CN114293039B - Preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying - Google Patents
Preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying Download PDFInfo
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Abstract
The invention discloses a preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying, which is characterized in that a resistance furnace is used for smelting and preparing Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy, an induction smelting furnace is used for smelting and preparing Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy, and an extrusion and 7-pass rolling process is adopted to prepare Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy wire with the diameter of 3 mm. The invention has the advantages that: on one hand, a small amount of Mg element is added into the Zn-Cu-Ti alloy to improve the corrosion resistance of the alloy, and on the other hand, the problem that the Zn-Cu-Ti alloy wire is difficult to industrialize is solved.
Description
Technical Field
The invention relates to the technical field of alloy and thermal spraying materials, in particular to a preparation method of a Zn-Cu-Ti-Mg alloy for thermal spraying.
Background
Along with the development of bridge industry, the bridge steel structure can be applied to coastal areas with severe environment and cold areas with low air temperature, or bridges with larger span requirements. The bridge steel structure can bear dynamic load and static load all the time and can work in a wind, rain and humid environment for a long time. The steel is easy to be damaged in various forms such as stress, fatigue, corrosion and the like, so that the material fails and the bridge structure is damaged. Safety accidents or economic losses may be caused. Therefore, the improvement of the corrosion resistance of the bridge steel structure has important significance on the construction of bridge cables. The method is a common method for improving the corrosion resistance of a plated part by thermally spraying a layer of metal or alloy on the surface of a steel structure, wherein the plated metal or alloy can be firmly combined with a matrix. The Zn-Al alloy coating is widely applied by the advantages of low economic cost, high corrosion resistance, good mechanical property, good coating property and the like. However, the corrosion point of the Zn-Al alloy coating is more positive than that of Fe due to the Al oxide film, the electrode reversion often occurs to Al and Fe, and the coating has different degrees of cavitation corrosion, so that the corrosion resistance of the coating is influenced.
The Zn-Cu-Ti alloy has excellent comprehensive performance, low economic cost and excellent corrosion resistance, and is widely applied to the fields of electronic devices, automobile manufacture, articles for daily use, anticorrosive coatings and the like. After Mg is used as an alloy element and enters the Zn-Cu-Ti alloy, intergranular corrosion can be obviously reduced, and the corrosion resistance of the Zn-Cu-Ti alloy is improved. Compared with Zn-Al alloy wires, the preparation technology of the Zn-Cu-Ti alloy wires is not mature enough, and the wide application of the Zn-Cu-Ti alloy wires in the field of thermal spraying is seriously hindered. Therefore, it is necessary to develop a Zn-Cu-Ti-Mg alloy wire for thermal spraying having better industrial performance and to master the manufacturing process of the Zn-Cu-Ti-Mg alloy wire.
Disclosure of Invention
In order to solve the various problems, the invention provides a preparation method of a Zn-Cu-Ti-Mg alloy for thermal spraying, on one hand, the corrosion resistance of the Zn-Cu-Ti alloy coating for thermal spraying is further improved by using a Zn-Cu-Ti alloy coating containing Mg; on the other hand, the problem that the Zn-Cu-Ti alloy wire is difficult to industrialize is solved.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying comprises the following preparation steps:
the method comprises the following steps: pure zinc, pure copper, sponge titanium and pure magnesium are used as raw materials, a resistance furnace is adopted for smelting to prepare Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy, the temperature is kept at 620 ℃ for 3h for smelting to prepare the Zn-5Mg intermediate alloy, the temperature is kept at 650 ℃ for 5h to prepare the Zn-10Cu intermediate alloy, and the temperature is kept at 700 ℃ to 750 ℃ for 6h to prepare the Zn-3Ti intermediate alloy;
step two: pure Zn, Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy are used as raw materials, an induction smelting furnace is adopted for smelting and preparing Zn-Cu-Ti-Mg alloy, during the smelting process, a Zn-0.75Cu-0.15Ti alloy melt is prepared firstly, then the Zn-5Mg intermediate alloy is added into the alloy melt, the temperature is kept for 30min, then the alloy melt is poured into a cast iron cavity to obtain a bar-shaped cast ingot with the diameter of 115mm, and after the cast ingot is cooled, surface oxide skin is removed, and finally the cast ingot with the diameter of 114mm is obtained;
step three: the Zn-Cu-Ti-Mg alloy cast ingot with the diameter of 114mm is extruded into an alloy rod with the diameter of 9.5mm by an extruder, and the extrusion process comprises the following steps: heating the cast ingot, and then quickly transferring the cast ingot into an extrusion cylinder for extrusion;
step four: rolling a Zn-Cu-Ti-Mg alloy rod with the diameter of 9.5mm into an alloy wire with the diameter of 3mm by adopting a 7-pass rolling process, wherein the rolling process comprises the following steps: the change of the diameter of the alloy wire is 9mm-7.2mm-6.4mm-5.6mm-4.8mm-4.2mm-3.6mm-3 mm.
