CN117758180B - Preparation method of flat steel wire for wiper arm framework structure and flat steel wire - Google Patents
Preparation method of flat steel wire for wiper arm framework structure and flat steel wire Download PDFInfo
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- CN117758180B CN117758180B CN202311800272.5A CN202311800272A CN117758180B CN 117758180 B CN117758180 B CN 117758180B CN 202311800272 A CN202311800272 A CN 202311800272A CN 117758180 B CN117758180 B CN 117758180B
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Abstract
The preparation method of the flat steel wire for the wiper arm framework structure comprises the steps of preheating a bright round steel wire in a reducing atmosphere, immersing the preheated round steel wire in molten zinc liquid in the reducing atmosphere for protection, carrying out first dip plating on the round steel wire to sequentially wrap a zinc-iron alloy transition layer and a pure zinc coating outside the round steel wire, carrying out first cooling for 2.5-5 seconds, and then sequentially carrying out drawing and continuous rolling to obtain the flat steel wire wrapped with the zinc-iron alloy transition layer and the pure zinc coating; or after the first cooling, continuously plating zinc-aluminum alloy coating for 2.5-5 seconds to obtain the flat steel wire comprising zinc-ferrum alloy transition layer and zinc-aluminum alloy coating. The design has the advantages that the hot dip time is shorter, the thickness of the hot dip layer is thinner, and the coating is not easy to burst or fall off during deformation processing, so that the flat steel wire for the wiper arm framework structure is beneficial to developing towards the direction of low cost and high corrosion resistance.
Description
Technical Field
The invention relates to a flat steel wire, belongs to the field of metal composite materials, and particularly relates to a preparation method of the flat steel wire for a wiper arm framework structure and the flat steel wire.
Background
The wiper arm is a component of the automobile windshield wiper system, wherein the wiper is connected with the swing motor, and the wiper arm component has direct influence on the service performance, the whole weight, the service life and the like of the wiper system. With the rapid development of the automobile industry, especially new energy automobiles, the development of the wiper arm as a main structural component of a wiper system is more and more towards low cost, long service life and light weight, and the material used as a framework structure of the wiper arm is required to ensure the strength of the whole structure of the wiper arm, and has excellent corrosion resistance, lower cost and lighter weight.
Currently, a framework structure material for a wiper arm mainly comprises: stainless steel flat wires, the surfaces of which are not plated; a electrogalvanized coating is arranged on the surface of the carbon steel flat wire;
The framework structure material for the wiper arm, which is made of the stainless steel flat wire, has good corrosion resistance, but has high comprehensive cost, and is not beneficial to the trend of development of the wiper arm in the low-cost direction; the carbon steel flat wire framework material with the electrogalvanized coating on the surface is characterized in that a zinc metal film is attached to the surface of the medium-high carbon steel through an electrodeposition chemical reaction, so that the effect of preventing the corrosion of a matrix is achieved, no transition layer is arranged between the electroplated zinc layer and the carbon steel matrix for protection, the coating adhesive force is not strong, when the carbon steel flat wire framework material is used, the zinc layer is easy to fall off, and the carbon steel matrix can be directly exposed to the air, so that the corrosion is caused, and the service life is seriously influenced.
For this purpose, the prior art proposes the design of hot dip zinc coating on the surface of carbon steel. The diameter range of the corresponding round steel wire for galvanizing is generally 7.0mm-9.0mm, but according to the current traditional hot dip plating method, the plating layer with stable and compact surface, no plating leakage, smoothness and no burrs is obtained, the immersion time is 20-30 seconds, and the thickness of the formed hot dip plating layer is more than 48 microns. The plating layer is obviously too thick, and the plasticity, particularly the extensibility of the plating layer is not as good as that of a steel wire matrix, so that when the rolling forming or flat steel wire bending processing is carried out, the phenomenon that a zinc layer bursts or falls off easily along with the increase of the deformation during the processing, and the appearance and the corrosion resistance of a product are seriously affected.
The disclosure of this background section is only intended to increase the understanding of the general background of the application and should not be taken as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defects and problems of thicker hot-dip coating layer and easy damage in deformation processing in the prior art, and provides a preparation method of a flat steel wire for a wiper arm framework structure, and the flat steel wire.
