Zinc bath alloy, preparation method, zinc plating method and metal plating piece

Abstract

The invention discloses a zinc bath alloy, a preparation method, a galvanizing method and a metal plated part, and relates to the technical field of hot dip galvanizing. The zinc bath alloy comprises the following components in percentage by weight: 0.005 wt% to 0.015 wt% of aluminum, 0.0006 wt% to 0.0018 wt% of silicon, 0.0002 wt% to 0.005 wt% of titanium and 0.95 wt% to 0.99 wt% of zinc. According to the zinc bath alloy, the types and contents of all the components in the zinc bath alloy are adjusted, specifically, a proper amount of Al, Si and Ti microelements are added into a zinc bath, hot dipping can be further conducted on various base materials through zinc plating operation, the corrosion resistance of a plating layer can be improved, the adhesive force of the plating layer is increased, and the service life of the plating layer is prolonged. The problem that the corrosion resistance of a metal plating piece is insufficient under high-temperature hot dipping is effectively solved, and the corrosion resistance of the plating layer is more than two times that of a pure zinc plating layer with the same thickness.

Description

Technical Field

[0001] The present application relates to the technical field of hot-dip galvanizing, and in particular to a zinc bath alloy, a preparation method, a galvanizing method and a metal plated part. Background Art

[0002] With the rapid development of industries such as communications and electricity, the demand for hot-dip galvanized products is increasing year by year, and the requirements for product quality are constantly improving; after assembly and application, fasteners are often corroded first, resulting in multiple replacements of fasteners during the service life of the product. In order to match the life of connectors and reduce the frequency of maintenance and replacement, fastener hot-dip companies are looking for zinc bath compositions and hot-dip methods that meet market demand.

[0003] At present, hot-dip fasteners mainly use pure zinc bath or zinc bath containing Al, Ni, RE less than 0.005wt% or electroplating. However, since the hot-dip fasteners belong to high-temperature galvanizing (galvanizing temperature exceeds 500℃), the Ni and RE are easily oxidized at high temperatures, and the quality of their coatings ultimately cannot meet the requirements of synchronous corrosion life of matching connectors. Summary of the invention

[0004] In view of this, the present application provides a zinc bath alloy, a preparation method, a galvanizing method and a metal plated part, which effectively solve the technical problem of insufficient corrosion life of metal plated parts.

[0005] According to one aspect of the present application, a zinc bath alloy is provided, the zinc bath alloy comprising:

[0006] Aluminum 0.005wt%-0.015wt%, silicon 0.0006wt%-0.0018wt%, titanium 0.0002wt%-0.005wt%, zinc 0.95wt%-0.99wt%.

[0007] Optionally, the zinc bath alloy comprises:

[0008] Aluminum 0.005wt%-0.015wt%, silicon 0.0006wt%-0.0018wt%, titanium 0.0002wt%-0.005wt%, magnesium 0.01wt%-0.05wt%, zinc 0.90wt%-0.98wt%.

[0009] Optionally, the zinc bath alloy comprises:

[0010] Aluminum 0.012wt%-0.015wt%, silicon 0.001wt%-0.0018wt%, titanium 0.0004wt%-0.004wt%, magnesium 0.03wt%-0.05wt%, zinc 0.92wt%-0.955wt%.

[0011] According to another aspect of the present application, a method for preparing a zinc bath alloy is provided, the method comprising:

[0012] Aluminum, silicon, titanium and zinc are added into a melting pot according to the proportion of the zinc bath alloy described in the above embodiment and heated to obtain an alloy melt, wherein the heating time is 3h-4h and the heating temperature is 600°C-700°C;

[0013] filtering impurities in the alloy melt;

[0014] The filtered alloy melt is poured into a casting mold and cooled at room temperature to form a block-shaped zinc bath alloy.

[0015] According to another aspect of the present application, a galvanizing method is provided, the method comprising:

[0016] Melting the zinc bath alloy described in the above embodiment into a zinc bath;

[0017] The substrate is immersed in the zinc bath for hot-dip galvanizing treatment to obtain a metal plated part with a hot-dip galvanized layer.

