Galvanizing liquid, galvanized steel, preparation method of galvanized steel and automobile part
By adding additives such as polyethylene glycol and sodium dodecyl sulfate to the galvanized solution, zinc ions are evenly distributed, the grains of the plating are refined, and the internal stress of the plating layer is reduced, which solves the problem of grafting galvanized steel during stamping, and improves product quality and production efficiency.
Patent Information
- Application Number
- CN202510371246.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2025-05-13
AI Technical Summary
During the stamping process of automobile plates, galvanized steel is prone to hair pulling, which affects the product's corrosion resistance, appearance quality, strength and production cost.
A galvanizing solution is used, and its chemical compositions include acid zinc salts, a first additive (such as polyethylene glycol) and a second additive (such as sodium dodecyl sulfate). Through these additives, zinc ions are uniformly distributed, the plating grains are refined, and the internal stress of the plating layer is reduced, thereby improving the binding force between the plating layer and the substrate and the lubricity of the plating surface.
It effectively reduces the woven-pulling problem of galvanized steel during stamping, improves product quality and production efficiency, and reduces production costs.
Smart Images
Figure CN119980371A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of automobile plate preparation, and in particular to a galvanizing solution, galvanized steel, a preparation method thereof, and automobile parts. Background Art
[0002] As the environmentally friendly electrogalvanizing of automobile factories as automobile outer covering parts adopts no post-treatment, the pre-phosphating layer can increase the stamping lubricity compared with the pre-phosphating post-treatment products. However, due to the environmental protection requirements of automobile factories, more and more automobile factories adopt the non-phosphating coating process, so the steel plate surface adopts no post-treatment. The untreated automobile plate will appear burrs during stamping. The stamping marks of the plating layer not only affect the corrosion resistance of the subsequent products, which not only reduces the appearance quality of the product, but also may affect the strength and corrosion resistance of the product, increasing the scrap rate and production cost. At the same time, the tiny fine chips produced by the burrs accumulate in the stamping die, which easily causes stamping bulges and increases the number of die wipes. Summary of the invention
[0003] The present application provides a galvanizing solution, galvanized steel and a preparation method thereof and an automobile part to solve the following technical problem: how to reduce the problem of burring of galvanized steel during the stamping process.
[0004] In a first aspect, an embodiment of the present application provides a zinc plating solution, wherein the chemical composition of the zinc plating solution includes: an acidic zinc salt, a first additive, and a second additive, wherein the first additive can even out the crystal particle size distribution and zinc ion dispersion of the acidic zinc salt, and the second additive can improve and refine the grains of the coating formed by the zinc plating solution; wherein,
[0005] The concentration of the first additive is 0.3 g / L to 0.5 g / L, and the concentration of the second additive is 0.5 g / L to 1 g / L.
[0006] Optionally, the concentration of the first additive is 0.3 g / L, and the concentration of the second additive is 0.5 g / L.
[0007] Optionally, the first additive includes at least one of the following: polyethylene glycol, polyvinyl alcohol, and polypropylene glycol.
[0008] Optionally, the second additive includes at least one of the following: sodium lauryl sulfate, coconut oil fatty alcohol polyether, and sodium dodecylbenzene sulfonate.
[0009] Optionally, the zinc ion concentration of the zinc plating solution is 100 g / L to 140 g / L, and the free acid concentration in the zinc plating solution is 5 g / l to 7 g / l.
[0010] In a second aspect, an embodiment of the present application provides a method for preparing galvanized steel, the method comprising:
[0011] The steel substrate is electroplated using the galvanizing solution described in any one of the first aspects to obtain galvanized steel.
[0012] Optionally, the electroplating speed is 60m / min to 100m / min.
[0013] Optionally, the temperature of the zinc plating solution is 52°C to 55°C.
[0014] In a third aspect, an embodiment of the present application provides a galvanized steel, and the galvanized steel is prepared by any method described in the second aspect.
[0015] In a fourth aspect, an embodiment of the present application provides an automobile part, wherein the raw material of the automobile part includes the galvanized steel described in any one of the third aspects.