In order to achieve the above object, the technical solution of the present invention is: the preparation method of the flat steel wire for the wiper arm framework structure comprises the following steps:
The first step: firstly selecting a round steel wire with a corresponding diameter, carrying out surface treatment on the round steel wire to obtain a bright round steel wire, preheating the bright round steel wire in a reducing atmosphere, immersing the preheated round steel wire in molten zinc liquid in the reducing atmosphere protection, carrying out first dip plating on the round steel wire to sequentially wrap a zinc-ferrum alloy transition layer and a pure zinc coating outside the round steel wire, wherein the time of the first dip plating is 2.5-5 seconds, and then carrying out first cooling on the round steel wire subjected to dip plating by normal-temperature water;
and a second step of: drawing the cooled round steel wire by using a round cavity die to obtain a thin round steel wire with a required diameter, and continuously rolling the thin round steel wire to obtain a flat steel wire with a required size.
In the first step, the thickness of the zinc-iron alloy transition layer is less than 10um, and the thickness of the pure zinc plating layer is less than 20um.
In the first step, the preheating temperature is 450-460 ℃, and the temperature of the zinc liquid is 450-460 ℃.
In the first step, after the first cooling is finished, immersing the round steel wire with the zinc-iron alloy transition layer and the pure zinc coating into molten zinc-aluminum alloy liquid to carry out the second immersion plating, so as to sequentially wrap the zinc-iron alloy transition layer and the zinc-aluminum alloy coating outside the round steel wire, wherein the second immersion plating time is 2.5-5 seconds, and then carrying out the second cooling on the immersed round steel wire by normal-temperature water;
in the second step, the cooled round wire refers to a round wire after being cooled for the second time.
In the first step, the temperature of the zinc-aluminum alloy liquid is 450-460 ℃, the mass percentage concentration of aluminum in the zinc-aluminum alloy liquid is 5-10%, and the balance is zinc.
After the first dip plating and the second dip plating are finished, the surface of the round steel wire after the zinc liquid or the zinc-aluminum alloy liquid is wiped by using 99.99% high-purity nitrogen, and then the round steel wire is rapidly cooled by using warm water so as to cool the temperature of the round steel wire to 80-120 ℃.
In the first step, the thickness of the zinc-iron alloy transition layer is less than 10um, and the thickness of the zinc-aluminum alloy coating is less than 20um.
In the first step, the metallographic structure of the round steel wire with the corresponding diameter is a sorbite structure, the sorbite rate is more than 95%, and the tensile strength is 800-900 Mpa.
The flat steel wire is manufactured by adopting the manufacturing method, is of a layered structure and sequentially comprises a steel wire base layer, a zinc-iron alloy transition layer and a pure zinc plating layer from inside to outside.
The flat steel wire is manufactured by adopting the manufacturing method, is of a layered structure and sequentially comprises a steel wire base layer, a zinc-iron alloy transition layer and a zinc-aluminum alloy coating from inside to outside.