[0018] Optionally, the hot-dip galvanizing treatment has a treatment temperature of 480° C.-510° C., a galvanizing time of 1 min-2 min, and an air cooling time of 15 s-30 s.

[0019] Optionally, the hot-dip galvanized layer has a thickness of 5 μm-20 μm.

[0020] Optionally, the metal plated part is placed in a centrifuge for centrifugal treatment to remove excess zinc on the surface of the metal plated part.

[0021] Optionally, the substrate includes fasteners, cables, grids, plates, and pipes.

[0022] According to another aspect of the present application, a metal-plated part is provided, wherein the metal-plated part is manufactured by the galvanizing method described in the above embodiment.

[0023] By means of the above technical scheme, appropriate amounts of Al, Si, and Ti elements are added to the zinc bath alloy. Trace amounts of Si and Ti synergistically promote the orderly homogeneous crystallization and solidification of the coating to form fine equiaxed crystals, thereby achieving uniform corrosion of the coating during the corrosion process, eliminating the excessively fast local corrosion of the coating and extending the service life of the metal plated parts. Furthermore, trace amounts of Al and Si elements can form intermetallic compounds with free Fe in the zinc bath to effectively control and reduce the Fe content in the zinc bath, and effectively prevent Fe from reacting with Zn in the zinc bath to form iron-zinc intermetallic compounds (zinc slag), thereby ensuring the smoothness and flatness of the zinc coating, and further improving the corrosion resistance of the zinc coating. At the same time, trace amounts of Al, Si, and Ti elements can synergistically improve the fluidity of the zinc bath, reduce the thickness of the zinc coating while ensuring the uniformity of the zinc coating, and increase the adhesion of the coating, so that the surface of the zinc coating is bright and smooth. The corrosion resistance of the zinc coating formed by hot-dip galvanizing of the zinc bath alloy of this application is more than twice that of the pure zinc coating of the same thickness in the prior art.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 A comparison chart of the anti-corrosion performance provided by the examples of the present application is shown. DETAILED DESCRIPTION

[0027] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0029] Those skilled in the art will appreciate that, unless expressly stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, or there may be intermediate elements. In addition, the "connection" or "connection" used herein may include wireless connection or wireless fusion. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0030] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art.

[0031] In this embodiment, a zinc bath alloy is provided, the composition and weight percentage of the zinc bath alloy are: 0.005wt%-0.015wt% aluminum, 0.0006wt%-0.0018wt% silicon, 0.0002wt%-0.005wt% titanium, 0.95wt%-0.99wt% zinc, and the rest are unavoidable impurities.

[0032] In this embodiment, appropriate amounts of Al (aluminum), Si (silicon), and Ti (titanium) elements are added to the zinc bath alloy. Trace amounts of Si and Ti synergistically promote the orderly homogeneous crystallization and solidification of the coating to form fine equiaxed crystals, thereby achieving uniform corrosion of the coating during the corrosion process, eliminating the excessively fast local corrosion of the coating and extending the service life of the metal plated parts. Furthermore, trace amounts of Al and Si elements can form intermetallic compounds with free Fe in the zinc bath to effectively control and reduce the Fe content in the zinc bath, and effectively prevent Fe from reacting with Zn in the zinc bath to form iron-zinc intermetallic compounds (zinc slag), thereby ensuring the smoothness and flatness of the zinc coating, and further improving the corrosion resistance of the zinc coating. At the same time, trace amounts of Al, Si, and Ti elements can synergistically improve the fluidity of the zinc bath, reduce the thickness of the zinc coating while ensuring the uniformity of the zinc coating, and increase the adhesion of the coating, so that the surface of the zinc coating is bright and smooth. The corrosion resistance of the zinc coating formed by hot-dip galvanizing of the zinc bath alloy of this application is more than twice that of the pure zinc coating of the same thickness in the prior art.