Preferably, the smelting temperature of the Zn-Cu-Ti-Mg alloy in the second step is 620-680 ℃.
Preferably, the Zn-Cu-Ti-Mg alloy in the second step has the composition of Zn-0.75Cu-0.15Ti-0.1Mg or Zn-0.75Cu-0.15Ti-0.2 Mg.
Preferably, the extrusion temperature of the Zn-Cu-Ti-Mg alloy in the third step is 390 +/-5 ℃.
Preferably, the extrusion speed of the Zn-Cu-Ti-Mg alloy in the third step is 0.8-1.2mm/s, and the extrusion ratio is 144: 1.
Preferably, the rolling temperature of the Zn-Cu-Ti-Mg alloy wire rod in the fourth step is 210 +/-10 ℃ when the wire diameter is from 9mm to 4.2mm, and the rolling speed is 12 +/-2 mm/s.
Preferably, the rolling temperature of the Zn-Cu-Ti-Mg alloy wire rod in the fourth step is 130 +/-10 ℃ when the wire diameter is from 4.2mm to 3mm, and the rolling speed is 25 +/-3 mm/s.
Compared with the prior art, the invention has the advantages that: the preparation method provided by the invention comprises the steps of preparing Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloys by resistance furnace smelting, preparing Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloys by induction smelting furnace smelting, and preparing Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy wires with the diameter of 3mm by adopting an extrusion and 7-pass rolling process. On one hand, a small amount of Mg element is added into the Zn-Cu-Ti alloy to improve the corrosion resistance of the alloy, and on the other hand, the problem that the Zn-Cu-Ti alloy wire is difficult to industrialize is solved.
Drawings
FIG. 1 shows the structure of the extruded Zn-0.75Cu-0.15Ti-0.1Mg alloy of the present invention.
FIG. 2 shows the structure and morphology of the extruded Zn-0.75Cu-0.15Ti-0.2Mg alloy of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
A preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying comprises the following steps:
(1) pure zinc, pure copper, sponge titanium and pure magnesium are used as raw materials, a resistance furnace is adopted for smelting to prepare Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy, the temperature is kept at 620 ℃ for 3h for smelting to prepare the Zn-5Mg intermediate alloy, the temperature is kept at 650 ℃ for 5h to prepare the Zn-10Cu intermediate alloy, and the temperature is kept at 700 ℃ to 750 ℃ for 6h to prepare the Zn-3Ti intermediate alloy.
(2) Pure Zn, Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy are used as raw materials, an induction smelting furnace is adopted to smelt and prepare Zn-0.75Cu-0.15Ti-0.1Mg alloy, the smelting temperature is controlled to be 620-680 ℃, in the smelting process, a Zn-0.75Cu-0.15Ti alloy melt is firstly prepared, then the Zn-5Mg intermediate alloy is added into the alloy melt and is kept for 30min, then the alloy melt is poured into a cast iron cavity to obtain a rod-shaped ingot with the diameter of 115mm, and after the ingot is cooled, a surface oxide skin is removed, and finally the ingot with the diameter of 114mm is obtained.