Compared with the prior art, the invention has the beneficial effects that:
1. The invention relates to a preparation method of a flat steel wire for a wiper arm framework structure and a flat steel wire, wherein a round steel wire with a corresponding diameter is firstly selected, then the round steel wire is subjected to surface treatment to obtain a bright round steel wire, then the bright round steel wire is preheated (preferably for 3-4 seconds) in a reducing atmosphere, the preheated round steel wire is immersed into molten zinc liquid in the reducing atmosphere for protection, then the round steel wire is subjected to first dip plating by the zinc liquid to sequentially wrap a zinc-iron alloy transition layer and a pure zinc plating layer outside the round steel wire, the time of the first dip plating is 2.5-5 seconds, and then the round steel wire is sequentially subjected to drawing and rolling after being cooled to obtain the flat steel wire with a required size; advantages of this design include:
First point: the design can finish hot-dip coating within 2.5-5 seconds, and a coating with stable and compact surface, no plating leakage, smoothness and no burrs is generated, the whole hot-dip coating time is greatly reduced, and the coating with thinner thickness is beneficial to obtaining, for example, the thickness of a zinc-iron alloy transition layer is less than 10 mu m, and the thickness of a pure zinc coating is less than 20 mu m, so that the coating is not damaged due to thicker coating in the subsequent deformation processing process, such as rolling forming, and various processing procedures such as bending processing and the like which are continuously carried out after flat steel wire forming;
Second point: the design can finish hot dip coating within 2.5-5 seconds, has short time, can prevent iron elements on the surface of the round steel wire from being greatly diffused into zinc liquid, forms intermetallic compounds to sink into the bottom of a zinc pot and forms zinc slag, so that the zinc slag quantity is obviously reduced, the production cost is reduced, and the development requirements of environmental protection and low carbon are met;
Third point: after the round steel wire is preheated, the temperature of the round steel wire is similar to that of the molten zinc, so that the reaction rate between zinc and ferrum can be accelerated, a zinc-ferrum alloy transition layer can be generated quickly, and the total dip plating time is reduced;
fourth point: the round steel wire in the design is bright when being dip-plated, the technology limits that the surface of the round steel wire is free of oxidation, dirt, dust and other impurities, so that the two elements of zinc and ferrum can directly contact and react as soon as the round steel wire is immersed in a zinc pot, interference is avoided, a zinc-ferrum alloy transition layer can be generated more easily and rapidly, and the total dip-plating time is reduced;
Therefore, the invention has the advantages of short hot-dip time and thinner hot-dip coating thickness, can ensure that the coating is not easy to burst or fall off in the subsequent deformation processing process, is beneficial to reducing the production cost, improving the corrosion resistance of the product and further prolonging the service life.
2. In the preparation method of the flat steel wire for the wiper arm framework structure and the flat steel wire, the round steel wire is preheated and protected by adopting a reducing atmosphere (such as hydrogen or carbon monoxide) in the whole process before entering zinc liquid after preheating, and the design has the advantages that:
first point: impurities such as oxide skin generated on the front surface of the round steel wire entering the zinc liquid after preheating can be avoided, the brightness degree of the surface of the round steel wire is reduced, and the hot dip coating effect is poor;
Second point: if the residual oxide skin of the round steel wire subjected to surface treatment is not removed completely, the residual oxide skin can be changed into elemental iron by reducing gas, which is extremely beneficial to the hot-dip coating process and is beneficial to generating a high-quality hot-dip coating;
therefore, the invention not only can keep the brightness degree of the round steel wire surface, but also is beneficial to the generation of high-quality hot-dip coating.
3. According to the preparation method of the flat steel wire for the wiper arm framework structure and the flat steel wire, the metallographic structure of the round steel wire with the corresponding diameter is a sorbite structure, the sorbite rate is more than 95%, the tensile strength is 800-900 Mpa, and the design can ensure the basic mechanical strength of the round steel wire so as to support the smooth proceeding of subsequent drawing and rolling, so that the mechanical property requirement of a finished product is met. In addition, the sorbite rate and the tensile strength are limited, the detection efficiency can be improved, the metallographic structure is a sorbite structure, the sorbite rate is more than 95%, the corresponding round steel wire strength range is basically 800-900 Mpa, the metallographic structure detection time is relatively long, the tensile strength of the round steel wire is more convenient to detect in the actual production process, and the detection efficiency is greatly improved. Therefore, the invention can ensure the mechanical strength of the flat steel wire and ensure that the flat steel wire is produced smoothly.
4. According to the preparation method of the flat steel wire for the wiper arm framework structure and the flat steel wire, two types of finally manufactured flat steel wires are of layered structures, one type of flat steel wire sequentially comprises a steel wire base layer, a zinc-iron alloy transition layer and a pure zinc coating from inside to outside, the other type of flat steel wire comprises a steel wire base layer, a zinc-iron alloy transition layer and a zinc-aluminum alloy coating from inside to outside, and the flat steel wire has multi-layer protection, so that the corrosion resistance of a product can be improved. Therefore, the invention has better corrosion resistance.
Drawings
Fig. 1 is a schematic view of the structure of a first flat wire made in accordance with the present invention.