[0033] It is worth mentioning that the present application controls the Al, Si, and Ti elements within a suitable range. If too much Al, Si, and Ti elements are added, brittle compounds may be formed at the interface between the galvanized layer and the substrate, weakening the bonding force between the coating and the substrate, and affecting the fluidity and wettability of the zinc liquid, thereby causing uneven thickness of the galvanized layer, which in turn reduces the corrosion resistance of the metal-plated parts.

[0034] In one embodiment, the composition and weight percentage of the zinc bath alloy are: aluminum 0.005wt%-0.015wt%, silicon 0.0006wt%-0.0018wt%, titanium 0.0002wt%-0.005wt%, magnesium 0.01wt%-0.05wt%, zinc 0.90wt%-0.98wt%, and the rest are unavoidable impurities.

[0035] In this embodiment, an appropriate amount of Mg (magnesium) element is added to the zinc bath alloy. The trace amount of Mg element further improves the compactness and adhesion of the corrosion products of the coating, further improves the corrosion resistance of the coating, and prolongs the service life of the metal plated parts.

[0036] In a preferred embodiment, the composition and weight percentage of the zinc bath alloy are: aluminum 0.012wt%-0.015wt%, silicon 0.001wt%-0.0018wt%, titanium 0.0004wt%-0.004wt%, magnesium 0.03wt%-0.05wt%, zinc 0.92wt%-0.955wt%, and the rest are unavoidable impurities.

[0037] In this embodiment, a method for preparing a zinc bath alloy is provided, comprising: adding aluminum, silicon, titanium and zinc according to the proportion of the zinc bath alloy into a melting pot and heating the mixture to obtain a molten alloy; filtering impurities in the molten alloy; pouring the filtered molten alloy into a casting mold, and cooling the molten alloy at room temperature to form a block of zinc bath alloy.

[0038] Among them, the heating time is 3h-4h, and the heating temperature is 600℃-700℃.

[0039] The ratio of the zinc bath alloy 1: aluminum 0.005wt%-0.015wt%, silicon 0.0006wt%-0.0018wt%, titanium 0.0002wt%-0.005wt%, magnesium 0.01wt%-0.05wt%, zinc 0.90wt%-0.98wt%.

[0040] Proportion 2 of the zinc bath alloy: 0.005wt%-0.015wt% of aluminum, 0.0006wt%-0.0018wt% of silicon, 0.0002wt%-0.005wt% of titanium, and 0.95wt%-0.99wt% of zinc.

[0041] In this embodiment, the zinc bath alloy manufacturing process is simple, the manufacturing cost is low, and the zinc bath alloy has few impurities. Therefore, in the subsequent hot dip galvanizing process, the zinc bath has good fluidity and strong adhesion, and the zinc coating thickness on the substrate surface is uniform, thereby enhancing the corrosion resistance and mechanical properties of the metal plated parts.

[0042] In this embodiment, a galvanizing method is provided, comprising: melting a zinc bath alloy into a zinc bath; immersing a substrate in the zinc bath for hot-dip galvanizing treatment to obtain a metal plated part with a hot-dip galvanized layer.

[0043] Among them, the ratio of the zinc bath alloy is 1: aluminum 0.005wt%-0.015wt%, silicon 0.0006wt%-0.0018wt%, titanium 0.0002wt%-0.005wt%, magnesium 0.01wt%-0.05wt%, zinc 0.90wt%-0.98wt%.

[0044] Proportion 2 of the zinc bath alloy: 0.005wt%-0.015wt% of aluminum, 0.0006wt%-0.0018wt% of silicon, 0.0002wt%-0.005wt% of titanium, and 0.95wt%-0.99wt% of zinc.

[0045] Specifically, the substrate can be a structural part that requires high temperature galvanizing, such as a fastener, a cable, a grid, a plate, a pipe, etc. The substrate can be selected according to actual needs, and the embodiments of the present application do not make specific limitations.

