CN113021194A - Method for preparing zinc-aluminum-magnesium alloy coating steel plate - Google Patents
Method for preparing zinc-aluminum-magnesium alloy coating steel plate Download PDFInfo
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- CN113021194A CN113021194A CN202011610192.XA CN202011610192A CN113021194A CN 113021194 A CN113021194 A CN 113021194A CN 202011610192 A CN202011610192 A CN 202011610192A CN 113021194 A CN113021194 A CN 113021194A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C11/00—Selection of abrasive materials or additives for abrasive blasts
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- 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
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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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
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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
- C23C2/34—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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating With Molten Metal (AREA)
Abstract
A method for preparing a zinc-aluminum-magnesium alloy coating steel plate belongs to the technical field of metal surface anticorrosion treatment. The method is characterized in that a high-pressure water nozzle is adopted to spray and hit a high-pressure solid-liquid two-phase flow mixture consisting of water and steel shots on the surface of a hot steel strip to achieve the purpose of removing scales, and then zinc-aluminum-magnesium alloy liquid is plated on the surface of a steel plate subjected to shot blasting treatment. The surface of the steel plate subjected to shot blasting is rough, so that the strength of a zinc-aluminum-magnesium alloy coating is improved, and the whole process is free of pickling links and is green and environment-friendly.
Description
Technical Field
The invention relates to a method for preparing a zinc-aluminum-magnesium alloy coating steel plate, belonging to the technical field of metal surface anticorrosion treatment.
Background
The surface anticorrosion treatment of the steel plate mainly comprises the following steps: the metal coating steel plate produced by the method has certain corrosion resistance, so the metal coating steel plate is widely applied to a plurality of industries such as automobiles, household electrical appliances, communication, photovoltaics, urban traffic and the like. Plays an important role in prolonging the service life of the steel plate and reducing the corrosion of the atmosphere or seawater to the steel. However, the existing products have three major problems, namely, the adhesion of the hot-dip coating is not strong, the bending resistance is not good, cracking and even falling of the coating occur at the bending position easily, the corrosion resistance of the single alloy coating is still to be further improved, the coating can be more compact by adopting the multi-element alloy, and the service life can be further improved. Thirdly, when the hot-dip coating steel plate is manufactured at present, the hot-rolled substrate used by the hot-dip coating steel plate is descaled and derusted by adopting an acid pickling process, and then the surface of the alloy liquid is coated, so that the surrounding environment is polluted inevitably, the generated waste acid needs to be treated, the enterprise burden is increased, and the cost is increased.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for preparing a zinc-aluminum-magnesium alloy coated steel plate, which can realize a method for preparing an alloy coated steel plate which ensures good coating adhesive force, stable anti-corrosion performance and environmental protection. The invention comprises the following contents:
a method for manufacturing a zinc-aluminum-magnesium alloy coating steel plate is characterized by comprising the following two steps:
1. the method comprises the following steps of performing shot blasting descaling by using a high-pressure water nozzle, fully mixing water and steel shots in the nozzle according to a certain proportion, increasing the pressure of a mixture of the water and the steel shots, performing jet blasting on the mixture of the water and the steel shots on the surface of a hot steel plate by using the high-pressure water nozzle, crushing oxide skin on the surface of the steel plate, separating the oxide skin from the surface of the steel plate, achieving the purpose of descaling, exposing the natural color of a steel substrate on the surface of the steel plate, and performing alloy liquid surface coating on the steel plate.