Fig. 2 is a schematic structural view of a second flat wire manufactured by the present invention.
FIG. 3 is a scanning electron microscope image of a cross-sectional coating layer of a round wire after hot-dip coating in example 1 of the present invention.
Fig. 4 is a scanning electron microscope image of the cross-sectional coating of the final flat wire in example 1 of the present invention.
FIG. 5 is a scanning electron microscope image of the cross-sectional plating layer of the round wire after hot-dip coating in example 2 of the present invention.
Fig. 6 is a scanning electron microscope image of a cross-sectional coating of a final flat wire in example 2 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 6, a method for preparing a flat steel wire for a wiper arm skeleton structure includes the steps of:
The first step: firstly selecting a round steel wire with a corresponding diameter, carrying out surface treatment on the round steel wire to obtain a bright round steel wire, preheating the bright round steel wire in a reducing atmosphere, immersing the preheated round steel wire in molten zinc liquid in the reducing atmosphere protection, carrying out first dip plating on the round steel wire to sequentially wrap a zinc-ferrum alloy transition layer and a pure zinc coating outside the round steel wire, wherein the time of the first dip plating is 2.5-5 seconds, and then carrying out first cooling on the round steel wire subjected to dip plating by normal-temperature water;
and a second step of: drawing the cooled round steel wire by using a round cavity die to obtain a thin round steel wire with a required diameter, and continuously rolling the thin round steel wire to obtain a flat steel wire with a required size.
In the first step, the thickness of the zinc-iron alloy transition layer is less than 10um, and the thickness of the pure zinc plating layer is less than 20um.
In the first step, the preheating temperature is 450-460 ℃, and the temperature of the zinc liquid is 450-460 ℃.
In the first step, after the first cooling is finished, immersing the round steel wire with the zinc-iron alloy transition layer and the pure zinc coating into molten zinc-aluminum alloy liquid to carry out the second immersion plating, so as to sequentially wrap the zinc-iron alloy transition layer and the zinc-aluminum alloy coating outside the round steel wire, wherein the second immersion plating time is 2.5-5 seconds, and then carrying out the second cooling on the immersed round steel wire by normal-temperature water;
in the second step, the cooled round wire refers to a round wire after being cooled for the second time.
In the first step, the temperature of the zinc-aluminum alloy liquid is 450-460 ℃, the mass percentage concentration of aluminum in the zinc-aluminum alloy liquid is 5-10%, and the balance is zinc.
After the first dip plating and the second dip plating are finished, the surface of the round steel wire after the zinc liquid or the zinc-aluminum alloy liquid is wiped by using 99.99% high-purity nitrogen, and then the round steel wire is rapidly cooled by using warm water so as to cool the temperature of the round steel wire to 80-120 ℃.
In the first step, the thickness of the zinc-iron alloy transition layer is less than 10um, and the thickness of the zinc-aluminum alloy coating is less than 20um.
In the first step, the metallographic structure of the round steel wire with the corresponding diameter is a sorbite structure, the sorbite rate is more than 95%, and the tensile strength is 800-900 Mpa.
The flat steel wire is manufactured by adopting the manufacturing method, is of a layered structure and sequentially comprises a steel wire base layer, a zinc-iron alloy transition layer and a pure zinc plating layer from inside to outside.
The flat steel wire is manufactured by adopting the manufacturing method, is of a layered structure and sequentially comprises a steel wire base layer, a zinc-iron alloy transition layer and a zinc-aluminum alloy coating from inside to outside.
The supplementary technical characteristics of the invention are as follows:
the term "corresponding diameter" in the round wire of corresponding diameter in the present invention means: 7.0 mm-9.0 mm.
The reason for limiting the immersion plating time to 2.5-5 seconds in the invention is that: if the dip plating time is less than 2.5 seconds, the zinc-iron alloy transition layer on the surface of the round steel wire is formed to be not compact, so that the dip plating can be omitted; if the dip plating time exceeds 5 seconds, the zinc-iron alloy transition layer is too thick, and the processing performance of the subsequent process is affected.