[0046] In this embodiment, due to the addition of appropriate amounts of Al, Si, and Ti elements to the zinc bath alloy. The trace amounts of Si and Ti are used to promote the orderly homogeneous crystallization and solidification of the coating to form fine equiaxed crystals, thereby achieving uniform corrosion of the coating during the corrosion process, eliminating the excessively fast local corrosion of the coating and extending the service life of the metal plated parts. Further, the trace amounts of Al and Si elements can form intermetallic compounds with the free Fe in the zinc bath to effectively control and reduce the Fe content in the zinc bath, effectively preventing Fe from reacting with Zn in the zinc bath to form iron-zinc intermetallic compounds (zinc slag), thereby ensuring the smoothness and flatness of the zinc coating, and further improving the corrosion resistance of the zinc coating. At the same time, the zinc bath fluidity can be improved by the synergistic effect of trace Al, Si, and Ti elements, the thickness of the zinc coating can be reduced while ensuring the uniformity of the zinc coating, and the adhesion of the coating is increased, so that the surface of the zinc coating is bright and clean. The trace amount of Mg element further improves the compactness and adhesion of the corrosion products of the coating, further improves the corrosion resistance of the coating, and extends the service life of the metal plated parts. Thus, the corrosion resistance of the galvanized layer formed by hot-dip galvanizing of zinc bath alloy is more than twice that of the pure zinc coating of the same thickness in the prior art.

[0047] Further, as a refinement and expansion of the specific implementation method of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, the hot-dip galvanizing treatment process parameters specifically include: treatment temperature of 480°C-510°C, galvanizing time of 1min-2min, and air cooling time of 15s-30s.

[0048] Among them, air cooling time refers to the time for the plated parts to cool naturally in the air after being taken out of the zinc bath during the hot-dip galvanizing process.

[0049] In this embodiment, under the requirement of high temperature galvanizing, the galvanizing zinc bath can maintain a certain fluidity, which can effectively solve the corrosion life of metal plated parts, and at the same time increase the adhesion of the coating, and the corrosion resistance of the coating is more than twice that of the pure zinc coating of the same thickness. In addition, under the appropriate air cooling time, the iron-zinc alloy layer in the galvanized layer can be reasonably grown and distributed, ensuring the corrosion resistance, hardness and adhesion of the galvanized layer.

[0050] Furthermore, the thickness of the hot-dip galvanized layer of the metal plated part obtained by the embodiment of the present application is 5 μm-20 μm.

[0051] It should be noted that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0052] It is understood that after the metal plated part is cooled, the metal plated part can be placed in a centrifuge for centrifugal treatment to remove excess zinc on the surface of the metal plated part.

[0053] For a specific example, a fastener is used as the substrate for description.

[0054] Embodiment 1:

[0055] Based on the total mass of the hot-dip zinc alloy, the fastener galvanizing zinc bath contains 0.008wt% Al, 0.001wt% Si, 0.00025wt% Ti, 0.05wt% Mg, and the balance is Zn and unavoidable impurities. In the hot-dip zinc bath, the temperature is controlled at 480℃-510℃, the galvanizing time is 1-2 minutes, the air cooling time is 15-30 seconds, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0056] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q235 material. The bolts and nuts are well assembled, the coating is bright and smooth, and the adhesion test is good.

[0057] Embodiment 2:

[0058] Based on the total mass of the hot-dip zinc alloy, the fastener galvanizing zinc bath contains 0.012wt% Al, 0.0015wt% Si, 0.0004wt% Ti, 0.03wt% Mg, and the balance is Zn and unavoidable impurities. In the hot-dip zinc bath, the temperature is controlled at 480℃-510℃, the galvanizing time is 1-2 minutes, the air cooling time is 15-30 seconds, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0059] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q345 material. The bolts and nuts are well assembled, the coating is bright and smooth, and the adhesion test is good.

