CN114941116A - Preparation method of hot-dip galvanized steel plate - Google Patents

Preparation method of hot-dip galvanized steel plate Download PDF

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Publication number
CN114941116A
CN114941116A CN202210608720.0A CN202210608720A CN114941116A CN 114941116 A CN114941116 A CN 114941116A CN 202210608720 A CN202210608720 A CN 202210608720A CN 114941116 A CN114941116 A CN 114941116A
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hot
attapulgite
dip galvanized
galvanized steel
low
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CN202210608720.0A
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马金锋
黄栋梁
葛建峰
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Nantong Oge Electric Technology Co ltd
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Nantong Oge Electric Technology Co ltd
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Publication of CN114941116A publication Critical patent/CN114941116A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C2/04—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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C2/26—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

The invention relates to a preparation method of a hot-dip galvanized steel sheet, belonging to the technical field of metal materials and comprising the following steps: sanding low-carbon steel with sand paper, degreasing with NaOH solution, pickling with HCl solution, and then using NH 4 Carrying out fluxing on the sample by using the Cl solution to obtain pretreated low-carbon steel; dipping the pretreated low-carbon steel sample into a molten zinc ingot bath, taking out the sample from the molten zinc ingot bath after the dipping is finished, and blowing off redundant zinc by hot air to obtain a crude product; mixing attapulgite with sandDispersing the phytic acid nano particles in deionized water to obtain a dispersion liquid, immersing the crude product into the dispersion liquid, taking out and drying to obtain the hot-dip galvanized steel plate. In the technical scheme of the invention, the attapulgite loaded with the phytic acid is attached to the low-carbon steel in a dipping mode to form a complex film, so that the protection effect on internal Zn and low-carbon steel is realized, and more (002) textures can be reserved on the surface of Zn, thereby being beneficial to improving the corrosion resistance of Zn.