After preheating is finished (for example, a tubular high-frequency induction heater is adopted for preheating), a pipeline is arranged to be communicated with a preheating device and a zinc pot inlet, and reducing gas is filled into the pipeline to ensure that the preheated round steel wire is always under the protection of the reducing gas before entering zinc liquid.
The zinc-iron alloy transition layer in the invention is a complex metal compound which is generated rapidly under the high temperature condition (in the zinc liquid at 450-460 ℃), so that the zinc-iron alloy transition layer cannot be melted and decomposed during the secondary hot dip for 2.5-5 seconds (in the alloy liquid at 450-460 ℃).
The round wire in the invention is preferably carbon steel, the diameter range is preferably 7.0 mm-9.0 mm, and the typical size of the final flat wire is preferably 8-12 mm in width and 3-5 mm in thickness.
In the first step of the invention, the surface treatment is carried out sequentially: immersing in a hydrochloric acid bath to wash off surface oxide skin of the round steel wire, cleaning the surface of the round steel wire by multistage serial water, immersing the round steel wire in a hot water bath for further cleaning; the concentration of the hydrochloric acid solution in the hydrochloric acid bath is 120-160 g/L, and the temperature is 50-60 ℃. In addition, the combination of electrolytic alkaline washing and electrolytic sulfuric acid washing can be used for surface treatment to replace hydrochloric acid washing.
Example 1:
The first step:
1.1, firstly selecting round steel wires with the steel grade of 45#, the diameter of 7.50mm, the metallographic structure of sorbite structure, the sorbite rate of 95 percent and the tensile strength of 800-900 Mpa, paying off the round steel wires in a continuous and damped mode to ensure the stability during operation, wherein the operation speed of the round steel wires is 25 meters/min, carrying out surface treatment after paying off the round steel wires, namely continuously immersing the round steel wires in a hydrochloric acid bath to wash off surface oxide skin (the concentration of hydrochloric acid solution is 120-160 g/L, and the temperature is 50-60 ℃), and further cleaning the surfaces of the steel wires by multistage serial water cleaning and immersing the round steel wires in a hot water bath;
1.2, preheating the round steel wire to 450-460 ℃ by adopting a tubular high-frequency induction heater, wherein the preheating time is 3 seconds, and simultaneously, introducing reducing gas hydrogen into the heating pipe so as to ensure that the round steel wire is always in a reducing atmosphere when being heated;
1.3, immersing the round steel wire preheated to 450-460 ℃ into molten zinc liquid, wherein the round steel wire is always in a reducing atmosphere in the whole process, the temperature of the zinc liquid in a zinc pot is set to 450-460 ℃, the purity of the zinc liquid is 99.995% or more, the dip plating time is 3 seconds, when the round steel wire is out of the zinc liquid, the surface of the steel wire is wiped with 99.99% high-purity nitrogen (favorable for improving the surface finish), then the round steel wire is rapidly cooled by normal-temperature water, at this time, in a coating structure wrapped on the round steel wire, the inner layer is a zinc-iron alloy transition layer, the outer layer is a pure zinc coating, the thickness ranges are respectively 6.7-9.0 um and 15.4-17.3 um, and in the specific reference to fig. 3, V1-V5 are zinc-iron alloy transition layer values, and V6-V10 are actually measured zinc coating values;
And a second step of:
2.1, drawing the round steel wire subjected to hot plating on a straight wire drawing machine by using a round hole cavity die to obtain a thin round steel wire with the diameter of 7.0 mm;
2.2, carrying out multi-pass continuous rolling processing on the thin round steel wire on a cold rolling unit to obtain a final flat steel wire, wherein the dimension is 3.98mm multiplied by 8.90mm, the dimensional tolerance range is thickness + -0.02 mm and width + -0.1 mm, at the moment, the whole coating (when the round steel wire is processed into the flat steel wire, the steel wire microstructure is elongated and flattened, the surface coating is synchronously elongated and flattened, the thickness of the zinc-iron alloy transition layer is thinner, the zinc-iron alloy transition layer and the pure zinc coating are difficult to distinguish under the microstructure, and the whole thickness of the coating can only be measured), and the thickness range of the whole coating is 8.485um, and particularly, referring to fig. 4, V1-V5 are actual measurement values of the whole coating.
