CN115125595B - Preparation method of titanium-manganese alloy coating - Google Patents

Preparation method of titanium-manganese alloy coating Download PDF

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CN115125595B
CN115125595B CN202210719117.XA CN202210719117A CN115125595B CN 115125595 B CN115125595 B CN 115125595B CN 202210719117 A CN202210719117 A CN 202210719117A CN 115125595 B CN115125595 B CN 115125595B
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titanium
manganese alloy
alloy coating
manganese
metal
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蒋良兴
秦吉涛
刘芳洋
张宗良
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Central South University
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    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
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    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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Abstract

The invention discloses a preparation method of a titanium-manganese alloy coating, which comprises the following steps: (1) Plating a layer of metal Mn on the metal Ti sheet with the surface subjected to etching treatment; (2) And (3) carrying out high-temperature annealing treatment on the titanium sheet with the metal Mn coating on the surface to obtain the titanium-manganese coating material. The titanium-manganese alloy coating provided by the invention adopts vacuum, ar and N 2 Or NH 3 The Mn is respectively permeated to the surface of the metal titanium in a solid dispersion way under the action of high temperature by atmosphere annealing treatment, so that the combination of titanium and manganese is very tight, and the prepared titanium-manganese coating has very high strength and has better adhesive force with a substrate; the whole preparation process is in an oxygen isolation state, and the prepared titanium-manganese alloy coating has high purity. The titanium-manganese alloy coating prepared by the process is compact and smooth, high in strength, strong in coating adhesion and low in cost, and meanwhileThe preparation process is simple, and is easy to implement in process and mass production.

Description

Preparation method of titanium-manganese alloy coating
Technical Field
The invention belongs to the field of alloy materials, relates to a preparation method of an alloy coating material, and in particular relates to a preparation method of a titanium-manganese alloy coating material.
Background
With the development of scientific technology, many new material surface technologies such as electroplating, electroless plating, overlaying, thermal spraying, chemical conversion coating, vapor deposition, casting infiltration and the like are continuously emerging, and the technologies have better effects on improving the strength and the service life of the material. In recent years, the standards for hydrogen storage capability and EMD preparation are continuously improved, and more titanium alloy materials are widely used in the standards, wherein the titanium manganese alloy materials are the most representative. The titanium-manganese alloy has the advantages of large hydrogen storage capacity, easy activation, capability of absorbing and releasing hydrogen at low pressure, abundant raw materials, low cost, easy alloy processing and the like. Thus, titanium manganese alloy as AB 2 Typical representatives of the type of hydrogen storage alloys are widely studied.
In addition, in the process of preparing the EMD, the titanium-manganese alloy has special properties, such as high strength, strong corrosion resistance and good conductivity, and is also widely applied. In addition, the ratio of titanium to manganese can be regulated according to the use requirement of the application environment, so that the chemical components, tissues and performances of the titanium-manganese alloy layer can be optimally matched, and the difficulty of poor casting performance of the titanium alloy material can be overcome. At present, the preparation of the titanium-manganese alloy coating material mainly adopts the processes of infiltration casting, mixed slurry preparation, sintering and the like to form the titanium-based titanium-manganese alloy coating material.
Patent CN 87216402 discloses a composite anode for electrolysis, mainly the method for preparing anode material for titanium-based titanium-manganese coating: the method comprises the steps of coating a mixed slurry on the surface of a pure titanium matrix by adopting a brushing or spraying method, and then sintering to prepare a composite coating anode with a coating firmly and metallurgically bonded with the matrix, wherein the brushing or spraying process is complex, the artificial influence factors are large, the coating is extremely easy to be uneven, colloid is adopted as a binder, and products are easy to be polluted due to incomplete glue discharge or cracking; in addition, when the slurry containing the manganese powder and the titanium powder is prepared for brushing, the titanium powder and the manganese powder are oxidized, so that the oxygen content of the coating material is too high, the purity and the crystallinity of the titanium-manganese alloy coating material are reduced, and the service life of the titanium-manganese alloy coating material is influenced.
Patent CN 101603180a discloses a preparation method of a titanium-manganese alloy coating: in a vacuum furnace, heating manganese powder or manganese blocks loaded in a molybdenum boat by adopting pulse current to obtain manganese vapor, so that the manganese vapor is adsorbed on the surface of a titanium plate and is diffused into the titanium plate to form a Mn-doped layer. Although the titanium-manganese alloy coating prepared by the method has uniform surface, the preparation process is complex and has high requirements on a preparation device; although the method can reduce the pollution of oxygen atoms, when gas phase manganese permeation is adopted, the diffusion mode of gas at high temperature is complex, which can lead to poor adhesive force of the prepared titanium-manganese coating material and reduce the strength of the coating material.
