CN113073282B - Low-nickel-content high-corrosion-resistance plated steel wire and processing method thereof - Google Patents
Low-nickel-content high-corrosion-resistance plated steel wire and processing method thereof Download PDFInfo
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- C23C—COATING 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
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- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
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Abstract
The invention discloses a steel wire with a low nickel content and a high corrosion resistance coating and a processing method thereof, wherein the surface layer of the steel wire is a Fe-Ni-Zn alloy coating, the iron content is 5-20%, the nickel content is 0.1-10%, and the balance is zinc and impurities. The processing method of the coated steel wire comprises the following steps: step one, pre-plating a nickel layer on the surface of a steel wire; step two, hot galvanizing, namely hot galvanizing the nickel pre-plated steel wire obtained in the step one; step three, hot surface drawing, namely hot surface drawing of the nickel-plated and hot-galvanized steel wire in the step two to form a Fe-Ni-Zn alloy coating; and step four, drawing the steel wire formed in the step three to the required specification diameter. The plated steel wire has low nickel content and high corrosion resistance, and is easy to realize industrial production.
Description
Technical Field
The invention relates to a plated steel wire and a processing method thereof, in particular to a plated steel wire with low nickel content and high corrosion resistance and a processing method thereof, wherein the plated steel wire can reduce the nickel consumption and improve the corrosion resistance of a steel surface plating layer.
Background
Nickel is often alloyed with other metals as an important metal element to improve corrosion resistance, such as nickel-zinc alloy coatings. However, nickel is expensive and its improvement in corrosion resistance is limited as the content of nickel in the alloy increases. Therefore, the development of a plating layer or alloy with low nickel content and high corrosion resistance has important engineering value and significance.
The patent application with the publication number of CN101225518A and the patent name of 'a method for hot galvanizing after pre-chemical nickel plating for controlling the thickness of a silicon-containing active steel plating layer' discloses a method for hot galvanizing after pre-chemical nickel plating for controlling the thickness of the silicon-containing active steel plating layer, which comprises the following processes: (1) the method comprises the following steps of (1) carrying out pretreatment of chemical nickel plating on the surface of a silicon-containing steel part, (2) carrying out chemical nickel plating on the surface of the silicon-containing steel part, and (3) carrying out hot galvanizing on the silicon-containing active steel part after the chemical nickel plating is dried.
The patent application with the publication number of CN101082132A and the patent name of 'method for hot galvanizing after pre-chemical nickel plating for controlling the thickness of silicon-containing active steel coating' discloses a production process for strip steel continuous hot galvanizing aluminum zinc, which comprises the steps of annealing treatment before continuous hot galvanizing/aluminum zinc production, electroplating a layer of extremely thin nickel (10-50 nanometers) on a base, and then hot galvanizing/aluminum zinc to improve the adhesive force between the coating and the steel.
Both of the above patent documents are methods of pre-plating nickel on the surface of steel and then plating zinc on the surface of steel, and the surface elements of the plating layer are also zinc-nickel or zinc-aluminum-nickel, etc., however, the corrosion resistance of the plating layer is slightly improved after the weight percentage of nickel in the zinc-nickel alloy is increased to 10%. How to reduce the amount of nickel and improve the corrosion resistance of a steel surface coating is an important direction of industry development.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-nickel-content high-corrosion-resistance plated steel wire capable of improving the corrosion resistance of a steel surface plating layer while reducing the nickel consumption and a processing method thereof.
The invention adopts the following technical scheme:
a steel wire with a low nickel content and a high corrosion resistance coating layer is characterized in that the surface layer of the steel wire is a Fe-Ni-Zn alloy coating layer, the iron content is 5% -20%, the nickel content is 0.1% -10%, and the balance is zinc and impurities.
Furthermore, the iron content in the coating is 8-15%, the nickel content is 1-5%, and the balance is zinc and impurities.
The processing method of the plated steel wire comprises the following steps:
firstly, pre-plating a nickel layer on the surface of the steel wire, wherein the thickness of the nickel layer is 0.01-1 mu m. The thickness of the nickel preplating layer on the surface of the steel wire is very thin, so that the nickel consumption on the surface layer of the steel wire is controlled;
step two, hot galvanizing the nickel preplated steel wire obtained in the step one, wherein the hot galvanizing time is 1-6 seconds, and the temperature of a zinc solution is 440-460 ℃;
step three, performing hot surface drawing on the nickel-plated hot-dip galvanized steel wire in the step two, wherein the hot surface drawing temperature is 200-550 ℃, and the surface reduction rate is 0.01-5%, so that a Fe-Ni-Zn alloy coating is formed on the surface of the steel wire;
and step four, drawing the steel wire with the Fe-Ni-Zn alloy coating formed in the step three to the required specification diameter.