Example 2:
The first step:
1.1, firstly selecting round steel wires with steel grade of C38D, diameter of 9.00mm, metallographic structure of sorbite structure, sorbite rate of more than 95 percent and tensile strength of 800-900 Mpa, paying off the round steel wires in a continuous and damped mode to ensure the stability during operation, wherein the operation speed of the round steel wires is 22 m/min, carrying out surface treatment after paying off the round steel wires, namely continuously immersing the round steel wires in a hydrochloric acid bath to wash off surface oxide skin (the concentration of hydrochloric acid solution is 120-160 g/L, and the temperature is 50-60 ℃), and further cleaning the surfaces of the multi-stage serial water cleaning steel wires and the round steel wires in a hot water bath;
1.2, preheating the round steel wire to 450-460 ℃ by adopting a tubular high-frequency induction heater, wherein the preheating time is 3.5 seconds, and simultaneously, introducing reducing gas hydrogen into the heating pipe so as to ensure that the round steel wire is always in a reducing atmosphere when being heated;
1.3, immersing the round steel wire preheated to 450-460 ℃ into molten zinc liquid, wherein the round steel wire is always in a reducing atmosphere in the whole process, the temperature of the zinc liquid in a zinc pot is set to 450-460 ℃, the purity of the zinc liquid is 99.995% or more, the immersion plating time is 3.5 seconds, then the round steel wire is wiped with 99.99% high-purity nitrogen when the round steel wire is out of the zinc liquid, then the round steel wire is rapidly cooled by normal-temperature water, then the round steel wire is immersed into molten zinc-aluminum alloy liquid (the aluminum content in the alloy liquid is 5-10% and the rest is zinc), the alloy liquid temperature is set to 450-460 ℃, the immersion plating time is 3.5 seconds, then the surface of the round steel wire is wiped with 99.99% high-purity nitrogen when the round steel wire is out of the alloy liquid, so as to ensure that the round steel wire is smooth and free of zinc seed zinc tumor, and then the round steel wire is rapidly cooled by normal-temperature water, at the moment, in a coating structure wrapped on the round steel wire, the inner layer is a zinc-iron alloy transition layer, the outer layer is a zinc-aluminum coating layer, the thickness range is respectively 2.9-4.1 um, 9.4-13 um, and a zinc alloy layer is a zinc alloy transition layer with a specific value of the zinc alloy transition layer in a measured value of a graph of the zinc alloy V5-6V 5-5V, and a measured value is shown in a graph with a measured value of a measured transition value;
And a second step of:
2.1, drawing the round steel wire subjected to hot plating on a straight wire drawing machine by using a round hole cavity die to obtain a thin round steel wire with the diameter of 8.5 mm;
2.2, carrying out multi-pass continuous rolling processing on the thin round steel wire on a cold rolling unit to obtain a final flat steel wire, wherein the dimension is 3.98mm multiplied by 11.90mm, the dimensional tolerance range is 0.02mm in thickness and 0.1mm in width, at the moment, the thickness range of the whole coating (at the moment, the thickness of the zinc-iron alloy transition layer is thinner, and the zinc-iron alloy transition layer and the zinc-aluminum alloy coating are difficult to distinguish under a microstructure) is 8.348um on average, and particularly referring to fig. 6, in the diagram, V1-V5 are actual measurement values of the whole coating.
Example 3:
the following table is a round steel wire with the diameter of 7.0mm, and the following table can be used for obtaining the following performance conditions in the subsequent processing under the conditions of zinc-iron alloy transition layers with different thicknesses and pure zinc plating layers:
only when the thickness of the zinc-iron alloy transition layer is less than 10um and the thickness of the pure zinc coating is less than 20um, the coating is not cracked in the subsequent processing.
The above description is merely of preferred embodiments of the present invention, and the scope of the present invention is not limited to the above embodiments, but all equivalent modifications or variations according to the present disclosure will be within the scope of the claims.
