CN113528764A - Method for improving quality of passivation film of galvanized product - Google Patents
Method for improving quality of passivation film of galvanized product Download PDFInfo
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- CN113528764A CN113528764A CN202110613459.9A CN202110613459A CN113528764A CN 113528764 A CN113528764 A CN 113528764A CN 202110613459 A CN202110613459 A CN 202110613459A CN 113528764 A CN113528764 A CN 113528764A
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- roll
- passivation
- roughness
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- coater
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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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
- 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
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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
- 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
- C23C22/73—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 characterised by the process
- C23C22/77—Controlling or regulating of the coating process
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
Abstract
The invention discloses a method for improving the quality of a passivation film of a galvanized product, which comprises the following steps: the strip steel sequentially passes through a continuous annealing furnace, a zinc pot, a finishing machine and a roller coater; carrying out a passivation process on the roller coater; the roughness of the working roll of the finishing machine is 0.3-0.5 mu m, and the roughness of the material lifting roll of the roller coater is less than or equal to 0.03 mu m. The obtained galvanized product has excellent surface quality, no defects such as passivation spots, passivation patterns and the like, uniform passivation film and compact structure.
Description
Technical Field
The invention belongs to the technical field of steel plate surface treatment, and particularly relates to a method for improving the quality of a passivation film of a galvanized product.
Background
The hot-dip galvanized sheet has better corrosion resistance, and is widely applied to the manufacturing fields of buildings, household appliances, automobiles, aviation and the like. However, galvanized products are still easy to corrode when used in air, especially in a humid environment, and the coating is oxidized to cause the defect of white rust on the surface, so that the galvanized steel plate needs to be subjected to post-treatment to further improve the corrosion resistance of the products.
The current post-treatment method for producing high-quality galvanized plates usually adopts a roller coating method for passivation treatment, namely, a group of rubber rollers or steel rollers are combined, different transfer methods are adopted to enable passivation liquid to be leveled and arranged, and finally the passivation liquid is uniformly transferred onto moving strip steel and then solidified, so that a layer of passivation film is formed on the surface of the strip steel, and the thickness and uniformity of the film are one of the main factors influencing the corrosion resistance of a passivation product. For the passivated surface, the passivated spots and the passivated patterns are common surface defects, which seriously restricts the use and development of trivalent chromium passivated products, in order to reduce the passivated surface defects, passivating liquid with higher quality requirements is usually selected, and a finishing machine working roll, a roll coater lifting roll and a coating roll are frequently and periodically replaced, so that the production cost is greatly improved, and the production efficiency is reduced.
In summary, the following problems exist in the prior art: the production efficiency is low, and the defects of passivation spots, passivation patterns and the like are common on the passivated surface.
Disclosure of Invention
The invention aims to solve the technical problems of low production efficiency and common defects of passivation spots, passivation patterns and the like on a passivation surface.
In order to achieve the above object, an embodiment of the present invention provides a method for improving the quality of a passivation film of a galvanized product, the method including:
the strip steel sequentially passes through a continuous annealing furnace, a zinc pot, a finishing machine and a roller coater;
carrying out a passivation process on the roller coater;
the roughness of the working roll of the finishing machine is 0.3-0.5 mu m, and the roughness of the material lifting roll of the roller coater is less than or equal to 0.03 mu m.
Specifically, the roughness of the working roll of the finisher is 0.33 μm, and the roughness of the lifting roll of the roll coater is 0.02 μm.
Specifically, the roughness of the working roll of the finisher is 0.35 μm, and the roughness of the material lifting roll of the roller coater is 0.03 μm.
Specifically, the roughness of the working roll of the finisher is 0.42 μm, and the roughness of the lifting roll of the roll coater is 0.02 μm.
Specifically, the rotation speed ratio of a lifting roller and a coating roller adopted in the passivation process of the roller coater is 0.5, the rotation speed ratio of the coating roller is 1.0, the pressure between the lifting roller and the coating roller is 300kg, and the biting depth of the coating roller is 15.2 mm.
According to the method for improving the quality of the passivation film of the galvanized product, the obtained galvanized product has excellent surface quality, no defects such as passivation spots and passivation patterns, uniform passivation film and compact structure. According to the invention, a passivation product with better surface quality can be produced only by optimizing and adjusting the roughness of the finishing machine working roll and the roll coater lifting roll, a passivation solution with specific components is not required to be selected, the service cycle of the finishing machine working roll, the roll coater lifting roll and the coating roll is obviously prolonged after optimization, the production efficiency is greatly improved, and the defects of passivation spots, passivation patterns and the like on the passivation surface can be obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram of the surface condition of a product in example 1 of a method for improving the quality of a passivation film of a galvanized product according to an embodiment of the invention;
FIG. 2 is a diagram of the surface condition of a product in example 2 of a method for improving the quality of a passivation film of a galvanized product according to an embodiment of the invention;
FIG. 3 is a diagram of the surface condition of a product in example 3 of a method for improving the quality of a passivation film of a galvanized product according to an embodiment of the invention;
FIG. 4 is a surface condition diagram of a product provided in comparative example 1 of the present invention;
FIG. 5 is a surface condition diagram of a product provided in comparative example 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
The invention provides a method for improving the quality of a passivation film of a galvanized product, as shown in figure 1, strip steel passes through a continuous annealing furnace and a zinc pot and then reaches a finishing machine, and the finishing machine finishes and then reaches a roller coater for passivation. The rotating speed ratio of a material lifting roller and a coating roller adopted in the passivation process is 0.5, the rotating speed ratio of the coating roller is 1.0, the pressure between the material lifting roller and the coating roller is 300kg, and the biting depth of the coating roller is 15.2 mm; the roughness Ra of the working roll of the finishing machine is adjusted to 0.3-0.5 mu m from the original 0.9-1.3 mu m, and the roughness Ra of the lifting roll of the roller coater is adjusted to be less than or equal to 0.03 mu m from the original 0.5-0.7 mu m.