Further, in the first step, the thickness of the nickel plating layer is 0.01-0.8 μm.
Further, in the second step, the hot galvanizing time of the steel wire is 2-4 seconds, and the temperature of the zinc liquid is 445-.
Further, in the third step, the hot surface drawing temperature of the steel wire is 300-450 ℃.
Furthermore, in the third step, the hot surface tension area reduction rate of the steel wire is 0.1-3%.
Compared with the prior art, the invention has the beneficial effects that:
in the prior art, in order to improve the corrosion resistance, the nickel content in the surface coating of the steel wire is generally increased, but the thickness of the pre-plated nickel layer is not more than 1 mu m, the nickel content in the finally formed Fe-Ni-Zn alloy coating is very low, and the steel wire with the Fe-Ni-Zn alloy coating can be obtained by combining hot galvanizing and hot surface drawing processes, and has the advantages of low nickel content and high corrosion resistance.
Drawings
FIG. 1 is a graph comparing polarization curves of a steel wire having a Fe-Ni-Zn alloy coating layer manufactured by the method of the present invention with those of a steel wire manufactured by a conventional hot dip galvanizing method and a steel wire having a 10% Ni-Zn alloy coating layer manufactured by a conventional method;
FIG. 2 is a distribution diagram of Fe-Ni-Zn element on the surface of the steel wire in the third step of example one (thickness of the nickel preplating layer is 0.5 μm);
FIG. 3 is an SEM image of the cross section of the plated layer in the second embodiment;
FIG. 4 is a line scan diagram of the steel wire from the base to the coating layer in the second example;
FIG. 5 is a graph of the results of the salt spray test; wherein: (a) is a salt spray test result chart of the steel wire manufactured by the prior hot galvanizing method; (b) is a salt spray test result chart of the steel wire with the Fe-Ni-Zn alloy coating formed by the method (the thickness of the pre-plating nickel layer is 0.5 micron); (c) is a salt spray test result chart of the steel wire with the Fe-Ni-Zn alloy coating formed by the method (the thickness of the pre-plating nickel layer is 0.8 micron); (d) is a salt spray test result chart of the steel wire with 10 percent of nickel-zinc alloy coating manufactured by the prior method.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in implementation will be clearly and completely described below.
The invention relates to a low-nickel-content high-corrosion-resistance plated steel wire and a processing method thereof, which comprises the following steps:
step one, selecting a steel wire with a certain specification to pre-plate a nickel layer. Pre-electroplating a nickel layer, and controlling the use amount of nickel on the surface layer of the steel wire. The thickness of the nickel plating is controlled to be 0.01 to 1 μm, preferably 0.01 to 0.8 μm.
Step two, hot galvanizing. Hot galvanizing, wherein the hot galvanizing speed and the galvanizing temperature are controlled, and the hot galvanizing time is 1-6 seconds, preferably 2-4 seconds; the temperature of the zinc liquid is 440-460 ℃, preferably 450 ℃.
Step three, hot surface drawing. Hot surface drawing, controlling the temperature and the surface reduction rate of the surface drawing, and promoting the zinc and the nickel alloy to diffuse to the steel wire base material by the surface drawing with the temperature and the small surface reduction rate to form an Fe-Ni-Zn alloy coating, wherein the iron content is 5-20 percent, and is preferably 8-15 percent; the nickel content is 0.1-10%, preferably 1-5%; the balance of zinc and impurities. The hot surface drawing temperature of the steel wire is 200-550 ℃, preferably 300-450 ℃; the surface reduction rate is 0.01 to 5 percent, preferably 0.1 to 3 percent.
And step four, drawing to the required specification diameter. And drawing the pre-plated nickel and electrogalvanized steel wire to the required specification.
Example one
Step one, selecting a 72A steel wire with the diameter of 1.0mm to pre-electroplate nickel, wherein the thickness of a nickel plating layer is 0.5 mu m;
step two, the hot galvanizing time of the steel wire is 2 seconds, and the temperature of zinc liquid is 450 ℃;
and step three, the hot surface drawing temperature is 420 ℃, and the surface reduction rate is 1%. The distribution of Fe-Ni-Zn elements in the Fe-Ni-Zn alloy coating on the surface of the steel wire with the pre-plated nickel layer thickness of 0.5 mu m is shown in figure 2, wherein the contents of the three elements are that the iron content is 12 percent, the nickel content is 1.5 percent, and the zinc and impurity content is 86.5 percent;
and step four, drawing the steel wire to 0.21 mm.