[0016] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:
[0017] The zinc plating solution provided in the embodiment of the present application has chemical components including: an acidic zinc salt, a first additive and a second additive, wherein the acidic zinc salt provides zinc ions; the first additive can be adsorbed on the surface of the crystals of the acidic zinc salt to hinder the further deposition of the anions and cations of the acidic zinc salt on these crystal faces, thereby inhibiting the growth of the crystals along a specific direction, making the shape of the crystals more regular and the particle size distribution more uniform, and can reduce the surface tension of the solution of the acidic zinc salt, so that the plating solution has better wettability and improves the uniformity of the dispersion of zinc ions; the second additive can refine the grains of the coating formed by the zinc plating solution, prevent the aggregation and growth of crystal nuclei, enable the crystals to grow uniformly and finely, reduce lattice defects, and thus reduce the internal stress of the coating; and the concentration of the first additive is 0.3g / L to 0.5g / L, and the concentration of the second additive is 0.5g / L to 1g / L, which can fully improve the dispersion ability of the zinc plating solution, refine the grains of the coating, and reduce the internal stress of the coating. The galvanizing liquid is used on the surface of a steel substrate to form a coating to obtain galvanized steel. The galvanized steel has good bonding strength between the coating and the substrate, lubricity of the coating surface, and low internal stress of the coating, thereby effectively reducing the occurrence of the problem of burring of the galvanized steel during the stamping process. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0020] Figure 1 A schematic flow chart of a method for preparing galvanized steel provided in an embodiment of the present application. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0022] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.
[0023] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple. "Parts" such as parts by weight and parts by mass indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, the mass ratio of substance A, substance B, and substance C is 1:2:3, then substance A, substance B, and substance C should correspond one-to-one with the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.
[0024] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.
[0025] In a first aspect, an embodiment of the present application provides a zinc plating solution, wherein the chemical composition of the zinc plating solution includes: an acidic zinc salt, a first additive, and a second additive, wherein the first additive can even out the crystal particle size distribution and zinc ion dispersion of the acidic zinc salt, and the second additive can improve and refine the grains of the coating formed by the zinc plating solution; wherein,
[0026] The concentration of the first additive is 0.3 g / L to 0.5 g / L, and the concentration of the second additive is 0.5 g / L to 1 g / L.
[0027] The chemical composition of the zinc plating solution includes: acidic zinc salt, a first additive and a second additive. As a key component of the zinc plating solution, the acidic zinc salt ionizes zinc ions in the solution, providing the necessary metal ion source for the zinc plating process, which serves as the basis of zinc plating. The acidic zinc salt can generally be zinc sulfate.
[0028] Crystal growth control: The first additive can be adsorbed on the surface of the acidic zinc salt crystals, and inhibit the growth of the crystals in a specific direction by hindering the further deposition of the anions and cations of the acidic zinc salt on these crystal faces. This effect is similar to setting up obstacles in the crystal growth process, so that the crystals cannot grow excessively in certain directions, thereby promoting a more regular shape of the crystals. For example, crystals that may have grown irregularly originally tend to balance their growth rates in all directions under the action of the additive, and eventually form crystals with more regular shapes. Particle size distribution optimization: Inhibiting growth in a specific direction makes the particle size distribution of the crystals more uniform. Because the crystals will not grow abnormally in individual directions, the overall crystal size is more consistent, avoiding excessive differences between large and small particles. Surface tension reduction and wettability improvement: The first additive can also reduce the surface tension of the acidic zinc salt solution, which makes the plating solution have better wettability. After the surface tension is reduced, the plating solution can better spread on the surface of the steel substrate, fully covering all parts of the substrate surface, ensuring that the zinc ions can be evenly dispersed on the substrate surface, creating favorable conditions for the subsequent deposition process. Good wettability helps to improve the uniformity of zinc ion dispersion, making the coating more uniform.
[0029] Grain refinement: The main function of the second additive is to refine the grains of the coating formed by the zinc plating solution. It prevents the aggregation and growth of crystal nuclei, allowing the crystal nuclei to grow independently after formation, avoiding the situation where multiple crystal nuclei gather together to form large grains. In this way, during the coating formation process, more crystal nuclei will grow at the same time, and eventually form uniform and fine crystals. Reduce lattice defects and reduce internal stress: Uniform and fine crystal structure can reduce the generation of lattice defects. The reduction of lattice defects makes the atomic arrangement inside the coating more orderly, thereby reducing the internal stress of the coating.
[0030] The concentration of the first additive can be 0.3g / L to 0.5g / L, and the concentration of the second additive can be 0.5g / L to 1g / L. The two additives can give full play to their respective roles and work together to improve the dispersion ability of the zinc plating solution, increase the crystal nucleus, refine the grains of the coating, and reduce the internal stress of the coating. If the concentration of the first additive is higher than 0.5g / L, the internal stress of the coating will increase, resulting in increased brittleness of the coating and easy cracking of the coating during stamping; if the concentration of the first additive is lower than 0.3g / L, it will affect the uniformity of the coating thickness of the plating solution, the coating on the edge or protruding part will be too thick, and the coating on the concave part will be too thin. If the concentration of the second additive is higher than 1g / L, it is easy to generate foam and cause defects such as coating floweriness; if the concentration of the second additive is lower than 0.5g / L, the uniformity of the coating of the plating solution will be reduced. Exemplarily, the concentration of the first additive can be 0.3 g / L, 0.35 g / L, 0.4 g / L, 0.45 g / L, 0.5 g / L, etc.; the concentration of the second additive can be 0.5 g / L, 0.6 g / L, 0.7 g / L, 0.8 g / L, 0.9 g / L, 1 g / L, etc.