In particular, in the method for manufacturing the metal-coated steel plate by shot blasting descaling, high-pressure water solid-liquid two-phase flow containing a certain amount of steel shots is sprayed and hit on the surface of the hot steel strip through a high-pressure water nozzle, and the method is divided into 4 high-pressure water shot blasting descaling sections of a rough spraying section 1, a rough spraying section 2, a fine spraying section 1 and a fine spraying section 2, wherein:
(1) the rough spraying 1 section is that high-strength alloy cast angular steel shots with the grain diameter of 0.7-0.5mm and the Rockwell hardness of 50-60HRC and water are fully mixed according to the volume ratio of 20-30:100, then the mixture of the mixed water and the steel shots is sprayed and impacted on the surface of the steel plate through high-pressure water nozzles, the spraying amount of each high-pressure water nozzle is 6-8Kg/min, the pressure of the mixture of the water and the steel shots sprayed by the high-pressure water nozzles is 30-50MP, and the time of the steel plate passing through the rough spraying 1 section is 4-6 minutes; most of oxide scale on the surface of the hot strip is removed after 1 section of rough spraying, a shallow irregular pit is formed on the surface of the substrate, and a certain amount of oxide scale residue still exists in the pit;
(2) the coarse spraying 2 section is that high-strength alloy cast angular steel shots with the grain diameter of 0.35-0.45mm and the Rockwell hardness of 50-60HRC and water are fully mixed according to the volume ratio of 25-30:100, then the mixture of the water and the steel shots formed by fully mixing the water and the steel shots is sprayed and hit on a steel plate through a high-pressure water nozzle, the spraying amount of each high-pressure water nozzle is 5-6Kg/min, the pressure of the mixture of the water and the steel shots sprayed by the high-pressure water nozzle is 40-50MP, and the time of the steel plate passing through the coarse spraying 2 section is 4-6 minutes; after the rough spraying 2-section spraying striking treatment, residual iron oxide scales in pits on the surface of the steel plate are basically removed completely, and dense irregular pits with small areas and slightly deep depths are formed on the surface of the steel strip;
(3) the fine spraying section 1 is to fully mix 304 stainless steel round balls with the grain diameter of 0.30-0.40mm and the Rockwell hardness of 45-50HRC and water according to the volume ratio of 20-30:100, then to spray and strike the mixture of water and steel balls formed by fully mixing the water and the steel balls onto a steel plate through a high-pressure water nozzle, the spraying amount of each high-pressure water nozzle is 8-10Kg/min, the pressure of the mixture of water and steel balls sprayed by the high-pressure water nozzle is 30-40MP, and the time of the steel plate passing through the fine spraying section 1 is 4-6 minutes; after 1 section of fine spraying, the scales originally existing on the surface of the steel plate and formed by the iron scale are completely removed, and uniform arc-shaped pits are basically formed;
(4) the fine spraying 2 section is that the 304 stainless steel round shot with the grain diameter of 0.20-0.30mm and the Rockwell hardness of 40-45HRC and water are fully mixed according to the volume ratio of 30:100, then the mixture of the water and the steel shot formed by fully mixing the water and the steel shot is sprayed and hit on the steel plate through the high-pressure water nozzles, the spraying amount of each high-pressure water nozzle is 8-10Kg/min, the pressure of the mixture of the water and the steel shot sprayed by the high-pressure water nozzles is 30-40MP, and the time of the steel plate passing through the fine spraying 2 section is 4-6 minutes; after 2 sections of fine spraying, arc-shaped pits which are uniform, compact and uniform are formed on the surface of the steel plate.
2. And (3) hot dip coating, further cleaning the steel plate surface subjected to shot blasting treatment by adopting a polyamide fiber nylon brush roller, ensuring that the surface cleanliness of the steel plate is below 200mmg/m2, and then performing the following treatment:
(1) the plating assistant solution is soaked and dried, and the plating assistant solution is required to be a zinc chloride solution with the concentration of 250-. After being soaked, the plating assistant solution is dried by hot air to ensure that the strip steel is dried;
(2) annealing and reducing the steel plate, wherein the temperature of 3 zones of an open fire section of the annealing furnace is controlled at 750 ℃, 800 ℃ and 850 ℃, the temperature of 4 zones of a reduction section is respectively 850 ℃, 800 ℃, 750 ℃ and 700 ℃, and the steel plate enters an alloy melting pot when the temperature of the steel plate is controlled at 460-480 ℃;
(3) the hot dip coating zinc-aluminum-magnesium alloy coating comprises 5.5-6% of aluminum, 3.0-5.0% of magnesium and the balance of zinc and trace elements in an alloy melting pot, and the temperature of the zinc-aluminum-magnesium alloy liquid is controlled at 450-460 ℃.
(4) And (3) after plating, after the alloy is taken out of the zinc melting pot, the air quantity of an air cooling fan is adjusted by using a variable frequency fan, and the temperature of the strip steel is controlled to be 90-110 ℃ when the strip steel is taken to a high tower steering roller. And then water cooling is realized by water quenching, and the surface temperature of the steel strip plate is reduced to between 35 and 45 ℃.
(5) And (3) finishing and straightening, wherein the alloy coating steel plate strip is subjected to air cooling and water cooling, then the yield platform in the steel plate is eliminated through finishing and straightening, the shape control of the steel plate is realized, the rolling force during finishing is generally controlled between 50 tons and 300 tons, and the straightening elongation is 0.01 percent to 0.03 percent.
The invention achieves good effect. Mainly expressed in the following aspects.