Therefore, there is a need to develop a preparation method of a titanium-manganese alloy coating with tight titanium-manganese combination, high strength, low cost, low impurity content, high crystallinity and simple process.
Disclosure of Invention
The invention aims to provide a preparation method of a titanium-manganese alloy coating, which adopts processes such as electrodeposition, magnetron sputtering, chemical vapor deposition, atomic layer deposition and the like to plate a layer of compact metal Mn film on the surface of a metal Ti sheet, and the Ti sheet with the metal Mn film is placed in a high-temperature furnace for high-temperature annealing treatment, so that metal manganese is uniformly diffused on the surface of the metal titanium, and a titanium-manganese alloy coating material with very tight combination of titanium and manganese is prepared. The method has the advantages of simple process, low cost, short time, low impurity content of the coating material, no pollution in the whole process and easy mass production.
The aim of the invention is achieved by the following technical scheme:
the preparation method of the titanium-manganese alloy coating comprises the following steps:
step 1: sequentially degreasing and polishing the surface of the metal Ti sheet, then etching the surface by acid to increase the roughness of the surface and improve the adhesive force of the metal Mn plating layer, and plating a layer of dense metal Mn film on the surface of the metal Ti sheet by adopting processes such as electrodeposition, magnetron sputtering, chemical vapor deposition, atomic layer deposition and the like, wherein the preparation process is further preferably electrochemical deposition.
Step 2: placing Ti sheet with metal Mn film plated on surface in tubular furnace for high temperature annealing treatment in vacuum and N atmosphere 2 、Ar 2 、NH 3 One of them.
And 3, doping (N, C, S, B) the titanium-manganese alloy coating material to improve the internal crystallization strength of the titanium-manganese alloy coating material and enhance the intermetallic acting force so as to be suitable for more environments.
Preferably, the acid used in step 1 is one or more of oxalic acid, nitric acid and citric acid.
Preferably, the thickness of the metal Mn plating layer prepared by the electrodeposition process in step 1 is 5-25 μm.
Preferably, in step 2, the vacuum level required in the preparation of the titanium manganese coating is 4X 10 -3 ~1×10 -2 Pa, using N 2 、Ar 2 、NH 3 When the pressure is normal pressure.
Preferably, in the step 2, the temperature required in the process of preparing the titanium-manganese coating is 1000-1400 ℃, the annealing time is 0.5-2 h, and the annealing temperature is 1200 ℃ and the annealing time is 2h.
Preferably, in the step 2, the coating thickness of the prepared titanium-manganese alloy coating material is 10-20 mu m, wherein the Mn content is 40-60%.
Preferably, in the step 3, the nitrogen source used for doping the titanium-manganese alloy coating is N 2 、NH 4 Cl、NH 3 One or more of them further select NH 3 As a nitrogen source.
Preferably, in the step 3, the carbon source used for doping the titanium-manganese alloy coating is one or more of methane and ethane, and methane is further selected as the carbon source.
Preferably, in the step 3, the sulfur source used for doping the titanium-manganese alloy coating is one or more of sublimed sulfur, settled sulfur and refined sulfur.
Preferably, in the step 3, the boron source used for doping the titanium-manganese alloy coating is KBF 4 、Fe 2 B, one or two of the following.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the metal Mn plating layer is prepared on the surface of the metal Ti sheet by adopting an electrodeposition process, and a brushing or spraying slurry method is not adopted, so that the prepared titanium-manganese alloy coating is not polluted by an organic solvent, the coating purity is higher, the surface of the coating is compact and flat, and the problem of oxygen atom pollution caused by oxidation of manganese powder when the slurry is used can be avoided.
(2) The invention adopts the high-vacuum solid-phase manganese-permeation process to prepare the titanium-manganese alloy coating, the preparation process is simpler, and compared with the gas-phase manganese-permeation process of pulse current, the invention can save the cost of equipment.
(3) The titanium-manganese alloy coating material is in a high vacuum environment in the process of preparing the titanium-manganese alloy coating, has extremely low oxygen content, further avoids the oxidization problem in the process of preparing the titanium-manganese alloy coating material, and has better purity and crystallinity.
(4) The invention adopts the solid phase infiltration of the metal manganese and the metal titanium to prepare the titanium-manganese alloy coating, the combination between the metal manganese and the titanium is firm, the coating strength is high, and the coating has better mechanical property.