(3) A Zn-0.75Cu-0.15Ti-0.1Mg alloy cast ingot with the diameter of 114mm is extruded into an alloy rod with the diameter of 9.5mm on an extruder, and the extrusion process comprises the following steps: heating the cast ingot to 390 +/-5 ℃, and then quickly transferring the cast ingot into an extrusion cylinder, wherein the extrusion speed is 0.8-1.2mm/s, and the extrusion ratio is 144: 1.
(4) Rolling a 9.5mm Zn-0.75Cu-0.15Ti-0.1Mg alloy rod into an alloy wire with the diameter of 3mm by adopting a 7-pass rolling process, wherein the rolling process comprises the following steps: the change of the diameter of the alloy wire is 9mm-7.2mm-6.4mm-5.6mm-4.8mm-4.2mm-3.6mm-3mm, the wire temperature is 210 +/-10 ℃ in the change process from 9mm to 4.2mm, the speed of the wire feeding speed is 12 +/-2 mm/s, the heating temperature of the wire is 130 +/-10 ℃ in the change process from 4.2mm to 3mm, and the speed of the wire feeding speed is 25 +/-3 mm/s.
Example 2
A preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying comprises the following steps:
(1) pure zinc, pure copper, sponge titanium and pure magnesium are used as raw materials, a resistance furnace is adopted for smelting to prepare Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy, the temperature is kept at 620 ℃ for 3h for smelting to prepare the Zn-5Mg intermediate alloy, the temperature is kept at 650 ℃ for 5h to prepare the Zn-10Cu intermediate alloy, and the temperature is kept at 700 ℃ to 750 ℃ for 6h to prepare the Zn-3Ti intermediate alloy.
(2) Pure Zn, Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy are used as raw materials, an induction smelting furnace is adopted to smelt and prepare Zn-0.75Cu-0.15Ti-0.2Mg alloy, the smelting temperature is controlled to be 620-680 ℃, during the smelting process, a Zn-0.75Cu-0.15Ti alloy melt is prepared firstly, then the Zn-5Mg intermediate alloy is added into the alloy melt and is kept warm for 30min, then the alloy melt is poured into a cast iron cavity to obtain a bar-shaped ingot with the diameter of 115mm, and after the ingot is cooled, a surface oxide skin is removed, and finally the ingot with the diameter of 114mm is obtained.
(3) A Zn-0.75Cu-0.15Ti-0.2Mg alloy cast ingot with the diameter of 114mm is extruded into an alloy rod with the diameter of 9.5mm on an extruder, and the extrusion process comprises the following steps: heating the cast ingot to 390 +/-5 ℃, and then quickly transferring the cast ingot into an extrusion cylinder, wherein the extrusion speed is 0.8-1.2mm/s, and the extrusion ratio is 144: 1.
(4) Rolling a 9.5mm Zn-0.75Cu-0.15Ti-0.2Mg alloy rod into an alloy wire with the diameter of 3mm by adopting a 7-pass rolling process, wherein the rolling process comprises the following steps: the variation of the diameter of the alloy wire is 9mm-7.2mm-6.4mm-5.6mm-4.8mm-4.2mm-3.6mm-3mm, the wire temperature is 210 +/-10 ℃ in the variation process from 9mm to 4.2mm, the wire feeding speed is 12 +/-2 mm/s, the wire heating temperature is 130 +/-10 ℃ in the variation process from 4.2mm to 3mm, and the wire feeding speed is 25 +/-3 mm/s.
Example 3
A preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying comprises the following steps:
(1) pure zinc, pure copper, sponge titanium and pure magnesium are used as raw materials, a resistance furnace is adopted for smelting to prepare Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy, the temperature is kept at 620 ℃ for 3h for smelting to prepare the Zn-5Mg intermediate alloy, the temperature is kept at 650 ℃ for 5h to prepare the Zn-10Cu intermediate alloy, and the temperature is kept at 700 ℃ to 750 ℃ for 6h to prepare the Zn-3Ti intermediate alloy.