1. According to the invention, by improving the roughness of the surface of the steel strip, the alloy liquid can be in contact with the surface of the steel plate in a larger area in the process of plating the steel plate, so that the alloy liquid and the steel plate are better integrated, the bonding strength of the alloy layer and the steel plate in the plating process is effectively improved, and the risk of coating falling or cracking in the deep drawing or bending process of a product is avoided.
2. The whole process section has no pickling link, water and steel shots are recycled under high pressure, and oxide skin and crushed steel shot powder are used as iron ore concentrate for recycling in steel mills, so that the zero discharge standard of waste water, waste gas and solid waste is achieved. The whole process flow is pollution-free and environment-friendly.
Detailed Description
An equipment and a process for preparing a steel strip of a hot-dip galvanized aluminum-magnesium alloy on the acid-free ecological descaling rust surface of a steel strip remove the surface oxide skin of the hot steel strip through a front acid-free descaling rust equipment and adjust the surface roughness of a substrate strip so as to achieve the aim of adjusting the thickness and the adhesive force of a zinc-aluminum-magnesium coating.
The invention is further illustrated below in connection with the tests.
Test example 1
The raw materials used in the test are Q235B rolled plates with the plate width of 800mm and the thickness of 4.50mm, wherein:
1. the descaling treatment of the rolled plate specifically comprises the following steps:
(1) selecting high-strength alloy angular steel shots with the sizes of 0.6mm and 0.45mm and the hardness of 60HRC in the acid-free descaling rough spraying section 1 and the rough spraying section 2 respectively;
(2) the sand feeding amount of each nozzle of the rough spraying 1 section and the rough spraying 2 section is 5Kg/min, and the high pressure water pressure is 50 MP;
(3) the fine spray 1 section and the fine spray 2 section are respectively made of 304 stainless steel round pills with Rockwell hardness of 40-45HRC, which are 0.3mm and 0.2 mm;
(4) the sand feeding amount of each nozzle of the fine spray 1 section and the fine spray 2 section is 8Kg/min, and the high-pressure water pressure is respectively adjusted to 30MP and 40 MP.
(5) The descaling rust process speed is controlled at 30m/min.
Scale and rust removal results: the surface of the plate strip is clean and free of residues such as oxide scale and the like, and the roughness test result of the surface of the plate strip is RA 5.0-RA 5.5.
2. And (3) hot dip coating, further cleaning the steel plate surface subjected to shot blasting treatment by adopting a polyamide fiber nylon brush roller to ensure that the cleanliness of the steel plate surface is 200mmg/m2, and then performing the following treatment:
(1) soaking and drying the plating assistant solution, wherein the plating assistant solution is required to be a zinc chloride solution with the concentration of 300g, and drying by hot air after soaking;
(2) annealing and reducing the steel plate, wherein the temperature of 3 zones of an open fire section of the annealing furnace is controlled at 750 ℃, 800 ℃ and 850 ℃, the temperature of 4 zones of a reduction section is respectively 850 ℃, 800 ℃, 750 ℃ and 700 ℃, and the steel plate enters an alloy melting pot when the temperature of the steel plate is controlled at 460 ℃;
(3) the zinc-aluminum-magnesium alloy coating is hot-dip coated, the components in the alloy melting pot are 5.5 percent of aluminum and 5.0 percent of magnesium, the balance is zinc and trace elements, and the temperature of the zinc-aluminum-magnesium alloy liquid is controlled at 460 ℃.
(4) And (4) after plating, after the alloy is discharged from the zinc melting pot, the air quantity of an air cooling fan is adjusted by using a variable frequency fan, and the temperature of the strip steel is controlled at 100 ℃ when the strip steel is taken to a high tower steering roller. And then water cooling is realized by water quenching, and the surface temperature of the steel strip plate is reduced to 40 ℃.
(5) And (3) finishing, straightening, wherein the alloy coating steel plate strip is finished after air cooling and water cooling, the rolling force is controlled to be 100 tons, and the straightening elongation is 0.02%.
The hot galvanizing aluminum magnesium result is as follows: the surface roughness of the plating layer with the thickness of 24-28um is RA3.2-RA 3.5. The board surface is uniform and fine as seen by naked eyes, and the hand touch feeling has frosted feeling.