Description

Preparation method of hot-dip galvanized steel plate
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a preparation method of a hot-dip galvanized steel plate.
Background
Low carbon steel is the most commonly used metal in almost all industries, including electrical, architectural, and automotive applications, because of its excellent mechanical properties, economic viability, sustainability, recyclability, and durability. However, it is susceptible to corrosion, leading to serious economic and ecological problems. Among the different methods of protecting steel against corrosion, hot dip galvanizing is an economical, effective and direct method, which protects the metal against corrosion by a physical barrier effect and a sacrificial anode effect, and after exiting the bath, the hot dip galvanized steel strip enters an alloying furnace to be reheated, so that the iron element diffuses into the zinc layer and a uniform zinc-iron alloy layer is formed on the coil, which is a zinc-iron alloy hot dip galvanized steel sheet.
However, this sacrificial anode protection method does not provide long lasting corrosion protection.
Disclosure of Invention
The invention aims to provide a preparation method of a hot-dip galvanized steel sheet, wherein an attapulgite-phytic acid composite film is coated on the surface of a zinc layer, so that air is isolated, and the zinc layer is prevented from being oxidized.
The technical problems to be solved by the invention are as follows: the sacrificial anode protection method does not provide long lasting corrosion protection.
The purpose of the invention can be realized by the following technical scheme:
a method for manufacturing a hot-dip galvanized steel sheet, comprising the steps of:
s1, sanding the low-carbon steel by using sand paper, degreasing by using NaOH solution, pickling by using HCl solution, and then using NH 4 Carrying out fluxing on the sample by using the Cl solution to obtain pretreated low-carbon steel;
s2, dipping the pretreated low-carbon steel sample into a molten zinc ingot bath, taking out the sample from the molten zinc ingot bath after the dipping is finished, and blowing off redundant zinc through hot air to obtain a crude product;
s3, ultrasonically dispersing the attapulgite-phytic acid nanoparticles in deionized water to obtain a dispersion liquid, immersing the crude product in the dispersion liquid, taking out and drying to obtain the hot-dip galvanized steel plate.
Further, in step S1, the NaOH solution is 5% by mass, the HCl solution is 8% by volume, and NH is added 4 The volume fraction of the Cl solution was 30%.
Further, in step S1, the low-carbon steel is 304 stainless steel.
Further, in step S2, the molten zinc ingot includes, in mass percent: al: 3-5%, Mg: 1-3%, Ti: 0.001-0.1%, B: 0.001-0.045%, and the balance of Zn and inevitable impurities.
Further, in step S2, the bath of molten zinc ingot is at a temperature of 480 ℃ and the dipping time is 15 to 30 seconds.
Further, in step S3, the attapulgite-phytic acid nanoparticles are prepared by the following steps:
a1, dispersing attapulgite in deionized water, stirring at room temperature to form a uniform dispersion, then performing centrifugal separation to obtain a solid, washing with ethanol, acetone and deionized water, and then re-dispersing in deionized water to obtain attapulgite hydrogel, wherein the dosage ratio of the attapulgite to the deionized water is 3-6 g: 450-500 mL;
in the reaction process, the attapulgite is dispersed in deionized water to form a 5 wt% attapulgite hydrogel system.
A2, stirring the attapulgite hydrogel and phytic acid at room temperature, adding ammonia water to adjust the pH value, then pouring into a stainless steel autoclave lined with teflon, carrying out hydrothermal treatment at 180 ℃ for 24 hours, cooling to room temperature after the reaction is finished, filtering, washing and drying at 80 ℃ to obtain the attapulgite-phytic acid nanoparticles, wherein the dosage ratio of the attapulgite hydrogel, the phytic acid and the ammonia water is 4-6 g: 20-30 mL: 10-20 mL.
In a hydrothermal system, oxygen-containing functional groups in phytic acid are chelated with Si and Al in attapulgite, so that the phytic acid is loaded on the surface of the attapulgite.
The invention has the beneficial effects that:
in the technical scheme of the invention, phytic acid (C) is used 6 H 18 O 24 P 6 Is aThe natural antioxidant is a sustainable organic acid containing 6 phosphoric carboxyl groups and 12 hydroxyl groups, has the inherent metal chelating capacity of forming a phytic acid-metal complex), and has oxygen-containing functional groups chelated with Si and Al in attapulgite, so that the phytic acid is loaded on the attapulgite, and the attapulgite loaded with the phytic acid is attached to low-carbon steel in a dipping mode, and the main process is as follows: the phytic acid on the surface of the attapulgite dispersed in a water system has acidity, so that a replacement reaction (Zn + 2H) can occur on the surface of a zinc layer + →Zn 2+ +H 2 ×) and simultaneously, Zn generated 2+ The phytic acid-Zn complex film which is coordinated with phytic acid molecules to form a layered structure realizes the protection effect on internal Zn and low-carbon steel, and the attapulgite adsorbed in the attapulgite phytic acid-Zn complex film can also play a role in increasing the mechanical property of the film; in addition, due to the fact that the Zn dissolution activation energy of the Zn surface (101) texture is low, phytic acid molecules tend to react with the Zn surface (101) texture, an amorphous structure is presented on the Zn surface and a phytic acid composite interface layer, more (002) textures can be reserved on the Zn surface, and the improvement of the anticorrosion performance of Zn is facilitated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The attapulgite-phytic acid nano particle is prepared by the following steps:
a1, dispersing 3g of attapulgite in 450mL of deionized water, stirring at room temperature to form a uniform dispersion, then carrying out centrifugal separation to obtain a solid, washing with ethanol, acetone and deionized water, and then dispersing in deionized water to obtain attapulgite hydrogel;
a2, stirring 4g of attapulgite hydrogel and 20mL of phytic acid at room temperature, adding 10mL of ammonia water to adjust the pH value, then pouring into a stainless steel autoclave lined with teflon, carrying out hydrothermal treatment at 180 ℃ for 24h, cooling to room temperature after the reaction is finished, filtering, washing and drying at 80 ℃ to obtain the attapulgite-phytic acid nanoparticles.
Example 2
The attapulgite-phytic acid nano particle is prepared by the following steps:
a1, dispersing 5g of attapulgite in 470mL of deionized water, stirring at room temperature to form a uniform dispersion, then carrying out centrifugal separation to obtain a solid, washing with ethanol, acetone and deionized water, and then re-dispersing in deionized water to obtain attapulgite hydrogel;
a2, stirring 5g of attapulgite hydrogel and 25mL of phytic acid at room temperature, adding 15mL of ammonia water to adjust the pH value, then pouring into a stainless steel autoclave lined with teflon, carrying out hydrothermal treatment at 180 ℃ for 24h, cooling to room temperature after the reaction is finished, filtering, washing and drying at 80 ℃ to obtain the attapulgite-phytic acid nanoparticles.
Example 3
The attapulgite-phytic acid nano particle is prepared by the following steps:
a1, dispersing 6g of attapulgite in 500mL of deionized water, stirring at room temperature to form a uniform dispersion, then carrying out centrifugal separation to obtain a solid, washing with ethanol, acetone and deionized water, and then dispersing in deionized water to obtain attapulgite hydrogel;
a2, stirring 6g of attapulgite hydrogel and 30mL of phytic acid at room temperature, adding 20mL of ammonia water to adjust the pH value, then pouring into a stainless steel autoclave lined with teflon, carrying out hydrothermal treatment at 180 ℃ for 24h, cooling to room temperature after the reaction is finished, filtering, washing and drying at 80 ℃ to obtain the attapulgite-phytic acid nanoparticles.
Comparative example 1
The comparative example is different from example 3 in that phytic acid was used without adding attapulgite.
Example 4
A method for manufacturing a hot-dip galvanized steel sheet, comprising the steps of:
s1, sanding 304 stainless steel, degreasing by using NaOH solution with the mass fraction of 5%, acid-washing by using HCl solution with the volume fraction of 8%, and then using NH with the volume fraction of 30% 4 Carrying out fluxing on the sample by using the Cl solution to obtain pretreated low-carbon steel;
s2, dipping the pretreated low-carbon steel sample into a molten zinc ingot bath at 480 ℃ for 15S, taking out the sample from the molten zinc ingot bath after dipping, and blowing off redundant zinc by hot air to obtain a crude product;
s3, ultrasonically dispersing the attapulgite-phytic acid nano particles prepared in the embodiment 1 in deionized water to obtain a dispersion liquid, immersing the crude product in the dispersion liquid, taking out and drying to obtain the hot-dip galvanized steel plate.
Example 5
A method for manufacturing a hot-dip galvanized steel sheet, comprising the steps of:
s1, sanding 304 stainless steel with sand paper, degreasing with 5% NaOH solution, acid-washing with 8% HCl solution, and then washing with 30% NH 4 Carrying out fluxing on the sample by using the Cl solution to obtain pretreated low-carbon steel;
s2, dipping the pretreated low-carbon steel sample into a molten zinc ingot bath at 480 ℃ for 20S, taking out the sample from the molten zinc ingot bath after the dipping is finished, and blowing off redundant zinc by hot air to obtain a crude product;
s3, ultrasonically dispersing the attapulgite-phytic acid nano particles prepared in the embodiment 2 in deionized water to obtain a dispersion liquid, immersing the crude product in the dispersion liquid, taking out and drying to obtain the hot-dip galvanized steel plate.
Example 6
A method for manufacturing a hot-dip galvanized steel sheet, comprising the steps of:
s1, sanding 304 stainless steel with sand paper, degreasing with 5% NaOH solution, acid-washing with 8% HCl solution, and then washing with 30% NH 4 Carrying out fluxing on the sample by using the Cl solution to obtain pretreated low-carbon steel;
s2, dipping the pretreated low-carbon steel sample into a molten zinc ingot bath at 480 ℃ for 30S, taking out the sample from the molten zinc ingot bath after dipping, and blowing off redundant zinc by hot air to obtain a crude product;
s3, ultrasonically dispersing the attapulgite-phytic acid nanoparticles prepared in the embodiment 3 in deionized water to obtain a dispersion liquid, immersing the crude product in the dispersion liquid, taking out and drying to obtain the hot-dip galvanized steel plate.
Comparative example 2
The present comparative example is different from example 6 in that the attapulgite-phytic acid nanoparticles prepared in example 3 were replaced with the materials of comparative example 1, and the other steps and raw materials were synchronized with example 6.
The hot-dip galvanized steel sheets prepared in examples 4 to 6 and comparative example 2 were subjected to the performance test, and the test results are shown in table 1 below.
TABLE 1
Item Corrosion potential/V Corrosion current/mA cm -3
Example 4 -0.922 0.37
Example 5 -0.923 0.32
Example 6 -0.921 0.31
Comparative example 2 -1.037 0.97
It can be understood from table 1 above that the hot-dip galvanized steel sheets prepared in the examples of the present invention have better corrosion prevention properties than the comparative examples.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (8)