For the finished surface, if the roughness is too high, the surface is too uneven, and the passivating agent cannot be uniformly coated on the uneven part of the steel plate; if the roughness of the material lifting roller is too high, when the passivation solution is brought into the coating roller made of the glue material, the distribution of the passivation solution on the coating roller is not uniform, and finally the thickness of the passivation film on the strip steel is also not uniform.
According to the method for improving the quality of the passivation film of the galvanized product, the obtained galvanized product has excellent surface quality, no defects such as passivation spots and passivation patterns, uniform passivation film and compact structure. According to the invention, a passivation product with better surface quality can be produced only by optimizing and adjusting the roughness of the finishing machine working roll and the roll coater lifting roll, a passivation solution with specific components is not required to be selected, the service cycle of the finishing machine working roll, the roll coater lifting roll and the coating roll is obviously prolonged after optimization, the production efficiency is greatly improved, and the defects of passivation spots, passivation patterns and the like on the passivation surface can be obviously improved.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood 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 (b):
table 1 shows the roughness of the work roll of the finisher and the specific roughness of the material lifting roll of the roll coater in the examples and the comparative examples, fig. 1 shows the surface condition of example 1, fig. 2 shows the surface condition of example 2, and fig. 3 shows the surface condition of example 3; no passivation spots, passivation patterns and other defects exist on the surface.
FIG. 4 is the surface condition of comparative example 1, and FIG. 5 is the surface condition of comparative example 2; has defects such as passivated patterns and the like.
TABLE 1 specific Process parameters for each of the examples and comparative examples
| Examples of the invention | Roughness Ra, mum of working roll of finishing machine | Roughness Ra, mum of material lifting roller of roller coater | A defect ratio% |
| Example 1 | 0.33 | 0.02 | 1.23 |
| Example 2 | 0.35 | 0.03 | 1.27 |
| Example 3 | 0.42 | 0.02 | 2.35 |
| Comparative example 1 | 0.97 | 0.54 | 43 |
| Comparative example 2 | 1.23 | 0.66 | 52 |
According to the method for improving the quality of the passivation film of the galvanized product, the obtained galvanized product has excellent surface quality, no defects such as passivation spots and passivation patterns, uniform passivation film and compact structure. According to the invention, a passivation product with better surface quality can be produced only by optimizing and adjusting the roughness of the finishing machine working roll and the roll coater lifting roll, a passivation solution with specific components is not required to be selected, the service cycle of the finishing machine working roll, the roll coater lifting roll and the coating roll is obviously prolonged after optimization, the production efficiency is greatly improved, and the defects of passivation spots, passivation patterns and the like on the passivation surface can be obviously improved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A method for improving the quality of a passivation film of a galvanized product, which is characterized by comprising the following steps:
the strip steel sequentially passes through a continuous annealing furnace, a zinc pot, a finishing machine and a roller coater;
carrying out a passivation process on the roller coater;
the roughness of the working roll of the finishing machine is 0.3-0.5 mu m, and the roughness of the material lifting roll of the roller coater is less than or equal to 0.03 mu m.
2. The method for improving the quality of the passive film of the galvanized product according to claim 1, wherein the roughness of the smoothing machine working roll is 0.33 μm, and the roughness of the roll coater lifting roll is 0.02 μm.
3. The method for improving the quality of the passive film of the galvanized product according to claim 1, wherein the roughness of the finishing machine working roll is 0.35 μm, and the roughness of the roll coater lifting roll is 0.03 μm.
4. The method for improving the quality of the passive film of the galvanized product according to claim 1, wherein the roughness of the smoothing machine working roll is 0.42 μm, and the roughness of the roll coater lifting roll is 0.02 μm.
5. The method for improving the quality of the passivation film of the galvanized product according to the claim 1, characterized in that the rotation speed ratio of the lifting roll and the coating roll used in the passivation process of the roll coater is 0.5, the rotation speed ratio of the coating roll is 1.0, the pressure between the lifting roll and the coating roll is 300kg, and the biting depth of the coating roll is 15.2 mm.
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| CN202110613459.9A CN113528764B (en) | 2021-06-02 | 2021-06-02 | Method for improving quality of passivation film of galvanized product |
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