Claims (1)
1. A method for manufacturing a zinc-aluminum-magnesium alloy coating steel plate is characterized by comprising the following two steps:
1) the method comprises the following steps of (1) performing shot blasting descaling by using a high-pressure water nozzle, and blasting and striking high-pressure water solid-liquid two-phase flow containing a certain amount of steel shots on the surface of a hot steel strip by the high-pressure water nozzle, wherein the high-pressure water solid-liquid two-phase flow is divided into 4 high-pressure water shot blasting descaling sections including a rough blasting section 1, a rough blasting section 2, a fine blasting section 1 and a fine blasting section 2, wherein:
(1) the rough spraying 1 section is that high-strength alloy cast angular steel shots with the grain diameter of 0.7-0.5mm and the Rockwell hardness of 50-60HRC and water are fully mixed according to the volume ratio of 20-30:100, then the mixture of the mixed water and the steel shots is sprayed and impacted on the surface of the steel plate through high-pressure water nozzles, the spraying amount of each high-pressure water nozzle is 6-8Kg/min, the pressure of the mixture of the water and the steel shots sprayed by the high-pressure water nozzles is 30-50MP, and the time of the steel plate passing through the rough spraying 1 section is 4-6 minutes;
(2) the coarse spraying 2 section is that high-strength alloy cast angular steel shots with the grain diameter of 0.35-0.45mm and the Rockwell hardness of 50-60HRC and water are fully mixed according to the volume ratio of 25-30:100, then the mixture of the water and the steel shots formed by fully mixing the water and the steel shots is sprayed and hit on a steel plate through a high-pressure water nozzle, the spraying amount of each high-pressure water nozzle is 5-6Kg/min, the pressure of the mixture of the water and the steel shots sprayed by the high-pressure water nozzle is 40-50MP, and the time of the steel plate passing through the coarse spraying 2 section is 4-6 minutes;
(3) the fine spraying section 1 is to fully mix 304 stainless steel round balls with the grain diameter of 0.30-0.40mm and the Rockwell hardness of 45-50HRC and water according to the volume ratio of 20-30:100, then to spray and strike the mixture of water and steel balls formed by fully mixing the water and the steel balls onto a steel plate through a high-pressure water nozzle, the spraying amount of each high-pressure water nozzle is 8-10Kg/min, the pressure of the mixture of water and steel balls sprayed by the high-pressure water nozzle is 30-40MP, and the time of the steel plate passing through the fine spraying section 1 is 4-6 minutes;
(4) the fine spraying 2 section is that the 304 stainless steel round shot with the grain diameter of 0.20-0.30mm and the Rockwell hardness of 40-45HRC and water are fully mixed according to the volume ratio of 30:100, then the mixture of the water and the steel shot formed by fully mixing the water and the steel shot is sprayed and hit on the steel plate through the high-pressure water nozzles, the spraying amount of each high-pressure water nozzle is 8-10Kg/min, the pressure of the mixture of the water and the steel shot sprayed by the high-pressure water nozzles is 30-40MP, and the time of the steel plate passing through the fine spraying 2 section is 4-6 minutes;
2) and (3) hot dip coating, further cleaning the steel plate surface subjected to shot blasting treatment by adopting a polyamide fiber nylon brush roller to ensure that the surface cleanliness of the steel plate is 200mmg/m2The following is then performed:
(1) soaking and drying the plating assistant solution, wherein the plating assistant solution is required to be a zinc chloride solution with the concentration of 250-;
(2) annealing and reducing the steel plate, wherein the temperature of 3 zones of an open fire section of the annealing furnace is controlled at 750 ℃, 800 ℃ and 850 ℃, the temperature of 4 zones of a reduction section is respectively 850 ℃, 800 ℃, 750 ℃ and 700 ℃, and the steel plate enters an alloy melting pot when the temperature of the steel plate is controlled at 460-480 ℃;
(3) the hot dip coating zinc-aluminum-magnesium alloy coating comprises 5.5-6% of aluminum, 3.0-5.0% of magnesium and the balance of zinc and trace elements in an alloy melting pot, and the temperature of the zinc-aluminum-magnesium alloy liquid is controlled at 450-460 ℃;
(4) after plating, after the alloy is taken out of the zinc melting pot, the air quantity of an air cooling fan is adjusted by a variable frequency fan, the temperature of the strip is controlled between 90 ℃ and 110 ℃ when the strip is taken to a high tower steering roller, and water cooling is realized by water quenching, so that the surface temperature of the strip is reduced to between 35 ℃ and 45 ℃;
(5) and (3) finishing and straightening, wherein the alloy coating steel plate strip is subjected to air cooling and water cooling, then the yield platform in the steel plate is eliminated through finishing and straightening, the shape control of the steel plate is realized, the rolling force during finishing is generally controlled between 50 tons and 300 tons, and the straightening elongation is 0.01 percent to 0.03 percent.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116855866A (en) * | 2023-09-04 | 2023-10-10 | 扬州大发螺丝有限公司 | Intelligent equipment control process for hot-dip galvanizing of double-end stud without pickling |
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