1. A method for producing a hot-dip galvanized steel sheet, characterized by: the method comprises the following steps:
s1, sanding the low-carbon steel with sand paper, degreasing the low-carbon steel with NaOH solution, pickling the low-carbon steel with HCl solution, and then using NH 4 Carrying out fluxing on the sample by using the Cl solution to obtain pretreated low-carbon steel;
s2, dipping the pretreated low-carbon steel sample into a molten zinc ingot bath, taking out the sample from the molten zinc ingot bath after the dipping is finished, and blowing off redundant zinc through hot air to obtain a crude product;
s3, ultrasonically dispersing the attapulgite-phytic acid nano particles in deionized water to obtain a dispersion liquid, immersing the crude product in the dispersion liquid, taking out and drying to obtain the hot-dip galvanized steel plate.
2. The method of manufacturing a hot-dip galvanized steel sheet according to claim 1, characterized in that: in step S1, the mass fraction of NaOH solution is 5%, the volume fraction of HCl solution is 8%, and NH is added 4 The volume fraction of the Cl solution was 30%.
3. The method of manufacturing a hot-dip galvanized steel sheet according to claim 1, characterized in that: in step S1, the low carbon steel is 304 stainless steel.
4. The method of manufacturing a hot-dip galvanized steel sheet according to claim 1, characterized in that: in step S2, the molten zinc ingot includes, in mass percent: al: 3-5%, Mg: 1-3%, Ti: 0.001-0.1%, B: 0.001-0.045%, and the balance of Zn and inevitable impurities.
5. The method of manufacturing a hot-dip galvanized steel sheet according to claim 1, characterized in that: in step S2, the molten zinc ingot bath is at a temperature of 480 ℃ and the dipping time is 15-30S.
6. The method of manufacturing a hot-dip galvanized steel sheet according to claim 1, characterized in that: in step S3, the attapulgite-phytic acid nanoparticles are prepared by the following steps:
a1, dispersing attapulgite in deionized water, stirring at room temperature to form a uniform dispersion, then carrying out centrifugal separation to obtain a solid, washing with ethanol, acetone and deionized water, and then dispersing in deionized water to obtain attapulgite hydrogel;
a2, stirring the attapulgite hydrogel and phytic acid at room temperature, adding ammonia water to adjust the pH value, then pouring into a stainless steel autoclave lined with teflon, carrying out hydrothermal treatment at 180 ℃ for 24 hours, cooling to room temperature after the reaction is finished, filtering, washing and drying at 80 ℃ to obtain the attapulgite-phytic acid nanoparticles.
7. The method of manufacturing a hot-dip galvanized steel sheet according to claim 6, characterized in that: in the step A1, the dosage ratio of the attapulgite to the deionized water is 3-6 g: 450 and 500 mL.
8. The method of manufacturing a hot-dip galvanized steel sheet according to claim 6, characterized in that: in the step A2, the dosage ratio of the attapulgite hydrogel to the phytic acid to the ammonia water is 4-6 g: 20-30 mL: 10-20 mL.
CN202210608720.0A 2022-05-31 2022-05-31 Preparation method of hot-dip galvanized steel plate Withdrawn CN114941116A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117966227A (en) * 2024-04-02 2024-05-03 临朐天泰德隆电镀股份有限公司 Method for electrogalvanizing steel plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117966227A (en) * 2024-04-02 2024-05-03 临朐天泰德隆电镀股份有限公司 Method for electrogalvanizing steel plate

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Application publication date: 20220826