[0031] Untreated automobile plates will have a burr phenomenon during stamping (referring to the appearance of small protrusions, burrs or scratches on the surface of automobile plates during the stamping process, similar to hair-like defects). The stamping marks of the coating not only affect the corrosion resistance of subsequent products, but the applicant has found that the burr problem is mainly caused by factors such as the high friction coefficient between the stamping die and the surface of the electro-galvanized automobile plate, the excessive internal stress of the coating, and the poor lubricity of the coating surface, which leads to the burr phenomenon on the surface. This not only reduces the appearance quality of the product, but also may affect the strength and corrosion resistance of the product, increase the scrap rate and production cost. At the same time, the tiny fine chips generated by the burr accumulate in the stamping die, which easily causes the stamping bulge and increases the number of die wiping times.
[0032] Therefore, the embodiment of the present application provides a galvanizing solution. After being treated with the galvanizing solution, the additive improves the performance of the plating solution, so that zinc ions can be evenly and firmly deposited on the surface of the steel substrate, and the coating formed on the surface of the steel substrate has good bonding between the coating and the substrate. At the same time, the improvement of the lubricity of the coating surface and the low internal stress of the coating improve the stamping performance of the product, reduce the friction of the galvanized steel during the stamping process, effectively reduce the occurrence of the problem of burring during the stamping process, and improve the quality and production efficiency of the product.
[0033] In some embodiments, the concentration of the first additive is 0.3 g / L, and the concentration of the second additive is 0.5 g / L.
[0034] For example, the concentration of the first additive may be 0.3 g / L, and the concentration of the second additive may be 0.5 g / L. For every 1,000 galvanized steel parts punched, the punching roughness phenomenon is significantly reduced, and the number of mold wipes is only 2.
[0035] In some embodiments, the first additive includes at least one of the following: polyethylene glycol, polyvinyl alcohol, polypropylene glycol.
[0036] In some embodiments, the second additive includes at least one of the following: sodium lauryl sulfate, coconut oil fatty alcohol polyether, sodium dodecylbenzene sulfonate.
[0037] The first additive may be a combination of one or more of polyethylene glycol, polyvinyl alcohol, and polypropylene glycol, all of which can even out the crystal particle size distribution of the acidic zinc salt and the dispersion of zinc ions. The second additive may be a combination of one or more of sodium dodecyl sulfate, coconut oil fatty alcohol polyether, and sodium dodecylbenzene sulfonate, all of which can improve and refine the grains of the coating formed by the zinc plating solution.
[0038] In some embodiments, the zinc ion concentration of the zinc plating solution is 100 g / L to 140 g / L, and the free acid concentration in the zinc plating solution is 5 g / l to 7 g / l.
[0039] The concentration of zinc ions in the zinc plating solution can be 100 g / L to 140 g / L, so that the grains of the coating are refined, the electrodeposition rate is ensured, and the bonding force between the coating and the substrate is improved. For example, the concentration of zinc ions in the zinc plating solution can be 100 g / L, 110 g / L, 120 g / L, 130 g / L, 140 g / L, etc.
[0040] In a second aspect, the present application provides a method for preparing galvanized steel. Figure 1 A schematic diagram of a process for preparing galvanized steel provided in an embodiment of the present application; see Figure 1 , the method comprising:
[0041] S1. Use the galvanizing solution described in any one of the first aspects to electroplate a steel substrate to obtain galvanized steel.
[0042] The galvanizing solution described in the first aspect is used for electroplating, wherein the acidic zinc salt provides zinc ions, and the first additive and the second additive play a role in inhibiting crystal growth, refining grains, reducing internal stress, etc., respectively. Combined with the optimized electroplating process conditions, the prepared galvanized steel can have good bonding strength between the coating and the substrate, lubricity of the coating surface and low internal stress of the coating, which effectively reduces the problem of burring in the subsequent stamping process.