(5) The preparation method has the advantages of simple preparation process, strong operability, short time and low energy consumption, and is easy to implement industrially and realize mass production.
Drawings
Fig. 1 is an SEM image of the titanium-manganese alloy coating obtained in examples 1, 2, and 3, wherein (a) is example 1, (b) is example 2, and (c) is example 3.
Fig. 2 shows XRD patterns of the titanium-manganese alloy coatings obtained in examples 1, 2 and 3, wherein (a) is example 1, (b) is example 2, and (c) is example 3.
Detailed Description
The present invention will be described in further detail with reference to examples, but is not limited to the scope of the invention.
Example 1:
sequentially degreasing and polishing the surface of the metal titanium sheet, and then carrying out surface etching treatment on the polished metal titanium sheet by using 10% hydrofluoric acid (or 4% nitric acid and 12% citric acid). Electroplating a layer of metal manganese on the surface of a metal titanium sheet by adopting an electrochemical deposition process, wherein the electroplating process comprises the following parameters: mn (Mn) 2+ 15g/L,(NH 4 ) 2 SO 4 80g/L, current density 300mA/cm 2 The temperature is 40 ℃ and the electroplating time is 1h, so that the obtained metal manganese coating is 10 mu m. Placing titanium sheet with metal manganese coating in vacuum furnace, and vacuum degree in preparation process is maintained at 4×10 -3 ~1×10 -2 Pa, the annealing temperature is 1100 ℃, the annealing time is 0.5h, and finally the titanium-manganese coating material is obtained.
The scanning electron microscope diagram is shown in fig. 1 (a), and the phase analysis is shown in fig. 2 (a). As can be seen from a scanning electron microscope image and an XRD phase, the prepared titanium-manganese alloy coating material has a relatively flat surface and slightly agglomerated phenomenon, and the phase is mainly Mn 2 Ti, and not detecting the phases of oxides of titanium and manganese, shows that the titanium-manganese alloy material prepared by the process has higher purity and does not contain any impurity. Meanwhile, the mechanical property test is carried out on the titanium-manganese coating material, the Vickers hardness of the titanium-manganese coating material is 390HV, the tensile strength of the coating material is 324Mpa, and the elongation is 28.74%.
Example 2:
sequentially degreasing and polishing the surface of the metal titanium sheet, and then carrying out surface etching treatment on the polished metal titanium sheet by using 10% hydrofluoric acid (or 4% nitric acid and 12% citric acid). Electroplating a layer of metal manganese on the surface of a metal titanium sheet by adopting an electrochemical deposition process, wherein the electroplating process comprises the following parameters: mn (Mn) 2+ 15g/L,(NH 4 ) 2 SO 4 80g/L, current density 300mA/cm 2 The temperature is 40 ℃ and the electroplating time is 1h, so that the obtained metal manganese coating is 10 mu m. Placing titanium sheet with metal manganese coating in vacuum furnace, and vacuum degree in preparation process is maintained at 4×10 -3 Pa~1×10 -2 Pa, annealing temperature of 1100 ℃, annealing timeAnd (3) obtaining the titanium-manganese coating material after 2 hours.
The scanning electron microscope diagram is shown in fig. 1 (b), and the phase analysis is shown in fig. 2 (b). As can be seen from a scanning electron microscope image and an XRD phase, the surface evenness of the prepared titanium-manganese alloy coating material is further improved along with the extension of the annealing time, the agglomeration phenomenon is gradually reduced, and the phase is still Mn 2 Ti, the phase of the oxide of titanium and manganese is not detected at the same time, compared with the annealing for 0.5h in the embodiment 1, the prepared titanium-manganese alloy material has higher peak strength and narrower half-width, which shows that the crystallinity of the titanium-manganese alloy material is enhanced when the annealing time is prolonged, and the strength of the material is improved. The titanium-manganese coating material is subjected to mechanical property test, the Vickers hardness of the titanium-manganese coating material is 442HV, the tensile strength of the coating material is 351Mpa, and the elongation is 23.15%.