[0060] Embodiment 3:

[0061] Based on the total mass of the hot-dip zinc alloy, the fastener galvanizing zinc bath contains 0.015wt% Al, 0.0018wt% Si, 0.005wt% Ti, 0.05wt% Mg, and the balance is Zn and unavoidable impurities. In the hot-dip zinc bath, the temperature is controlled at 480℃-510℃, the galvanizing time is 1-2 minutes, the air cooling time is 15-30 seconds, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0062] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q355 material. The bolts and nuts are well assembled, the coating is bright and smooth, and the adhesion test is good.

[0063] Embodiment 4:

[0064] Based on the total mass of the hot-dip zinc alloy, the fastener galvanizing zinc bath contains 0.015wt% Al, 0.005wt% Al, 0.0006wt% Si, 0.0002wt% Ti, 0.01wt% Mg, and the balance is Zn and unavoidable impurities. In the hot-dip zinc bath, the temperature is controlled at 480℃-510℃, the galvanizing time is 1-2 minutes, the air cooling time is 15-30 seconds, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0065] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q355 material. The bolts and nuts are well assembled, the coating is bright and smooth, and the adhesion test is good.

[0066] Embodiment 5:

[0067] Based on the total mass of the hot-dip zinc alloy, the fastener galvanizing zinc bath contains 0.015wt% Al, 0.01wt% Al, 0.0008wt% Si, 0.0015wt% Ti, and the balance is Zn and unavoidable impurities. In the hot-dip zinc bath, the temperature is controlled at 480℃-510℃, the galvanizing time is 1-2 minutes, the air cooling time is 15-30 seconds, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0068] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q235 material. The bolts and nuts are well assembled, the coating is bright and smooth, and the adhesion test is good.

[0069] Comparative Example 1:

[0070] Based on the total mass of the hot-dip zinc alloy, the fastener galvanizing zinc bath contains 0.003wt% Al, 0.0003wt% Si, 0.0001wt% Ti, 0.5wt% Mg, and the balance is Zn and unavoidable impurities. In the hot-dip zinc bath, the temperature is controlled at 480℃-510℃, the galvanizing time is 1-2 minutes, the air cooling time is 15-30 seconds, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0071] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q355 material, and the bolts and nuts are well assembled, and the coating is bright and smooth.

[0072] Comparative Example 2:

[0073] Based on the total mass of the hot-dip zinc alloy, the fastener galvanizing zinc bath contains 0.003wt% Al, 0.02wt% Al, 0.0015wt% Si, 0.0004wt% Ti, 0.5wt% Mg, and the balance is Zn and unavoidable impurities. In the hot-dip zinc bath, the temperature is controlled at 480℃-510℃, the galvanizing time is 1-2 minutes, the air cooling time is 15-30 seconds, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0074] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q355 material. The bolts and nuts are well assembled, and fewer particles and more obvious flow marks appear on the surface of the coating.

[0075] Comparative Example 3:

[0076] Based on the total mass of hot-dip zinc alloy, the zinc bath for fastener galvanizing contains 0.002wt% Al, and the balance is Zn and unavoidable impurities. In the hot-dip zinc bath, the temperature is controlled at 450°C, the galvanizing time is 50s, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0077] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q355 material. The bolts and nuts are well assembled and a large number of particles appear on the surface of the coating.

[0078] Comparative Example 4:

[0079] Based on the total mass of hot-dip zinc alloy, the fastener galvanizing zinc bath contains 0.002wt% Al, 0.03wt% Ni, 0.01wt% RE and inevitable impurities. In the hot-dip zinc bath, the temperature is controlled at 510°C, the galvanizing time is 1.5 minutes, and then the galvanized parts are placed in a centrifuge for centrifugal removal of excess zinc on the surface of the galvanized parts to obtain galvanized fasteners that can be assembled and meet the service life of matching connectors.

[0080] The fastener galvanizing zinc bath of this embodiment is used to hot-dip galvanize bolts and nuts made of Q355 material, and the bolts and nuts are well assembled, and the coating is bright and smooth.