[0043] In addition, after smelting and casting into slabs, hot rolling, cold rolling, continuous annealing and skin-passing are carried out; the skin-passed strip steel is cleaned by alkali washing, brushing, electrolytic degreasing, rinsing and other processes to obtain a steel matrix, which then enters the electrogalvanizing tank and adopts a gravity electroplating process. After the electroplating is completed, the surface of the plated part is cleaned with deionized water to remove the residual electroplating solution.
[0044] In some embodiments, the electroplating speed is 60 m / min to 100 m / min.
[0045] The electroplating speed can be 60m / min to 100m / min to ensure that the grain size of the coating is moderate and the bonding strength between the coating and the substrate is good. For example, the electroplating speed can be 60m / min, 65m / min, 70m / min, 75m / min, 80m / min, 85m / min, 90m / min, 95m / min, 100m / min, etc.
[0046] In some embodiments, the temperature of the zinc plating solution is 52°C to 55°C.
[0047] The temperature of the galvanizing solution can be 52°C to 55°C. When the temperature of the galvanizing solution is appropriately increased, the migration and diffusion of ions are easier, and metal atoms have more opportunities to arrange in an orderly manner, thereby forming a more regular crystal structure, making the crystallization of the coating more delicate and compact. However, if the temperature of the galvanizing solution is higher than 55°C, the grain growth rate is too fast, which may cause coarse grains in the coating. For example, the temperature of the galvanizing solution can be 52°C, 53°C, 54°C, 55°C, etc.
[0048] The preparation method of galvanized steel is based on the above-mentioned galvanizing liquid. The specific chemical composition of the galvanizing liquid can refer to the above-mentioned embodiment. Since the preparation method of galvanized steel adopts part or all of the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.
[0049] In a third aspect, an embodiment of the present application provides a galvanized steel, and the galvanized steel is prepared by any method described in the second aspect.
[0050] Since the preparation method includes the optimization of the zinc plating solution components (such as acidic zinc salt, the first additive, and the second additive) and the control of the electroplating process conditions, the prepared galvanized steel can have some excellent properties, such as good adhesion between the coating and the substrate, lubricity of the coating surface, and low internal stress of the coating, thereby reducing the problem of burrs in the stamping process and improving product quality and production efficiency.
[0051] The galvanized steel is realized based on the preparation method of the galvanized steel mentioned above. The specific steps of the preparation method of the galvanized steel can refer to the above embodiment. Since the galvanized steel adopts part or all of the technical solutions of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described one by one here.
[0052] In a fourth aspect, an embodiment of the present application provides an automobile part, wherein the raw material of the automobile part includes the galvanized steel described in any one of the third aspects.
[0053] Since the galvanized steel used has the characteristics of good bonding between the coating and the substrate, good lubricity of the coating surface and low internal stress of the coating, when it is used as the raw material of automotive parts, it can significantly improve the performance of automotive parts.
[0054] The automobile part is realized based on the above-mentioned galvanized steel. The specific preparation steps of the galvanized steel can refer to the above-mentioned embodiment. Since the automobile part adopts part or all of the technical solutions of the above-mentioned embodiment, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be described one by one here.
[0055] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for the unrecorded specific conditions in the following examples are usually measured according to national standards. If there is no corresponding national standard, then carry out according to general international standards, normal conditions or according to the conditions recommended by the manufacturer.
[0056] Example 1
[0057] A zinc plating solution, the chemical components of which include: zinc sulfate, polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS); the zinc ion concentration of the zinc plating solution is 120 g / L, the concentration of polyethylene glycol (PEG) is 0.3 g / L, the concentration of sodium dodecyl sulfate (SDS) is 0.5 g / L, and the free acid concentration of the zinc plating solution is 5 g / L.
[0058] A method for preparing galvanized steel comprises: using the galvanizing solution to gravity electroplate a steel substrate to obtain the galvanized steel; wherein the electroplating speed is 60 m / min and the temperature of the galvanizing solution is 52°C.
[0059] Example 2
[0060] A zinc plating solution, the chemical components of which include: zinc sulfate, polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS); the zinc ion concentration of the zinc plating solution is 125 g / L, the concentration of polyethylene glycol (PEG) is 0.4 g / L, the concentration of sodium dodecyl sulfate (SDS) is 0.75 g / L, and the free acid concentration of the zinc plating solution is 6 g / L.
[0061] A method for preparing galvanized steel comprises: using the galvanizing liquid to perform gravity electroplating on a steel substrate to obtain the galvanized steel; wherein the electroplating speed is 80 m / min and the temperature of the galvanizing liquid is 53°C.
[0062] Example 3
[0063] A zinc plating solution, the chemical components of which include: zinc sulfate, polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS); the zinc ion concentration of the zinc plating solution is 140 g / L, the concentration of polyethylene glycol (PEG) is 0.5 g / L, the concentration of sodium dodecyl sulfate (SDS) is 1 g / L, and the free acid concentration of the zinc plating solution is 7 g / L.