Example 3:
sequentially degreasing and polishing the surface of the metal titanium sheet, and then carrying out surface etching treatment on the polished metal titanium sheet by using 10% hydrofluoric acid (or 4% nitric acid and 12% citric acid). Electroplating a layer of metal manganese on the surface of a metal titanium sheet by adopting an electrochemical deposition process, wherein the electroplating process comprises the following parameters: mn (Mn) 2+ 15g/L,(NH 4 ) 2 SO 4 80g/L, current density 300mA/cm 2 The temperature is 40 ℃ and the electroplating time is 1h, so that the obtained metal manganese coating is 10 mu m. Placing titanium sheet with metal manganese coating in vacuum furnace, and vacuum degree in preparation process is maintained at 4×10 -3 ~1×10 -2 Pa, the annealing temperature is 1200 ℃, the annealing time is 2 hours, and finally the titanium-manganese coating material is obtained.
The scanning electron microscope diagram is shown in fig. 1 (c), and the phase analysis is shown in fig. 2 (c). As can be seen from a scanning electron microscope image and an XRD phase, compared with the example 2, the annealing temperature is increased to 1200 ℃, and the surface of the prepared titanium-manganese alloy coating material is compact and smooth, and no agglomeration phenomenon occurs. Still Mn in phase 2 Ti, in which the phases of oxides of titanium and manganese are not detected at the same time, the titanium-manganese alloy materials prepared in example 1 and example 2 have higher peak intensities, narrower half-widths, and further improved crystallinity and strength.
The titanium-manganese coating material is subjected to mechanical property test, the Vickers hardness of the titanium-manganese coating material is 489HV, the tensile strength of the coating material is 421Mpa, the elongation is 17.35%, and the coating material and the substrate are strongly combined.
Example 4:
other conditions are the same as those of example 3, a titanium-manganese alloy coating material is prepared, N permeation treatment is carried out by gas phase nitriding, and a nitrogen source adopts NH 3 The nitriding time is 3h, the nitriding temperature is 850 ℃, the nitrogen-doped titanium-manganese alloy coating material is prepared, the mechanical property test is carried out on the coating material, the Vickers hardness of the coating material is 526HV, the tensile strength of the coating material is 478Mpa, and the elongation is 14.39%.
Example 5:
other conditions were the same as in example 3, a titanium-based titanium-manganese alloy coating material was prepared, which was subjected to N-permeation treatment by gas phase nitriding, nitrogen source was nitrogen gas, nitriding time was 3 hours, nitriding temperature was 850 ℃, a nitrogen-doped titanium-manganese alloy coating material was prepared, and was subjected to mechanical property test, which had a Vickers hardness of 498HV, a tensile strength of 436Mpa, and an elongation of 16.27%. Compared with ammonia gas as nitrogen source, the mechanical property of the titanium-manganese alloy coating is improved less, mainly due to NH 3 The N-H bond energy is lower, and compared with N (identical to that in nitrogen), N in nitrogen is easy to decompose, so that nitrogen atoms are easy to enter into crystal lattices of the titanium-manganese alloy, and the strength of the titanium-manganese alloy coating material is improved.
Example 6:
other conditions were the same as in example 3, a titanium-manganese alloy coating material was prepared, which was subjected to C-cementation by a gas phase carburization method, a methane gas was used as a carbon source, the carburization time was 6 hours, the nitriding temperature was 900 ℃, a carbon-doped titanium-manganese alloy coating material was prepared, and was subjected to a mechanical property test, which had a Vickers hardness of 534HV, a tensile strength of 483MPa, and an elongation of 13.15%.
Example 7:
other conditions were the same as in example 3, a titanium-manganese alloy coating material was prepared, which was subjected to C-permeation treatment by a gas phase carburizing method, an ethane gas was used as a carbon source, a carburizing time was 6 hours, a carburizing temperature was 900 ℃, a carbon-doped titanium-manganese alloy coating material was prepared, and was subjected to a mechanical property test, which had a vickers hardness of 529HV, a tensile strength of 471Mpa, and an elongation of 14.12%. Compared with ethane gas as a carbon source, the mechanical property of the titanium-manganese alloy coating is improved less, mainly because methane is easier to crack compared with hydrocarbon bonds of ethane, in addition, carbon in the ethane exists in a C-C bond form, the bond energy is higher, and the carbon atom is not easy to deviate from.
Example 8:
other conditions were the same as in example 3, a titanium-manganese alloy coating material was prepared, the coating material was subjected to S-permeation treatment by a solid-phase embedding method, a sulfur source was subjected to sublimation sulfur, the sulfur permeation time was 4 hours, the sulfur permeation temperature was 750 ℃, a sulfur-doped titanium-manganese alloy coating material was prepared, and the coating material was subjected to mechanical property test, the Vickers hardness was 516HV, the tensile strength of the coating material was 475Mpa, and the elongation was 13.43%.