(2) Pure Zn, Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy are used as raw materials, an induction smelting furnace is adopted to smelt and prepare Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy, the smelting temperature is controlled to be between 620 and 680 ℃, during the smelting process, a Zn-0.75Cu-0.15Ti alloy melt is prepared firstly, then the Zn-5Mg intermediate alloy is added into the alloy melt, the temperature is kept for 30min, then the alloy melt is poured into a cast iron cavity to obtain a bar-shaped cast ingot with the diameter of 115mm, the surface oxide skin of the cast ingot is removed after the cast ingot is cooled, and finally the cast ingot with the diameter of 114mm is obtained.
(3) Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy ingots with the diameter of 114mm are extruded into alloy rods with the diameter of 9.5mm on an extruder, and the extrusion process comprises the following steps: the ingot was heated to 390 ℃. + -. 5 ℃ and then rapidly transferred to an extrusion cylinder at an extrusion rate of 0.8mm/s and an extrusion ratio of 144: 1.
(4) Rolling a 9.5mm Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy rod into an alloy wire with the diameter of 3mm by adopting a 7-pass rolling process, wherein the rolling process comprises the following steps: the change of the diameter of the alloy wire is 9mm-7.2mm-6.4mm-5.6mm-4.8mm-4.2mm-3.6mm-3mm, the wire temperature is 210 +/-10 ℃ in the change process from 9mm to 4.2mm, the speed of the wire feeding speed is 12 +/-2 mm/s, the heating temperature of the wire is 130 +/-10 ℃ in the change process from 4.2mm to 3mm, and the speed of the wire feeding speed is 25 +/-3 mm/s.
Example 4
A preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying comprises the following steps:
(1) pure zinc, pure copper, sponge titanium and pure magnesium are used as raw materials, a resistance furnace is adopted for smelting to prepare Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy, the temperature is kept at 620 ℃ for 3h for smelting to prepare the Zn-5Mg intermediate alloy, the temperature is kept at 650 ℃ for 5h to prepare the Zn-10Cu intermediate alloy, and the temperature is kept at 700 ℃ to 750 ℃ for 6h to prepare the Zn-3Ti intermediate alloy.
(2) Pure Zn, Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloys are used as raw materials, an induction smelting furnace is adopted to smelt and prepare Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy, the smelting temperature is controlled to be 620-680 ℃, in the smelting process, a Zn-0.75Cu-0.15Ti alloy melt is firstly prepared, then the Zn-5Mg intermediate alloy is added into the alloy melt, the temperature is kept for 30min, then the alloy melt is poured into a cast iron cavity to obtain a bar-shaped ingot with the diameter of 115mm, and after the ingot is cooled, a surface oxide skin is removed, and finally the ingot with the diameter of 114mm is obtained.
(3) The Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy cast ingot with the diameter of 114mm is extruded into an alloy rod with the diameter of 9.5mm on an extruder, and the extrusion process comprises the following steps: the ingot was heated to 390 ℃. + -. 5 ℃ and then rapidly transferred to an extrusion cylinder at an extrusion speed of 1.2mm/s and an extrusion ratio of 144: 1.
(4) Rolling a 9.5mm Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy rod into an alloy wire with the diameter of 3mm by adopting a 7-pass rolling process, wherein the rolling process comprises the following steps: the variation of the diameter of the alloy wire is 9mm-7.2mm-6.4mm-5.6mm-4.8mm-4.2mm-3.6mm-3mm, the wire temperature is 210 +/-10 ℃ in the variation process from 9mm to 4.2mm, the wire feeding speed is 12 +/-2 mm/s, the wire heating temperature is 130 +/-10 ℃ in the variation process from 4.2mm to 3mm, and the wire feeding speed is 25 +/-3 mm/s.
The prepared Zn-0.75Cu-0.15Ti- (0.1-0.2) Mg alloy for hot dip coating was subjected to a structural property test with reference to FIGS. 1 and 2, and the results are shown in Table 1.