The steel wire with the Fe-Ni-Zn alloy coating can be obtained by the method of the embodiment, and the steel wire has the advantages of 1.5 percent of nickel content and high corrosion resistance.
Example two
Step one, selecting a 72A steel wire with the diameter of 1.0mm to pre-electroplate nickel, wherein the thickness of a nickel plating layer is 0.6 mu m;
step two, the hot galvanizing time of the steel wire is 2 seconds, and the temperature of zinc liquid is 450 ℃;
step three, the hot surface drawing temperature is 400 ℃, and the surface reduction rate is 0.5%. Finally forming a steel wire ternary alloy coating, wherein a cross section SEM appearance of the coating is shown in figure 3, a line scan from a steel wire substrate to the coating is shown in figure 4, the contents of three elements are that the iron content is 10%, the nickel content is 1.8%, and the zinc and impurity content is 88.2%;
and step four, drawing the steel wire to 0.21 mm.
The steel wire with the Fe-Ni-Zn alloy coating can be obtained by the method of the embodiment, and has the advantages of 1.8 percent of nickel content and high corrosion resistance.
EXAMPLE III
Step one, selecting a 72A steel wire with the diameter of 1.0mm to pre-electroplate nickel, wherein the thickness of a nickel plating layer is 0.8 mu m;
step two, the hot galvanizing time of the steel wire is 2 seconds, and the temperature of zinc liquid is 450 ℃;
and step three, the hot surface drawing temperature is 380 ℃, and the surface reduction rate is 2%. The contents of the three elements are that the iron content is 11 percent, the nickel content is 1.9 percent, and the zinc and impurity content is 87.1 percent;
and step four, drawing the steel wire to 0.21 mm.
The steel wire with the Fe-Ni-Zn alloy coating can be obtained by the method of the embodiment, and the steel wire has the advantages of low nickel content and high corrosion resistance.
Comparative examples
FIG. 1 is a graph showing a comparison of polarization curves of a steel wire having a Fe-Ni-Zn alloy coating layer manufactured by the method of the present invention, a steel wire manufactured by a conventional hot dip galvanizing method, and a steel wire having a nickel-zinc alloy coating layer with a high nickel content manufactured by a conventional method (specifically, a 10% nickel-zinc alloy in this example). Wherein: sample 1 is a hot-dip galvanized steel wire manufactured by the conventional hot-dip galvanizing method; sample 2 is a steel wire with a Fe-Ni-Zn alloy coating manufactured by the method of the invention, and the thickness of the nickel pre-plating layer in the first step is 0.5 μm; sample 3 is a steel wire with a Fe-Ni-Zn alloy coating manufactured by the method of the invention, and the thickness of the nickel pre-plating layer in the first step is 0.8 μm; sample 4 is a steel wire with a 10% nickel-zinc alloy coating made by the existing nickel pre-plating and hot galvanizing methods. All four samples were drawn from 1.0mm to 0.21 mm. It can be seen from the polarization curve that the corrosion resistance of the steel wire obtained by the method of the invention is superior to that of the galvanized steel wire or nickel-zinc alloy coated steel wire obtained by the prior art method.
As shown in fig. 5, four samples were used for the salt spray test in this example. Sample 1 is a hot-dip galvanized steel wire 1.0mm produced by the conventional hot-dip galvanizing method, and the weight of the zinc layer is 120- 2 The unilateral thickness is 16.6-18.1um, and the test result of the sample 1 after 96 hours of salt spray is shown in figure 5 (a); sample 2 is a steel wire (thickness of 0.5 micron) with Fe-Ni-Zn alloy coating formed by the method of the invention is 1.0mm, and the coating weight is 35-40g/m 2 The unilateral thickness is 4.8-5.5um, and the test result of the sample 2 after 96 hours of salt spray is shown in figure 5 (b); sample 3 is a steel wire (thickness of 0.8 micron) with Fe-Ni-Zn alloy coating formed by the method of the invention, the thickness of the nickel preplating layer is 1.0mm, and the weight of the zinc layer is 35-40g/m 2 The unilateral thickness is 4.8-5.5um, and the test result of the sample 3 after 96 hours of salt spray is shown in figure 5 (c); sample 4 is a 1.0mm steel wire containing 10% nickel plating and hot galvanizing formed by the prior method, and the weight of a zinc layer is 35-40g/m 2 Single side thickness of 4.8-5.5umThe results of the test of sample 4 after 96 hours of salt spray are shown in FIG. 5 (d).