Example 9:
other conditions were the same as in example 3, a titanium-manganese alloy coating material was prepared, S-permeation treatment was performed by a solid-phase embedding method, a sulfur source was precipitated sulfur, the sulfur permeation time was 4 hours, the sulfur permeation temperature was 750 ℃, a sulfur-doped titanium-manganese alloy coating material was prepared, and a mechanical property test was performed on the titanium-manganese alloy coating material, the Vickers hardness was 518HV, the tensile strength of the coating material was 479Mpa, and the elongation was 13.41%
Example 10:
other conditions were the same as in example 3, a titanium-based titanium-manganese alloy coating material was prepared, the coating material was subjected to S permeation treatment by a solid-phase embedding method, a sulfur source was subjected to refined sulfur permeation for 4 hours at a temperature of 750 ℃ to prepare a sulfur-doped titanium-manganese alloy coating material, and the coating material was subjected to mechanical property test, and had a Vickers hardness of 514HV, a tensile strength of 470Mpa and an elongation of 13.42%.
Example 11:
other conditions are the same as those of example 3, a titanium-manganese alloy coating material is prepared, B infiltration treatment is carried out by adopting a solid-phase embedding method, and a boron source adopts KBF 4 Preparing boron-doped titanium-manganese alloy coating material with a sulfurizing time of 4h and a sulfurizing temperature of 950 ℃, and carrying out mechanical property test on the coating material, wherein the Vickers hardness of the coating material is 526HVThe tensile strength of the material is 475Mpa, and the elongation is 15.43%.
Example 12:
other conditions are the same as those of example 3, a titanium-manganese alloy coating material is prepared, B infiltration treatment is carried out by adopting a solid-phase embedding method, and a boron source adopts Fe 2 B, the sulfurizing time is 4 hours, the sulfurizing temperature is 950 ℃, the boron-doped titanium-manganese alloy coating material is prepared, the mechanical property test is carried out on the boron-doped titanium-manganese alloy coating material, the Vickers hardness of the boron-doped titanium-manganese alloy coating material is 519HV, the tensile strength of the coating material is 473Mpa, and the elongation is 15.64%.

Claims (8)

1. The preparation method of the titanium-manganese alloy coating is characterized by comprising the following steps of:
step 1: pretreatment is carried out on the Ti surface;
step 2: preparing a metal Mn film on the pretreated Ti surface by an electrochemical deposition method;
step 3: carrying out high-temperature heat treatment on the titanium sheet with the metal Mn film plated on the surface in a certain atmosphere to enable the metal Mn and Ti to mutually infiltrate and form a titanium-manganese alloy coating;
wherein the heat treatment atmosphere in the step 3 is vacuum or N 2 、Ar、NH 3 One of the following; when a vacuum atmosphere is adopted, the vacuum degree is 4 multiplied by 10 -3 ~1×10 -2 Pa, using N 2 、Ar、NH 3 When the pressure is normal pressure, the atmosphere is N 2 、Ar、NH 3 Wherein one gas atmosphere or a mixed atmosphere of at least one gas; the heat treatment temperature in the step 3 is 1000-1400 ℃, and the heat treatment time is 0.5-2 h.
2. The method for preparing the titanium-manganese alloy coating according to claim 1, which is characterized in that: and step 1, sequentially degreasing, polishing and then etching the surface of the metal Ti sheet by using acid, wherein the etching agent adopted in the etching process is one or more of hydrofluoric acid, oxalic acid, nitric acid and citric acid.
3. The method for preparing the titanium-manganese alloy coating according to claim 1 or 2, characterized in that: in the step 2, the thickness of the metal Mn film is 5-25 μm.
4. The method for preparing the titanium-manganese alloy coating according to claim 1, which is characterized in that: and carrying out doping modification treatment on the prepared titanium-manganese alloy coating, wherein the doping element is at least one of N, C, S, B.
5. The method for preparing the titanium-manganese alloy coating according to claim 4, which is characterized in that: when the doping element is N, the nitrogen source is N 2 、NH 4 Cl、NH 3 At least one of them.
6. The method for preparing the titanium-manganese alloy coating according to claim 4, which is characterized in that: when the doping element is C, the carbon source is one or two of methane and ethane.
7. The method for preparing the titanium-manganese alloy coating according to claim 4, which is characterized in that: when the doping element is S, the sulfur source is one or more of sublimated sulfur, settled sulfur and refined sulfur.
8. The method for preparing the titanium-manganese alloy coating according to claim 4, which is characterized in that: when the doping element is B, the boron source is KBF 4 、Fe 2 B, one or two of the following.
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