TABLE 1
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should be able to conceive of the present invention without creative design of the similar structural modes and embodiments without departing from the spirit of the present invention, and all such modifications should fall within the protection scope of the present invention.
Claims (7)
1. A preparation method of Zn-Cu-Ti-Mg alloy for thermal spraying is characterized by comprising the following preparation steps:
the method comprises the following steps: pure zinc, pure copper, sponge titanium and pure magnesium are used as raw materials, a resistance furnace is adopted for smelting to prepare Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy, the temperature is kept at 620 ℃ for 3h for smelting to prepare the Zn-5Mg intermediate alloy, the temperature is kept at 650 ℃ for 5h to prepare the Zn-10Cu intermediate alloy, and the temperature is kept at 700 ℃ to 750 ℃ for 6h to prepare the Zn-3Ti intermediate alloy;
step two: pure Zn, Zn-10Cu, Zn-3Ti and Zn-5Mg intermediate alloy are used as raw materials, an induction smelting furnace is adopted for smelting and preparing Zn-Cu-Ti-Mg alloy, during the smelting process, a Zn-0.75Cu-0.15Ti alloy melt is prepared firstly, then the Zn-5Mg intermediate alloy is added into the alloy melt, the temperature is kept for 30min, then the alloy melt is poured into a cast iron cavity to obtain a bar-shaped cast ingot with the diameter of 115mm, and after the cast ingot is cooled, surface oxide skin is removed, and finally the cast ingot with the diameter of 114mm is obtained;
step three: the Zn-Cu-Ti-Mg alloy cast ingot with the diameter of 114mm is extruded into an alloy rod with the diameter of 9.5mm by an extruder, and the extrusion process comprises the following steps: heating the cast ingot, and then quickly transferring the cast ingot into an extrusion cylinder for extrusion;
step four: rolling a Zn-Cu-Ti-Mg alloy rod with the diameter of 9.5mm into an alloy wire with the diameter of 3mm by adopting a 7-pass rolling process, wherein the rolling process comprises the following steps: the change of the diameter of the alloy wire is 9mm-7.2mm-6.4mm-5.6mm-4.8mm-4.2mm-3.6mm-3 mm.
2. The method for preparing a Zn-Cu-Ti-Mg alloy for thermal spraying according to claim 1, wherein: the smelting temperature of the Zn-Cu-Ti-Mg alloy in the second step is 620-680 ℃.
3. The method for preparing a Zn-Cu-Ti-Mg alloy for thermal spraying according to claim 1, wherein: the Zn-Cu-Ti-Mg alloy in the second step comprises Zn-0.75Cu-0.15Ti-0.1Mg or Zn-0.75Cu-0.15Ti-0.2 Mg.
4. The method for preparing a Zn-Cu-Ti-Mg alloy for thermal spraying according to claim 1, wherein: the extrusion temperature of the Zn-Cu-Ti-Mg alloy in the third step is 390 +/-5 ℃.
5. The method for preparing a Zn-Cu-Ti-Mg alloy for thermal spraying according to claim 1, wherein: in the third step, the extrusion speed of the Zn-Cu-Ti-Mg alloy is 0.8-1.2mm/s, and the extrusion ratio is 144: 1.
6. The method for preparing a Zn-Cu-Ti-Mg alloy for thermal spraying according to claim 1, wherein: the rolling temperature of the Zn-Cu-Ti-Mg alloy wire rod in the fourth step is 210 +/-10 ℃ when the wire diameter is from 9mm to 4.2mm, and the rolling speed is 12 +/-2 mm/s.
7. The method for preparing a Zn-Cu-Ti-Mg alloy for thermal spraying according to claim 1, wherein: and in the fourth step, the rolling temperature is 130 +/-10 ℃ and the rolling speed is 25 +/-3 mm/s when the wire diameter of the Zn-Cu-Ti-Mg alloy wire rod is from 4.2mm to 3 mm.
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