The salt spray test data is as follows:
| sample number | Coating weight | Thickness of coating | Results of 96-hour |
| 1 | 120-130g/m 2 | 16.6-18.1um | 5% of red rust and 25% of |
| 2 | 35-40g/m 2 | 4.8-5.5um | Yellow spot 15 |
| 3 | 35-40g/m 2 | 4.8-5.5 | Yellow spot 20% |
| 4 | 35-40g/m 2 | 4.8-5.5 | 1% of red rust and 20% of yellow spot |
It can be seen from the figure that the corrosion resistance of the steel wires (sample 2 and sample 3) obtained by the method of the present invention is superior to that of the galvanized steel wire (sample 1) or the nickel-zinc alloy plated steel wire (sample 4) obtained by the prior art method, and the corrosion of the steel wire having a 10% nickel-zinc alloy plating (sample 4) is severe.
In conclusion, the steel wire with the coating, which is obtained by the method and has low nickel content and high corrosion resistance, has the iron, nickel and zinc alloy coating on the surface of the steel wire, so that the corrosion resistance of the existing zinc-nickel alloy coating steel wire can be effectively improved, and the production cost is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A processing method of a steel wire with a low nickel content and a high corrosion resistance coating is characterized by comprising the following steps:
firstly, pre-plating a nickel layer on the surface of a steel wire, wherein the thickness of the nickel layer is 0.01-1 mu m;
step two, hot galvanizing the nickel preplated steel wire obtained in the step one, wherein the hot galvanizing time is 1-6 seconds, and the temperature of a zinc solution is 440-460 ℃;
step three, performing hot surface drawing on the nickel-plated hot-dip galvanized steel wire obtained in the step two, wherein the hot surface drawing temperature is 200-550 ℃, and the surface reduction rate is 0.01-5%, so that a Fe-Ni-Zn alloy coating is formed on the surface of the steel wire;
step four, drawing the steel wire formed in the step three to the required specification diameter; the steel wire with the coating with low nickel content and high corrosion resistance is obtained, the surface layer of the steel wire is a Fe-Ni-Zn alloy coating, the iron content in the coating is 5-20%, the nickel content is 0.1-10%, and the balance is zinc and impurities.
2. The method for processing a low-nickel content high-corrosion-resistance coated steel wire as recited in claim 1, wherein in the first step, the thickness of said nickel layer is 0.01 μm to 0.8 μm.
3. The method for processing the steel wire with the low nickel content and the high corrosion resistance coating according to claim 1, wherein in the second step, the hot galvanizing time of the steel wire is 2-4 seconds, and the temperature of the zinc solution is 445-455 ℃.
4. A method for processing a coated steel wire with low Ni content and high corrosion resistance as claimed in claim 1, wherein in the third step, the hot strip temperature of the steel wire is 300-450 ℃.
5. The method for processing a plated steel wire with low nickel content and high corrosion resistance according to claim 1, wherein the hot surface area reduction ratio of the steel wire is 0.1-3% in the third step.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082132A (en) * | 2006-05-31 | 2007-12-05 | 福建方明钢铁有限公司 | Production technique for belt steel continuous zinc/aluminium/aluminium zinc coating |
| CN101225518A (en) * | 2007-12-14 | 2008-07-23 | 华南理工大学 | Hot-dip galvanizing with electroless ni pre-plating method for controlling thickness of silicon-containing active steel plating |
| CN108707852A (en) * | 2018-05-30 | 2018-10-26 | 江苏法尔胜缆索有限公司 | Bridge cable high intensity multiple zinc-base alloy coating wire and its hot plating technology |
| CN111570558A (en) * | 2020-05-28 | 2020-08-25 | 法尔胜泓昇集团有限公司 | Zinc-based multi-element alloy coated steel wire and manufacturing method thereof |
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- 2021-03-30 CN CN202110339280.9A patent/CN113073282B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082132A (en) * | 2006-05-31 | 2007-12-05 | 福建方明钢铁有限公司 | Production technique for belt steel continuous zinc/aluminium/aluminium zinc coating |
| CN101225518A (en) * | 2007-12-14 | 2008-07-23 | 华南理工大学 | Hot-dip galvanizing with electroless ni pre-plating method for controlling thickness of silicon-containing active steel plating |
| CN108707852A (en) * | 2018-05-30 | 2018-10-26 | 江苏法尔胜缆索有限公司 | Bridge cable high intensity multiple zinc-base alloy coating wire and its hot plating technology |
| CN111570558A (en) * | 2020-05-28 | 2020-08-25 | 法尔胜泓昇集团有限公司 | Zinc-based multi-element alloy coated steel wire and manufacturing method thereof |
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