Claims (7)
1. A preparation method of a flat steel wire for a wiper arm framework structure is characterized by comprising the following steps: the preparation method comprises the following steps:
The first step: firstly selecting a round steel wire with a corresponding diameter, carrying out surface treatment on the round steel wire to obtain a bright round steel wire, preheating the bright round steel wire in a reducing atmosphere, immersing the preheated round steel wire in molten zinc liquid in the reducing atmosphere protection, carrying out first dip plating on the round steel wire to sequentially wrap a zinc-ferrum alloy transition layer and a pure zinc coating outside the round steel wire, wherein the time of the first dip plating is 2.5-5 seconds, and then carrying out first cooling on the round steel wire subjected to dip plating by normal-temperature water;
And a second step of: drawing the cooled round steel wire by using a round hole cavity die to obtain a thin round steel wire with a required diameter, and continuously rolling the thin round steel wire to obtain a flat steel wire with a required size;
In the first step, the thickness of the zinc-iron alloy transition layer is less than 10um, and the thickness of the pure zinc plating layer is less than 20um;
in the first step, the preheating temperature is 450-460 ℃, and the temperature of the zinc liquid is 450-460 ℃;
In the first step, the metallographic structure of the round steel wire with the corresponding diameter is a sorbite structure, the sorbite rate is more than 95%, and the tensile strength is 800-900 MPa;
The reducing atmosphere is hydrogen or carbon monoxide.
2. The method for manufacturing the flat steel wire for the wiper arm skeleton structure according to claim 1, wherein the method comprises the following steps:
in the first step, after the first cooling is finished, immersing the round steel wire with the zinc-iron alloy transition layer and the pure zinc coating into molten zinc-aluminum alloy liquid to carry out the second immersion plating, so as to sequentially wrap the zinc-iron alloy transition layer and the zinc-aluminum alloy coating outside the round steel wire, wherein the second immersion plating time is 2.5-5 seconds, and then carrying out the second cooling on the immersed round steel wire by normal-temperature water;
in the second step, the cooled round wire refers to a round wire after being cooled for the second time.
3. The method for manufacturing the flat steel wire for the wiper arm skeleton structure according to claim 2, wherein the method comprises the following steps: in the first step, the temperature of the zinc-aluminum alloy liquid is 450-460 ℃, the mass percentage concentration of aluminum in the zinc-aluminum alloy liquid is 5-10%, and the balance is zinc.
4. The method for manufacturing the flat steel wire for the wiper arm skeleton structure according to claim 2, wherein the method comprises the following steps: after the first dip plating and the second dip plating are finished, the surface of the round steel wire after the zinc liquid or the zinc-aluminum alloy liquid is wiped by using 99.99% high-purity nitrogen, and then the round steel wire is rapidly cooled by using warm water so as to cool the temperature of the round steel wire to 80-120 ℃.
5. The method for manufacturing the flat steel wire for the wiper arm skeleton structure according to claim 2, wherein the method comprises the following steps: in the first step, the thickness of the zinc-iron alloy transition layer is less than 10um, and the thickness of the zinc-aluminum alloy coating is less than 20um.
6. A flat wire, characterized in that: the flat steel wire is manufactured by adopting the manufacturing method of claim 1, is of a layered structure and sequentially comprises a steel wire base layer, a zinc-iron alloy transition layer and a pure zinc plating layer from inside to outside.
7. A flat wire, characterized in that: the flat steel wire is manufactured by adopting the manufacturing method of claim 2, is of a layered structure and sequentially comprises a steel wire base layer, a zinc-iron alloy transition layer and a zinc-aluminum alloy coating from inside to outside.
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Patent Citations (3)
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| CN108239735A (en) * | 2018-01-16 | 2018-07-03 | 江苏法尔胜缆索有限公司 | High tough, permanent seal cooling bridge cable 1960MPa grades of Zn-Al Alloy Coated Steel Wires of major diameter |
| CN109852898A (en) * | 2019-02-14 | 2019-06-07 | 法尔胜泓昇集团有限公司 | The manufacturing method of middle high aluminium content zinc aluminum alloy coating steel strand wires |
| CN112921261A (en) * | 2021-01-22 | 2021-06-08 | 天津市工大镀锌设备有限公司 | Process method for hot galvanizing of steel wire and obtaining thick alloy coating |
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