[0064] A method for preparing galvanized steel comprises: using the galvanizing solution to gravity electroplate a steel substrate to obtain the galvanized steel; wherein the electroplating speed is 80 m / min and the temperature of the galvanizing solution is 55°C.
[0065] Comparative Example 1
[0066] A zinc plating solution, the chemical composition of which includes zinc sulfate, and the free acid concentration of the zinc plating solution is 5.5 g / L.
[0067] A method for preparing galvanized steel comprises: using the galvanizing solution to gravity electroplate a steel substrate to obtain the galvanized steel; wherein the electroplating speed is 70 m / min and the temperature of the galvanizing solution is 58°C.
[0068] Comparative Example 2
[0069] A zinc plating solution, the chemical components of which include: zinc sulfate and sodium dodecyl sulfate (SDS); the zinc ion concentration of the zinc plating solution is 130 g / L, the concentration of sodium dodecyl sulfate (SDS) is 0.8 g / L, and the free acid concentration of the zinc plating solution is 6.5 g / L.
[0070] A method for preparing galvanized steel comprises: using the galvanizing solution to gravity electroplate a steel substrate to obtain the galvanized steel; wherein the electroplating speed is 90 m / min and the temperature of the galvanizing solution is 54°C.
[0071] The galvanized steel sheets of Examples 1 to 3 and Comparative Examples 1 to 2 were used for parts stamping in an automobile factory. The number of die wiping for 1000 parts stampings was tracked. The stamping results are shown in Table 1.
[0072] Table 1 Stamping results
[0073]
[0074] As shown in Table 1, by optimizing the electroplating process parameters and adding additives to the zinc plating solution, the occurrence of the punching burr problem can be effectively reduced. However, in Comparative Example 1, polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS) were not used, and in Comparative Example 2, polyethylene glycol (PEG) was not used, which, to a certain extent, led to obvious punching burrs in the punching process, a high number of die wiping times, and a large number of inferior parts with punching bulges that needed to be repaired.
[0075] One or more technical solutions in the embodiments of the present application also have at least the following technical effects or advantages:
[0076] (1) By optimizing the electroplating process parameters and adding additives to the zinc plating solution, the bonding strength between the coating and the substrate is effectively improved, the internal stress of the coating is reduced, and the lubricity of the coating surface is improved, thereby reducing the occurrence of punching burrs. Reducing punching burrs can not only improve product quality, but also reduce the number of die wipes and punching bulges caused by fine cutting of the falling zinc powder.
[0077] (2) The amount of additives used in the electroplating solution is small, which can improve the stamping performance of the product and reduce the phenomenon of stamping roughness. It has low cost and strong practicality.
[0078] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.
Claims
1. A zinc plating solution, the chemical composition of which comprises: Acidic zinc salt, a first additive and a second additive, wherein the first additive can make the crystal size distribution and zinc ion dispersion of the acidic zinc salt uniform, and the second additive can improve and refine the grains of the coating formed by the zinc plating solution; wherein, The concentration of the first additive is 0.3 g / L to 0.5 g / L, and the concentration of the second additive is 0.5 g / L to 1 g / L.
2. The zinc plating solution according to claim 1, characterized in that The concentration of the first additive is 0.3 g / L, and the concentration of the second additive is 0.5 g / L.
3. The zinc plating solution according to claim 1, characterized in that The first additive includes at least one of the following: polyethylene glycol, polyvinyl alcohol, and polypropylene glycol.
4. The zinc plating solution according to claim 1, characterized in that The second additive includes at least one of the following: sodium lauryl sulfate, coconut oil fatty alcohol polyether, and sodium dodecylbenzene sulfonate.
5. The zinc plating solution according to claim 1, characterized in that The zinc ion concentration of the zinc plating solution is 100 g / L to 140 g / L, and the free acid concentration in the zinc plating solution is 5 g / L to 7 g / L.
6. A method for preparing galvanized steel, the method comprising: The steel substrate is electroplated using the galvanizing solution described in any one of claims 1 to 5 to obtain galvanized steel.
7. The method according to claim 6, characterized in that The electroplating speed is 60m / min to 100m / min.
8. The method according to claim 6, characterized in that The temperature of the zinc plating solution is 52°C to 55°C.
9. A galvanized steel, wherein the galvanized steel is prepared by the method according to any one of claims 6 to 8.
10. An automobile part, wherein the raw material of the automobile part comprises the galvanized steel according to claim 9.