[0081] The metal plated parts obtained in Examples 1 to 5 and the metal plated parts obtained in Comparative Examples 1 to 4 were subjected to a salt spray test in a 10 wt % sodium chloride solution in a salt spray test chamber. The corrosion time required for different metal plated parts with the same corrosion area in the salt spray test is as follows: Figure 1 As shown. In comparative example 1, the metal-plated part is subjected to 360 hours and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appear. In comparative example 2, the metal-plated part is subjected to 160 hours and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appear. In comparative example 3, the metal-plated part is subjected to 220 hours and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appear. In comparative example 4, the metal-plated part is subjected to 320 hours and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appear. In example 1, the metal-plated part is subjected to 660 hours and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appear. In example 2, the metal-plated part is subjected to 605 hours and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appear. In example 3, the metal-plated part is subjected to 740 hours and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appear. In example 4, the metal-plated part is subjected to 560 hours and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appear. In Example 5, the metal plated part was subjected to 610 hours of rust and rust spots with an area of ​​more than 5% (total area of ​​the test piece) appeared.

[0082] It can be seen that compared with the pure zinc coating of the same thickness, the corrosion resistance of the zinc coating of the metal plated parts prepared in Examples 1 to 5 is 2.8 times, 2.5 times, 3.2 times, 2.3 times, and 2.5 times that of the pure zinc coating, respectively. The corrosion resistance of the zinc coating of the metal plated parts prepared in Comparative Examples 1 to 4 is 1.8 times, 0.8 times, 1.1 times, and 1.6 times that of the pure zinc coating, respectively. This proves that the zinc bath alloy formula provided in the present application has good corrosion resistance.

[0083] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0084] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A zinc bath alloy, characterized in that: The zinc bath alloy comprises: Aluminum 0.005wt%-0.015wt%, Silicon 0.0006wt%-0.0018wt%, Titanium 0.0002wt%-0.005wt%, zinc 0.95wt%-0.99wt%.

2. The zinc bath alloy according to claim 1, characterized in that: The zinc bath alloy comprises: Aluminum 0.005wt%-0.015wt%, Silicon 0.0006wt%-0.0018wt%, Titanium 0.0002wt%-0.005wt%, magnesium 0.01wt%-0.05wt%, zinc 0.90wt%-0.98wt%.

3. The zinc bath alloy according to claim 2, characterized in that: The zinc bath alloy comprises: Aluminum 0.012wt%-0.015wt%, silicon 0.001wt%-0.0018wt%, titanium 0.0004wt%-0.004wt%, magnesium 0.03wt%-0.05wt%, zinc 0.92wt%-0.955wt%.

4. A method for preparing a zinc bath alloy, characterized in that: The method comprises: Aluminum, silicon, titanium and zinc are added into a melting pot according to the proportion of the zinc bath alloy as described in any one of claims 1 to 3, and heated to obtain an alloy melt, wherein the heating time is 3h-4h and the heating temperature is 600°C-700°C; filtering impurities in the alloy melt; The filtered alloy melt is poured into a casting mold and cooled at room temperature to form a block-shaped zinc bath alloy.

5. A galvanizing method, characterized in that: The method comprises: Melting the zinc bath alloy according to any one of claims 1 to 3 into a zinc bath; The substrate is immersed in the zinc bath for hot-dip galvanizing treatment to obtain a metal plated part with a hot-dip galvanized layer.

6. The galvanizing method according to claim 5, characterized in that: The treatment temperature of the hot-dip galvanizing treatment is 480° C.-510° C., the galvanizing time is 1 min.-2 min., and the air cooling time is 15 s.-30 s.

7. The galvanizing method according to claim 5, characterized in that: The thickness of the hot-dip galvanized layer is 5 μm-20 μm.

8. The galvanizing method according to claim 5, characterized in that: The method further comprises: The metal plated part is placed in a centrifuge for centrifugal treatment to remove excess zinc on the surface of the metal plated part.

9. The galvanizing method according to claim 5, characterized in that: The base materials include fasteners, cables, grids, plates and pipes.

10. A metal plated part, characterized in that: The metal plated part is made by the galvanizing method according to any one of claims 5 to 9.

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