liquid zinc corrosion resistance of the TiAl-Nb alloy, the mastoid is uniformly distributed, the mastoid size is 0.03-1mm, the preparation process of the mastoid structure is simple, the liquid zinc corrosion resistance effect is obvious, and the problem of poor corrosion resistance of the traditional material is solved.
The micro-emulsion structure on the surface of the alloy has simple preparation process, wide application range, low cost and high efficiency, and is beneficial to industrial mass production.
The above-described wire-cut electric discharge machine is only one of them, and the method for producing the mastoid structure of the present invention is not limited to the wire-cut electric discharge machine, laser texturing, laser shock peening, shot peening, etc. described above, but the mastoid structure of the present invention may also be produced.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The mastoid structure for improving the liquid zinc corrosion resistance of the alloy is characterized in that the mastoid structure is uniformly distributed on the surface of the alloy, and the mastoid size is 0.03-1mm.
2. The mastoid structure for improving the resistance to liquid zinc corrosion of an alloy according to claim 1, wherein the mastoid structure is distributed in an array on the surface of the alloy, and the mastoid size is 0.03-0.6mm.
3. The mastoid structure for improving the liquid zinc corrosion resistance of alloy according to claim 1, wherein the surface of the mastoid structure is provided with irregularly distributed micro-nano small holes, and the porosity is 40-60%.
4. The mastoid structure for improving the liquid zinc corrosion resistance of an alloy according to claim 1, wherein the liquid zinc corrosion resistance of the mastoid structure is improved by more than 6 times compared with a WC-Co coating and by more than 4 times compared with a MoB-CoCr coating.
5. The mastoid structure for improving the resistance of an alloy to liquid zinc corrosion according to claim 1, wherein said alloy is any one of TiAl-Nb alloy, 316L stainless steel, stellite6 and TribaloyT-800 cobalt-based alloy, tungsten and molybdenum refractory alloy, WC-Co cemented carbide, and nickel-based alloy materials.
6. The mastoid structure for improving the liquid zinc corrosion resistance of an alloy according to claim 5, wherein the TiAl-Nb alloy comprises the following components in percentage by mass: 25-60% of Al, 10-25% of Nb, 0-1% of Y and the balance of Ti.
7. A method for preparing a mastoid structure for improving the liquid zinc corrosion resistance of an alloy according to any one of claims 1 to 6, characterized in that the mastoid structure for improving the liquid zinc corrosion resistance of the alloy is prepared by wire cutting an alloy ingot twice; wherein: the first cutting is to transversely cut the alloy to obtain an initial alloy, and the second cutting is to rotate the initial alloy by 90 degrees and then radially cut the alloy to obtain a final alloy with a mastoid structure.
8. The mastoid structure for improving the resistance to liquid zinc corrosion of alloy according to claim 7, wherein the two wire electric discharge machine sets different cutting parameters of the high speed wire electric discharge machine before preparing the mastoid structure, wherein the different cutting parameters comprise using cutting wire diameter of 0.06-0.3mm and cutting speed of 20-250mm 2 The servo voltage is 2-48V, the pulse width gap is 1-32 mu s, and the discharge current is 1-10A.
9. The mastoid structure for improving resistance to liquid zinc corrosion of an alloy according to claim 7, wherein the cutting depth of said first and second cuts is 0.03-1.2mm.
10. The mastoid structure for improving the corrosion resistance of alloy liquid zinc according to claim 7, wherein the final alloy with mastoid structure is placed in a graphite crucible containing liquid zinc containing 2% of aluminum by mass, an isothermal static corrosion test is carried out at 460 ℃ in a well type heating furnace, and the corrosion life of the alloy with mastoid structure in liquid zinc is improved by 20-35 days compared with the alloy without mastoid structure.
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